Top Software Engineer Jobs in St. Louis, MO

Develop, maintain, enhance, and support a mission-critical federal Java application for HUD servicing, accounting, reporting, and compliance. Build full-stack interfaces and REST APIs, optimize SQL and database workflows, troubleshoot production issues, participate in Agile development and releases, support testing and deployments, document procedures, and contribute to modernization and technical debt reduction. The role collaborates with product, QA, database, infrastructure, configuration management, and security teams.

Own and evolve Argo Workflows and Argo Events, make major architectural decisions, and build Pipekit’s enterprise control-plane product. The role includes shaping the roadmap, shipping customer-focused features, engaging with open-source contributors and customers, participating in an on-call rotation, and speaking at cloud-native conferences. Candidates should have strong statically typed programming skills, Kubernetes expertise, production-systems experience, excellent written communication, and a self-directed, customer-focused approach.

Own PayBox end to end as a founding-style staff engineer, taking the AI payments product from problem definition through production and iteration. Build payment, peer-to-peer transfer, AI platform, application, and ecosystem integrations. Improve onboarding and UX, make pragmatic architectural decisions, collaborate with Product, and use AI tools while maintaining strong independent technical judgment.

Full‑stack product engineer role with backend emphasis: build scalable Node.js services, develop React + TypeScript UIs (React Router v7), design APIs (tRPC/OpenAPI), optimize PostgreSQL queries and data pipelines, improve observability and infrastructure, write well‑tested code, and contribute to architecture and engineering practices in a fintech product.

Build and ship end-to-end features for Dover's marketplace and ATS. Propose product ideas, implement designs, launch, iterate in production, and collaborate closely with a small engineering team to move quickly and maintain high quality.

Work as a Python development intern building applications and APIs, processing and analyzing data, working with databases and data pipelines, contributing to system architecture, writing clean documented code, and collaborating with the team. Strong emphasis on backend development, SQL, ORMs, and REST API design with potential conversion to full-time.

Design, develop, and maintain scalable backend services and APIs (Node.js, Firebase). Optimize performance, ensure code quality via reviews and unit tests, debug and upgrade systems, and contribute to frontend work as needed. Stay current on backend and Gen AI integrations and collaborate across the team.

Design, build, test, deploy, and troubleshoot integrations between Vividly and customer ERP, banking, and other systems. Translate accounting workflows into technical designs, define mappings and transformations, lead technical discovery, support customer UAT, document solutions, and resolve production issues. The role also develops reusable integration patterns, improves APIs and integration frameworks, and advises customers and internal teams on technical architecture and system constraints.

Own end-to-end supplier integrations: design, implement, test, and monitor third-party APIs. Ship weekly, improve tooling and abstractions, ensure reliability, and mentor peers. Use AI-assisted workflows to speed integration development.

Own and advance Yahoo’s enterprise Node.js development environment, including runtimes, packages, container images, internal integrations, and CI/CD workflows. Manage runtime lifecycles, security updates, dependencies, releases, testing, automation, and troubleshooting. Support GitHub Enterprise and GitLab Enterprise while integrating AI programming tools to improve developer productivity. Partner across engineering and security teams, and document platform changes, migrations, and deprecations.