Senior It Systems And Security Engineer Jobs

We believe communication belongs to everyone. We exist to democratize phone service. TextNow is evolving the way the world connects and that's because we're made up of people with curious minds who bring an optimistic, yet critical lens into the work we do. We're the largest provider of free phone service in the nation. And we're just getting started. Join us in our mission to break down barriers to communication and free the flow of conversation for people everywhere. TextNow is looking for an experienced Senior Web Developer to play a key role in the development of our voice and messaging platform on Web. You will be responsible for building high-performance, scalable, and feature-rich mobile applications that integrate voice, video, and messaging capabilities. You will work alongside a talented team of developers, product managers, and UX/UI designers to create intuitive and user-centric experiences. What You'll Do Design, develop, and maintain a high-quality Web application focused on voice and messaging features (voice calling, chat, real-time notifications, etc.). Write clean, maintainable and testable Web applications in Javascript using the latest programming techniques and frameworks Collaborate with cross-functional teams to define, design, and ship new features. Work with real-time communication protocols, such as WebRTC, SIP, and related messaging and voice frameworks. Optimize app performance to ensure smooth voice and messaging functionality, including audio quality, latency, and bandwidth usage. Troubleshoot and debug issues related to performance, crashes, and other bugs, ensuring a smooth and stable user experience. Own problems and solutions end-to-end, from ideation to deployment Experimentation is a key part of your workflow; be data-driven and make the right decisions for our customers Dep

We believe communication belongs to everyone. We exist to democratize phone service. TextNow is evolving the way the world connects and that's because we're made up of people with curious minds who bring an optimistic, yet critical lens into the work we do. We're the largest provider of free phone service in the nation. And we're just getting started. Join us in our mission to break down barriers to communication and free the flow of conversation for people everywhere. TextNow is looking for an experienced Senior Web Developer to play a key role in the development of our voice and messaging platform on Web. You will be responsible for building high-performance, scalable, and feature-rich mobile applications that integrate voice, video, and messaging capabilities. You will work alongside a talented team of developers, product managers, and UX/UI designers to create intuitive and user-centric experiences. What You'll Do Design, develop, and maintain a high-quality Web application focused on voice and messaging features (voice calling, chat, real-time notifications, etc.). Write clean, maintainable and testable Web applications in Javascript using the latest programming techniques and frameworks Collaborate with cross-functional teams to define, design, and ship new features. Work with real-time communication protocols, such as WebRTC, SIP, and related messaging and voice frameworks. Optimize app performance to ensure smooth voice and messaging functionality, including audio quality, latency, and bandwidth usage. Troubleshoot and debug issues related to performance, crashes, and other bugs, ensuring a smooth and stable user experience. Own problems and solutions end-to-end, from ideation to deployment Experimentation is a key part of your workflow; be data-driven and make the right decisions for our customers Dep

Spotify’s Subscriptions Mission focuses on converting listeners into lifelong subscribers by delivering seamless, valuable experiences across pricing, packaging, and customer journeys. We build the systems and tools that power acquisition, retention, and overall subscription growth at scale. The Messaging Platform powers Spotify’s communications to over a billion users — from push notifications to emails and in-app messages that connect listeners to the content they love. Within this space, the Paloma squad focuses on message optimization: deciding which message reaches which user, through which channel, and at what moment. We’re evolving how messaging works at Spotify — moving from short-term optimization toward systems that understand long-term user journeys. By combining reinforcement learning approaches with deeper domain signals, we’re expanding how machine learning shapes the entire messaging funnel. What You'll Do Design, build, and ship machine learning models that optimize messaging across push, email, and in-app channels Plan and run A/B experiments in a multi-objective environment, balancing conversion, engagement, retention, and reachability Contribute to reinforcement learning systems that optimize for long-term user outcomes rather than immediate interactions Partner with product managers, data scientists, and engineers to define what success looks like and how to measure it Own the full ML lifecycle, from data and modeling to deployment, monitoring, and iteration Integrate ML models with upstream systems, including domain value signals and oppor

Who We Are At OKX, we believe that the future will be reshaped by crypto, and ultimately contribute to every individual's freedom. OKX is a leading crypto exchange, and the developer of OKX Wallet, giving millions access to crypto trading and decentralized crypto applications (dApps). OKX is also a trusted brand by hundreds of large institutions seeking access to crypto markets. We are safe and reliable, backed by our Proof of Reserves. Across our multiple offices globally, we are united by our core principles: We Before Me , Do the Right Thing , and Get Things Done . These shared values drive our culture, shape our processes, and foster a friendly, rewarding, and diverse environment for every OK-er. OKX is part of OKG, a group that brings the value of Blockchain to users around the world, through our leading products OKX, OKX Wallet, OKLink and more. What You'll Do Design and develop strategies and product enhancements for the global P2P business (ex-Hong Kong) to align with business growth objectives and drive their implementation. Establish effective growth strategies by integrating real business scenarios with data analysis; gain in-depth understanding of global P2P market characteristics, address user needs and pain points across each market, and enhance product usability and overall user experience. Build a user risk control and quality management system, establish standardized user operations mechanisms, identify high-risk user profiles through effective risk control strategies, and drive the refinement and upgrade of risk control models. Maintain strong data sensitivity and establish a comprehensive business funnel data analysis framework; stay current with industry and market trends, continuously produce analytical reports and actionable strategies, and provide guidance for product upgrades and business direction. 为非香港全球P2P业务设计和制定符合业务发展的策略和技术功能，并推进落地执行； 建立有效的业务增长策略，能够结合业务实际场景和数据分析进行综合应用；同时深入了解全球P2P市场的特性，解

About Appier Appier is an AI-native Agentic AI as a Service (AaaS) company that uses artificial intelligence (AI) to power business decision-making. Founded in 2012 with a vision of democratizing AI, Appier’s mission is turning AI into ROI by making software intelligent. Appier now has 17 offices across APAC, Europe and U.S., and is listed on the Tokyo Stock Exchange (Ticker number: 4180). Visit www.appier.com for more information. Open to overseas candidates/Visa Support This position is based in Tokyo, Japan. For international candidates, Appier's Japan office provides visa sponsorship to ensure a smooth transition to Japan. The Impact You’ll Make at Appier Appier is seeking a Senior Machine Learning Scientist to join our Advertising Cloud Optimization team , which leads the development of core machine learning algorithms driving campaign efficiency and advertiser ROI. Our programmatic advertising platform operates at a massive scale, handling over multi millions queries per second (QPS), all powered by our proprietary deep learning models for bidding, pricing, and personalized content delivery. In this role, you’ll further improve bidding strategies, audience targeting and creative optimization by deep-diving RTB ecosystem including SSP/DSP/MMP to design the strategy, enhancing user signals or applying advanced deep learning model What You’ll Work On Deep-dive the RTB ecosystem to identify the potential direction and decide the bidding strategy Leverage advance deep learning model to improve bidding/audience model performance Co-work with teams to improve real-time/long-term user interaction signal collection and to further improve model performance What We’re Looking For Master’s or PhD’s degree in Computer Science, Machine Learning, Statistics, or related field. 3+ years of industry experience on RTB ecosystem Proficiency in Python and SQL experience with modern ML frameworks and deep learning model (PyTorch, TensorFlow, etc.). Strong ownershi

Screener is responsible to ensure the safe and efficient screening of hold baggage, ensuring compliance with regulatory standards and the detection of prohibited items or security threats. The Screener will be responsible for operating screening equipment, documenting findings, collaborating with other security staff, and interacting with passengers to maintain the highest standards of security. Source: Adani Group | Job ID: 49118

Job Title: Senior Software Engineer Company: Canopy, Inc. Location: SF Bay Area About Us: At Canopy, we're on a mission to make hospitals a safer place for healthcare workers through innovative technology. We're a dynamic and forward-thinking company, known for our reliable and user-friendly solutions and commitment to pushing boundaries. Our team is composed of top talent from diverse backgrounds, and we're looking for a Senior Engineer to join our exciting journey in the SF Bay Area. What You'll Be Doing: As a Senior Software Engineer at Canopy, you will play a pivotal role in developing, enhancing, and scaling our groundbreaking products and services from building new features to optimizing existing systems. You'll have the opportunity to work on a wide range of projects that have a meaningful impact on the lives of healthcare workers. Here are some of the challenges you'll tackle: Innovate: Work on cutting-edge technologies and collaborate with a team of top engineers to design, develop, and implement solutions that have a meaningful impact on healthcare workers' lives. Mastery: Develop both front-end and back-end components of our applications, ensuring seamless user experiences on top of our robust and scalable kubernetes platform. Influence: Participate in brainstorming sessions, code reviews, and architectural discussions to shape the direction of our products and services. Problem solve: Tackle complex technical problems and find creative solutions to overcome challenges. Collaboration: Collaborate with cross-functional teams, including designers, product managers, and other engineers, in our remote-first organization to bring innovative ideas to life. Mentorship: Share your knowledge and expertise with team members, fostering a culture of learning and growth. What We're Looking For: Bachelor's or Master's degree in Computer Science, Software Engineering, or related field, or equivalent experience. 5+ years of experience in development Proficiency with mode

We are looking to hire a Senior Manager, FP&A to be a strategic business partner with our Sales and Marketing organization. This individual will be responsible for partnering cross-functionally with senior management to build annual budgets, manage forecasts, and provide decision support through financial analyses to ensure optimal returns on strategic investments. This is a key position providing guidance on financial and operational matters across the entire organization. Duties and Responsibilities: Serve as the strategic finance partner to Sales and Marketing leadership (CRO, CMO, and their teams), influencing go-to-market strategy, investment priorities, and resource allocation Own the GTM portion of the annual operating plan, quarterly reforecasts, and long-range plan, including bookings, pipeline, quota capacity, headcount, and Sales & Marketing operating expenses Lead capacity and productivity planning with Sales Operations: rep hiring plans, ramp assumptions, quota setting, territory coverage, and attainment Partner with Marketing to model and optimize demand-gen spend, pipeline contribution, funnel conversion, and channel ROI Own reporting and analysis of key GTM and SaaS unit economics, including ARR, net new ARR, net and gross revenue retention, churn, CAC, CAC payback, LTV:CAC, and S&M efficiency (magic number) Lead monthly and quarterly close for S&M: budget-vs-actual and forecast-vs-actual variance analysis, holding leaders to their budgets and explaining what drove performance Prepare and present Sales & Marketing performance updates, business reviews, and recommendations to the executive team, and contribute GTM content to board materials Build business cases and scenario models for major GTM decisions, such as new segments or geographies, pricing and packaging, partner/channel programs, and large marketing investments Partner with Sales Ops, Accounting, and HR/Total Rewards on sales compensation plan design, cost modeling, and 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. As a Senior Security Software Engineer for Infrastructure Security you will be a part of the Information Security organization and report to the Senior Manager of Infrastructure Security. You will help shape the future of Platform Security at Roblox. We work closely with Production IAM, Network Security, and Cloud Security at Roblox. You Will: Identify security gaps and threats in our cloud and on premise infrastructure, partnering with Governance Risk and Compliance teams to create standards and policies along the way. This will help Roblox meet regulatory and compliance requirements. Harden our infrastructure by introducing secure by default configurations, designs and guardrails for all developers at Roblox. Own and drive solutions that enable Roblox engineers to design, build, and use infrastructure securely at scale. Work closely with other InfoSec teams (AppSec, D&R, GRC, CorpSec, CloudSec, NetSec) and partner with engineering teams across Roblox, specifically the Infrastructure organization, to ensure the secure outcomes of security and product driven initiatives. You Have: 5+ years of experience writing code and/or relevant technical experience. Experience with

Senior Fullstack Software Engineer Location: Soho, NYC / Hybrid (an in-person interview may be required) Department: Engineering The Role We’re looking for a Senior Fullstack Software Engineer to help architect, build, and scale the next generation of our Flowcode 2 platform and consumer experiences. You will join our engineering team with a focus on creating amazing end user hub and landing page experiences that are dynamic and engaging, as well as the platform and management capabilities for creators on the platform. You’ll work across the stack — from contributing to backend services to building out dynamic end to end landing pages. Though this is a full stack position, we are looking for someone that has deep backend experience as well. As one of the senior engineers on a small but highly capable team, you’ll own medium to large sized features, drive technical execution, contribute to a delivery focused environment, and mentor others. You’ll balance hands-on engineering with architectural thinking, helping us move fast while maintaining reliability, performance, and code quality. This is an ideal role for a problem-solver who values simplicity over complexity, enjoys building dynamic and interactive applications and approaches engineering with pragmatism and curiosity. What You’ll Do Design, build, and maintain scalable features across a modern front-end framework and backend services. With support, own key features end-to-end, from data design to user-facing experiences. Architect for growth — help drive your pods’s technical roadmap and shepherd established engineering best practices. Collaborate across teams with product, design, and data to deliver measure, deliver and grows features quickly and iteratively. Write clean, reliable, and maintainable code, with strong attention to performance, best practices and developer experience. Mentor engineers and help elevate technical execution across you pod. Stay pragmatic — balance ideal engineering with the