Top Senior Software Engineer Jobs in St. Louis, MO

Develop, integrate, verify, and maintain C/C++ software for real-time embedded Vehicle Management Systems on advanced defense platforms. Responsibilities include architecture and requirements development, software and verification planning, testing, process improvement, technical leadership, project tracking, standards compliance, and mentoring engineers. The role is fully onsite in Berkeley, Missouri, supports flight hardware, and requires an active or obtainable U.S. Secret clearance and U.S. citizenship.

Develop, integrate, test, and maintain real-time Vehicle Management System software for aerospace platforms. Produce architectures, requirements, algorithms, and verification artifacts; lead technical efforts, mentor team members, and ensure compliance with safety and industry standards.

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.

Leads software testing for Boeing mission systems, developing test plans, verification procedures, test environments, and testing strategies across emulation, simulation, development kits, and hardware. Ensures requirements compliance, safety- and mission-critical testing, software process adherence, and coordination across technical and systems teams. Executes and documents testing, supports research and development projects, and mentors other engineers. The role is fully onsite in Berkeley, Missouri, and requires an active Secret clearance and U.S. citizenship.

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.

Own performance optimization, reliability, observability, capacity modeling, and automated failover for Coinbase’s blockchain node infrastructure. Diagnose resource bottlenecks, reduce infrastructure costs, define SLOs and SLIs, support protocol upgrades, and improve node performance across distributed systems at scale. Collaborate with protocol integration, wallet, and indexer teams while applying backend programming and systems profiling expertise.

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

Leads mission-critical software architecture, design, implementation, integration, verification, and lifecycle maintenance. Ensures compliance with software processes, policies, reference architectures, and industry standards. Coordinates across Mission Systems teams, supports containerized architecture, executes research and development projects, collaborates on testing, and mentors engineers. The role is fully onsite in Berkeley, Missouri and requires an active Secret clearance, SAP access eligibility, U.S. Person status, and successful completion of a technical assessment.

Leads infrastructure, tooling, build strategies, and architecture roadmaps for mission systems software across multiple security levels. Ensures software testing, compliance, policy enforcement, and adherence to safety and mission-critical standards. Coordinates with technical leads, Mission Systems teams, suppliers, and labs; plans and documents research projects; and mentors software personnel. The role is fully onsite in Berkeley, Missouri, supporting Boeing Defense, Space & Security.

Lead architecture, provisioning, and optimization of on-premises and cloud lab/test environments. Drive CI/CD and deployment pipelines, integration testing workflows, observability, security/compliance (CIS, NIST, SOC 2, FedRAMP), and mentor engineers. Act as technical liaison across programs and external partners to ensure scalable, secure, repeatable lab operations and data-driven insights.

Lead Site Reliability Engineer responsible for driving stability, resiliency, performance, and security of enterprise platforms. Define SLIs/SLOs, implement observability and automation, lead incident management and toil reduction, advise leadership, enforce reliability standards, and collaborate across development, product, and operations to ensure high availability and continuous improvement.

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

Lead UI architecture and design for responsive web applications; build reusable components with Angular/React/Vue and TypeScript/JavaScript; integrate UIs with RESTful microservices; enforce accessibility, security, testing, and CI/CD standards; mentor developers and collaborate with UX, backend, and DevOps teams in Agile environments.

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

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.

Build and expand fintech and payment systems using Go, microservices, databases, and cloud technologies. Design production APIs and tooling, diagnose customer issues, manage full release lifecycles, document systems, and mentor engineers. Collaborate with product and business teams while guiding AI agents to produce maintainable, observable, testable code that meets engineering standards. Work independently in a high-availability environment and contribute to next-generation financial products.

Provides architectural and technical leadership for institutional exchange systems, including matching engines, order management, market data, risk, and unified trading platforms. Leads ultra-low-latency distributed-system design, cross-team technical alignment, reliability standards, incident response, and multi-quarter initiatives. Maintains hands-on engineering contributions while mentoring senior engineers and developing technical leadership across teams.

Design, implement, and maintain partner integration solutions; translate partner requirements into scalable technical implementations; troubleshoot and automate fixes; collaborate with product and engineering teams to improve tools and ensure successful partner onboarding and launches.

Lead design and delivery of scalable customer-facing features, services, and APIs that process real-time data and AI-powered insights. Build web experiences, contribute to LLM/AI workflows, ensure reliability through observability and rollout practices, and collaborate cross-functionally with Product, Design, ML, and platform teams.

Lead technical strategy, build and maintain software systems using AI, mentor early-career engineers, collaborate across disciplines, and protect user privacy and security. The role involves developing scalable systems on AWS and Kubernetes while working with healthcare data and adhering to HIPAA and data-security best practices.

Build and operate high-throughput backend services powering AI agent orchestration, connector integrations, and real-time data pipelines. Design scalable core platform services, collaborate with ML, frontend, and product teams, implement infrastructure-as-code and CI/CD, and mentor junior engineers to deliver reliable, AI-powered features.

Design and build reliable backend services and integrations for Coinbase’s Unified Merge Gate. Lead automated code review, policy evaluation, CI evidence, authorization, merge controls, repository migrations, safe rollouts, observability, and operational ownership. Partner with Security, Compliance, Infrastructure, and engineering teams to improve software review and deployment workflows while measuring merge quality, review volume, time-to-merge, and escaped defects.

Design, scope, and implement scalable backend and platform solutions for a reservations and waitlist product. Improve performance and usability, collaborate with Product and Design, identify high-impact opportunities, and contribute across the stack including APIs and front-end integration.

Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.

Architect and re-engineer highly scalable, resilient backend data systems supporting patient services. Lead distributed systems strategy, make architectural decisions, improve performance and reliability, mentor engineers, establish operational practices, and collaborate with product managers and cross-functional stakeholders to shape engineering and product direction.