Top Senior Level Software Engineer Jobs in CO

Lead backend and full-stack work on the Payments team, building multi-gateway integrations (Stripe, PayPal), payment APIs, and customer payment UIs. Ensure secure, compliant (PCI-DSS) payment flows, reliability, observability, and scalability across AWS/Kubernetes microservices. Partner cross-functionally to design architecture, implement settlement/reconciliation, and maintain high availability.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Design, develop, and support Amazon Connect contact flows, serverless backend microservices (Java/Python), React-based agent workspaces, LLM-powered agentic AI (Bedrock/RAG), secure REST APIs, and observability/CI for enterprise contact center integrations.

As a Staff Software Engineer, you'll design, build, and test Gusto's core platform services, mentor engineers, and collaborate with various teams to solve complex engineering problems.

Lead engineering teams across mobile, web, and backend to create and scale new products, driving technical strategy and fostering a high-performance culture.

As a Staff Backend Engineer, you'll design and operate backend services, lead technical initiatives, ensure reliability, and mentor team members in a remote-first setup.

Design, develop, test, and deploy Go and Python microservices for a B2B financial platform. Collaborate cross-functionally, support client onboarding and documentation, build automations, monitor system reliability, and later transition to product development or team lead responsibilities.

Design, develop, test, and architect complex software systems for space and defense applications. Write maintainable code, use Git, participate in code reviews, troubleshoot issues, document processes, stay current with industry trends, and mentor junior engineers while collaborating in Agile teams.

Provide technical leadership for partner integrations (e.g., Shopify, Stripe), design solutions, manage project plans and timelines, support external partner technical questions, produce integration documentation, serve as SME/escalation point, recommend platform and tooling improvements, and collaborate with engineering and commercial teams to execute long-term partnership initiatives.

Lead design and implementation of developer tooling (SDKs, CLI, workflows), set API governance and technical standards, advocate developer experience across product teams, run community events and livestreams, and deliver high-impact cross-team SDK and platform initiatives to improve reliability, performance, and developer adoption.

Lead Android migration and launch across Cash Line and Unsecured Installment products. Define mobile architecture, partner with product/design, mentor engineers, deliver high-quality native Android and React Native solutions, and continue as a mobile specialist post-launch to improve performance and scalability.