Top Software Engineer Jobs in St. Louis, MO

Provide hands-on technical leadership for Keeper’s cross-platform browser extension architecture. Design secure, scalable solutions using JavaScript and TypeScript; guide extension components, messaging, storage, APIs, native integrations, performance, and reliability. Lead architecture and design reviews, security collaboration, modernization efforts, and cross-functional technical decisions while mentoring senior engineers. The role requires broad full-stack expertise across cloud infrastructure, distributed systems, databases, application security, CI/CD, and modern web technologies.

The Principal Engineer will lead the design and delivery of core platform capabilities, focusing on scalable systems, AI application, and mentoring engineers while driving architectural decisions and improving operational systems.

Reviews and evaluates engineering, infrastructure, and platform documents and work products for technical accuracy, completeness, clarity, consistency, and relevance. Provides structured feedback, identifies errors and gaps, compares technical approaches, and follows defined evaluation frameworks. Requires independent work, strong communication, analytical ability, and professional engineering judgment. The role is fully remote and supports varied technical evaluation projects as an independent contractor.

Design, develop, deploy, and maintain end-to-end cloud-hosted and cloud-native applications for federal clients. Collaborate with technical and business leads to translate requirements into solutions, manage software development lifecycle activities, follow coding and architecture standards, and deliver tested artifacts. The role includes API and cloud architecture, infrastructure-as-code, Agile development, application security, and responsible use of AI tools to accelerate testing.

Co-found and lead the technical direction of a new B2B AI venture. Own problem framing, architecture, system design, product judgment, AI product development, customer discovery, verification, fundraising support, and eventual technical team building. Build maintainable AI and agentic systems that solve real customer workflows, prioritizing traction before scale. The role requires a full-time, exclusive founder commitment with meaningful equity and authority.

IT Development Program interns gain hands-on experience contributing to healthcare technology projects across data analytics, technical product management, digital engineering, and cybersecurity. Responsibilities include developing digital solutions, solving real-world technology challenges, collaborating globally, and building technical, leadership, communication, and problem-solving skills. The internship lasts at least 10 weeks during Summer 2027 and is based in Waukesha, Wisconsin, or remotely within the United States.

Develop and maintain PowerUp Sports’ software platform, build and release new features, integrate technologies, optimize PHP applications on Azure, manage SQL Server databases, participate in code reviews, mentor junior developers, and support scalable, reliable architecture.

Build and maintain Django-based web applications, design RESTful APIs, implement frontend features (HTML/CSS/JS), optimize performance and security, collaborate with cross-functional teams throughout the development lifecycle.

Develop client-side features for a complex live multiplayer mobile game using Unity3D. Responsibilities include implementing LiveOps content, writing production-ready code, designing feature architecture, optimizing mobile performance, integrating assets, improving asset workflows, and collaborating with international interdisciplinary teams across shared game systems.

Lead architecture and hands-on development for risk, fraud, scam prevention, money operations, reconciliations, and chargebacks. Build resilient, low-latency, event-driven financial systems with auditable ledgers, strong correctness, and high availability. Mentor engineers, establish technical direction, support production ownership, and collaborate with Product, Data/ML, Compliance, and engineering leaders. Apply AI-assisted tooling and deliver scalable, compliant services across global payment infrastructure.