Top Senior Backend Engineer Jobs in Denver & Boulder, CO

The Senior Backend Engineer will enhance data integration infrastructure, manage internal systems, and collaborate with teams to execute engineering tasks for growth initiatives.

As a Senior Software Engineer, you'll own backend systems, mentor team members, and collaborate with product and design to build user-focused solutions.

Design, build, test, and maintain backend services and APIs for an insurance platform. Integrate external services and data providers, improve system stability, performance, and scalability, participate in architecture discussions, mentor teammates, and support internal tooling and deployment practices.

The Senior Back-End Engineer will build cloud-native back-end services, APIs, and microservices for a health technology platform, focusing on scalability, security, and compliance.

The Senior Backend Engineer will develop the Payroll product, overseeing the entire development cycle from design to deployment, in a microservices architecture.

Design, build, and maintain scalable backend services and APIs for commerce workflows using Python/Django. Improve reliability, performance, and observability, operate AWS deployments, work with PostgreSQL and event-driven architectures (SNS/SQS), modernize legacy systems, and support CI/CD, testing, and production troubleshooting.

Develop and maintain software applications, collaborate in agile teams, mentor junior engineers, and enhance digital experiences using modern technologies.

As a Senior Backend Engineer at DuckDuckGo, you'll lead backend projects, mentor engineers, and develop AI-enhanced features for the company's privacy-centric product line.

The Senior Backend Engineer II will design, build, and maintain backend services for financial workflows, collaborating with product and engineering teams to enhance system reliability and performance.

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

Senior Backend Engineer responsible for building, deploying, and monitoring backend applications. Collaborate with product and cross-functional teams to design/version APIs, build event-driven/asynchronous systems, improve performance and reliability, and drive CI/CD and observability best practices. Ship high-quality, well-tested features and support platform scalability and maintainability.

Design, build, and support features for a monetization platform while ensuring reliability and performance as a senior backend engineer.

Senior Backend Engineer responsible for designing and building backend services and microservices for payment products. Work includes C++/C#/Java development, REST APIs, Informix/Postgres data stores, CI/CD, cloud deployments, encryption, TDD, and collaborative agile delivery with ownership of architecture and operational quality.

The Backend Engineer will design and maintain scalable backend services, develop APIs, optimize data storage, and ensure system performance and reliability, collaborating with various teams.

Design, build, and scale backend services for payments and transaction processing. Lead projects and mentor engineers in a collaborative environment.

The Senior Software Engineer will lead and support a team in developing reliable and scalable backend systems, collaborating on product development, and improving infrastructure for secure communication between services.

The Senior Software Engineer will design and develop scalable applications, enhance DevOps practices, and drive continuous improvement within infrastructure and systems.

The role involves developing high-scale, distributed backend systems, collaborating with teams, and optimizing products through A/B testing.

The role involves developing a decentralized darkpool with high-performance matching engine, cross-chain liquidity aggregation, and fault-tolerant architecture while ensuring cryptographic privacy and low latency.

Build, enhance, and maintain backend services and REST APIs in Go; develop ETL pipelines in Python; design reliable PostgreSQL-backed APIs; use AWS services (S3, Lambda, Step Functions, Glue) for data processing; write well-tested, secure code; support operations and maintenance; participate in code reviews and cross-functional Agile collaboration.

Build and operate distributed systems for profile ingestion and queries in Pyroscope. Lead projects end-to-end, participate in on-call rotations, mentor teammates, design for reliability and performance, and work closely with customers and Grafana Cloud teams.

Build and own the graph layer and RAG architecture enabling agent reasoning over full patient context. Select graph DBs, design query patterns, and ensure temporal coherence. Implement event-driven Kafka pipelines for auditable, immutable agent workflows and enforce ReBAC permissions. Prioritize safety and scalable AI-assisted workflows, participate in spec and plan reviews, and drive architecture decisions.

The Senior Back-End Developer builds and maintains server-side operations for cloud solutions, collaborating with teams to deliver software, support users, and document features.

The Senior Backend Engineer will lead client projects, build AI solutions, and develop technical standards while mentoring junior engineers.

Design and implement data infrastructure for Oura's Context Hub. Responsibilities include building data pipelines, defining data models, creating APIs, and ensuring system resilience in production environments.