Back End Developer to $3000

 About Us
We are a San Francisco and Kyiv-based FinTech startup revolutionizing cryptocurrency investing. We’re currently building a cross-chain Modular Naming Service (MNS) — an identity and naming infrastructure powered by LayerZero, Web3, and the Aptos framework. Our mission is to simplify digital identity across blockchains.
 

About the Role
As a Back End Developer  you’ll work on backend systems powering our dApp, enabling seamless cross-chain identity, wallet integrations, and decentralized finance features. You’ll have the opportunity to contribute to both foundational infrastructure and product-level innovation — including future AI/ML enhancements.

Responsibilities

• Design, develop, and maintain back-end services for our cross-chain identity platform
• Integrate smart contracts and blockchain SDKs (Ethereum, Aptos, etc.)
• Collaborate with product and engineering teams to design scalable APIs (GraphQL, REST)
• Work with AWS infrastructure, CI/CD pipelines, and containerized deployments
• Research and prototype AI/ML integrations (e.g. prompt-wrapped queries to LLMs, self-hosted models)
• Stay informed on latest Web3 and blockchain standards (e.g. improvement proposals, ZK tech, DID)
• Write clean, maintainable, well-documented code with a strong emphasis on testing and performance
   

Requirements

• 3+ years of experience as a Back End or Full Stack Developer
• Strong knowledge of TypeScript and Node.js
• Experience with SQL or NoSQL databases
• DevOps skills, especially with Docker, AWS, and Terraform
• Familiarity with Ethereum, smart contracts, Web3, and DeFi
• Exposure to LayerZero and/or Aptos is a strong plus
• Experience with large-scale applications, system design, and scalable APIs
• Understanding of data structures, algorithms, and OOP
• Bonus: Experience with AI/ML, prompt engineering, or LLM integration
• English: Upper-intermediate level
   

Tech Stack

• Languages & Frameworks: Node.js, TypeScript, ExpressJS, Apollo GraphQL
• Databases: Firestore, MySQL
• Infrastructure: AWS, Docker, GitHub Actions
• Blockchain: Ethereum, Aptos, LayerZero
• AI/ML: LLMs (OpenAI, custom wrapped queries), with plans for self-hosted models
• Tools: GitHub, Jira, Confluence
   

Salary: $2,500 – $3,000 USD/month depending on experience