Open Source Software Author Cto Jobs

Why Sony Interactive Entertainment? Sony Interactive Entertainment isn’t just the Best Place to Play — it’s also the Best Place to Work. Sony Interactive Entertainment (SIE) is the company behind the PlayStation brand. As a subsidiary of Sony Group Corporation, we’re part of a proud legacy of innovation and excellence. SIE is a dynamic technology company, delivering cutting-edge hardware and network services to more than 100 million people and an entertainment leader, home to some of the most beloved and recognizable intellectual properties (IP) in the world. Our role at SIE is to create and nurture the experiences under the PlayStation brand, a name synonymous with entertainment excellence and creativity. Key Responsibilities As a Software Engineer II - Kernel Security, your responsibilities will include: Build, develop, and maintain kernel security features for PlayStation systems. Collaborate with multi-functional teams to successfully implement security improvements. Debug and resolve sophisticated security issues within the kernel. Supervise and analyze security threats to determine the best course of action. Assist with open-source projects associated with kernel security. Maintain code quality through meticulous testing and code reviews. Requirements To be considered for this role, you must have: A bachelor’s degree in computer science, Engineering, or a related field, or equivalent experience. Proficiency in C programming languages, other programming language like C++ is a plus. Experience with kernel development, freeBSD knowledge is a plus. Knowledge in kernel security concepts and practices. Familiarity with version control systems, particularly Git and GitHub. Excellent debugging skills and problem-solving abilities. The ability to work autonomously and within a cooperative group. Preferred Qualifications The ideal candidate will also have: Advanced knowledge of operating systems and low-level programming. Experience contributing to widely recogniz

About Supabase Supabase is the Postgres development platform, built by developers for developers. We provide a complete backend solution including Database, Auth, Storage, Edge Functions, Realtime, and Vector Search. All services are deeply integrated and designed for growth. Compute is our newly launched microVM architecture for running agentic workloads, operating alongside our existing Edge Functions service for server-side TypeScript functions distributed globally at the edge. We want developers to be able to build truly global applications by distributing both compute and data globally. Infrastructure concerns like regions, cold starts, CPU and memory provisioning should fade into the background so developers can focus on iterating on business logic, and fast, flexible runtimes a growing range of agent-driven code. We are looking for experienced and passionate engineers to help us go further in this vision. What You’ll Own Help build & architect the Supabase Compute platform, built on Firecracker microVMs. Implementing monitoring, alerting, and OpenTelemetry tracing across the runtime, then using that visibility to drive optimizations that improve latency and reliability of the service. Working closely with the Firecracker, Deno, and other open-source teams, contributing to upstream and relaying our users' requirements. Participating in an on-call rotation to keep Compute healthy in production. Help manage and improve features like scheduled functions, background tasks, WebSockets streaming, ephemeral file storage, and custom routing. Integrating Compute more tightly with the rest of the Supabase stack — Auth, Postgres, Storage, and Realtime. Expanding the Compute runtime to support more use cases (AI inference, MCP servers, hosting simple websites, URL shorteners). Improving the DX of developing and debugging Compute locally through the Supabase CLI, including DevTools integration, logging, and production parity. What You’ll Bring At least 5 years of backe

ABOUT BASETEN Baseten powers mission-critical inference for the world's most dynamic AI companies, like Cursor, Notion, OpenEvidence, Abridge, Clay, Gamma, and Writer. By uniting applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing quickly and recently raised our $1.5B Series F , led by Altimeter Capital, Conviction Partners, and Spark Capital. Join us and help build the platform engineers turn to ship AI products. THE ROLE Voice is becoming the internet’s next interface, but a production-grade Voice AI system is "hard to build" . You’ll join a small founding team of Baseten Voice AI, focused on bringing state-of-the-art open source models into production for Voice AI customers across productivity, customer service, clinical conversation, creator tools, education, and more. You’ll make a meaningful impact on people’s daily lives and help reshape these industries. This is a high-impact, high-ownership role. You will be the primary owner of Baseten Voice AI - our in-house inference stack to power Voice AI models - from product roadmap through engineering implementation. You’ll partner closely with Forward Deployed Engineers, Model Performance Engineers, and sister engineering teams to push the boundaries of Voice AI. EXAMPLE INITIATIVES Develop world-class model serving stack for state-of-the-art open-source voice models - reduce end-to-end and tail latency (p95/p99), increase throughput, and improve GPU efficiency via profiling, runtime tuning, and server-level optimizations. Build large-scale, real-time infrastructure for multi-model voice agents - orchestrate STT, TTS, and agent components with streaming I/O to meet customer SLOs. Design tight training and inference iteration loops for voice model customization - enable fast evaluation, safe rollout, and rapid experimentation for custom voice model development. Past projects: Base

About the Team The Codex Core Agent team builds the kernel of Codex. We own making the agent better, accelerating research, and making those improvements real in production for our users. That means working across the systems that make Codex actually function as an agent in the real world: the production performance envelope around tokens, latency, reliability, cost, and capacity; the core execution loop and interfaces that turn models into useful behavior; the shared infrastructure that enables other teams to build on Codex; and the feedback loops that turn real-world usage into better models and better agent behavior over time. About the Role We’re looking for engineers to build the infrastructure that powers Codex agents in production. This role focuses on the systems that let models safely execute code, interact with tools, complete long-running tasks, and operate reliably and efficiently at scale. You’ll design and operate the infrastructure behind sandboxed execution, orchestration, stateful workflows, app-server and SDK boundaries, and model rollouts. You’ll work at the intersection of distributed systems, developer tooling, and AI, building primitives that make Codex faster, safer, more reliable, and easier for the rest of the organization to build on. What You’ll Do Design and build execution environments for AI agents, including sandboxing, isolation, and reproducibility. Develop systems for agent orchestration across multi-step, tool-using workflows. Build infrastructure for running, testing, and debugging code generated by models. Create state and memory systems that allow agents to persist context across long-running tasks. Optimize tokens, latency, reliability, and cost across Codex’s production fleet. Support model rollouts, capacity planning, and the core tradeoffs between quality, speed, and economics to manage a fleet of frontier agents at scale. Build shared platform capabilities that unblock product teams, partner teams, and open source Codex. Yo

About the Team OpenAI’s mission is to ensure that artificial general intelligence benefits all of humanity. A majority of our users interact with our products in languages other than English, and our products must work seamlessly across languages, regions, and cultures. The Internationalization team builds the infrastructure that enables OpenAI products to ship globally by default. We develop the systems that power localization, international product launches, and high-quality global user experiences across all OpenAI products. About the Role As a Senior Software Engineer on the Internationalization team, you will build the systems that power localization and international product launches at OpenAI. You’ll work on the platform that manages product content, translation workflows, and localization infrastructure across our products. This role sits at the intersection of AI systems, developer platforms, and product infrastructure. In this role, you will Build and scale OpenAI’s localization, content, and experimentation platform used across OpenAI product teams, including open-source components: Develop AI-powered translation pipelines combined with human-in-the-loop review workflows. Design systems that reliably deliver localized product content across web and mobile apps. Build tools that enable linguists and localization teams to review and improve translations. Develop developer tooling that simplifies localization and internationalization workflows. Build and maintain internationalization libraries used across OpenAI products: Design systems that correctly handle numbers, currencies, dates, and pluralization across locales. Improve support for multilingual interfaces and right-to-left languages. Partner with product teams to improve the international readiness of new features. You might thrive in this role if you Have strong software engineering experience building backend or full-stack systems. Have familiarity with Java, React, MySQL, and cloud infrastructure p

ABOUT BASETEN Baseten powers mission-critical inference for the world's most dynamic AI companies, like Cursor, Notion, OpenEvidence, Abridge, Clay, Gamma, and Writer. By uniting applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing quickly and recently raised our $1.5B Series F , led by Altimeter Capital, Conviction Partners, and Spark Capital. Join us and help build the platform engineers turn to ship AI products. THE ROLE We are looking for Software Engineers to join our team. This is a specialized, high-impact role sitting at the intersection of high-performance computing (HPC) and Large Language Model (LLM) engineering. You will not just be building the automated "speedometer and diagnostic" suite for our next-generation AI infrastructure; you will be defining the roadmap, driving key technical decisions, and taking full ownership of the future of this work. RESPONSIBILITIES Benchmarking : Evaluate, run and automate standard LLM quality benchmarks (GSM8K, MMLU) alongside custom performance suites for specific workloads (e.g., long-context window, KV cache reuse, disaggregated serving). DevEx Improvement : Develop and maintain internal GPU-enabled development environments (similar to GitHub Codespaces). You will ensure the team has seamless, high-performance "dev machines" optimized for model experimentation. Tool Development : Build and contribute to open-source tools such as InferenceMAX and genai-bench to automate model evaluation, benchmarking and analysis. System Profiling : Use profilers like PyTorch Profiler, NVIDIA Nsight Systems and py-spy to collect performance profiles, identify bottlenecks, and debug the compute/networking stack. Monitoring & Observability : Develop real-time dashboards and alerts to monitor system health, model startup times, and runtime performance. Continuous Integration : Automate performance

ABOUT BASETEN Baseten powers mission-critical inference for the world's most dynamic AI companies, like Cursor, Notion, OpenEvidence, Abridge, Clay, Gamma and Writer. By uniting applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing quickly and recently raised our $1.5B Series F , led by Altimeter Capital, Conviction Partners, and Spark Capital. Join us and help build the platform engineers turn to to ship AI products. THE ROLE Are you passionate about advancing the application of artificial intelligence? We are looking for a Software Engineer focused on ML performance to join our dynamic team. This role is ideal for someone who thrives in a fast-paced startup environment and is eager to make significant contributions to the exciting field of LLM Inference. If you are a backend engineer who thrives on making things faster and is excited about open-source ML models, we look forward to your application. EXAMPLE INITIATIVES You'll get to work on these types of projects as part of our Model Performance team: Baseten Embeddings Inference: The fastest embeddings solution available The Baseten Inference Stack Driving model performance optimization RESPONSIBILITIES Implement, refine, and productionize cutting-edge techniques (quantization, speculative decoding, kv cache reuse, chunked prefill and LoRA) for ML model inference and infrastructure. Deep dive into underlying codebases of TensorRT, PyTorch, TensorRT-LLM, vllm, sglang, CUDA, and other libraries to debug ML performance issues. Apply and scale optimization techniques across a wide range of ML models, particularly large language models. Collaborate with a diverse team to design and implement innovative solutions. Own projects from idea to production. REQUIREMENTS Bachelor's, Master's, or Ph.D. degree in Computer Science, Engineering, Mathematics, or related field. Experience with one

A World-Changing Company Palantir builds the world’s leading software for data-driven decisions and operations. By bringing the right data to the people who need it, our platforms empower our partners to develop lifesaving drugs, forecast supply chain disruptions, locate missing children, and more. The Role Are you passionate about engineering quality, efficiency, and increasing the impact of engineers around you? Software Engineers at Palantir build software that transforms how the world’s most important organizations use data. As an engineer focused on Frontend Developer Productivity, you’ll work within our Frontend Infrastructure group to identify, develop, and drive investments to improve the velocity and quality of our engineering. Our frontend infrastructure group covers our entire frontend development stack, from the developer experience in the IDE to the final user experience in the browser. Across the group, we are responsible for developing and maintaining: • The build and CI system for a large frontend monorepo with millions of lines of code and hundreds of active developers. • Core infrastructure required to develop and serve our frontends, including feature flags, internationalization, and commit previews. • A GraphQL API for declarative data loading, spanning many underlying services. • Blueprint, the open source UI framework used by all of Palantir's applications and thousands of developers around the world. • A variety of tools and VSCode extensions that improve developer experience across the company. With an ambitious roadmap ahead of us, you'll have the opportunity to make a lasting difference on application development at Palantir. Core Responsibilities Design tools and infrastructure that make it easy for developers to build performant applications. Identify the most pressing issues affecting our frontend developers and advocate for potential solutions. Extend our Gradle-based build tooling to decrease build

For over 20 years, Smartsheet has empowered teams to manage work seamlessly and scale solutions smarter. Now, in our most ambitious chapter yet, we are uniting human teams with AI agents. By orchestrating the work agents do best, automating manual tasks and uncovering insights at scale, we create the space for people to focus on what truly matters: judgment, creativity, and big thinking. That is magic at work, and it’s what we show up for every day. Our India Global Capability Center isn't just supporting global operations—we’re leading global innovation. After scaling rapidly into a best-in-class hub, we deliver the product innovation and enterprise capabilities that accelerate our global growth, profitability, and scale. As we expand Smartsheet India, we’re searching for Senior Software Engineers who crave variety and ownership. Whether your expertise is in front-end, back-end, test automation, ops, or infrastructure, you’ll have the opportunity to work across multiple teams and disciplines, building a versatile skillset while solving the complex challenges of a global platform. You Will: Work on all areas of the software from front end, back end, cloud infrastructure and test automation. Drive high standards within the team for all internal services and open source tooling/libraries we maintain. Deploy service and infrastructure changes frequently in a lean agile environment using full CI/CD. Contribute in all aspects of product development: idea generation, customer engagement, planning, design, prototyping, execution, shipping, and operational excellence. Collaborate with a team of passionate, engaged engineers, and with cross-functional teams that include product managers, UX designers, UX researchers, and more. Actively mentor more junior engineers, showing how to balance customer delivery while holding high coding, service, and cloud infrastructure standards. Apply different approaches to problem solving and help validate your ideas and those of

We are a global team of innovators and pioneers dedicated to shaping the future of observability. At New Relic, we build an intelligent platform that empowers companies to thrive in an AI-first world by giving them unparalleled insight into their complex systems. As we continue to expand our global footprint, we're looking for passionate people to join our mission. If you're ready to help the world's best companies optimize their digital applications, we invite you to explore a career with us! Do you get excited about complex distributed systems? Do you love data? We’re looking for an experienced technology leader to lead and grow our global engineering team and help our customers build better software by building the next generation of Application Performance Monitoring (APM) by leading our Agent teams. New Relic is committed to giving our customers valuable insights into their systems, and New Relic’s APM agents are used by tens of thousands of companies to evaluate and improve the performance of their most important business applications. Opportunity to work from a remote office may be available depending on the applicant's location. What you'll do Hands on with data analysis and technical problem solving Leverage open source tools like OpenTelemetry to acquire data Help design and build our APM agents that run in our customer environments and give engineers deep insight into application performance, and business line owners actionable intelligence on their business performance Build processes that ensure reliability, scalability, team growth and execution Work across teams to build engineering plans and execute, getting things done in a distributed, large-scale, and fast-growing environment This role requires 4+ years of experience leading people and teams 10+ years of experience in Software Engineering Proven track record of leading and scaling strong technical teams Experience handling high performing self-directed remote teams Capable of div

Figma is growing our team of passionate creatives and builders on a mission to make design accessible to all. Figma’s platform helps teams bring ideas to life—whether you're brainstorming, creating a prototype, translating designs into code, or iterating with AI. From idea to product, Figma empowers teams to streamline workflows, move faster, and work together in real time from anywhere in the world. If you're excited to shape the future of design and collaboration, join us! We’re looking for an Engineering Manager to join the Developer Tools team at Figma. This team is building solutions targeting mainly frontend and full stack developers, helping them bring products from idea to production faster than ever. As a manager on the Developer tools team you will lead teams working across Dev Mode, MCP, Code Connect, and more. You’ll also be responsible for helping define the future of our developer offering, very likely helping incubate and lead new product development. Developer tools is a major initiative at Figma and is spearheaded from the London office. You’ll be working on one of the most exciting areas within Figma incorporating design thinking, the latest AI developments, and open source developer tooling. This is a full time role that can be held from our London hub or remotely in the UK. What you’ll do at Figma: Manage and support a team of product engineers focused on building and expanding Figma’s developer offerings, including Dev Mode, MCP, Code Connect, and more Partner closely with cross-functional stakeholders to coordinate work across product, design, engineering, and other functions Define strategy & roadmap for your team and execute on that roadmap with a high degree of autonomy, velocity, and craftsmanship Provide hands-on technical leadership to your teams and others that collaborate with your teams to ensure a cohesive product experience and the right technical abstractions Recruit, mentor, and retain high performing engineers (and help with o

For over 20 years, Smartsheet has empowered teams to manage work seamlessly and scale solutions smarter. Now, in our most ambitious chapter yet, we are uniting human teams with AI agents. By orchestrating the work agents do best, automating manual tasks and uncovering insights at scale, we create the space for people to focus on what truly matters: judgment, creativity, and big thinking. That is magic at work, and it’s what we show up for every day. Smartsheet is a tech company with a human story to tell. We’re here to empower teams to manage projects, automate workflows, and rapidly build new secure solutions, using simple no-code tools. We’re revolutionaries – so for us changing the way the world works is all in a day’s work. As a global leader in Intelligent Work Management with a market cap of $10bn, we’ve continued to scale our engineering presence internationally. Since expanding into Bulgaria in October 2024, we’ve grown to a team of 75+ engineers. As we continue building this operation, we’re looking for a talented and motivated Senior Software Engineer who are passionate about continuous learning and excited to grow in a fast-paced, innovative environment. Smartsheet runs on a modern SaaS stack hosted on AWS, with infrastructure defined and managed as code using Terraform and strong engineering best practices. Our core platform includes a legacy Java monolith alongside a growing ecosystem of microservices, primarily built in Java and Go (with a small number of Kotlin services). On the front end, product teams that deliver UI experiences use React. You will work remotely from Bulgaria and will be reporting to an engineering leader. You Will: Work on all aspects of software development, including back-end, front-end, cloud infrastructure, and test automation. Drive high standards for internal services and open-source tools, ensuring reliability and scalability. Deploy services and infrastructure changes frequently in an agile environment using full CI/C

Every day, tens of millions of people come to Roblox to explore, create, play, learn, and connect with friends in 3D immersive digital experiences– all created by our global community of developers and creators. At Roblox, we’re building the tools and platform that empower our community to bring any experience that they can imagine to life. Our vision is to reimagine the way people come together, from anywhere in the world, and on any device. We’re on a mission to connect a billion people with optimism and civility, and looking for amazing talent to help us get there. A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safer, more civil shared experiences for everyone. Senior Director, Generative AI About the Role Roblox Build is our generative creation product, the platform where creators design, build, and publish 3D experiences. We are looking for a Senior Director of Generative AI to lead the Applied AI organization inside Build, responsible for turning state-of-the-art foundation models into high-quality, reliable creation systems at Roblox scale. This leader will own the full applied AI stack: model strategy and routing, model adaptation and fine-tuning, code generation (CodeGen), 3D layout generation (LayoutGen), and the evaluation science and infrastructure that tells us what actually works. You Will Own model strategy and routing for Build. Design and build an intelligent model layer that selects the right model for each creation task based on quality, capability, latency, cost, and safety, leveraging both frontier models and Roblox-adapted open-source models. Lead model adaptation across the Applied AI org, including fine-tuning, distillation, synthetic data generation, human feedback pipelines, and preference optimization for Roblox-specific creation tasks such as Luau code generation and 3D scene understanding. Drive CodeGen capabilities

EnCharge AI is a leader in advanced AI hardware and software systems for edge-to-cloud computing. EnCharge’s robust and scalable next-generation in-memory computing technology provides orders-of-magnitude higher compute efficiency and density compared to today’s best-in-class solutions. The high-performance architecture is coupled with seamless software integration and will enable the immense potential of AI to be accessible in power, energy, and space constrained applications. EnCharge AI launched in 2022 and is led by veteran technologists with backgrounds in semiconductor design and AI systems. About the Role EnCharge AI is seeking a highly skilled Device Driver Engineer to design and implement high-performance driver stack for our cutting-edge AI accelerator hardware. In this role, you will work closely with hardware, firmware, and AI software teams to develop low-latency, high-bandwidth communication between the host system and AI accelerator. Responsibilities Develop, optimize, and maintain Linux/Windows PCIe device drivers for AI accelerators. Implement low-level hardware interactions, DMA, memory management, and interrupt handling. Work on driver optimizations to reduce latency and improve throughput for AI workloads. Debug and troubleshoot PCIe protocol, kernel panics, crashes, and performance bottlenecks. Collaborate with hardware, firmware, and AI software teams to define driver interfaces. Ensure compliance with PCIe standards (Gen4/Gen5), SR-IOV, BAR memory mapping, and IOMMU. Support virtualization (VFIO, SR-IOV, DPUs) and containerized environments (Kubernetes, Docker, etc.). Develop tools for profiling, debugging, and monitoring driver performance. Contribute to open-source kernel modules if applicable. Qualifications Bachelor’s or Master’s degree in Computer Science, Electrical Engineering, or a related field. 3+ years of experience in device driver development for Linux and/or Windows. Strong experience with PCIe-based hardware, including BAR

Modern software runs on open source, and managing the compliance, security, and regulatory complexity that comes with it is one of the biggest problems facing engineering and legal teams today. FOSSA is the platform they use to address these challenges. We help thousands of organizations automate license compliance, prioritize vulnerabilities, generate and operationalize SBOMs, and meet regulatory requirements. Whether it's scanning AI-generated code for IP risks or helping a company through M&A due diligence, FOSSA gives teams the confidence to ship software they trust. FOSSA is a rapidly growing series-B company with a truly distributed team. While our roots are in San Francisco, our growing team has members in several countries across many time zones. We’re always working to find the perfect balance of effective approaches to distributed work, while maintaining the direct personal connections that help us work better together and love our jobs. Your Mission: We are looking to hire a strategic, customer-focused, and results-driven Sr. Sales Engineer who can come in to support the growth in our enterprise market. This is a chance to help shape the strategic growth of a true game-changer with a highly differentiated product! In the role you will: Articulate technology and product positioning to both business and technical users. Support our Enterprise Account Executives by carrying out product demos and building business value cases with clients. Manage complex sales engagements with touch points in Legal, Engineering, and Security. Lead and execute on RFPs, RFIs, POCs and Demos Think outside the box, and lead strategic initiatives to improve the customer experience with FOSSA. Articulate and evangelize FOSSA with end users, top industry partners, and key thought leaders. Engage new and existing accounts to identify and build relationships with champions and decision makers. Help build and be a part of an awesome culture. About you: 3-5 years Sales E