Top Senior Level Software Engineer Jobs in Salt Lake City, UT

As a Senior/Staff Software Engineer, you will lead web application development and integrations, mentor engineers, and ensure high-quality project delivery.

Senior mainframe engineer delivering secure, resilient enterprise application solutions across the full lifecycle: analysis, design, implementation, testing, CI/CD, and production support. Tasks include COBOL/CICS/JCL development, DB2 data work, batch and online processing troubleshooting, SDLC and DevOps practices, modernization and integration (APIs, MQ, z/OS Connect), mentoring junior engineers, and ensuring release readiness, performance, and operational stability.

Contribute expert-level code samples, implement and optimize features, debug complex defects, refactor legacy code, document technical decisions for AI training, and review peer submissions across Python3, Java, Rust, Go, C++, and TypeScript codebases in a part-time remote contract role.

Build and maintain responsive, accessible front-end interfaces using React, React Native, HTML, CSS, and Shopify. Apply UX/UI principles, collaborate with designers and multidisciplinary teams, provide clear technical feedback, and independently deliver high-quality work on complex technology or AI-related projects. Contractors complete output-based tasks and must meet weekly minimum submission requirements, with an expected start within 24–48 hours of onboarding.

Looking for senior engineering leaders with ownership experience in high growth startup or tech companies for multiple portfolio companies.

Design and build React-based applications, support component design and deployment practices, implement data storage and scalable performance optimizations, work with clients and technical leads, apply UI/UX principles, testing at all levels, collaborate on code reviews and agile delivery.

Lead design, build, test, and deliver Workday integrations across a multi-system higher education environment. Own integration strategy, implement EIBs/Core Connectors/Studio/APIs, coordinate testing and cutovers, ensure FERPA-compliant data security, and partner with vendors and IT for documentation and operational handoff.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Lead Workday configuration and development across modules; design BPF workflows; build calculated fields, condition rules, and custom objects; define security roles; support testing, deployment, and post-production stabilization; document configurations and ensure Higher Ed governance compliance.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Volunteer senior developer to design, build, and maintain a cross-platform medical scheduling app (web, iOS, Android). Participate across the full development lifecycle: design, coding, testing, CI, deployments, code reviews, production support, incident management, and platform architecture. Attend weekly standups and commit at least four hours per week.

Design, build, and maintain full-stack browser-based ChartCheck web application using JavaScript/TypeScript. Collaborate with cross-functional teams, implement RESTful APIs, work with MongoDB/SQL databases, conduct code reviews, mentor teammates, and ensure secure, compliant healthcare software practices.

Design, build, and maintain ClearCheck .NET/WPF desktop software for radiotherapy plan checking. Implement DICOM integration, 3D image/dose/plan visualization and DVH evaluation, collaborate with physicists to translate clinical requirements, contribute to architecture, testing and code reviews, and mentor teammates to deliver performant, reliable medical imaging solutions.

Design and implement backend components for a distributed vector database, focusing on performance and reliability in high-throughput environments, utilizing C and C++, while collaborating on backend capabilities.

Design and scale high-throughput, low-latency backend systems powering Fetch’s advertising platform. Own architecture across ad selection, targeting, delivery, attribution, and measurement services; improve reliability, observability, performance, and resilience; lead cross-team technical initiatives and migrations; establish engineering standards; resolve complex distributed-systems problems; and mentor senior engineers across Ads, Platform, Data, ML, and Product teams.