Top Software Engineer Jobs in St. Louis, MO

Build and own shared architecture, infrastructure, state-management patterns, testing systems, and developer tooling for a React Native mobile application. Deliver customer-facing features, integrate APIs and third-party services, resolve iOS and Android issues, optimize performance, and improve AI-assisted engineering workflows. Mentor engineers, review code, guide platform adoption, maintain reliability standards, and participate in production support and on-call rotations.

Build and operate production custody systems: signing service, key management, chain integrations, and transaction pipelines. Own end-to-end subsystems, integrate new chains, collaborate with cryptography on threshold signing and key recovery, write post-mortems, and produce clear async design docs and PRs.

Design, build, and maintain backend services and APIs using Ruby on Rails. Improve performance, scalability, reliability, and write well-tested production code. Collaborate with Product, Frontend, Data Engineering, and QA teams.

Design, build, and maintain backend services and APIs using Ruby on Rails. Ensure performance, scalability, reliability, and test coverage. Collaborate with Product, Frontend, Data Engineering, and QA to deliver production-quality code for web and mobile platforms.

Senior full-stack developer to build scalable SAP BTP applications using Node.js, CAPM, and SAP UI5/Fiori; integrate with S/4HANA and third-party systems; optimize performance, ensure secure deployments, and follow Agile practices.

Design, develop and support cloud applications using Cloud Foundry and Node.js. Apply object-oriented design and SQL (HANA). Work with APIs and eventing, use VS Code. Prefer SAP CAP/BTP and SAP experience. Collaborate in agile/SCRUM teams, communicate effectively, take ownership, and ensure high quality.

Volunteer Principal Front End Developer to build React/React Native web and mobile features, mentor engineers, implement scalable full‑stack solutions, ensure cross‑browser compatibility and testing, work with Node/MongoDB/AWS, attend weekly standups, and support a fundraising launch. Minimum 4 hours/week commitment.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Build and scale Flywheel’s AI-native content platform as its first technical hire. Responsibilities include backend systems, data pipelines, content-generation workflows, web scrapers, integrations, AI product experiences, and customer-facing interfaces. The role requires end-to-end ownership, production LLM experience or rapid learning ability, strong product judgment, and comfort working directly with founders and users in an in-person London environment.

Design, build, test, and maintain backend services, APIs, and web applications. Translate product requirements into technical solutions, write maintainable and tested code, participate in reviews, debug production issues, improve reliability and developer experience, and collaborate with product, design, and QA teams. The role offers mentorship and increasing ownership for early-career engineers.

Design, develop, and maintain scalable Python applications; collaborate with cross-functional teams to deliver features; ensure performance and quality; identify and fix bugs; maintain code quality and automation; lead and mentor team members using agile practices.

Build and own frontend applications for DeFi products using Next.js and TypeScript. Develop reusable component libraries and design systems, integrate Solana programs and wallet infrastructure, and translate complex financial concepts into accessible interfaces. Own performance, reliability, observability, testing, analytics, and end-to-end feature delivery while collaborating with protocol engineers, designers, and product teams.

Leads and grows the engineering team, oversees customer implementations and product delivery, manages stakeholders, balances customization with core product development, and establishes engineering quality and reliability practices. The role also remains hands-on with TypeScript and Node.js coding, code reviews, debugging, and production support. Experience with AI products, healthcare workflows, HIPAA, EHR integrations, and early-stage startups is valuable.

Own customer-facing product development for Clara by supporting live accounts, translating stakeholder needs into product improvements, and shipping customer-specific changes. Build and modify conversational AI strategies, tune prompts and call flows, support onboarding and EHR integration discovery, coordinate go-lives, troubleshoot issues, and improve internal tooling and processes. Collaborate closely with customers, sales, clinical operations, compliance, customer success, and engineering teams.

Design and implement backend features in Go, build data pipelines and REST APIs, work with PostgreSQL and AWS, contribute to scalable system design, and optionally develop React.js user-facing features while collaborating in a fast-paced AI-focused startup.