Top Backend Engineer Jobs in Seattle, WA

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.

As a Backend Software Engineer, you will build forecasting software for military logistics, utilizing mathematical models and collaborating with teams to enhance operational capabilities.

Design, implement, and evolve complex backend features and architecture. Improve reliability, performance, and security at scale. Mentor engineers, participate in incident response, set backend standards, and integrate agentic AI into production workflows.

Lead technical strategy and execution for a backend ledger team building highly available, audit-grade financial systems. Drive architecture, reliability, monitoring, on-call practices, code quality, cross-functional collaboration, and mentoring to ensure accurate, scalable ledger operations.

Design, build, and maintain Python backend services and internal APIs for high-traffic hosting platforms. Administer Linux production systems, optimize MySQL queries and schemas, troubleshoot incidents, and participate in on-call rotation. Collaborate with senior engineers and cross-functional teams to deliver tested features, modernize legacy Perl systems, and contribute to technical design decisions. Apply AI responsibly throughout development, debugging, testing, and code review.

Build and maintain Python backend services, internal tools, and automations; support Linux production systems; write and optimize MySQL queries; use and review AI-assisted development tools; collaborate with senior engineers; participate in code reviews, sprint ceremonies, documentation, troubleshooting, and incident response.

Lead the architecture, development, deployment, and reliability of scalable APIs for Afresh’s flagship AI ordering product. Partner with product, account management, and engineering teams to deliver integrated solutions, support the existing iPad application, and shape future product direction. Drive projects from conception through launch, enforce testing and release best practices, mentor junior engineers, participate in Agile ceremonies, and provide constructive code reviews.

Design and implement backend and real-time features in the GitLab monolith for portfolio planning at scale. Optimize PostgreSQL performance, evolve APIs (GraphQL/REST), build capacity planning and work-item hierarchies, create proofs of concept, maintain automated tests, support safe rollouts with feature flags and observability, mentor contributors, and participate in on-call and production troubleshooting.

Develop and maintain Tailscale’s control plane, relay infrastructure, identity integrations, open-source client code, and backend services. Design, test, document, and operate scalable software with strong observability and security. Participate in incident response and customer escalations, improve system efficiency and stability, and collaborate asynchronously with engineers, designers, and product managers throughout the product lifecycle.

Build and maintain data pipelines, PostgreSQL systems, Kubernetes infrastructure, deployment tooling, and SaaS integrations. The role includes infrastructure reliability, observability, incident response, security collaboration, Salesforce data flows, CI/CD, testing, debugging, and agile delivery. The engineer will connect data infrastructure with Techstars OS product teams and improve reliable, secure systems across the organization.

Design, build, and operate high-throughput backend platforms and shared services supporting multiple engineering teams. Responsibilities include distributed systems architecture, event processing, asynchronous jobs, caching, rate limiting, observability, multi-region reliability, API standards, performance optimization, incident response, technical documentation, cross-team leadership, and mentoring. The role requires strong backend language expertise, messaging and streaming knowledge, data-store experience, and leadership of large platform initiatives.

Build and operate backend services for an AI-powered hardware development platform. Design REST APIs, ingestion pipelines, background task systems, and agentic AI workflows that convert unstructured inputs into engineering artifacts. Integrate LLM APIs with streaming, error handling, and cost optimization, deploy services on GCP using Terraform, and establish reliable coding, testing, and review practices. The role requires daily hands-on development and collaboration with AI researchers, product leadership, and engineering teams.

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, build, and maintain scalable backend services and infrastructure for Roadie’s logistics platform. Identify performance bottlenecks, improve reliability, collaborate with Product, Data Science, and engineering teams, contribute to code reviews and technical practices, and own projects from concept through production.

Design, develop, and maintain scalable cloud-native backend applications using Node.js, React, and AWS services. Collaborate with cross-functional teams to support federal missions, troubleshoot complex issues, identify root causes, and deliver secure, high-performing solutions. The role also involves relational database and DynamoDB work, agile development, CI/CD practices, and adapting to new technologies.

Design, build, and maintain scalable backend services, APIs, databases, data flows, and infrastructure. Lead complex features from design through deployment while improving performance, observability, security, reliability, and testing. Integrate third-party systems, support cloud infrastructure and CI/CD practices, and provide technical mentorship and guidance to engineers.

Build and maintain backend services, APIs, and integration layers for a modular ecommerce platform. Integrate personalization, semantic and LLM search, DAM, PIM, SAP/HANA, ERP, analytics, and customer data systems. Use AI coding agents throughout development while validating code quality, security, performance, and reliability. Design scalable APIs, automated testing, observability, and reusable architecture while collaborating with internal teams, vendors, and implementation partners.

Designs, builds, and maintains scalable backend services, APIs, databases, data flows, and infrastructure. Leads complex features from design through deployment while improving performance, observability, security, testing, and reliability. Integrates third-party platforms, supports cloud infrastructure and CI/CD practices, and mentors engineers through technical guidance and knowledge sharing.

Build and maintain scalable backend services, RESTful and GraphQL APIs, database schemas, and cloud infrastructure. Own architecture decisions, optimize performance and reliability, improve CI/CD practices, collaborate across product and engineering teams, lead architecture sessions, review code, and mentor junior developers.

Lead the design, architecture, development, deployment, and optimization of scalable .NET backend systems processing millions of daily healthcare transactions. Mentor developers, guide technical decisions, improve CI/CD pipelines, implement secure APIs, and collaborate with product stakeholders. The role requires expertise in .NET, C#, ASP.NET Core, cloud-native AWS services, Kubernetes, microservices, distributed systems, testing, observability, and secure software development.

Design and build scalable backend services and RESTish APIs for a multi-tenant streaming platform. Develop customer- and enterprise-facing web server backends in Go, ensure web application security, and support highly available cloud systems. Conduct code reviews, troubleshoot issues, and improve performance, reliability, scalability, and maintainability across global services. The role requires experience with high-traffic web services, distributed architectures, containers, and CDNs.

Develops, tests, enhances, and maintains Java backend applications and services for a mission-critical transportation system. Responsibilities include building RESTful APIs, integrations, business logic, database functionality, unit and integration tests, troubleshooting, code reviews, CI/CD participation, secure coding, documentation, and Agile collaboration. The role supports DevSecOps practices, DoD security requirements, system deployments, and occasional front-end integration with Angular.

Design, develop, and maintain scalable, high-performance backend and middleware services on the JVM using Java and Spring/Spring Cloud. Build and enhance microservices, work with AWS and Docker, implement SQL/noSQL solutions (MySQL, Elasticsearch), use Git-based source control and JIRA, collaborate across engineering, design, and QA, and mentor teammates while following best practices and Agile methodologies.

Design, build, test, deploy, and support scalable backend applications across the full software development lifecycle. Collaborate with product, UX, nutrition, vendors, and business stakeholders to define solutions and interfaces. Solve complex architectural problems, refactor code, mentor engineers, communicate technical direction, and develop distributed systems using cloud, big-data, and backend technologies.

Build and operate high-throughput backend services powering AI agent orchestration, connector integrations, and real-time data pipelines. Design scalable core platform services, collaborate with ML, frontend, and product teams, implement infrastructure-as-code and CI/CD, and mentor junior engineers to deliver reliable, AI-powered features.