Lead Software Engineer Application Platform Jobs

For more than 30 years, SonicWall has delivered a partner-first unified cybersecurity portfolio that helps SMBs, MSPs, and IT teams consolidate network security, endpoint security, security service edge (SSE), and threat response across hybrid environments. By bringing connected technology, real-time threat intelligence, automation, and expert services together, SonicWall helps organizations simplify security operations, achieve better security outcomes, and lower total cost of ownership. Backed by a global ecosystem of more than 17,000 partners, SonicWall delivers enterprise-grade protection built for SMB and mid-market realities. For more information, visit www.sonicwall.com or follow us on X, LinkedIn , Facebook , and Instagram . About the Role SonicWall is seeking a Senior Software Engineer with deep IPv6 expertise to lead the design, implementation, and hardening of IPv6 capabilities across the Sonicwall firewall firmware stack. As a Principal Engineer, you will be the technical authority for IPv6 feature parity, protocol correctness, and interoperability across SonicWall Next-Generation Firewall (NGFW) platforms. This role is ideal for engineers with hands-on experience delivering IPv6 in high-performance router, switch, or carrier-grade networking products who are looking to apply that expertise in the embedded network security domain. Responsibilities Lead IPv6 Architecture & Feature Delivery — Own end-to-end design and implementation of IPv6 features across the Sonicwall frewall networking stack, including IPv6 routing, interface addressing, DHCPv6, NDP, MLDv2, and IPv6 Policy-Based Routing (PBR). Drive IPv6 Feature Parity — Identify and close gaps between IPv4 and IPv6 feature sets across subsystems — including VPN Tunnel Interfaces, IPsec/IKEv2, SSL-VPN, Syslog, SNMP, and NAT64 — ensuring consistent dual-stack and IPv6-only operation. Design High-Performance IPv6 Packet Processing Paths — Architect and optimize the IPv6 datapl

Why Harvey At Harvey, we’re transforming how legal and professional services operate. By combining frontier agentic AI, an enterprise-grade platform, and deep domain expertise, we’re reshaping how critical knowledge work gets done for decades to come. This is a rare chance to help build a generational company at a true inflection point. We have strong product-market fit and world-class investor support. We’re scaling fast and defining a new category in real time. The work is ambitious, the bar is high, and the opportunity for growth — personal, professional, and financial — is unmatched. Our team moves fast, takes ownership, and is deeply committed to the mission — operating with intensity, staying close to our customers, and pushing each other for excellence. We live by three values: Decisiveness, Simplicity, and Job's Not Finished. We act quickly on clear judgment over perfect information, we believe simplicity is what scales, and we're never satisfied with where we are. If you want to do the best work of your career alongside people who share that drive, we'd love to build with you. At Harvey, the future of professional services is being written today — and we’re just getting started. Role Overview As a Staff Software Engineer on the Model Infrastructure team, you'll lead the design and development of the systems that power every AI request at Harvey. You'll partner closely with AI Research, Product Engineering, Infrastructure, and external model providers to build a platform that is highly reliable, scalable, observable, and efficient. What You’ll Do Lead the design and implementation of Harvey's Model Infrastructure platform. Build systems to ensure high availability, low latency, and operational excellence for AI inference. Design and improve Harvey's Unified Model Controller (UMC) and Model Selector platform to automatically detect model degradations and intelligently route traffic based on reliability, latency, quality, compliance, and cost. Develop systems

Reddit is a community of communities. It’s built on shared interests, passion, and trust, and is home to the most open and authentic conversations on the internet. Every day, Reddit users submit, vote, and comment on the topics they care most about. With 100,000+ active communities and approximately 130 million daily active unique visitors, Reddit is one of the internet’s largest sources of information. For more information, visit www.redditinc.com . Reddit is a platform built on creativity, and our users are constantly finding new ways to make it their own. Tens of thousands of external developers are already building apps on Reddit, and we’re just getting started. We’re looking for a Staff Software Engineer to help shape the future of our developer platform. You’ll work across frontend, backend, SDKs, platform, and full-stack systems to make it easier for developers to build useful, creative, and delightful apps on Reddit. You’ll help define the technical direction of the platform, lead important initiatives, and build the foundation for new developer experiences. You’ll work closely with engineers, product managers, designers, and other teams to solve complex problems and turn ambitious ideas into real products. This is a very hands-on role. We collaborate closely with Redditors and reddit.com regularly. If you enjoy building new things, working across technical boundaries, and making delightful experiences for developers, we’d love to hear from you. What You’ll Be Working On Designing and implementing platform features, making the developer platform easier, faster, and more powerful to build on Leading major technical initiatives from early exploration through launch Building the systems and tools that support future developer experiences Working across backend, infrastructure, client, and full-stack components Helping create a collaborative team with a strong sense of ownership Who You Might Be 6+ years of industry experience working on platform functionality,

Ready to do the most impactful work of your career? At Coinbase , we are uncompromising on our mission to increase economic freedom. The bar is high, the environment is intense, and we like it that way. This isn't a place for complacency, it’s a place to be pushed past your perceived limits. If you're ready to build the future of finance alongside people who refuse to settle for "good enough," you belong here. Coinbase is a remote-first, but not remote-only company. Expect to get together quarterly for intense in-person working sessions called “surges.” learn more about working at Coinbase . Coinbase is building the future of regulated derivatives as part of the Institutional Everything Exchange, and Coinbase Financial Markets (CFM) is our CFTC-regulated Futures Commission Merchant - the entity that lets retail and institutional clients trade and clear US futures and options. As a Staff Software Engineer on the FCM team, you'll be a hands-on technical anchor across the entire FCM lifecycle: market data, order entry and routing, settlement and money movement, back office reporting, and our in-house risk and liquidation system. You'll help lead a major replatforming onto next-gen architecture and reduce legacy vendor dependencies, a rare chance to re-architect a regulated trading platform from the inside, with the ownership of a startup and the reach of Coinbase. What you’ll do: Own design and architecture across the FCM core, from market data and order routing through settlement, reporting, and risk. Drive the next-gen replatforming and reduce legacy vendor dependencies while raising stability and reliability. Set the technical bar through code, design reviews, and standards, and pay down the technical debt that matters most. Partner across pods (execution, risk, lifecycle) and cross-functionally with Product, CFM Risk and Ops, Finance, and Compliance to deliver correct, auditable systems and turn strategy into a roadmap. Mentor engineers acro

Lithic is the modern card issuing and processing platform empowering ambitious financial companies to build the future of payments. Our infrastructure powers card programs for 100+ innovative clients, from fintechs reimagining credit and digital banking to platforms transforming disbursements and spend management. Companies like Mercury, Flex, and Novo rely on Lithic's developer-friendly APIs, direct network connections, and flawless reconciliation to launch and scale card programs in weeks, not years. We're building a future where access to better financial products materially improves people's lives, free from the constraints of 30-year-old mainframes and legacy processors. We're proud to be backed by world-class investors who share that vision, including Bessemer Venture Partners, Index Ventures, Spark Capital, Stripes, and Mastercard, along with many others. We're a team of 170+ across 26 states and 7 countries, headquartered in New York City. We are hiring a Senior Software Engineer for the Product Platform team, which owns the foundational layer of our API that all other Lithic products build on top. The team’s mission is to make Lithic's API the best in fintech — reliable, consistent, and a joy to integrate with. This includes API Gateway, Events Platform, API key management and authorization, audit logging, or API norms and versioning strategy. What you'll do: Write reliable, secure, and scalable code for Lithic's product platform with minimal tech debt Improve the reliability of systems in team’s scope and participate in the team on-call rotation Own projects from planning to launch, spanning areas like API key management, reliability, audit logging, or search, keeping stakeholders informed and aligned along the way Lead efforts to improve systems and processes within the team What you'll bring: 4+ years building production backend systems, ideally including public-facing APIs at scale Experience in or desire to learn Rust; ability to understand

Ready to do the most impactful work of your career? At Coinbase , we are uncompromising on our mission to increase economic freedom. The bar is high, the environment is intense, and we like it that way. This isn't a place for complacency, it’s a place to be pushed past your perceived limits. If you're ready to build the future of finance alongside people who refuse to settle for "good enough," you belong here. Coinbase is a remote-first, but not remote-only company. Expect to get together quarterly for intense in-person working sessions called “surges.” learn more about working at Coinbase . Ready to do the most impactful work of your career? At Coinbase , we are uncompromising on our mission to increase economic freedom. The bar is high, the environment is intense, and we like it that way. This isn't a place for complacency, it’s a place to be pushed past your perceived limits. If you're ready to build the future of finance alongside people who refuse to settle for "good enough," you belong here. Coinbase is a remote-first, but not remote-only company. Expect to get together quarterly for intense in-person working sessions called “surges.” learn more about working at Coinbase . Agent Verification builds systems that help Coinbase safely ship software in an AI-native development environment. The team develops automated code review, risk and policy evaluation, CI evidence, and merge controls that reduce routine manual work while preserving human judgment for higher-risk changes. As a Senior Software Engineer, you will design and build reliable backend services and integrations across source control, CI/CD, policy systems, and developer workflows. You will lead the adoption of a consistent and observable merge path, partner with Security, Compliance, Infrastructure, and product engineering teams, and improve how software changes are reviewed and shipped across Coinbase. We are looking for an experienced backend or platform engineer who has built distribute

Who we are About Stripe Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. About the team Money Movement teams are crucial in helping Stripe build platforms and product experiences that enables businesses all over the world to move money. We are currently looking for someone who can drive the technical vision for how Stripe moves money at a global scale. This role spans the stack, from the core financial APIs that all of Stripe’s products are built on, like balances, transfers and payouts, to the financial integrations we rely on to move billions of dollars in countries around the world. The teams also run infrastructure that abstracts payment networks globally to expose capabilities for moving money with a variety of characteristics like speed, currency, and cost. We are responsible for ensuring that money gets to its destination quickly, reliably and in a cost effective manner. These systems are extremely central to our plans for the next 5-10 years and building them well will have an enormous impact on Stripe. What you'll do Help define and lead the technical roadmap for Money Movement. Ensure our infrastructure is safely extensible, scalable, reliable and meets SLAs for both external and internal users. Shape future proof interfaces that are easy to build against and meet the requirements of product teams. Help drive sound technical decision making within Money Movement and lead technical conversations with other teams across Payments Infrastructure and Stripe. Run, design, and code review for key components and ships in Mone

What We Do: Cybercrime is growing, and more businesses are getting hit by threats that used to target only the biggest organizations. That pushes defenders like us to operate at the highest level, and it deepens our need for good people who want to make a meaningful impact. Founded in 2015 by former NSA cyber operators, Huntress is a remote-first team working to make enterprise-grade cybersecurity accessible to businesses of all sizes. We work closely with security teams and service providers protecting complex environments, often without the time or headcount to handle it all. That’s why we build our technology in-house and back it with a 24/7 human-led Security Operations Center (SOC). As a result, our platform is never disconnected from the experts who manage it, ensuring our customers' protection. Huntress now secures more than 5M endpoints and 16M identities worldwide. Those numbers keep growing because more businesses rely on us to help carry the load and operate with more confidence. Every day, you can see that commitment in how we stand with our customers and how we show up for each other. Reports to: Engineering Manager Location: Remote US Compensation Range: $200,000 - $220,000 base plus bonus and equity About the Team Huntress protects the small and mid-sized businesses that attackers assume can't afford a security team. The Detection Platform team builds the engines and pipelines that turn billions of raw telemetry events into the signals our 24/7 SOC acts on. Every detection Huntress ships, across endpoint, identity, SIEM, and third-party EDR, runs through systems this team owns. We measure ourselves on two things: time to detection and detection engine uptime. About the Role We're hiring a Staff Software Engineer to help build and rebuild these systems without disrupting the SOC that depends on them, and to make their behavior predictable under load. This is a hands-on technical leadership role: you'll lead major workstreams, set direction that other e

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. Department overview: We are establishing and growing a new engineering team in Dublin that contributes to the client technologies powering PlayStation experiences used by millions of players worldwide. Our team develops SDKs, middleware, and platform technologies that enable scalable and reliable experiences across the PlayStation ecosystem. While our primary focus today is SDK and platform development, the team is expected to evolve alongside business and product needs, creating opportunities to work across multiple technical domains. As an early member of the team, you will help shape the technologies we build, the engineering practices we follow, and the future direction of a growing organization while collaborating closely with teams in Tokyo and across the globe. What you’ll be doing: Design, develop, test, and maintain client-side SDKs, middleware, and system software primarily using C/C++ Lead technical design discussions and drive architecture decisions for SDK and platform capabilities Design clean, scalable, and maintainable APIs that simplify integration and improve developer experience Analyze product requirements and translate them into robust technical designs and implementation plans Own complex features from design through delivery, ensuring qualit

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. Staff Software Engineer, Adaptive Experiences Platform Waterloo, ON About the Role The DTIS organization is building the next generation of adaptive experiences for PlayStation. Our vision is to make every customer touchpoint more relevant, useful, and joyful by combining reusable experience capabilities with personalization, merchandising, experimentation, and intelligent decisioning. We are looking for a Staff Software Engineer to help lead the evolution of our Dynamic Experience Management platform, allowing teams to create and optimize experiences without requiring bespoke implementation for every client, iterating rapidly. You will be a hands-on technical leader working across the experience stack. You will also shape the architecture needed to extend capabilities beyond PS5, across web, mobile, and other PlayStation devices. This is an opportunity to define foundational technology that will change how PlayStation builds, delivers, experiments with, and learns from customer experiences at scale. Responsibilities Define and drive the technical direction for our experiences client SDK, translating the adaptive-experiences vision into an incremental, production-ready architecture. Design and evolve the platform-independent composition layer, public TypeScr

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. Job Description The Geometry Scalability team builds the systems that power both Avatars and Environments across Roblox. Our mission is to enable millions of developers to build large, high-fidelity worlds and multiplayer experiences that still run smoothly on phones and low-end devices. We’re the team that lets Roblox experiences evolve from simple platformers into massively multiplayer, open-world, AAA-quality games. This is a CEO-level priority: how Roblox “ages up” from kids’ games to experiences everyone wants to play, by making higher-fidelity avatars and environments performant at platform scale. You Will: Design and ship 3D engine systems for avatar and environment geometry, including mesh processing, level of detail, transcoding, streaming, runtime loading, and related performance systems. Partner closely with other teams (Rendering, Avatar, Studio) and external developers so that the features you build are directly usable to create amazing experiences. Profile and improve the performance of our game engine across a wide range of devices, with particular attention to mobile. Lead by example: drive projects end-to-end, mentor other engineers, and help set a high bar for technical qu

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. Observability Engineering owns the breadth and depth of observability and telemetry at Smartsheet. We build and operate the shared platform every engineering team depends on to understand how their software behaves in production (metrics, logs, distributed traces, RUM, synthetics, and AI/agentic telemetry) across a global, multi-region, commercial and government footprint. We are consolidating ownership of all of it into a single correlated platform, and treating telemetry as what it actually is: one of the largest and most valuable datasets at the company. It's a broad mandate with real scope to shape, and we hold this internal platform to the same rigor, reliability, and product standards as customer-facing software. As a Principal Software Engineer (Observability & Telemetry Data) , you will set the technical direction for how Smartsheet collects, models, stores, and derives value from telemetry data. This is an architect role: you will define the telemetry data platform and the standards that govern it, carry that architecture across engineering org boundaries, partner with our Data and AI Platform teams on Databricks and MLflow integration, and act as the company's definitive technical voice on observability. You will influence roadmaps you do not own, resolve the hard design trade-offs between fidelity and cost, and raise the technical bar for every engineer instrumenting a service. This full-time position reports to the Team Lead, Observability Engineering and can be located in our Bellevue, WA off

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. The Consumer Apps Desktop team owns the Windows and macOS foundation behind every Roblox session on a PC or Mac: the window, the launch path, and the shell that holds everything together. You will own that foundation with us. We are dedicated to delivering superior performance, reliability, and user experience on Windows and Macs. As a Senior Software Engineer on the Desktop team, you'll be a driving technical force; you will lead complex client work end-to-end and raise the quality bar across our codebase. You will lead projects at that scale end-to-end, set the technical standard in a codebase millions of people depend on daily, and partner with product, design, and platform teams to ship work that is polished and fast at scale. You Will: Shape & improve the Windows and macOS experience that millions of players see every day. Own major Windows and MacOS initiatives end-to-end from ambiguous idea to shipped, measured, and iterated on. Rebuild the parts of the app every player touches: how it launches, how it renders, how it lives in the OS. Set the technical standard through code review, mentorship, and the code you write yourself. Make platform bets that pay off for engineering teams

Who we are About Stripe Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world’s largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone’s reach while doing the most important work of your career. About the team The Storage Abstractions (STAX) team builds the software layer through which Stripe services access stored data. We own the database SDKs that hundreds of Ruby and Java services use to read and write data safely, reliably, and efficiently without needing to understand the underlying database, routing, or operational complexity. Our work creates leverage across Stripe: by providing stable interfaces and safeguards at the storage layer, we help teams build products with confidence while enabling Stripe’s data architecture to evolve. Alongside engineers, we are designing for AI agents as customers of this foundation, making storage capabilities discoverable, interoperable, and safe to use across languages and storage backends. What you’ll do As a Staff Software Engineer on STAX, you will set technical direction and lead multi-year initiatives at the intersection of developer infrastructure, data access, and AI. You will work hands-on with engineers across Stripe to make storage access simpler, safer, and more interoperable, while helping product and infrastructure teams evolve their systems without fleet-wide migrations. You will help turn Stripe’s AI strategy into practical developer infrastructure by treating AI agents as customers of the storage layer. This is an opportunity to build frameworks and interfaces that make complex storage operations discoverable, interoperable, and safe for both human developers and agentic workflows, while rais

About Flexport: At Flexport, we believe global trade can move the human race forward. That’s why it’s our mission to make global commerce so easy there will be more of it. We’re shaping the future of a $10T industry with solutions powered by innovative technology and exceptional people. Today, companies of all sizes—from emerging brands to Fortune 500s—use Flexport technology to move more than $19B of merchandise across 112 countries a year. The recent global supply chain crisis has put Flexport center stage as we continue to play a pivotal role in how goods move around the world. We are proud to have the support of the best investors in the game who believe in our mission, solutions and people. Ready to tackle global challenges that impact business, society, and the environment? Come join us. The opportunity: Flexport is a platform for global trade in an industry that comprises 12% of the global GDP. We are the first licensed freight forwarder and customs brokerage built around a modern tech stack. We help the world's fastest-growing brands manage their international supply chains, providing a fully-managed service for moving products between any two places on the planet. Exceptional software development is integral in allowing us to fulfill our mission of fixing the user experience in global trade. At Flexport you’ll develop products that are at the forefront of reshaping the entire logistics & supply chain industries. You’ll work alongside self-starters interested in solving real-world problems and streamlining the inefficiencies in the complex global trade industry. You’ll have the opportunity to reshape an industry by creating the new operating system for global trade. Our engineers are top-notch software developers who love listening to the users, working as a team, and proactively taking the lead whenever necessary. The role involves learning the business of freight forwarding, modeling the work that people do to move freight, desi