Top Software Engineer Jobs in St. Louis, MO

Designs, develops, tests, integrates, debugs, and sustains non-embedded software for military platform health management systems. Translates customer requirements into software architectures and implementations, supports CI/CD and Agile development, manages interfaces and documentation, troubleshoots user issues, improves software processes, and contributes to research, project management, supplier oversight, compliance, and certification activities.

Develops and maintains weapon-planning software for a Department of Defense mission-planning system. Responsibilities include coding, unit testing, software design, defect troubleshooting, requirements support, build integration, component testing, operational issue resolution, documentation, and metrics collection. The role uses C#, TypeScript, JavaScript, React, microservices, and Agile/Scrum practices within a software development team.

Develops and maintains mission-planning software for Department of Defense programs within a Scrum team using SAFe Agile. Responsibilities include software design, coding, testing, integration, troubleshooting, documentation, requirements analysis, architecture support, and lifecycle maintenance. The role uses TypeScript, React, C#, microservices, and related technologies to deliver reliable, secure, mission-critical systems.

Develops and maintains mission-planning weapon software for the Department of Defense using microservices, TypeScript, React, and C#. Responsibilities include requirements analysis, architecture and interface documentation, software integration, debugging, testing, process improvement, and collaboration within an Agile Scrum team. The role requires defense-oriented software development experience, secure coding knowledge, testing expertise, version control, and the ability to obtain a U.S. Secret clearance.

Designs, develops, tests, maintains, and integrates non-embedded software for the Tomahawk missile program. Translates customer requirements into software designs, resolves technical issues, supports users, implements modern development technologies, and documents software research and development while meeting safety, industry, and government standards.

Develop and deploy data solutions using Palantir Foundry and AIP for client engagements. Lead technical teams, coach team members, analyze system interactions, build applications with large datasets, and apply data engineering and analytics to deliver client outcomes. The role also includes managing client relationships, planning and executing projects, encouraging technology adoption, resolving stakeholder conflicts, and driving continuous improvement.

Leads the development and deployment of data solutions using Palantir Foundry and AIP. Manages engineering teams, coaches team members, oversees project planning and execution, analyzes system interactions, manages client relationships, and drives innovation. The role applies software engineering, data engineering, analytics, and AI/ML techniques to deliver scalable client solutions while maintaining technical and professional standards.

Leads the development and deployment of software and data solutions using Palantir Foundry and AI/ML technologies. Responsibilities include data engineering, analytics, system improvement, client account management, project ownership, team leadership, coaching, stakeholder engagement, and continuous improvement. The role requires building scalable applications with large datasets and delivering customer-focused solutions.

Develop and maintain legacy and modern Windows-based flight test data processing applications using C++ and C#. Responsibilities include software development, testing, troubleshooting integration issues, researching technologies, collaborating with users and teams, and improving code quality. The role supports instrumentation setup, real-time monitoring, post-test data processing, visualization, and analysis for flight test operations.

Develops and maintains simulation models, visualizations, virtual environments, and infrastructure supporting F-22 software and hardware development and testing. Responsibilities include requirements analysis, simulation design, coding, data processing, verification and validation, test execution, documentation, hardware integration, and modernization of legacy systems. The role collaborates with cross-functional engineering teams in an agile environment and supports real-time simulation frameworks, operating systems, networks, and emerging technologies.

Develop and maintain scalable Python software, integrations, and web applications. Collaborate with QA, IT operations, analysts, and stakeholders in an Agile/Scrum environment. Design technical solutions, translate workflows into requirements, participate in code reviews and Scrum ceremonies, optimize relational and non-relational database queries, troubleshoot production issues, and improve application performance and security.

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.

Develop and prototype sensor-fusion algorithms for tactical aircraft network operations using mathematical and statistical techniques. Analyze multimodal sensor data, apply Kalman filtering and probabilistic models, evaluate algorithm performance, document requirements and analyses, and transition successful prototypes into production software. Collaborate with software architects and customers on algorithm design and requirements. The role requires a bachelor’s degree, relevant sensor-fusion experience, U.S. citizenship, and ability to obtain a Secret clearance.

Develops and maintains software for flight simulation infrastructure, including simulation tools, subsystem message monitoring, aircraft capability models, and testing environments. Responsibilities include architecture, requirements, algorithms, interfaces, coding, software integration, documentation, research, and Agile collaboration. The role supports Mission Systems engineers and requires programming experience, a bachelor's degree, U.S. Person status, and eligibility for a post-start Secret clearance.

Develops and maintains simulation software, models, visualizations, virtual environments, and frameworks for software and hardware verification. Responsibilities include requirements analysis, simulation design, testing, data processing, validation, documentation, system integration, modernization, and project support. The role collaborates with engineering teams using Agile methodologies and supports multiple Boeing programs across commercial and defense applications.

Develop and deploy enterprise applications using Python and C# across Oracle, SQL Server, and SQLite environments. Build CI/CD pipelines, Docker solutions, deployment scripts, automated tests, APIs, monitoring tools, and AI-powered automations. Provide production triage and print-facility support, document solution designs, participate in peer reviews, mentor engineers, and collaborate with operational and cross-functional teams.

The Founding Engineer will lead the development of Sailor Health's AI-powered platform, building systems for patient care and mentor the engineering team.

Lead the development of an AI-powered platform for senior mental health, building systems for patient experience, and mentoring the engineering team.

Build the core AI platform for an AI-native trading experience. Develop a high-performance Rust backend supporting streaming responses, low-latency tool execution, caching, and model orchestration. Design secure, observable APIs and runtime components with authentication, authorization, rate limiting, auditing, tracing, retries, and fallbacks. Build safe trading action infrastructure with deterministic previews, confirmations, idempotency, and audit logs while partnering with product and frontend teams.

Own and improve Hex’s cloud infrastructure, CI/CD, observability, databases, security, cost management, and single-tenant deployment systems. The role involves selecting and delivering infrastructure projects, operating Kubernetes and AWS environments, scaling PostgreSQL, implementing infrastructure as code, and building customer-facing platform capabilities. Engineers are expected to handle on-call responsibilities, write application code when needed, and independently turn ambiguous infrastructure problems into shippable solutions.

Develop and maintain mission-planning software for Department of Defense programs as part of a SAFe Agile scrum team. Responsibilities include software design, development, testing, debugging, systems integration, architecture and requirements documentation, troubleshooting, and process improvement. The role uses TypeScript, React, C#, microservices, and related software engineering practices while collaborating with product owners, systems engineers, hardware engineers, and program managers.

Provides technical leadership on complex, high-impact engineering projects from design through launch. The role involves architecture, company-wide initiatives, engineering excellence, mentoring technical leaders, and establishing standards for scalable, reliable, secure, observable systems. The engineer will collaborate across teams, communicate complex technical topics, and apply customer-focused decision-making and A/B testing techniques.

Build and ship backend features end-to-end using Ruby on Rails and SQL. Lead complex technical projects, solve architecture challenges, establish standards, conduct meaningful code reviews, resolve high-risk bugs, document systems, collaborate across engineering teams, and mentor junior engineers.

Supports mission-planning software development, integration, testing, maintenance, debugging, and systems integration for defense programs. Assists with software architecture, requirements, algorithms, interfaces, documentation, and process improvement throughout the software lifecycle. Requires C#/.NET development experience, Agile experience, version-control proficiency, a bachelor’s degree, and an active U.S. Secret clearance.

Build a high-performance frontend data platform for exploring and analyzing hardware telemetry. Develop React and TypeScript applications, interactive time-series visualizations, data visualization plugins, complex application state management, and LLM-assisted analysis workflows. Collaborate directly with hardware engineers and customers to define interfaces, prototype workflows, demonstrate features, and incorporate feedback into product development.