Top Senior Backend Engineer Jobs in Denver & Boulder, CO

Design, develop, and operate scalable backend systems focused on authentication and authorization. Lead secure REST API and IAM feature development, mentor engineers, perform security-first code reviews, integrate observability, and drive reliable production releases in a remote-first SaaS environment.

Design, implement, and maintain scalable, high-performance backend services for Home Assistant Cloud. Work on authentication, subscriptions, and payment services, participate in code reviews, collaborate cross-functionally, apply security and data-protection best practices, and operate production systems including troubleshooting and improving reliability and performance.

Build, scale, and maintain cloud-native backend services and APIs using C#/.NET on Azure. Lead architecture, performance optimization, CI/CD, code reviews, mentor engineers, and collaborate with product, design, and frontend teams to deliver reliable, high-performance features.

The Senior Backend Engineer will design and implement infrastructure for an AI system, solve complex data-related problems, and ensure system scalability and security.

As a Senior Back-End Engineer II, you will focus on platform engineering and DevOps, building CI/CD pipelines, managing cloud infrastructure, and supporting database operations.

Develop and maintain backend solutions, ensuring performance, security, and regulatory compliance, while collaborating in cross-functional teams.

Responsible for designing and maintaining scalable backend systems, leading architectural decisions, implementing security measures, collaborating with teams, and mentoring others.

As a Senior Backend Engineer at Edia, you will architect backend systems, supervise AI coding processes, and enhance AI-driven business automation.

Build and scale real-time backend systems for AI Agents, including orchestration, memory and context management, low-latency inference pipelines, eval frameworks, event-driven workflows, APIs (REST/gRPC), and production-grade observability, partnering with Applied AI and product teams to deploy multi-tenant, enterprise AI agent platforms.

Build and own production backend services in Python for a large-scale ecommerce search platform. Work with SQL-heavy systems, monitoring/alerting, and debugging user-facing systems. Deliver maintainable software via tests, code review, and incremental delivery. Collaborate on data integrations and optional ETL/ELT workflows with PySpark; apply SEO, API/auth, and unstructured data knowledge when needed.

Lead design and development of multi-tenant backend services and APIs on public cloud (AWS). Focus on automation, testing, security, scalability, and performance. Mentor junior engineers, interact with customers/partners for integrations, and solve space communications platform challenges.

Lead design and development of multi-tenant backend services and APIs for a space communications platform on AWS. Build scalable, secure services with automation, testing, and mentorship of junior engineers; interact with customers and partners and support operations for US government satellites.

The Senior Staff Software Engineer will architect Affirm's lakehouse analytics platform, lead data governance efforts, mentor engineers, and collaborate across teams to optimize data solutions using Snowflake and other big data tools.

The Senior Backend Engineer will build and maintain backend services for an observability platform, ensuring high performance and reliability. Responsibilities include managing APIs, engaging with the community, and tackling technical challenges related to data processing.

Design, build, and own backend systems for blockchain and staking infrastructure. Implement APIs, Ethereum data pipelines, indexers, validator integrations, and operational tooling. Lead architecture, testing, deployment, observability, mentor engineers, and drive engineering standards and AI-assisted workflows.

Seeking a Senior Backend Engineer for a payment modernization project, focusing on API integrations, payment routing logic, and payment orchestration systems under the CTO's guidance.

The Senior Backend Engineer at Weave will design, build, and maintain scalable backend services and APIs, influencing architecture and outcomes while collaborating across teams to enhance healthcare technology.

Design, build, and scale event-driven, distributed backend systems in Python to extract and enrich metadata at massive scale. Lead architecture, mentor engineers, integrate ML/LLM components, optimize performance, and ensure observability and reliability across AWS-based pipelines.

Lead design and scaling of content ingestion, metadata, and processing systems. Build reliable pipelines handling messy formats, collaborate with ML, security, and product teams, mentor engineers, and drive platform and AI/LLM integration for content workflows and quality.

The Senior Back End Engineer will develop and enhance critical services, manage APIs, optimize application architecture, and mentor junior engineers.

As a Senior Platform Engineer at Greenbox Capital, you'll modernize the origination ecosystem, focusing on scalable services, API development, and system integration, requiring strong collaboration and technical leadership skills.

Lead design, build, and maintain provider integration infrastructure connecting to insurance carrier and partner APIs. Own end-to-end connector development, testing, validation against live traffic, and ongoing mapping/business rules. Define technical direction, scope projects, mentor engineers, perform code reviews, and drive operational excellence while collaborating cross-functionally to align engineering work with product goals.

The Senior Backend Engineer develops core product features in ETL and GraphQL, designs APIs, builds ETL pipelines, and collaborates with frontend teams.

As a Senior Backend Developer, you'll design and maintain high-volume pipelines and databases, implement ETLs for automated abuse-prevention, and develop monitoring solutions while collaborating with teams on safety systems.

The Senior Backend Engineer will lead AI-focused projects, optimize data pipelines, mentor juniors, and enhance customer support through innovative technologies.