Top Senior Software Engineer Jobs in Washington, DC

Lead design and delivery of secure native iOS and Android apps. Architect security- and privacy-focused features, integrate backend microservices, optimize performance, mentor peers, and uphold best practices in testing and deployment.

Lead design and implementation of automated test frameworks and V&V for web, API, data, and backend systems. Integrate testing into CI/CD, support audit readiness and compliance (ASME NQA-1), manage defects and root-cause analysis, and drive quality metrics, documentation, and continuous improvement across engineering teams in a regulated nuclear environment.

Lead design and implementation of NOS modules and applications across desktop, mobile, and field surfaces. Make architecture decisions, write production code, lead reviews, mentor engineers, integrate with platform services, and translate operational/regulatory needs into working software.

Lead end-to-end engineering projects building Node.js backends and React frontends, scale core APIs to millions of requests, debug using monitoring/logging, participate in code reviews and hiring, and collaborate on product roadmap driven by customer needs.

Develop and maintain enterprise applications supporting creator rights and royalty payments. Own features across Vue.js front ends and Java/Spring Boot back ends, participate in architecture and Agile development, write and review code, design and test data-driven solutions, improve engineering standards, collaborate with stakeholders, mentor junior engineers, and work with large-scale data, AWS services, distributed systems, and microservices.

Develops and enhances computer and network software for Naval Sea Systems Command programs. Responsibilities include analyzing user needs, designing software solutions, integrating hardware and software systems, developing specifications and performance requirements, and maintaining application databases. The role supports program management and requires extensive experience with naval surface radar, electronic warfare, EO/IR, decoy, or laser software systems. Work is primarily on-site at Washington Navy Yard, with infrequent travel to naval locations.

Supports Naval Sea Systems Command by analyzing user needs, designing and enhancing software, maintaining application databases, integrating hardware and software systems, and developing technical specifications. Collaborates across engineering, acquisition, logistics, security, and program-management disciplines. Applies systems engineering reviews, requirements decomposition, technology-readiness measures, program protection, and risk-management processes. The role is primarily on-site at Washington Navy Yard with infrequent travel to naval locations.

Design, build, and maintain web application infrastructure and data systems for interactive information experiences. Lead application architecture, code quality, performance, and reliability; integrate generative AI and prototype XR interfaces; collaborate with designers and data scientists; ensure security, accessibility, scalability, and document technical standards.

Develop backend Command & Control (C2) systems connecting Quindar's platform to satellites. Implement machine-to-machine communication, binary protocols, serialization, transport, stateful comms, telemetry, and hardware integrations. Onboard diverse spacecraft, translate interfaces into maintainable integrations, build scalable abstractions and tooling, and improve reliability, observability, and performance while collaborating cross-functionally.

As a Senior Software Engineer, you will enhance user experience for maritime tech, develop a real-time data platform, and oversee large engineering projects.

Lead design and implementation of cloud-based backend systems for global antenna scheduling, customer-facing APIs, billing/metering, and orchestration. Build reliable, scalable control and data planes across cloud and on-prem, collaborate with customers and operations, and enable secure TT&C and payload data transfer.

Serve as the sole QA resource in a classified environment to validate and certify platform releases. Design and execute end-to-end/system test plans and automation, maintain test configurations and lab environments, partner with development and release teams, review changes in test/staging, and ensure critical customer workflows remain functional for weekly releases.

Lead and manage an API engineering team owning core services for Fundrise investor applications. Set technical direction, coach engineers, drive architecture, ensure production quality, security, monitoring, and coordinate cross-team delivery.

Design, build, and operate Peregrine's cloud platform to improve performance, reliability, security, and cost-efficiency. Own infrastructure projects end-to-end, automate region/environment provisioning, implement autoscaling and right-sizing, harden security and compliance controls, improve incident response, and create developer-facing tooling and documentation. Mentor junior engineers and influence cross-team technical decisions.

Design and scale distributed systems for Ditto's edge-to-cloud capabilities, lead services development in Rust, and mentor engineers.

Lead design and implementation of compliance and multi-region deployments, build IaC (Terraform/Atmos) for AWS/GovCloud, develop full-stack features (TypeScript/React Native), establish shift-left tooling, ensure architectural consistency across regulated and commercial environments, drive cross-team technical initiatives, troubleshoot distributed systems, and produce documentation and audit-ready standards.

Design, build, and maintain cloud-native full-stack applications and backend services that support investment risk analysis. Own end-to-end delivery, contribute to architecture, apply automated testing and CI/CD, collaborate with stakeholders, reduce technical debt, and ensure reliable, observable data and analytics for portfolio risk and simulations.

Lead the redesign and modernization of legacy applications, resolve complex issues, mentor teams, and maintain stakeholder relationships in a dynamic environment.

As a Sr. Software Engineer, you will improve existing code, solve performance issues, mentor team members, and develop web applications using Java and Spring.

Build and own user-facing product experiences (Search, Dossier, Maps, Dashboards, etc.), collaborate with design and product, ship fast, reliable full‑stack features, integrate AI/semantic discovery, optimize latency and resilience, and iterate with deployment and users.

Lead development and maintenance of React-based enterprise web applications; own architecture and code quality; mentor engineers; plan and estimate work; integrate vendor/customer hardware; modernize healthcare IT and continuously improve development processes.

Build systems to stream and translate Unity content into other renderers while preserving visual fidelity and performance. Design compact scene-state representations, compression strategies, and stable, scalable rendering pipelines. Profile and optimize end-to-end rendering for high framerates, tackle shader translation and resource lifetime, and work across graphics, networking, distributed systems, and AI-assisted workflows.

Design and implement runtime protocols, formats, and systems to capture, serialize, stream, and replay interactive 3D content across engines. Own C++ runtime and C# APIs across editor, build, simulation, streaming, and playback. Optimize for low-latency, determinism, memory and bandwidth constraints, and build AI interfaces for inspecting and invoking engine state.

Lead backend engineer to design, build, and re-architect GEICO's billing platform (billing engine, invoicing, payments, collections, commissions, CRM/subscriptions). Own system design, quality, performance, and scalability; provide technical guidance across billing teams, identify and mitigate risks, collaborate with product/design, and mentor engineers.

As a Senior Software Engineer, you'll design architecture, mentor engineers, and drive the adoption of AI practices to enhance development workflows and system reliability.