Top Software Engineer Jobs in St. Louis, MO

Develop, document, unit test, integrate, and maintain software components for F-15 mission planning systems using C#, JavaScript, and SQL. Troubleshoot defects, collaborate on solutions, follow Agile/Scrum, and work under general supervision to compile builds and test components.

Design, develop, optimize and maintain ERP financial applications using Oracle and PL/SQL. Integrate systems, ensure security/compliance, resolve defects, lead code reviews, mentor junior developers, participate in Agile/Scrum, and estimate and deliver ERP features.

Lead design, architecture, and development of simulation models and frameworks; author requirements and software designs; integrate hardware/software in lab environments; coordinate multi‑team priorities, perform design reviews, and mentor engineers; serve as customer‑facing SME for Flight Simulation Labs products and ensure delivery of high‑quality integrated simulation capabilities.

Develop, test, and maintain embedded software for defense systems. Translate customer requirements into software designs, perform unit/integration testing, support system integration, review peer work, create interface definitions and documentation, and follow software architecture and open-architecture principles.

Design, develop, test, and maintain full-stack web applications, databases, and data processing tools for fleet health analytics. Collaborate with stakeholders, lead and coordinate cross-team development, perform troubleshooting and debugging, improve processes and documentation, apply system-level thinking, and mentor junior engineers in a mission-critical aerospace environment.

Design, develop, test, and maintain full‑stack web applications, databases, and data processing tools for model‑based sustainment simulations. Collaborate with stakeholders, lead or contribute to planning and code reviews, troubleshoot and optimize software, improve processes and documentation, and mentor junior engineers in an agile, mission‑critical aerospace environment.

Design, build, and maintain secure, automated CI/CD pipelines and infrastructure for safety-critical software. Automate tooling, deploy and monitor releases, integrate security controls, analyze and mitigate vulnerabilities, support cross-functional teams, and implement emerging technologies to enable scalable, compliant software delivery for defense aircraft health management.

Lead design, architecture, and development of simulation models and frameworks for flight simulation. Own software architecture, requirements, implementation, integration, and testing. Coordinate across hardware teams and multiple scrum teams, mentor engineers, perform design reviews, and ensure delivery of secure, high-quality simulation products for an Air Dominance program.

Develop software for autonomous systems, leading junior engineers, and performing software testing and integration. Must adapt to new environments and technologies.

The Software Developer will design, develop, and maintain software solutions for engineering and manufacturing teams, collaborating with stakeholders and participating in Agile processes.

The Software Engineer develops and maintains flight and subsystem control software for fighter programs, participating in the full development lifecycle including requirements, testing, and troubleshooting.

Design, develop, test, and maintain embedded application software for air-domain missions. Translate customer requirements into software architecture, perform unit/integration testing, support system integration and verification, participate in peer reviews, and produce software documentation while meeting safety, regulatory, and customer standards.

Provides technical leadership for enterprise full-stack applications and microservices using React, Node.js, .NET, and Azure. Leads legacy-platform modernization, cloud migration, data integration, messaging, SQL and Delta Lake architecture, AI-powered automation, frontend UI migration, security compliance, and technical debt reduction. Mentors cross-functional engineering teams and guides platform innovation.

The Software Engineer will develop and maintain software systems for the F-15 Mission Systems, focusing on real-time embedded software, collaborating in Agile teams, and integrating various aircraft functionalities.

The role involves designing, developing, testing, and maintaining non-embedded software for air domain missions, leading junior engineers, and conducting integration testing.

Design, develop, test, and maintain embedded software for weapons programs. Translate requirements into software designs, create interfaces, perform unit/integration testing, participate in peer reviews, support system integration and test, and produce software documentation.

Design, develop, test, and maintain embedded software for weapons programs. Translate requirements into designs, develop interfaces, perform unit/integration testing, support system integration, participate in peer reviews, and create documentation while meeting safety, security, and regulatory standards.

Maintain and improve GameChanger's backend API server and SDK. Implement API/SDK changes, improve developer ergonomics, optimize performance and scalability, design critical systems, document and mentor teammates, and participate in on-call rotation.

Lead a team of software engineers supporting critical retail-banking applications. Design and develop software solutions, provide technical guidance, review code and documentation, troubleshoot complex incidents, and apply SRE practices. Maintain on-call rotation for after-hours critical incidents. Use OpenShift, Hogan, Dynatrace, and Linux; collaborate on releases and modernize application delivery.

Lead design and implementation of backend systems for Model-Based Engineering web applications. Build APIs, data-processing and analytics pipelines, optimize SQL, develop production-ready infrastructure, create test suites, mentor engineers, participate in architecture and tech selection, and ensure scalability, resilience, and performance for large-scale distributed systems.

Design and implement secure, scalable backend services for voice agents, integrate AI models and telephony, improve inference, debug concurrent systems, and collaborate with Product to deliver features end-to-end.

Build and independently deliver full-stack healthcare software features using Java or Groovy, React and TypeScript, MongoDB, and Kafka. Responsibilities include design, implementation, testing, deployment, production debugging, code reviews, design documentation, dependency coordination, process improvements, and mentoring. The role requires reliable delivery with minimal oversight and collaboration across engineering, product, and QA teams in a remote-first environment.

Design, architect, and develop simulation models, virtual environments, and frameworks. Validate, integrate, modernize, and test simulation software and legacy systems, collect and process data, document algorithms and specifications, and collaborate with cross-functional teams to enable system integration and optimize performance in a secure Agile environment.

Develop and ship full-stack web and mobile experiences across Affirm’s consumer app and website. Collaborate with product, design, analytics, and engineering teams to break down projects, make technical decisions, write tested and extensible code, launch scalable APIs, monitor service health, support on-call operations, review code, and participate in team development and interviewing.

Build SDKs, self-service apps, and reusable abstractions for Coinbase's data platform. Develop data integration and processing tools, enable observability and security (cataloging, lineage, access controls), and collaborate with analysts, data scientists, and engineers to scale and operationalize data pipelines and models.