Pixora Core Backend Engineer – Web3 Platform

You will own Pixora's Node.js backend: the APIs, file uploads, data and infrastructure behind the marketplace. This is a pure backend role: blockchain and smart contract experience is not required. What you'll do - Design, build and maintain REST APIs in Node.js (Next.js API routes today, with room to grow into a dedicated service). - Own file and image uploads: validation, size and type limits, storage, and delivery through a CDN or storage gateway. - Keep the platform secure: authentication, authorization, secret and credential management, input validation, rate limiting. - Design data models and caching so the marketplace stays fast as the number of listings and users grows (pagination, search, sorting). - Set up logging, monitoring and error tracking, and keep services reliable in production. - Write automated tests for your APIs and run them in CI. - Work with the Frontend Engineer to design clean, well-documented API contracts. What you'll need - 3+ years of professional backend experience with Node.js. - Strong JavaScript; TypeScript experience is a plus. - Experience building production REST APIs with Express, Fastify, NestJS or Next.js API routes. - Solid knowledge of at least one database (PostgreSQL, MySQL or MongoDB) and of caching with Redis or similar. - A strong grasp of web security: OWASP Top 10, secret handling, authentication (JWT, sessions, OAuth), input validation. - Experience writing tests with Jest, Mocha or Vitest, and using Supertest or similar for API testing. - Comfort with Git, code review, and writing clear technical notes. Nice to have - Experience with cloud file storage (AWS S3, Cloudflare R2, IPFS) and image processing. - Message queues or background jobs (BullMQ, RabbitMQ, SQS). - Docker, CI/CD pipelines, and deploying to Vercel, AWS or Cloudflare. - API documentation with OpenAPI / Swagger. - Experience on a marketplace, e-commerce or creator platform.