Senior Fullstack Engineer – Node.js, React

Description

• Fully own the entire backend of Symbiotic: architecture, services, APIs, databases, performance, reliability, and observability • Design and build new services from scratch with zero hand-holding • Take complete responsibility for everything you ship: you are the go-to person for any question or issue related to your code • Ruthlessly focus on delivering maximum value; challenge requirements when needed • Write exceptionally clean, simple, and over-documented code • Jump into React frontend work whenever required (we’re a small team; speed > strict boundaries) • Proactively propose valuable features and improvements • Collaborate closely with the team, accept feedback openly, and mentor others when needed • Ensure everything is thoroughly tested and production-ready (monitoring, logging, error tracking, security) • Continuously improve performance, scalability, and developer experience across the stack

Requirements

• 4+ years of production experience as a backend or fullstack engineer • Expert in JavaScript and Node.js internals (event loop, streams, memory model, async primitives) • Proven track record independently designing and shipping complete backend services end-to-end • Strong production experience with modern Node.js frameworks (Fastify, Hono, Elysia, Express, NestJS) • Advanced PostgreSQL skills: schema design, indexing strategy, query optimization, transaction handling • Strong React + TypeScript frontend background • Docker-native, comfortable with CI/CD (GitHub Actions), basic Kubernetes knowledge • Obsessed with clean, simple, heavily documented code; you write extensive tests and love helping QA with edge-case scenarios • Excellent at algorithms and data structures • Startup mindset: you jump into frontend, infra, or anything else needed to move the product forward • Deeply care about business impact and always understand the “why” behind what you build • Bonus: Web3 experience (EVM, ethers.js/viem, RPC providers, indexing) or working knowledge of Go/Python

Benefits

• No contractors, traditional employment agreement

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