Software Developer

Ethereum Technologies LLC; 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

US Citizen, Green Card, H-1B, OPT-EAD, CPT, Other

We are seeking an experienced Software Developer specializing in GraphQL and Node.js to design, develop, and optimize scalable APIs and microservices. The ideal candidate will have strong expertise in GraphQL schema design, resolver optimization, API security, and backend integration.

Key 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 complexity controls to prevent N+1 issues.
• Integrate relational and NoSQL databases, including PostgreSQL, MySQL, MongoDB, and Redis.
• Integrate REST APIs, gRPC services, and third-party platforms into GraphQL data layers.
• Implement API security, including authentication, authorization, RBAC, rate limiting, and query depth restrictions.
• Troubleshoot and optimize API latency, throughput, scalability, and memory usage.
• Develop automated unit, integration, and end-to-end tests using Jest, Mocha, or Supertest.
• Collaborate with frontend teams to define API contracts and support web and mobile applications.
• Participate in code reviews, architecture discussions, and CI/CD improvements.

Required Skills

• 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.
• Familiarity with Git, CI/CD pipelines, and Agile development practices.

Preferred Skills

• Experience integrating GraphQL with React, iOS, Android, or other frontend applications.
• Knowledge of Redis and CDN/edge caching.
• Experience with production-scale API monitoring, debugging, and performance tuning.

We are an equal opportunity employer. All aspects of employment including the decision to hire, promote, discipline, or discharge, will be based on merit, competence, performance, and business needs. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, national origin, citizenship/ immigration status, veteran status, or any other status protected under federal, state, or local law.