Top Senior Software Engineer Jobs in St. Louis, MO

The Back-End Software Engineer at Boeing will lead the development of prototypes and production-level web applications, focusing on APIs, data processing, and system architecture while mentoring team members.

Design, architect, implement, and test simulation software and virtual environments for flight trainers. Lead integration, validation, and documentation of simulation models, mentor junior engineers, support proposals, and work within agile teams to deliver simulation subsystems and tooling for training systems.

The Software Engineer will design and develop simulation software, perform testing and analysis, and support various engineering teams in simulation integration.

Develop and maintain Vehicle Management System software, ensuring flight and subsystem control, while providing technical leadership and support throughout the software lifecycle.

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.

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.

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, implement, and operate large-scale distributed storage systems ensuring data durability, availability, and performance. Build and maintain replication, erasure coding, and lifecycle systems; write high-quality Go/Rust/C++ code; participate in on-call rotations; troubleshoot production incidents; collaborate with networking, hardware, and capacity teams; lead scoped projects and drive infrastructure evolution.

As a Billing & Analytics Software Engineer, you'll design and maintain the billing pipeline, integrate billing systems, and develop customer-facing analytics dashboards to support revenue recognition and operational observability.

Design and re-architect the Identity systems at Dropbox to support multi-product capabilities, mentor junior engineers, and ensure software excellence.

The Software Engineer will enhance developer experience at Benchling by building production release tooling, improve workflows, and collaborate with teams to scale processes. Responsibilities include developing efficient development tools and championing engineering patterns.

Manage clusters, develop with Golang, provision infrastructure with Terraform, and enhance performance of the platform handling untrusted code.

The role involves leading application performance improvements across multiple platforms, focusing on measurable metrics and driving engineering standards and workflow optimization, using both hands-on coding and strategic influence.

Design and implement CIAM backend services for authentication and authorization. Integrate identity systems, manage secure flows, and automate infrastructure.

Build and maintain web platforms for restaurant discovery, onboarding, and data quality. Collaborate with engineers, PMs, designers, and researchers; work full-stack when needed; ship impactful features; run experiments with guests and restaurants; champion development, deployment, and quality best practices.

Seeking a Software Engineer/Senior Software Engineer to design, develop, and deliver quality backend services and APIs using Go, with emphasis on Kubernetes and cloud services.

Design, develop, test, and maintain non-embedded software for the Tomahawk program. Translate requirements into software designs, implement features, troubleshoot issues, and document R&D. Ensure compliance with government and safety standards and support system integrations.

As a Fullstack Software Engineer, you'll design, develop, and maintain scalable frontend and backend systems while collaborating across teams.

Lead Software Engineer responsible for software design and development for defense-related projects, mentoring junior engineers, and ensuring project alignment with requirements and standards.

Lead and manage a team of software verification engineers to design, develop, and execute requirements-based test plans and automated test frameworks. Perform functional, performance, and safety verification, report defects, and support formal qualification testing. Coordinate with program management, systems engineers, and developers in an Agile, CI/CD-driven environment for defense flight systems.

Lead architecture, provisioning, and optimization of on‑prem and cloud lab/test environments using IaC and DevSecOps. Drive automated integration testing, scalable deployment pipelines, observability, and security/compliance. Mentor engineers, coordinate cross-organizational stakeholders, and deliver data‑driven recommendations to improve stability and integration across programs.

The Senior Software Engineer will design, develop, test, and maintain weapon planning software using Agile methodologies, focusing on mission-critical systems for defense programs.

Build and own Eve's marketing site and GTM engineering stack: integrate and optimize external tools, design AI agents for sales and marketing, implement webhooks and middleware to sync product/CRM data, and create programmatic campaigns and internal tools in partnership with Marketing, Sales, RevOps, and Product to drive growth and automation.

Designs, develops, and deploys AI-driven, cloud-native applications on Azure. Builds RAG knowledge systems, AI agents, secure APIs, and orchestrated workflows using C#, .NET, Azure services, Docker, and CI/CD. Collaborates with stakeholders, ensures observability and security, supports production incidents, and provides documentation and knowledge transfer.

Design and develop complex software solutions for the FedNow service, leveraging cloud technologies, Java, and Agile methodologies, ensuring high-quality and timely infrastructure support.