Senior Web3 Backend Developer

About us 
The Hashgraph Association (THA) is a global organization headquartered in Switzerland and is a part of the Hedera Hashgraph (“Hedera”) ecosystem. 
 
Hedera is a revolutionary proof-of-stake public Distributed Ledger Technology (DLT) network that is fast emerging as the gold standard in DLT for enterprise-grade solutions and decentralized applications (dApps). Hedera is governed by a council of the world’s leading organizations - which include Google, Boeing, IBM, Dell, Deutsche Telekom, LG, Abrdn, London School of Economics, to name a few. 
 
THA works closely with enterprises, startups, governments, and academic and training institutions around the world to deliver financing, custom-design solutions, and professional training and innovation programs, aimed at accelerating the development and utilization of the Hedera Hashgraph network. 
As we undergo rapid expansion, we are establishing offices in strategic locations worldwide. We are currently seeking a skilled Web3 Backend Developer to join our innovative engineering team. In this role, you will be responsible for developing robust backend infrastructure for our decentralized applications using TypeScript and NestJS.

Key Responsibilities

• Design and implement API endpoints using NestJS with TypeScript

• Document API specifications using OpenAPI (Swagger)

• Develop comprehensive test suites including:

  • Unit tests

  • Integration tests

  • End-to-end (e2e) tests using Jest or Vitest

• Manage database connections and schema migrations in NestJS

• Interact with Ethereum Virtual Machine (EVM) smart contracts

• Create and manage blockchain transactions

• Collaborate with frontend and blockchain teams to ensure seamless integration

Required Skills

• Expert-level TypeScript programming

• Advanced NestJS framework experience

• Proficiency in database connection and migration tools

• Understanding of blockchain transaction mechanisms

• Strong knowledge of testing frameworks (Jest/Vitest)

• Experience with API documentation tools like Swagger

• Familiarity with EVM and blockchain ecosystems

Technical Stack

• TypeScript

• NestJS

• Jest/Vitest

• OpenAPI/Swagger

• Ethereum blockchain

• Database migration tools

Bonus Points

• Previous Web3 backend development experience

• Understanding of decentralized application architectures

• Knowledge of smart contract interactions