Top Backend Engineer Jobs in Seattle, WA

Looking for a Back-End Developer specializing in PHP and Laravel with at least 3 years of experience to work on backend development and optimize user experience.

Backend-focused engineer to develop and own core CRM and finance services end-to-end. Work in a fast-growth scaleup environment, shipping with agentic AI-assisted workflows, maintaining production Python/FastAPI services, owning testing and quality, and optimizing developer tooling and automation.

Develop, maintain, and optimize mission-critical backend APIs and scalable cloud services for web and mobile clients. Implement secure, high-performance systems, automated tests, observability, and technical documentation. Mentor peers, follow best practices, and support a proof-of-concept launch and fundraising activities as a volunteer contributor.

Design, build, test, and support EPIC integration solutions across the full interface lifecycle. Gather requirements, resolve integration issues, develop standards and documentation, and provide production support within a remote, volunteer, part-time setup.

Design and implement scalable backend services and APIs for SwapRail, including routing engines, execution services, data pipelines, simulation/validation layers, and observability. Integrate on-chain and off-chain data sources, optimize for low-latency high-throughput execution, and collaborate with frontend and wallet teams.

As a Backend Engineer, design and manage backend infrastructure, develop microservices, optimize data systems, collaborate with teams, and participate in on-call rotations.

The role involves building and scaling platform components, collaborating with product teams, and setting technical direction for features. Requires experience in backend engineering.

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

The Backend Engineer will design, build, and scale Veda's backend systems, ensuring reliability and performance for DeFi applications.

Develop and maintain backend services using TypeScript and Bun.js for a crypto trading platform, focusing on performance and collaboration across teams.

As a Staff Backend Engineer, you'll design and maintain scalable backend services using TypeScript, ensuring high performance and reliability for a large user base, while collaborating with co-founders and leading a team.

The Senior/Lead Backend Engineer will develop backend infrastructure for a renewable energy company, including real-time digital twin creation and energy app backend development.

As a Staff Software Engineer, you'll lead the technical direction of the Session Replay product, driving backend architecture, designing data models, and improving team engineering standards while mentoring engineers.

Build and maintain API services for a decentralized exchange, design and implement trade routing logic for optimized cross-chain swaps, integrate features with cross-functional teams, monitor system performance and reliability, and troubleshoot trade execution and API issues.

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.

Lead Backend Engineer responsible for high-profile projects using backend technologies, team leadership, and deployment of scalable applications. Requires 10+ years of experience in software development, particularly with C# and .NET and cloud services.

Staff Backend Engineer responsible for leading complex engineering projects, designing scalable systems, mentoring junior engineers, and enhancing platform performance at Socure.

Lead design, build, and maintenance of scalable, secure blockchain participation and custody infrastructure. Improve automation, monitoring, incident response, and observability; debug distributed protocols; inform leadership strategy; scope product opportunities; and support on-call reliability and deployment automation.

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.

Lead the design of a distributed backend streaming engine with a focus on high availability and AI integration, ensuring low latency and high throughput.

Lead architecture and implementation of conversational AI systems, build scalable backend services and REST APIs, drive high-impact projects, integrate external partners and carriers, collaborate with Data Science on ML/LLM solutions, and ensure platform performance and scalability.

Design, build, and maintain backend workflow orchestration and state management for analyzer integrations on the ECL platform. Modernize legacy .NET systems, ensure reliable event-driven operations, collaborate with integration, infrastructure, and QA teams, and preserve workflow behavior during knowledge transfer.

The Back-end Engineer will develop and maintain services and APIs, design data models, and contribute to system stability, collaborating with other engineers and product managers.

The Senior Platform Backend Engineer will design and operate AWS-based systems, focusing on backend services for data platforms and analytics, while ensuring reliability and operational excellence.