Top Senior Software Engineer Jobs

Build end-to-end fullstack features for a mental healthcare platform: design APIs and UIs, manage clinical and practice-management systems, integrate AI capabilities, and own product outcomes from schema to frontend.

Headway seeks a Staff Fullstack Engineer to own end-to-end product work across frontend and backend. You’ll build practice management, patient/provider engagement, AI-enabled clinical systems, onboarding, growth tools, and platform foundations. The role requires technical leadership, cross-functional strategy, mentoring, and shipping scalable, reliable systems in a complex healthcare domain.

Design and build reliable backend services powering clinical data, insurance billing, patient-facing infrastructure, and financial ledger systems. Scale high-integrity systems requiring idempotency, strong consistency, and pragmatic AI integration to automate provider workflows and enable personalized patient experiences.

Designs, builds, tests, documents, operates, and maintains software supporting electromagnetic warfare solutions, military exercises, and real-world missions. Responsibilities include resolving defects, supporting releases, gathering requirements, collaborating with customers and cross-functional teams, and improving development processes. The role requires troubleshooting production issues, applying Agile methods, and supporting mission-critical defense programs. Travel up to 25% is required.

Leads end-to-end development of secure, scalable customer-facing software using full-stack and cloud technologies. Designs systems, writes and reviews production code, improves reliability and performance, and guides technical decisions. Provides mentorship, code reviews, and coaching to engineers while promoting software development lifecycle practices, Terraform-based infrastructure, AWS cloud adoption, and responsible AI-assisted engineering. Collaborates with vendors and cross-functional teams to evaluate architectures and deliver resilient digital banking experiences.

Design, develop, and validate functionally safe software for robotic perception systems. Build safety-critical architecture across Linux and real-time operating systems, create testing and validation frameworks for edge cases, collaborate with machine learning, hardware, and core software teams, and mentor junior engineers on safety-critical coding practices.

Build scalable distributed systems for Rula’s Marketplace Health Engine, improving provider utilization, marketplace efficiency, and patient access. Partner with Engineering, Product, Data, and Operations; lead technical strategy across teams; design backend services, APIs, and data-intensive systems; drive projects from discovery through post-launch support; solve complex marketplace problems; mentor engineers; and remain hands-on in software development.

Design, develop, test, and maintain Java backend services, APIs, microservices, and distributed systems supporting enterprise claims and payment solutions. Collaborate with product and business stakeholders, contribute to architecture, build CI/CD pipelines, operate containerized applications, and support production services through monitoring and troubleshooting. Apply clean code, TDD, automated testing, security, and Agile engineering practices while helping guide the platform’s technical direction.

Build enterprise platforms and tools supporting AI-enabled animation production. Partner with senior engineers, artists, technical directors, infrastructure, and security teams to evaluate algorithms, prototype workflows, develop APIs, manage generated assets, maintain production tracking tools, monitor hardware and software usage, and standardize secure workflows across shows.

Design, build, and operate low-latency, high-throughput ad delivery systems for bidding, ranking, auctions, and budget enforcement. Integrate ML signals, collaborate with product and data teams, improve observability and reliability, lead design discussions, and mentor junior engineers.

Own and develop Arena’s public web surfaces, including the blog, marketing pages, and leaderboard UI. Build with Next.js, React, TypeScript, Sanity CMS, and the company design system. Improve performance, accessibility, SEO, structured data, internationalization, and data visualization. Create CMS models and publishing tools that enable marketing teams to ship independently while collaborating closely with designers, marketers, and engineers.

Leads software development for mission-focused cyber and defense capabilities. Guides development teams, mentors engineers, conducts code reviews, integrates databases and data-transfer protocols, implements architectural and system improvements, and builds scalable, automated digital solutions. The role requires advanced programming experience, database integration skills, and the ability to obtain a TS/SCI clearance.

Lead technical direction for billing workflows across frontend and backend systems. Define shared architecture, APIs, components, and observability; oversee large-scale tables, bulk operations, claims workflows, and platform rebuilds. Apply AI to claim comparison and error analysis, while owning performance, reliability, architecture reviews, code quality, and mentoring across teams.

Own and develop backend and full-stack services, including architecture, deployment, production reliability, scaling, and infrastructure improvements. Translate customer needs into technical solutions, collaborate with product and design, mentor engineers, and improve engineering standards. The role requires independently delivering production software in Python, TypeScript, or Go within a fast-growing environment.

Build backend-focused full-stack systems and AI workflows, integrating language models into secure, scalable production services. Own projects from early concepts through delivery, scale systems as adoption grows, and improve architecture, observability, and code quality. The role requires independent execution, strong Python skills, and experience with APIs, distributed systems, or data-heavy backends. Healthcare technology experience and production generative AI experience are advantageous.

Own complete product features from discovery and design through backend implementation and release. Build and scale backend systems, contribute to architecture and delivery, use AI development tools, and make product decisions through customer conversations and user-experience judgment. The role requires independent execution, end-to-end systems ownership, and hands-on development of AI or LLM-powered features in an onsite startup environment.

Build and maintain Cloudflare’s globally distributed Quicksilver key-value store using Go and C. Develop features, improve CPU and memory performance, enhance monitoring and operational tooling, and debug complex, hard-to-reproduce issues across the software stack. Responsibilities include code reviews, testing, deployments, rollbacks, operations, alerting, and on-call support for a system operating across tens of thousands of servers and hundreds of data centers.

Develop, prototype, integrate, and test Python-based software for missile warning/tracking missions. Contribute to containerization, testing, deployment, and provide technical guidance to team members while supporting DoD programs and maintaining high software engineering standards.

Develop and maintain LAMP and Perl software applications, taking ownership of existing implementations and designing new solutions. Build REST or SOAP APIs, create unit tests, implement test automation, and work with UNIX command-line tools. The role may involve high-throughput, highly available transaction-processing systems, along with Java, Spring, Hibernate, SVN, and object-oriented design. Candidates should work independently, communicate effectively, and have at least eight years of overall software development experience.

Lead design, development, and testing of payload flight software in Rust for attitude/pointing, command handling, telemetry, and data storage. Define architecture and coding conventions, implement FDIR, build automated test infrastructure (simulation/HIL), integrate with GNC/avionics/electrical teams, support integration, launch, and on-orbit ops, investigate anomalies, and mentor other engineers to achieve a near-term on-orbit demonstration.

Develop and support native Android features for eBay’s high-traffic Homepage experience. Responsibilities include coding, testing, deployment, production support, architecture contributions, complex project delivery, code reviews, mentoring, reusable component development, tooling improvements, and collaboration with product, design, backend, and platform teams.

Leads software engineering within an Identity and Access Management team, designing, developing, testing, debugging, and operating secure, scalable applications and APIs. Drives adoption of AI-assisted engineering practices with appropriate validation, improves automation and application stability, evaluates architectural solutions, and promotes modern technologies through technical leadership and communities of practice. Requires expertise in software development, cloud-native systems, AWS, infrastructure as code, REST APIs, CI/CD, automated testing, and Agile delivery.

Develops, integrates, tests, deploys, and sustains C++ and C# software for high-fidelity missile warning training in JLVC HLA environments. Responsibilities include software architecture, requirements analysis, agile development, unit testing, code reviews, documentation, customer collaboration, risk identification, and schedule estimation across classified and unclassified environments.

Build and release full-stack product features for case management and applicant experiences. Develop complex React interfaces, backend services, data models, APIs, document collaboration tools, and real-time workflows. Partner with product, design, operations, and customers to create usable solutions. The role also involves supervising AI-assisted workflows and addressing state management, synchronization, concurrency, performance, workflow orchestration, queues, retries, and idempotency.

Design, develop, and maintain scalable, cloud-native Java/J2EE services and APIs for equity investments. Collaborate with business and engineering teams to document requirements, implement multi-threaded solutions, create tests, perform code reviews, mentor junior engineers, and apply CI/CD and agile practices to deliver high-quality financial software.