Similarweb
Senior Fullstack Engineer
Overview
We are looking for a Senior Fullstack Engineer with a strong backend orientation (80%) to join the development of our scalable, AI-powered product systems, combining deep backend expertise with solid frontend fluency and product thinking.
About Similarweb
At Similarweb, we are revolutionizing the way businesses interact with the digital world by revealing to them everything that happens online. Our unique data and solutions empower over 4,300 customers globally, including industry giants like Google, eBay, and Adidas, to make game-changing decisions that drive their digital strategies. In 2021, we w
Requirements & Eligibility
- 5+ years of Full stack or Backend engineering experience, with a strong backend focus (80%) - Must
- Strong proficiency in Node.js, TypeScript, and NestJS; Python proficiency also welcome (or equivalent backend framework) - Must
- Solid working proficiency in React and modern frontend fundamentals (HTML, CSS)
- Experience designing scalable backend architectures and data models
- Deep understanding of API design, authentication flows, and distributed system tradeoffs
- Experience with relational and/or NoSQL databases, including query optimization
- Strong understanding of system performance, reliability, and security best practices
- Experience with testing methodologies (unit, integration, E2E) and observability tooling
Key Responsibilities
- Design and build scalable, maintainable backend services using NestJS (Node.js/TypeScript) and/or Python
- Own API design, contracts, and versioning across services
- Design and optimize data models, database schemas, and query performance
- Implement authentication, authorization, and secure API integration patterns
- Build reliable data-fetching layers, caching strategies, and async processing (queues, jobs, events)
- Lead backend technical decisions, code quality standards, and system architecture
- Ensure system scalability, fault tolerance, and observability (logging, monitoring, alerting)
- Contribute to CI/CD pipelines and deployment practices for backend services
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