Top Software Engineer Jobs in St. Louis, MO

Lead design and implementation of scalable data ingestion, transformation, and search systems for security telemetry. Build and maintain event-streaming pipelines, integrate third-party data sources, partner with product stakeholders, apply AI agents for data mapping and correlation, set engineering standards, improve observability and testing, and mentor junior engineers.

Architect and implement latency-critical protocol components (consensus, state sync, mempool) in Rust. Build fault-tolerant distributed systems, optimize throughput and latency, collaborate with research/product, debug live systems, and contribute testing, benchmarking, and release standards.

Lead design, build, and operation of AI-powered product features across backend, frontend, and AI systems. Make architecture decisions, drive production deployments, improve code quality and reliability, mentor engineers, and own features end-to-end.

Provide technical leadership and hands-on engineering across AI, data, backend, and frontend systems. Drive architecture, remove technical risks, set engineering standards, mentor senior engineers, and influence cross-team technical direction.

Lead company-level technical direction for an AI-native insurance platform. Own architecture across AI, data, infrastructure, and product; resolve high-impact technical decisions; establish org-wide engineering standards; and mentor senior engineers while partnering with founders to shape long-term technical vision.

Lead architecture and implementation to scale a large Kubernetes-native microservice platform into cell-based deployments. Decompose services, build shared libraries and configuration frameworks, enable private/isolated cloud deployments, land changes in product services, set architecture patterns, partner with Cloud Platform/SRE/DevEx, mentor senior engineers, and embed AI tooling into development workflows.

Lead technical strategy to scale a multi-ecosystem libraries platform: generalize package indexing, build orchestration, and remediation automation from CVE detection to verified release. Drive agentic/AI-driven patch generation, set platform architecture and SLOs, mentor senior engineers, own incident response, and get hands-on resolving toolchain, compiler, and packaging failures for new ecosystems (.NET, Go, Rust).

Lead cross-functional teams to define and evolve platform and application architecture, introduce new technologies and best practices, solve cross-team technical challenges, guide global cloud and regulated (FedRAMP) deployments, and mentor engineers while driving engineering quality, observability, and production readiness.

The Senior Software Engineer designs and develops complex features within OneStream solutions, ensuring technical excellence and mentoring other engineers. Responsibilities include architectural design, UI development, API creation, performance improvements, and collaboration across teams.

Design, build, and maintain cloud-native applications using .NET and React. Develop backend services, APIs, and front-end interfaces while ensuring system stability and scalability. Collaborate across teams to improve healthcare solutions through software and AI-powered tools.

As a Senior Software Engineer, you will develop and maintain Alpaca's platform services, including event streaming infrastructure and authentication systems, while ensuring software quality and reliability.

As a Senior Software Engineer, you'll design and build scalable market data systems, improve API architecture, and enhance overall system performance, contributing to Alpaca's infrastructure for trading financial assets.

The Senior Software Engineer will develop scalable systems for cash delivery, improve developer workflows, and collaborate with teams to enhance program delivery.

Lead technical direction and deliver collision-free motion planning for humanoid robots. Design, implement, test, and deploy trajectory optimization, MPC, and sample-based planners; architect modular planning systems integrated with perception, state estimation, and control; develop algorithms robust to uncertainty; and provide cross-team technical leadership and mentorship.

Develop high-reliability software for safety-critical applications in UAS technology. Collaborate with teams, maintain solutions, and automate processes.

The Senior Software Engineer will own the development of full-stack features from UI to backend, mentor junior engineers, and drive technical decisions.

The Senior Backend Engineer will design and build scalable cloud-native backend systems for real-time monitoring and automation in HVAC operations, owning the entire lifecycle of services and mentoring junior engineers.

Own quality engineering for Commerce: run structured manual QA, build E2E automation (storefront, checkout, brand portal), wire tests into CI, define Shopify-specific compatibility playbooks, set quality metrics and gates, participate in planning and spec reviews, and lead the teamto shift coverage left.

The Staff Software Engineer will lead technical initiatives, drive quality code, mentor engineers, and work on scalable systems in a high-impact team environment.

Design, build, and enhance Cority's software platform across product streams. Own features end-to-end, debug cross-system issues, drive observability, contribute technical direction, perform code reviews, mentor junior engineers, and collaborate with Product Owners to translate requirements into scalable technical designs.

Design and develop scalable software applications, implement automated testing, mentor junior developers, and optimize performance in a remote environment.

As a Senior Software Engineer, you will design and develop user-facing products and back-office tools while collaborating with diverse teams to solve complex problems with innovative solutions.

Lead design and implementation of the payment integrations platform (APIs, SDKs, embedded web), build scalable payment rails (ACH), drive technical roadmap, mentor engineers, collaborate cross-functionally, and improve operations via automation, tooling, and observability.

Design, build, test, and scale backend services and integrations (payments, billing, identity, partner integrations). Lead API design and production rollouts, build fault-tolerant systems and data pipelines, collaborate cross-functionally, and mentor peers to deliver frequent, iterative product improvements.

The role involves owning the email channel's infrastructure, developing frontend experiences, designing backend systems, and ensuring deliverability in a cloud-native environment.