Top Senior Software Engineer Jobs in St. Louis, MO

Design, build, and operate high-scale Customer Care and Identity systems using React, TypeScript, Java/Node.js. Lead AI-first workflows, own end-to-end full-stack features, implement AI-driven efficiencies, ensure security and reliability, mentor peers, and collaborate cross-functionally on integrations and operational excellence.

Build and operate Go backend services for a non-custodial KMS powering embedded wallets. Implement key recovery, distributed key generation, TEE integrations, authentication and signing-provider flows, security review and hardening, and production operations on Kubernetes, including observability, secrets/certificate management, and compliance controls.

Design, build, and operate reliable backend systems while mentoring engineers, participating in design discussions, and improving system performance.

The Lead Systems HPC Engineer will optimize GPU clusters' performance, troubleshoot issues, integrate new hardware, and collaborate with teams on system-level software development.

Design and implement embedded firmware and low-level software for server BMCs and GPU/HPC platforms. Enhance OpenBMC, enable real-time telemetry of power/thermal sensors, debug low-level drivers and interfaces, validate hardware-firmware integration, and contribute to long-term firmware architecture for cluster reliability.

Build and maintain large-scale batch and streaming data ingestion and ETL pipelines for global geospatial datasets. Implement, test, monitor, and optimize backend services on AWS; integrate data with APIs; mentor engineers; reduce technical debt; and participate in design, code reviews, and on-call support to ensure data quality and operational excellence.

As a Principal/Staff Software Engineer, you will design, implement, and lead embedded software for Optical DCI transport systems, ensuring performance and reliability.

The Senior Software Engineer will enhance Attentive's event streaming platform, architect high-throughput systems, improve tools for product teams, and tackle complex distributed challenges. Responsibilities include collaborating on messaging systems and modernizing the architecture.

Own and improve the end-to-end developer experience for AIMS ML teams: local/remote dev environments, build/test infrastructure, CI/CD, and internal platforms. Design, build, and operate large-scale build and CI systems, remove developer friction, instrument workflows, drive adoption, and set technical standards. Partner with ML researchers to prioritize productivity investments and evaluate/integrate GenAI-powered developer tooling with safety guardrails.

Own and scale the search, indexing, and data-scanning infrastructure for petabyte-scale data. Optimize hybrid lexical and vector retrieval for sub-second latency, design cost-effective hot/warm/cold data tiering and massive asynchronous scans, drive down latency and cost, and provide technical leadership for resilient, highly available indexing and retrieval systems.

Own and scale the core betting experience across mobile and web using React Native. Diagnose and fix critical client issues, lead cross-platform design reviews, partner with backend/product/design, use analytics to validate changes, coach engineers, and drive reliability, performance, and developer-velocity initiatives.

Design, implement, and operate cloud-native microservices and platform services for high-throughput supply chain systems. Build and optimize real-time and batch data pipelines, define APIs and event-driven integrations, use AI-assisted development tools, own production reliability, participate in code review, and mentor engineers while producing robust, scalable solutions.

Lead the design and implementation of end-to-end quality systems and testing frameworks. Own multiple testing layers (unit, integration, E2E, contract, performance, chaos), integrate automated tests into CI/CD, drive load/performance testing and monitoring, troubleshoot failures, apply AI tooling to improve workflows, and collaborate with engineers, PMs, and designers to improve coverage and reliability.

Design and build backend services, APIs, SDKs, and user-facing systems enabling secure agent-to-agent financial interactions. Implement cryptographic identity, payment workflows, transaction processing, reputation tools, and scalable infrastructure for AI-native financial products.

Lead architecture and backend development for the vCluster platform by designing and implementing Kubernetes-native solutions in Go, owning features end-to-end, contributing to open-source, and solving deep systems challenges around multi-tenancy, isolation, and GPU infrastructure.

Architect and build core backend components of the vCluster platform by working deeply with Kubernetes internals. Write high-performance Go code, take end-to-end ownership from design to release, contribute to open-source projects, and solve complex systems and multi-tenancy problems for GPU and Kubernetes-based infrastructure.

Build and own foundational data infrastructure for Member Marketing and Coverage Eligibility: define data contracts, ensure identity and lineage, implement observability and reconciliation, modernize file/API integrations, design for correctness and auditability in regulated workflows, and lead cross-functional delivery and technical standards.

Lead design and implementation of the audio engine for Splice's DAW plugins and desktop app. Drive complex technical initiatives, propose and implement cross-stack solutions, optimize performance, mentor engineers, author RFCs, and collaborate with product and design to shape user experience and roadmap. Deliver high-quality, production-ready audio software under tight deadlines.

The Staff Software Engineer will enhance developer productivity by designing tools, automating workflows, and mentoring teams on best practices in developer experience.

The Staff Software Engineer - Platform will design and build core services for scalable data analytics, mentor teams, enhance platform reliability, and implement cloud-native solutions.

The Staff Software Engineer will design and operate high-integrity financial systems including ledgering, transaction processing, and money movement while ensuring system correctness and resilience.

The Staff Software Engineer will design and operate financial systems involving ledgering, transaction processing, decisioning, and money movement, ensuring correctness and reliability while mentoring engineers and improving system resilience.

Design, build, and evolve customer-facing backend services and public APIs; own features end-to-end from design through rollout; create technical design documents; ensure services are observable, resilient, and usable across multiple products; collaborate closely with Product and Experience teams to prioritize and ship iterations.

The Staff SDET will design and implement automated test frameworks using TypeScript, collaborate with developers, and enhance testing processes within CI/CD pipelines.

The Senior Software Engineer will enhance the core product by developing features and tools for Chainguard Images, collaborating with teams and ensuring product quality.