Top Backend Engineer Jobs in Denver & Boulder, CO

Design, build, and maintain scalable backend services in Java and Python. Implement RESTful/GraphQL APIs, optimize SQL/NoSQL databases, develop microservices, enforce security (OAuth2/JWT), write unit/integration tests, optimize performance, and collaborate with frontend and DevOps teams in Agile processes.

Design and implement backend services using Java and Spring Boot, deploy to GCP/GKE, work with distributed systems (Spanner, Kafka), optimize complex SQL/PLSQL, build CI/CD pipelines (GitHub Actions, Argo CD), ensure reliability, and provide technical leadership and mentoring.

Design and build backend solutions following architecture and best practices. Develop APIs, web services, database schemas, PL/SQL/stored procedures (DB2/Oracle). Collaborate with senior engineers, participate in code reviews, testing, and coordinate technical delivery across teams. Support CI/CD and improve code quality.

Design, build, and maintain scalable backend services using Java (Spring) and Python (FastAPI/Django). Implement REST/GraphQL APIs, manage SQL and NoSQL databases, develop microservices, ensure security (OAuth2/JWT), write tests (JUnit/pytest), optimize performance, and collaborate with frontend and DevOps teams in Agile.

Design, build, and maintain scalable backend services in Java (Spring) and Python (Django/FastAPI). Implement REST/GraphQL APIs, optimize SQL and NoSQL databases, develop microservices, ensure security (OAuth2/JWT), write tests, improve performance, and collaborate with frontend and DevOps teams in Agile processes.

Design, implement, and test Java-based backend features and RESTful APIs using Spring Boot. Integrate with Vue.js front-end, write JUnit/Mockito tests, manage CI/CD pipelines, deploy containerized apps to AWS EKS, and build serverless functions with AWS Lambda.

Design, build, and scale high-performance Java/Spring Boot microservices and event-driven systems using Apache Kafka. Develop secure REST APIs, deploy containerized apps on AWS EKS, integrate with AWS services, and ensure quality via testing, performance tuning, and CI/CD.

Design, build, and maintain scalable Java Spring Boot microservices and REST APIs. Deploy and operate cloud-native applications on GCP, implement CI/CD, optimize performance and databases, ensure security and reliability, collaborate with cross-functional teams, and troubleshoot production issues.

Build and maintain Java Spring Boot microservices and serverless functions. Design RESTful APIs, integrate with Vue.js front-end, write unit tests (JUnit/Mockito), deploy containerized apps to AWS EKS and Lambda, and maintain CI/CD pipelines for reliable releases.

Design, build, test, and operate backend control plane, platform, and identity services. Implement identity features (SSO, OAuth2, SAML, WebAuthn), SCIM sync, and scalable distributed systems. Own observability, incident response, on-call duties, and improve system stability, security, and efficiency while collaborating with product and design.

Build and maintain Python backend microservices powering satellite operations, handling commands and telemetry, designing APIs, collaborating with flight and embedded teams, supporting operators, and participating in SatDevOps rotations to debug live missions.

Design, build, and maintain backend services and data pipelines that ingest, process, track, and deliver satellite payload data. Improve APIs, observability, and reliability; collaborate with mission, operations, and infrastructure teams; support incident response and SatDevOps rotations to operate spacecraft and troubleshoot data anomalies.

The Senior or Staff Backend Engineer will architect and maintain backend services, design APIs, and collaborate with cross-functional teams to enhance customer experiences and product offerings.

As a Full Stack Engineer, you will develop and implement features, APIs, and products, collaborating with cross-functional teams to enhance customer experiences.

As a Senior Backend Engineer, you'll develop, deploy, and monitor microservices, enforce security policies, and improve automation tooling.

Build, operate, and scale backend systems for card issuing and transaction processing. Break down projects, collaborate with product and cross-functional teams, write tested extensible code, support monitoring and on-call operations, and participate in team growth activities including interviews.

Design and implement cloud-based microservices for multiplayer game backends, author design documents, support live features/releases, collaborate with partners and designers, and contribute to a strong technical culture focused on player experience.

Responsible for leading a team to improve developer productivity, managing projects, and ensuring high-quality code delivery while collaborating across teams.

Design, build, and operate high-scale backend APIs, services, event-driven workflows, queues, background jobs, caching, and integrations. Lead ambiguous technical initiatives from discovery through production, improve reliability and performance, debug complex production issues, and mentor engineers while partnering cross-functionally to deliver durable backend systems.

The Staff Backend Engineer will lead the development of OXIO's telecom platform, focusing on backend systems, architecture, and scalable solutions. They will utilize multiple languages and cloud services while collaborating with stakeholders to innovate telecom apps.

Senior full‑stack engineer responsible for building backend services (Node.js/TypeScript) and integrating with frontends (React/Vue). Ship production APIs, collaborate cross‑functionally, own delivery, mentor peers, and develop modular, testable, performant systems across diverse greenfield projects.

You will design and implement scalable backend systems integrating August infrastructure with third-party DeFi protocols while collaborating with engineering teams.

The Staff Backend Engineer will own the Economic Core of Voyagu's Radar platform, focusing on financial systems architecture and ensuring revenue correctness and financial logic implementation across the system.

Senior Backend Engineer responsible for building and scaling backend systems to enhance the WeightWatchers member experience, ensuring performance and reliability. Responsibilities include developing APIs, improving data management, achieving operational excellence, and mentoring junior engineers.

Design, optimize, and scale ClickUp's search infrastructure using OpenSearch/ElasticSearch. Improve relevance, speed, and real-time indexing; build vector/semantic search capabilities; create measurement frameworks; integrate search with AI and product features; troubleshoot at scale; and mentor junior engineers to maintain high search quality under heavy load.