Top Senior Software Engineer Jobs in Washington, DC

Lead frontend modernization by migrating legacy web apps into a microfrontend ecosystem, ship production-critical React/Next.js code, define reusable platform patterns, and collaborate cross-functionally to ensure performance, developer experience, and long-term maintainability.

Lead Backend Software Engineer responsible for designing and maintaining large-scale applications and distributed systems, focusing on GEICO's core billing platform's scalability and efficiency.

As a Senior Software Engineer, you will lead the development of scalable backend systems, manage feature development lifecycles, and engage with stakeholders to translate mission needs into technical requirements while ensuring implementation meets criteria.

The Staff Software Engineer will lead implementations, mentor engineers, define technical strategies, and communicate with stakeholders while enhancing federal engineering capabilities.

Senior software developer supporting IRS mission-critical Java/middleware applications. Duties include production support, troubleshooting application and integration issues, incident response, release support/validation, enterprise API and microservices development, middleware (IBM webMethods), container orchestration (OpenShift/Kubernetes), application modernization, and Agile/DevSecOps collaboration. Occasional onsite support for meetings, deployments, or knowledge transfer is required.

Senior software developer responsible for implementing application-layer currency and supportability updates for middleware and microservices — including JDK/runtime upgrades, dependency remediation, certificate and credential updates, OpenShift/Linux compatibility, CI/CD and developer validation, rollback planning, and technical documentation.

Provide application-level production support and operations for enterprise middleware and integration services (IBM webMethods and Java-based BRE/BRMG). Troubleshoot production incidents, perform RCA, manage releases, validate failover/fallback, handle certificates/credentials, update runbooks, and maintain 24x7 operational readiness. Work with REST/SOAP APIs, microservices, OpenShift/Kubernetes, monitoring tools (AppDynamics, ELK), and ServiceNow for incident management.

The Senior Software Developer will collaborate with a remote team to enhance the Neuron platform, focusing on software development tasks including distributed system design and maintenance of features.

The Principal Software Engineer leads a team to develop full-stack real-time applications, integrates machine learning models, and influences software architecture in cloud environments while supporting healthcare analytics.

Lead engineer responsible for designing, developing, and optimizing petabyte-scale distributed data processing systems (Hadoop/Spark/Hive/Trino) on AWS. Leads performance tuning, system architecture, DevOps/CI-CD, security, AI tool adoption, and mentors engineers to improve product quality and delivery.

Lead architecture and design for highly available, low-latency cloud services. Drive AI-first engineering practices, evaluate and integrate AI-assisted development tools, mentor engineers, perform code and architecture reviews, and collaborate with Product and Design to build scalable, observable, and automated systems.

Lead end-to-end testing across sprints, design and maintain automated regression suites, create test plans/cases, perform functional/integration/regression/performance testing, log and track bugs, collaborate with developers and product teams, and validate releases. Requires flexibility for occasional evenings/weekends and independent problem-solving.

Lead design and delivery of scalable, cloud-native healthcare systems and real-time data pipelines. Architect event-driven, batch/stream hybrid solutions, integrate clinical data standards, optimize performance and costs, mentor engineers, and collaborate with product and stakeholders to deploy resilient, compliant services.

Design and deliver highly-available, low-latency cloud services and APIs for Vehicle Intelligence/ALPR. Lead architecture reviews, scale ingestion pipelines and APIs, mentor engineers, collaborate with Product and Design, and apply AI agent tools to improve development and customer outcomes.

Design, build, deploy, and operate backend services, APIs, integrations, and web applications. Own end-to-end features, improve CI/CD and observability, troubleshoot cross-service issues, participate on-call, and collaborate with product and leadership to deliver reliable production systems.

Design, build, and maintain Quantifind's Apache Spark batch pipelines and backend platform that generate risk signals from diverse data sources. Implement scalable algorithms, data services, ETL pipelines, and microservices; deploy on Kubernetes and optimize storage/caching and distributed processing. Collaborate with Data Scientists, DevOps, Product, and Sales to deliver performant, testable systems processing terabytes daily.

The role involves leading software development for mission-critical applications, focusing on design, development, and maintenance using various technologies in a cloud environment.

As a Senior Software Engineer in Test Automation, you'll design automation frameworks, develop CI/CD pipelines, and ensure the quality of VR training products.

Design and implement core identity infrastructure for authentication and authorization. Build SSO, MFA, federated identity, and authorization systems (ReBAC/ABAC/RBAC). Create identity governance policies for compliance, integrate IAM with cloud services, and present technical guidance to stakeholders.

Senior Software Developers lead projects by combining front-end and back-end technologies, guiding teams, and ensuring high-quality digital solutions that meet client needs. They mentor junior engineers and engage with stakeholders to improve processes and promote best practices.

Lead design, development, testing, and delivery of backend-focused .NET Core systems. Mentor engineers, drive Agile ceremonies, own end-to-end projects, improve performance and reliability, provide 3rd-level support, and collaborate with stakeholders to implement APIs, databases, cloud, and containerized solutions.

Design, build, and operate petabyte-scale data infrastructure: real-time ingestion, storage (open table formats), and serving. Lead performance, reliability, and cost optimization across Spark and streaming pipelines (Kafka/Flink), define data contracts, and establish best practices and tooling. Collaborate with platform, product, and deployment teams to deliver production-grade data systems on AWS GovCloud, Kubernetes, and Airflow.

Build and maintain scalable, user-centered backend and frontend systems. Design permission and secure collaboration frameworks for cross-organizational data sharing. Own major features end-to-end, work with product and design, iterate with deployment and users, and solve high-scale distributed system challenges.

Lead and mentor engineering teams to design, build, and ship scalable, production-grade software. Own major features, drive technical decisions, collaborate with product and design, and ensure reliable distributed systems supporting real-time collaboration, high-scale data ingestion, and ML-powered features.

As a Senior Software Engineer on the AI Platform team, you will develop AI security features, enhance vulnerability detection, integrate AI patterns, and collaborate across functions to deliver solutions.