Top Senior Software Engineer Jobs in St. Louis, MO

The Senior Software Engineer at LearnLux will build scalable backend systems for an enterprise SaaS platform, collaborating across teams and tackling complex technical challenges. Responsibilities include developing cloud infrastructure, improving system reliability and security, and enhancing engineering practices with AI-driven tools.

As a Senior Software Engineer, you'll lead efforts to improve configuration management and tackle challenges in identity and access management while promoting a culture of clean code and effective architectural solutions.

As a Senior Software Engineer, you will design and implement AI technologies to address complex logistics challenges and mentor team members.

The Senior Software Engineer will develop backend systems, mentor engineers, and collaborate with cross-functional teams while contributing to product features and roadmaps.

Build and maintain performant, accessible frontend interfaces using modern component architecture and AI-driven features. Integrate REST APIs and LLM services, use agentic development tools, participate in code reviews, contribute to CI/CD with Azure DevOps, monitor frontend performance with Azure App Insights, and collaborate with Product and Design.

Design, implement, and optimize core frontend, backend, and model-integration components. Drive engineering direction, ship and scale LLM-powered applications, build robust APIs and streaming systems, establish CI/CD and instrumentation, and deliver production-grade agentic workflows with measurable reliability and performance.

The Senior Software Engineer will develop and maintain big data applications, focusing on distributed computing, automation, and collaboration with teams to enhance healthcare solutions.

The Senior Software Engineer II will architect, build, and operate core services for the company's cloud infrastructure. Responsibilities include designing scalable platform services, leading operational design for reliability, building automation for self-healing systems, and collaborating across engineering and security teams.

Develop core backend components for a blockchain network, focusing on reliability and scalability, mainly using Rust. Ensure code quality through testing and debugging.

Design, build, and deploy scalable cloud-based solutions; translate product requirements into technical architecture; contribute to roadmaps, code, and reviews; shape engineering practices and culture in a fast-paced startup.

The Senior Software Engineer will develop features for Phantom's web platforms, lead new product initiatives, interface with users, and contribute to team culture.

Design, build, and scale backend systems for a publishing platform. Lead development, ensure system health, and promote engineering standards.

As a Senior Software Engineer, you'll design modern scalable platforms, focusing on front-end and back-end development using VueJS/ReactJS and C# microservices, while integrating with AWS and modern data warehouses.

The Senior Software Engineer will build and operate systems for Vanta's FedRAMP environments, focusing on reliability, compliance, and incident response, while collaborating with product teams and improving operational readiness.

As a Senior Software Engineer, you will develop solutions for improving support agent experience, focus on backend components, and collaborate with cross-functional teams.

As a Senior Software Engineer, you will develop scalable applications, collaborate with teams, and improve code quality while maintaining backend system reliability.

Lead development of Dutchie’s cross-platform mobile apps using Flutter, delivering customer-facing features from design through deployment. Optimize performance, accessibility, and cross-platform consistency, collaborate with product and design, improve code quality and developer experience, and act as a technical leader on the mobile team.

Lead front-end development for the Brands team: design and implement React/TypeScript UIs, ensure comprehensive testing and monitoring, collaborate on product definition, and iterate from customer feedback. Mentor peers and improve team processes.

Lead design, build, and maintain CRM and MarTech integrations and services; lead technical discovery and execution; mentor engineers; collaborate with marketing and cross-functional teams; ensure system stability and participate in on-call rotations.

Design and build backend functionalities for Temporal's high-availability services, ensuring reliability and scalability across cloud environments. Document processes and maintain service metrics.

Develop new features, fix bugs, refactor codebase in a TypeScript/React environment, collaborate with teams to meet user needs, and contribute to team culture.

As a Staff Software Engineer, you will architect and scale AI/MCP Server and Gateway for multi-agent workflows, ensuring reliability and performance while collaborating with cross-functional teams.

Design and deliver features for the Ready-to-Build product, collaborate with sales and implementation teams, maintain and test code, enhance platform functionality.

As a Senior Software Engineer, you will design and develop high-quality payment systems, improve client transaction processing, mentor engineers, and ensure security and compliance in financial software.

Design and build infrastructure for AI agent systems, focusing on high-performance Rust services and reliable ML infrastructure for large-scale production environments.