Top Senior Software Engineer Jobs in St. Louis, MO

The Sr Staff Software Engineer will build core banking experiences, craft user flows, robust APIs, and integrate with third-party software, requiring significant back-end development experience.

The Staff Software Engineer will develop user experiences and APIs for banking applications, focusing on code quality, system design, and team mentorship.

Design, build, and operate production AI systems, enhance backend services, improve reliability, and collaborate on technical projects within the AI-native engineering team.

As a Staff Software Engineer at Juniper Square, you'll lead architectural decisions and develop AI-powered systems, mentoring engineers and ensuring high-quality technical standards while collaborating with cross-functional teams.

You will modernize a VB6 legacy codebase using AI tools, refactoring and building new components in Python and SQL while debugging production issues.

Design and implement high-performance, 3GPP-compliant 5G Core control- and user-plane functions on ARM-based embedded Linux. Develop in C/Go/Rust, use DPDK for packet processing, optimize latency/throughput, debug protocol and performance issues, and collaborate cross-functionally to integrate carrier-grade systems.

As a Staff Software Engineer, you'll design and build backend services, lead system design efforts, mentor engineers, and ensure system quality and reliability.

The Senior Software Engineer will develop software and implement solutions, mentor engineers, and improve engineering processes at a remote startup.

The Staff Software Engineer will develop software solutions, mentor non-staff engineers, and enhance engineering processes while delivering high-quality products.

Design, build, and operate Planet's scalable object and metadata storage platform. Own backend services, Elasticsearch indexing, search, event notification, and disaster recovery. Measure performance, create alerts, be on call, drive system design and architecture, mentor engineers, and contribute to the technical roadmap for highly available, cloud-native data infrastructure.

Lead the design and development of native Windows desktop applications, enforce development best practices, and enhance accessibility features.

Lead the design and development of Windows desktop applications, enforce best practices, ensure accessibility, and take ownership of features from conception to maintenance.

Design, develop, and maintain scalable software solutions. Collaborate with teams to troubleshoot issues and enhance the software delivery lifecycle. Focus on backend services, using Java and various tools for performance optimization.

Lead full-stack feature development for an enterprise IT lifecycle platform: design, build, test, and ship end-to-end solutions. Use AI tools to accelerate work while reviewing and hardening outputs. Mentor engineers, run code reviews, collaborate with stakeholders, set estimates and milestones, and influence product and roadmap decisions. Maintain reliability through testing, CI, and containerization.

Design, build, and operate backend platform services and infrastructure, owning features end-to-end from design through production. Improve reliability, performance, and scalability across services and the data layer, investigate and resolve production incidents, and convert fixes into durable improvements. Perform database work as needed (query/index tuning, sharding, capacity planning) and collaborate with SRE and application teams to meet zero-downtime SLAs. Mentor peers and raise engineering quality through reviews and best practices.

As a Senior Software Engineer at MNTN, you'll design and operate backend systems for ad delivery, ensuring high performance and reliability. You'll work with Java, Kotlin, and Scala to handle high-throughput services and contribute to architectural decisions while improving system efficiency.

As a Senior Software Engineer, you'll design modern scalable platforms, focusing on front-end and back-end development using VueJS/ReactJS and C# microservices, while integrating with AWS and modern data warehouses.

The Senior Software Engineer will design, build, and maintain solutions for transit agencies, focusing on IoT devices and cloud services, ensuring reliable communication and device management.

The Senior Software Engineer at Omada Health will develop scalable backend systems for healthcare applications, lead projects, code, and mentor junior engineers while integrating AI tools and collaborating across teams.

As a Senior SDET, you will design and maintain test automation frameworks, embed with product teams to ensure quality, and implement AI-powered testing solutions.

Lead architecture and implementation of Chainguard Repository: design, build, and operate high-availability backend services in Go that serve package registries and APIs; improve scalability, reliability, observability, and load testing; drive technical decisions, collaborate across teams, and mentor engineers.

The Senior Software Engineer will develop software for automated mobile application analysis, lead implementation decisions, and mentor junior engineers.

Design, build, and lead scalable API and platform features. Mentor junior engineers and drive technical initiatives from design to delivery.

As a Senior Software Engineer at Cribl, you will contribute to building and delivering improved cloud services, solve infrastructure issues, implement product roadmaps, and ensure software quality and reliability. You will work autonomously within a distributed team and engage with product development, focusing on creating scalable and reliable infrastructure solutions.

Lead design and build of a 0-1 Identity Graph platform for real-time identity resolution. Own architecture, implement high-performance synchronous read models, build data pipelines, enforce PII privacy boundaries, ensure production resilience and observability, and mentor engineering teams while aligning cross-team stakeholders.