Top Software Engineer Jobs in St. Louis, MO

Build and maintain backend systems, payment integrations, data pipelines, and user experiences for Flex’s partner engineering platform. Design robust, fault-tolerant services that integrate with external dependencies, using Java, Spring, AWS, REST APIs, message queues, and scalable architectures. Collaborate cross-functionally with engineering, product, design, infrastructure, sales, partners, and customer success while mentoring engineers and improving development standards.

Design, implement, and operate features for Temporal’s open source distributed systems server. Solve challenges involving scheduling, task processing, workflow execution, persistence, quotas, visibility, and performance. Improve reliability through testing, observability, dashboards, alerts, runbooks, and documentation. Collaborate across engineering and product teams, participate in design reviews, contribute to developer experience, and mentor junior engineers.

Build and operate internal software, platform services, developer tooling, Kubernetes infrastructure, and reproducible Nix environments. Develop Go and Rust automation, improve CI/CD and reliability, support Linux systems, networking, identity, endpoints, and SaaS platforms, and resolve ambiguous technical problems independently. Partner across engineering, security, operations, and business teams while mentoring engineers and shaping technical direction.

Lead development of high-performance Rust parsers, compilers, automata, indexes, and data structures for structured language-model generation. Optimize decoding-loop performance through profiling and benchmarking, integrate Python bindings and C++/CUDA components into inference engines, collaborate across teams, and maintain production-quality code through testing and CI/CD.

Provides hands-on technical leadership for complex software architecture, design, development, modernization, and delivery. Partners across engineering, product, and architecture teams; mentors engineers; reviews designs and code; guides distributed, event-driven, cloud-native solutions; and promotes testing, CI/CD, observability, security, and operational excellence. The role remains an individual contributor while influencing technical decisions, managing dependencies, solving ambiguous problems, and evaluating emerging Generative AI and Agentic AI capabilities.

Lead customer implementations of healthcare data platform solutions by configuring the Smile platform, scripting, troubleshooting, designing technical solutions, and providing architectural guidance. Collaborate with customers and internal teams to deliver scalable, secure solutions, support technical analysts, contribute to RFPs, manage concurrent projects, and participate in on-call support.

Develop and architect Salesforce Commerce Cloud features for a telehealth e-commerce platform. Build responsive React and Builder.io experiences, custom cartridges, integrations, and commerce feeds spanning inventory, pricing, order management, prescriptions, reviews, and analytics. Manage OCAPI/SCAPI integrations, Cloudflare caching, Business Manager configuration, performance monitoring, releases, and compliance. Collaborate with agencies and internal teams, mitigate project risks, and mentor junior engineers.

Leads a domain of GiveDirectly’s cash delivery platform, managing 5–7 senior engineers while owning technical outcomes, reliability, architecture, delivery, and operational excellence. Partners with product and organizational stakeholders on roadmaps, technical debt, infrastructure, incident response, and engineering culture. Recruits, coaches, and retains a high-performing team; sets technical quality standards; and scales payment, core platform, or offline-first data collection systems to support billions in annual cash delivery.

Develop and configure SAP Fiori and SAPUI5 applications for an SAP S/4HANA implementation. Translate user requirements into technical designs, build reusable interfaces and APIs, integrate SAP and non-SAP systems, enhance standard Fiori applications, and perform custom development. Collaborate in an Agile/Scrum environment, participate in code reviews, troubleshoot complex issues, and communicate with clients and management while supporting a government customer.

Design, build, ship, and own high-scale, user-facing product features across frontend, backend, and data systems. Define problems, scope and prioritize work, collaborate with Product, monitor production usage, debug incidents, improve reliability, review code, and mentor engineers. The role requires strong backend expertise alongside React proficiency and ownership from product discovery through long-term maintenance.