Top Senior Software Engineer Jobs in Washington, DC

Design, develop, secure, and modernize scalable omnichannel APIs supporting member-facing applications. Improve API security, resiliency, performance, and observability; apply AI-assisted engineering; collaborate with architecture, security, cloud, product, and operations teams; deliver proofs of concept, reusable patterns, and provide Tier 3 production support and incident response.

Design, develop, and maintain scalable, enterprise-grade backend systems in Java on AWS. Lead system design, implement APIs and data persistence, improve quality via testing and CI/CD, optimize performance, and collaborate cross-team to mitigate risks and deliver on engineering goals.

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.

As a Senior Software Engineer, you will develop features for AI security capabilities, enhance workflows, and integrate systems while collaborating across teams.

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.

Design, develop, test, secure, integrate, and maintain enterprise applications; support CI/CD pipelines and DevSecOps practices; perform code reviews, troubleshoot production issues, integrate APIs, and collaborate with stakeholders in a classified or sensitive federal IT environment.

As a Senior Software Engineer, you will enhance our investment screening and fraud prevention platform, overseeing the software development lifecycle and collaborating with various teams for compliance-driven solutions.

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.

Design, implement, and scale event-driven, distributed backend systems in Python on AWS to process and enrich large-scale document and media datasets. Lead technical projects, mentor engineers, integrate ML/LLM components, optimize performance, maintain observability, and collaborate with Data Science, ML Engineering, and Product to deliver reliable high-throughput content processing services.

Lead design and evolution of Nubank's storage and database platforms (Datomic, provisioning, caching). Ensure performance, availability, regulatory compliance and multi-region resilience. Support country launches, run incident response, mentor engineers, and collaborate horizontally to deliver shared database infrastructure at scale.

Design, build, test, integrate, secure, and maintain mission-focused software for classified national security and law enforcement programs. Develop APIs, databases, features, and scripts; participate in Agile delivery, release preparation, production support, troubleshooting, and documentation. Mentor team members and drive modernization, automation, and technical debt reduction.

As a Senior Software Engineer, you will design and develop scalable software systems utilizing AI technologies, mentor junior engineers, and lead architectural discussions.

The Principal Software Engineer builds and scales data pipelines for threat intelligence, ensures production reliability, and drives architectural improvements while collaborating across teams.

The Staff Software Engineer will lead the long-term technical strategy for Nubank's credit card platform, ensuring scalability, mentoring engineers, and solving complex architectural challenges while maintaining compliance.

Lead design and implementation of enterprise observability and logging platforms. Architect scalable logging solutions, integrate observability into CI/CD and IaC, build automation and AI-native detection tools, manage data routing and integrations, conduct code reviews, mentor engineers, and collaborate cross-functionally to ensure reliable, performant systems.

Evaluate AI-generated coding interactions, assess quality of engineering judgments, provide feedback, and define standards for AI coding agents. Comfortable making subjective judgments about engineering quality.

The Staff Software Engineer will architect and build scalable solutions for Cloudera's Data Platform, contribute to Apache Spark, enhance engineering processes, and work with large-scale distributed systems.

As a Staff Software Engineer, you will lead the development of Apache Iceberg, enhancing data handling capabilities for large-scale systems, collaborating with teams, and architecting solutions for modern data lakes.

Design and maintain healthcare software integrations, ensuring data flow between Epic EHR and systems while mentoring developers and ensuring quality standards.

Lead the technical transformation of Nubank's Credit Card platform by architecting a unified system using Generative AI for operational efficiency and strategic migration across countries.

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.

Design and develop customer service platforms and systems. Collaborate across teams to enhance user experiences and integrate with external services.