Top Senior Software Engineer Jobs

Develop and sustain mission-critical software and systems for a U.S. Government customer. The role requires full-stack Java and Angular experience, collaboration with engineering teams, independent work, and strong communication. Candidates must hold an active or reinstatable TS/SCI with Polygraph clearance, be U.S. citizens, and have 14 or more years of software engineering experience plus a relevant bachelor’s degree or approved experience substitution.

Develop and sustain mission-critical software and systems for a U.S. Government customer. The role requires strong software engineering expertise, AWS and back-end development skills, collaboration, independent work, and effective communication. The position supports a large government contract and requires an active or reinstatable TS/SCI clearance with polygraph, U.S. citizenship, and extensive professional experience. It is based in Hanover, Maryland, with partial telework potentially available after acclimation.

Build, own, deploy, and operate backend services and APIs powering Mozilla products. Responsibilities include backend development, cloud infrastructure collaboration, monitoring and alerting, production support, incident response, releases, security and privacy reviews, API design, code reviews, and mentoring. The role requires end-to-end service ownership, on-call participation, and maintaining reliable production systems.

Build and own backend services for Mozilla’s Ecosystem Services, including server-side logic, APIs, distributed systems, cloud infrastructure, monitoring, deployments, and production reliability. Participate in on-call support, incident response, releases, security and privacy reviews, code reviews, and cross-functional collaboration. Mentor junior engineers and drive improvements in quality, testing, and engineering processes.

Develop and sustain mission-critical software and systems for a U.S. Government customer. Responsibilities include backend Java development, REST API and service architecture, database integration, debugging, code reviews, automated testing, and Agile collaboration. The role may also involve distributed systems, CI/CD, DevOps technologies, cloud platforms, containerization, and technical problem-solving. An active or reinstatable TS/SCI clearance with polygraph and U.S. citizenship are required.

Build and own full-stack features across patient, clinician, and operational healthcare products. Responsibilities include architecture, scalable coding, testing, CI/CD, code review, technical discussions, stakeholder collaboration, and mentoring. The role requires daily use of AI coding tools and ownership of projects from ideation through rollout. Experience with healthcare, EHR integrations, regulated domains, or consumer startups is beneficial.

Lead frontend and full‑stack projects across Marimo's open-source ecosystem. Design simple, powerful editor experiences, build performant data visualizations and editor extensions, engage with the community, triage issues, and balance community needs with product roadmap.

Define the architecture strategy for compliant computation and storage across the Bing Search platform. Lead distributed storage and data processing architecture at petabyte scale, establish privacy, security, governance, residency, retention, and compliance standards, and translate regulatory requirements into technical capabilities. Drive cross-organizational modernization initiatives, influence senior stakeholders, develop multi-year roadmaps, evaluate emerging technologies, and mentor senior engineers and architects.

Design and develop software to onboard hardware accelerators and improve cluster-level storage performance. Collaborate across teams, produce design docs, implement and optimize code, perform tuning and RCA, act as DRI, and participate in on-call operations and scaling/validation efforts.

Lead design and implementation of Pinterest's exabyte-scale data lake storage and metadata systems. Drive architecture and execution for scalable storage features supporting large ML/AI workloads, collaborate across data/ML/infrastructure teams, and contribute to open-source projects (Iceberg, Spark, Flink).

Build and scale user-facing desktop and mobile web features for millions of users. Own product development from prototyping and A/B testing through architecture, implementation, and launch. Collaborate with product managers, designers, and backend engineers; advocate for user needs; write reliable, maintainable code; mentor teammates; lead code reviews; and use AI thoughtfully while validating its outputs.

Develop native applications for iPhone, iPad, Apple TV, and Apple Vision Pro. Lead feature development across the application lifecycle, write well-tested and performant code, resolve production issues, improve team processes, and collaborate on sustainable architectures. Mentor engineers through code reviews and pair programming, guide agile delivery, and present solutions to technical and non-technical stakeholders. Integrate backend systems, web services, and third-party software, with AVPlayer and video playback experience preferred.

Build and enhance ABC News direct-to-consumer client applications for Roku streaming devices and smart TVs using BrightScript and SceneGraph. Develop onboarding, browsing, analytics, video playback, and UI features; create reusable components and utilities; optimize performance across devices; and collaborate with Roku, design, SDK, backend, mobile, and product teams. Contribute to JavaScript, React, Node.js, build tooling, AWS, and DevOps systems while supporting hardware, firmware, and certification efforts.

Design, build, deploy, and operate cloud infrastructure and scalable I/O systems for scientific computing, physics simulations, AI workflows, and data-intensive workloads. Optimize compute, storage, and network architectures across CPU and GPU environments. Develop algorithms, debug systems and third-party code, and improve performance across distributed systems, operating systems, kernels, compilers, and parallel-processing frameworks while collaborating independently across teams.

Own the design, development, and automation of Coinbase’s routing infrastructure connecting services to Kubernetes backends. Build scalable capabilities using Envoy, Istio, Ambient Mesh, and SPIFFE; improve routing latency, reliability, and performance; enhance developer tooling with responsible AI; and collaborate with security, reliability, and observability teams to resolve complex distributed-systems issues.

Develop scalable backend services and APIs, create coding tasks and deterministic verifiers for AI systems, debug complex codebases, optimize performance, refactor legacy systems, implement features, and provide technical reviews and reasoning. The role is remote, contract-based, and part-time at 15–20 hours per week.

Develop LLM-powered automation and agent tooling for legacy code analysis and modernization. Build cloud-native migration services, scalable Spark and Databricks data platforms, ETL frameworks, data models, validation controls, and Airflow-orchestrated workflows. Reverse-engineer mainframe and database workloads, transform legacy logic into microservices, optimize MongoDB schemas, and implement near-real-time data synchronization. Requires extensive data engineering, cloud, Python, and AI framework experience.

Designs and leads enterprise backend systems, streaming services, distributed architectures, APIs, databases, Kubernetes deployments, and DevOps automation. The role also contributes to full-stack delivery, product ownership, technical prototyping, client presentations, and end-to-end application delivery while coordinating onshore and offshore teams.

Lead development and maintenance of internal design system libraries, tools, and Figma plugins. Implement AI solutions to speed design workflows, own medium-to-large features end-to-end, run internal user research, provide support and on-call coverage, conduct design and code reviews, and collaborate with designers and engineers to drive technical strategy and adoption.

Lead the architecture, development, testing, and maintenance of scalable backend systems and APIs. Drive technical decisions, code quality, performance optimization, documentation, continuous delivery, and monitoring. Collaborate with product, design, and engineering teams to translate requirements into reliable solutions. Mentor junior engineers, conduct code reviews, resolve complex technical issues, and contribute to agile development and overall technology strategy.

Senior Software Engineer supporting a U.S. Government customer by sustaining critical mission-related software and systems. The role requires extensive software engineering experience, strong communication, teamwork, and independent work. Candidates must hold an active or reinstatable TS/SCI with Polygraph clearance and U.S. citizenship. Key technologies include Hadoop, Accumulo, AWS, Terraform, Java, and Python. The position is based in Annapolis Junction, Maryland, with limited telework available after acclimation and training.

Develop and sustain mission-critical government software and systems as a senior Python engineer. Apply Python and related technologies including Kotlin/Java, Terraform, Elasticsearch, OpenSearch, and AWS. Work independently and collaboratively on software engineering projects, support customer mission needs, and contribute to reliable solutions using Agile development practices. The position requires a TS/SCI with Polygraph clearance and supports partial telework after acclimation and training.

Serve as the technical anchor for a cross-functional engineering squad building healthcare data platforms. Design and maintain Java Spring Boot, React, and Python data-processing applications; guide architecture, code quality, estimation, releases, integrations, and issue resolution. Build reliable data delivery pipelines, mentor peers, support Agile execution, and promote responsible AI-assisted development using tools such as GitHub Copilot.

Build and operate large-scale financial systems, distributed data platforms, and pipelines for Stripe. Responsibilities include translating fintech requirements into scalable software, leading multi-team technical projects, debugging production issues, analyzing complex datasets, supporting payment infrastructure, and improving data pipeline reliability through monitoring and automation.

Design, develop, debug, test, optimize, and maintain software applications supporting warfighter readiness. Build database structures and web interfaces, integrate components, document solutions, and use containerization technologies. Collaborate with Agile teams, contribute to technical decisions, maintain development traceability, and deliver solutions through sprint cycles. The role also involves mentoring developers, writing unit and integration tests, and applying CI/CD, Git, and DevSecOps practices.