Top Software Engineer Jobs in St. Louis, MO

Design and deliver improvements to Wikipedia’s wikitext processing infrastructure, write PHP and JavaScript, maintain internet APIs, instrument components, and use caching and persistence technologies. Collaborate across engineering, product, design, client, and volunteer communities; own complex technical projects, make architectural decisions, maintain reliable high-performance software, write tests, address security feedback, and mentor engineers.

Designs and develops hyperscale Azure Storage backend technologies, improving reliability, scalability, observability, and engineering productivity. Leads technical strategy and high-impact initiatives across teams, architects engineering systems and pipelines, advances test automation, investigates networking and deployment issues, and improves development workflows. Responsibilities include coding, requirements analysis, design documentation, estimation, dependency identification, and on-call response for service degradation and outages.

Lead the architecture and delivery of scalable compliance-platform capabilities for government vendors, federal agencies, and SLED organizations. Design new workflows, shared infrastructure, and tagging systems while partnering with engineering, product, go-to-market teams, and early design partners. Translate evolving requirements into durable solutions, lead complex cross-functional projects, and help shape engineering culture in a rapidly scaling environment.

Lead development of Elasticsearch vector similarity search capabilities, including designing algorithms and data structures, implementing features, fixing bugs, and improving code quality. Collaborate asynchronously with a globally distributed engineering team and open-source community. Serve as a subject-matter expert on vector search relevance and implementation while contributing modern Java code and guiding cross-functional initiatives autonomously.

Own the design and implementation of WISEcode’s automated quality engineering ecosystem. Build AI-augmented UI, API, integration, regression, database, performance, and reliability testing frameworks for ASP.NET and Blazor applications. Integrate testing into CI/CD, improve observability and release confidence, investigate failures and race conditions, validate AI/ML outputs, and establish scalable quality standards and metrics across engineering teams.

Lead the technical direction, architecture, and development quality of complex Android applications. Mentor engineers, integrate backend services, support offline-first functionality and diverse hardware, oversee CI/CD and releases, and document engineering standards. The role also involves robotics integrations for public safety use cases, including drones and body-worn cameras, while collaborating with technical and non-technical stakeholders.

Design, implement, debug, and ship features for Azure Storage front end at cloud scale. Drive design, dependency identification, automation, reliability, observability, and on-call incident response while collaborating with stakeholders and mentoring engineers.

Design, implement, test, optimize, and document secure networking software for the LynxOS-178 real-time operating system. Develop embedded network protocols and services, analyze RTOS, hypervisor, and network performance, troubleshoot kernel-level issues, and support POSIX/ARINC 653 applications and certification data. Collaborate across teams on integration, reliability, interoperability, and performance while using Agile, CI/CD, scripting, and debugging tools.

Develop and maintain backend applications using .NET, C#, Redis, OpenSearch, AWS, and cloud-native technologies. Responsibilities include troubleshooting software issues, optimizing performance and reliability, conducting code reviews, supporting applications, and leading software and process improvements. The role also involves mentoring colleagues, collaborating independently or with teams, and ensuring high-quality software delivery.

Leads architecture, design, coding, delivery, and technical quality for complex software systems across an application family. Guides vendors and engineering teams, mentors developers, partners with architects, modernizes technology, establishes reusable practices, and leads incident response and root-cause analysis. Requires extensive .NET experience, microservices workflow orchestration knowledge, Agile development experience, and strong cross-functional leadership.

Work with customers and cross-functional teams to design, build, and deliver cloud-based solutions. Lead design, identify dependencies, mentor engineers, act as DRI and on-call, and improve availability, reliability, observability, and performance. Contribute to open-source assets and collaborate with Microsoft product teams to produce extensible, maintainable code and scalable solution patterns.

Develop backend software using C# and T-SQL for import functionality, performance optimization, and migration tooling. Design, implement, test, debug, document, and review high-quality code while managing integration and deployment tasks. Collaborate with product management on enhancements, participate in agile ceremonies, maintain security and regulatory compliance, and support critical issues through an on-call rotation.

Build and maintain full-stack systems for a global monitoring application supporting federal partners and satellite data access. Responsibilities include designing scalable backend services and frontend applications, improving architecture and infrastructure, integrating complex customer requirements, and owning mission-system quality and availability. The role requires collaboration across teams throughout the engineering lifecycle and experience with cloud infrastructure, observability, geospatial data, and complex integrations.

Lead Elasticsearch search relevance and vector search initiatives, designing and implementing new search features, algorithms, data structures, and bug fixes in modern Java. Improve search speed and relevance, contribute to Lucene, collaborate with a globally distributed engineering community, guide projects autonomously, review code, and work with technologies including Elasticsearch, Solr, PostgreSQL, MongoDB, and Cassandra.

Translate design specs into pixel-perfect, responsive web interfaces using TypeScript, CSS3, and HTML. Follow design systems and accessibility (WCAG) standards, optimize frontend performance, resolve spec ambiguities, collaborate remotely via documentation and code reviews, and provide frontend expertise to support AI model evaluation.

Build and maintain scalable software using Python, React, TypeScript, SQL, and relational data models. Design secure, performant solutions; use AI-assisted development workflows; improve engineering processes; and mentor junior engineers. Collaborate with Product, Design, and Engineering on technical decisions, product strategy, code reviews, documentation, and system improvements. Help integrate AI responsibly while maintaining quality, reliability, privacy, and customer experience.

Design, build, and maintain full‑stack features across frontend (TypeScript + React) and backend (Python, Node.js, or JVM languages). Own end-to-end development, testing, CI, databases, and cloud/distributed systems. Mentor engineers, participate in code reviews and pair programming, and work in an agile, remote team.

Senior full-stack engineer responsible for designing and building end-to-end features across frontend (TypeScript + React) and backend (JVM languages, Python/Node.js). Owns code quality, testing, CI, and collaborates in agile teams. Mentors junior engineers, participates in code reviews and pair-programming, and works with cloud, databases, and distributed systems. Remote role with occasional in-person meetups.

As a Senior Backend Engineer, you'll lead backend architecture, drive technical decisions, optimize systems for performance, and coordinate across teams to enhance consumer-facing features.

The Senior Software Quality Engineer will architect the automated QA framework for WISEcode's platform, focusing on quality engineering practices, automated testing for ASP.NET and Blazor applications, CI/CD integration, and collaboration with engineering teams to ensure robust quality standards are met.

Lead Elasticsearch search relevance initiatives, designing and implementing search features, algorithms, data structures, and vector search capabilities. Improve performance, scalability, and relevance; resolve complex bugs; contribute to Lucene; collaborate with globally distributed engineers and open-source contributors; and provide technical direction. The role requires modern Java development, autonomous project ownership, code review, asynchronous communication, and expertise with search or vector databases at scale.

Design and build Go-based control-plane services, CSI drivers, storage integrations, observability tools, and infrastructure automation for Kubernetes AI platforms. Integrate enterprise and scale-out storage, support bare-metal and hybrid provisioning, and deliver declarative Terraform/OpenTofu and GitOps workflows. Architect reliable storage solutions for Kubernetes clusters, air-gapped environments, and sovereign infrastructure, including artifact mirrors and PKI/TLS.

Lead development of Runware’s AI platform, including scalable backend APIs, SDKs, developer tools, and inference orchestration systems. Design high-performance distributed architectures, optimize image and video model integrations, improve reliability and observability, shape technical direction, and mentor engineers. Collaborate across platform, infrastructure, and product teams to deliver robust developer experiences and maintainable systems.

Design, build, and maintain scalable, secure backend services powering bank accounts, cards, and payments. Own distributed systems, design data models across SQL/NoSQL, build RESTful APIs, improve reliability and observability, participate in code reviews, and collaborate with cross-functional teams to deliver secure, maintainable solutions for millions of users.

Leads application engineering for an AI-powered email product, owning backend, mobile, and desktop architecture. Designs reliable AI workflows with orchestration, state management, retries, fallbacks, and failure handling; builds APIs connecting AI capabilities to product experiences; and leads a senior engineering team through architectural decisions, reviews, mentorship, and production excellence. Partners with ML leadership to ship scalable, observable, secure, and reliable systems while balancing latency, cost, user experience, and maintainability.