Senior GraphQL & Node.js API Engineer

Ethereum Technologies; Sunnyvale (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Ethereum Technologies in Sunnyvale, CA, seeks an experienced Software Developer specializing in GraphQL and Node.js to design, develop, and optimize scalable APIs and microservices.

You will work on GraphQL schemas, resolvers, and federation, performance tuning with DataLoader, and integrating SQL/NoSQL databases, REST/gRPC APIs, and security controls. Collaboration with frontend teams and CI/CD improvements are core parts of the role.

Qualifications

• Strong hands-on experience with GraphQL API development and Node.js.
• Experience with GraphQL schemas, resolvers, queries, mutations, subscriptions, and API integration.
• Knowledge of Apollo Server, Apollo Federation, DataLoader, and caching strategies.
• Experience with SQL/NoSQL databases and REST/gRPC integrations.
• Understanding of API security, performance optimization, automated testing, and microservices architecture.

Responsibilities

• Design, develop, and maintain GraphQL APIs, including schemas, queries, mutations, and subscriptions.
• Implement schema federation or stitching using Apollo Federation or similar technologies.
• Optimize GraphQL performance using DataLoader, batching, caching, and query depth controls.
• Integrate relational and NoSQL databases and REST/gRPC APIs into GraphQL layers.
• Ensure API security, monitoring, and CI/CD improvements.

Skills

GraphQL API development

Node.js

API security

DataLoader / caching

CI/CD & Git

Tools

Apollo Server

Apollo Federation

DataLoader

SQL/NoSQL

Job description

Ethereum Technologies in Sunnyvale, CA, seeks an experienced Software Developer specializing in GraphQL and Node.js to design, develop, and optimize scalable APIs and microservices.

You will work on GraphQL schemas, resolvers, and federation, performance tuning with DataLoader, and integrating SQL/NoSQL databases, REST/gRPC APIs, and security controls. Collaboration with frontend teams and CI/CD improvements are core parts of the role.