Top Software Engineer Jobs in St. Louis, MO

Develop and deploy automated system tests for distributed software environments. Collaborate with developers and QA teams, create test plans, verify requirements and coverage, troubleshoot features, improve testing methodologies, and solve large-scale automation and verification problems using software development and related internet technologies.

Lead architecture and roadmap for Azure PostgreSQL systems; design and review scalable, maintainable database engine features (query processing, storage, transaction logging, recovery, versioning, IO, scale-out). Influence coding standards and run code reviews, write proof-of-concept or production code, contribute to open-source PostgreSQL/Linux, and participate in rotational on-call operations.

Own backend and AI infrastructure for autonomous trading agents. Build the Go-based agent runtime, execution and data layers, real-time trading systems, deployment platform, model hosting migration, telemetry, CI/CD, monitoring, and incident response. Develop production services primarily in Go, Python, and TypeScript while operating AWS EKS infrastructure. The role requires end-to-end ownership of reliable, low-latency systems managing real-time trading and financially sensitive positions.

Own the architecture and delivery of mission-critical backend projects for a secure crypto wallet infrastructure platform. Define database, microservice, and integration architecture; resolve performance and reliability issues; improve CI/CD, observability, and engineering processes; shape technical strategy; mentor engineers; and support client discussions. The role requires deep backend, cloud, database, security, and applied cryptography expertise, with leadership experience in fintech or blockchain.

Build and maintain secure, scalable APIs, backend services, platform infrastructure, and cloud systems for a Web3 wallet infrastructure provider. Responsibilities include designing resilient distributed systems, improving performance and availability, implementing monitoring and security controls, managing releases, writing comprehensive tests, resolving complex issues, documenting solutions, supporting customers, and collaborating across technical and business teams.

Architect and build the Solver framework powering NEAR Intents, including solver competition, quote aggregation, execution workflows, and cross-chain infrastructure. Lead technical design, code reviews, architectural decisions, and globally distributed collaboration while ensuring low-latency, high-throughput performance. Shape solver economics and cryptoeconomic incentives, remain hands-on with coding and prototyping, and address complex distributed systems and blockchain challenges.

Design, develop, test, implement, maintain, and support custom web applications and software solutions involving internet security, content delivery, APIs, and cloud computing. Build new applications and platform capabilities, improve existing functionality, contribute to automated unit, functional, integration, and end-to-end testing, and troubleshoot distributed systems and web services.

Develop automated software tests and system-wide automation infrastructure for distributed systems. Collaborate with developers and QA teams, create tests replicating real-world scenarios, improve testing methodologies, validate requirements and test coverage, and solve large-scale distributed systems problems using coding and related internet technologies.

Develop and deploy automated system tests for distributed systems, improve testing methodologies, validate test plans and cases, and collaborate with developers and QA teams. The role involves software QA, test automation framework development, root cause analysis, functional, stability, integration, and performance testing, plus solving large-scale systems testing challenges using programming and related internet technologies.

Design, develop, test, implement, maintain, and support custom web applications focused on authentication, authorization, and identity products. Build new applications and platform capabilities, improve existing functionality, automate product processes, and contribute to unit, functional, integration, and end-to-end testing. Collaborate on software architecture and development within agile teams while supporting solutions in laboratory and QA environments.

Principal frontend-focused software engineer responsible for leading frontend architecture, standards, tooling, accessibility, performance, testing, and deployment practices. The role delivers scalable customer-facing web applications, component libraries, and design systems using React or Angular. It includes cross-functional product collaboration, technical decision-making, mentoring, modernization initiatives, and occasional full-stack work. The position is remote, requires U.S. citizenship, Public Trust 6C eligibility, and approximately 0–10% business travel.

Develop and lead automated testing for software features and major releases on Agile teams. Design object-oriented automation frameworks, automate tests using Python or similar languages, perform white-box, black-box, functional, and performance testing, investigate defects, manage test lab environments, estimate testing efforts, mentor engineers, and report testing status.

Design, build, test, and operate production-grade, secure, and scalable software and services. Partner with customers to translate requirements into technical designs, drive engineering best practices (CI/CD, testing, observability), deliver end-to-end solutions, lead technical workstreams, and apply AI/LLM approaches where appropriate to produce production-ready outcomes.

Design, implement, and operate core components of Azure Storage, focusing on metadata and data services for a hyperscale distributed file system. Build reliable, durable, and cost-efficient storage platforms using DPUs, optimize OS and networking (TCP/RDMA), participate in design, on-call DRI duties, and drive reliability and performance improvements.

The Staff Software Engineer will lead feature delivery by building frontend and backend components, focusing on architecture, optimization, security, and performance in a fast-paced environment.

Build and own Pepper’s regulated audit platform across internal auditor tools, client and partner portals, data models, integrations, security, and reliability. Develop end-to-end features using TypeScript, React, Node.js, PostgreSQL, and Supabase. Design secure multi-tenant data isolation, authentication, audit logging, evidence integrity, integrations, observability, CI/CD, and deployment workflows. Partner with founders, auditors, CPAs, engineers, and external partners in a high-autonomy environment.

Design and implement high-performance distributed Rust systems for autonomous, human-machine-AI teaming in constrained and contested environments. Responsibilities include architecture, hardware and microcontroller integration, networking, deterministic build infrastructure, OTA updates, simulation and field testing, performance optimization, and deployment of reliable edge systems. The role supports mission-critical defense applications and requires collaboration across engineering, research, and operational teams.

Lead design and delivery of scalable, secure full-stack systems; mentor engineers; integrate AI-driven and agent-based workflows; ensure cloud-native, containerized deployments and secure SDLC practices.

Lead Software Engineer responsible for designing, developing, testing, and maintaining a distributed processing application using Python and Java. Collaborate with product owners, data coaches, analysts, DBAs, and Agile teams to meet backend/frontend requirements, implement cloud and big-data solutions (Spark/Hadoop), and ensure program standards and reliable delivery.

The Senior Software Engineer II will design scalable solutions, enhance application functionality, and collaborate with product managers to deliver features.

As a Senior Software Engineer (Backend), you will design and implement scalable applications, collaborate with agile teams, and mentor junior members while ensuring high code quality and performance.

The Staff Software Engineer will lead technical vision and execution, drive architectural decisions, mentor engineers, and ensure code quality and scalability.

Design and develop scalable backend services and APIs, building frontend applications, collaborating on features, and ensuring system reliability. Lead technical projects and improve engineering practices.

The Principal Software Engineer leads the design and development of scalable software solutions, mentors engineers, and drives architectural decisions while collaborating with cross-functional teams.

Build and operate full-stack, production-ready systems: design and ship AI-native mortgage automation, integrate third-party lending APIs, and architect scalable AWS infrastructure and job processing. Mentor engineers and ensure security, observability, and high reliability.