Top Senior Software Engineer Jobs in St. Louis, MO

As a Software Engineer, lead full-stack development, mentor engineers, and design secure microservices for geospatial applications. Collaborate with teams to meet compliance and performance needs.

Design and build scalable, reliable backend systems and third-party integrations for provider-patient workflows and telehealth. Drive development lifecycle, solve complex technical challenges, and collaborate cross-functionally to ensure performance, security, and availability.

The Senior Software Engineer will drive the retail technology initiatives at Toast, focusing on payment solutions and enhancing customer experiences. Responsibilities include collaborating on high-impact opportunities, technical decision-making, and adapting to customer needs.

Design, implement, and improve significant features in HCSS products. Analyze product architecture and databases for ROI-driven improvements. Lead code reviews, mentor junior developers, collaborate to enhance infrastructure, reliability, and CI/CD practices.

The Staff Frontend Engineer will design and implement complex frontend systems, lead engineering efforts, and collaborate with cross-functional teams to deliver a sophisticated SaaS platform.

As a Senior Software Engineer, you'll implement collaboration features, support team architecture, work across tech stacks, and improve developer experience.

The Senior Software Engineer will build scalable backend systems, maintain data workflows, and collaborate across teams to enhance marketing initiatives.

As a Staff Software Engineer, you'll lead AI-powered product delivery, shape platform architecture, and drive initiatives like advertising systems and AI-generated content.

Build full-stack features for a web-based broker platform serving Medicare customers. Work across frontend and backend, influence architecture, reduce technical debt, collaborate with product and design, use AI-powered developer tools, and mentor engineering best practices to scale the platform.

Senior Software Engineer responsible for designing, building, and maintaining the loans platform. Collaborate with product and cross-functional teams to deliver reliable, scalable, and secure services; mentor engineers; improve system performance, observability, and deployment practices.

As a Senior Software Engineer, you'll design, develop, and maintain full-stack applications, utilizing TypeScript and modern frameworks while collaborating cross-functionally to enhance user experience and performance.

Provide technical leadership for internal platforms and security automation supporting Upstart Bank. Lead architecture, design, and implementation of platform services, APIs, relational schemas, authentication and RBAC systems. Partner with risk, compliance, and operations stakeholders, mentor engineers, mitigate technical risks, and drive long-term platform strategy and engineering standards.

Design, build, and maintain internal software platforms, APIs, integrations, and data workflows that support risk, compliance, legal, and bank operations. Translate stakeholder requirements into scalable architectures, relational data models, authorization and audit systems, and background processing. Produce technical designs, documentation, and contribute to platform-wide architecture and build-versus-buy decisions.

As a Senior iOS Engineer, you'll lead engineering decisions, ship production code for the Speechify iOS app, and enhance the existing app architecture, all while contributing to a high-growth, fast-paced startup.

The Staff Software Engineer will lead design, development, and mentoring in building Embedded Finance capabilities while ensuring high-quality production services.

The role involves developing React Native applications for iOS and Android, collaborating with teams, mentoring developers, and ensuring high-quality code and testing practices.

The Senior Software Engineer will lead projects for the Forms platform, designing and building features across web, mobile, and backend systems while mentoring other engineers and improving platform scalability and reliability.

Lead quality assurance and test strategy across Agile teams, drive automation for testing, mentor QA teams, and ensure high-quality software delivery.

As a Software Engineer at Vercel, you will enhance and improve the CDN's performance, analyze web latency, and support a team of developers working primarily in Lua.

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.

The Senior Software Engineer will design and develop scalable applications, enhance DevOps practices, and drive continuous improvement within infrastructure and systems.

This role involves leading web platform initiatives, mentoring senior engineers, architecting web applications, and implementing technical strategies for improved performance.

The Senior Software Engineer will lead the development of payment systems, oversee key subsystems, mentor engineers, and ensure high-quality code and architectural standards while collaborating with cross-functional teams.

The Senior Software Engineer will lead and support a team in developing reliable and scalable backend systems, collaborating on product development, and improving infrastructure for secure communication between services.

Lead and build a new Trust & Safety engineering domain: design and implement systems to detect and mitigate fraud, billing anomalies, and credential abuse. Architect product and operational solutions, mentor engineers, define processes, and deliver scalable, auditable safety tooling across internal and external workflows.