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Urgent! Backend Engineer (Contract, Buenos Aires) Position in Comuna 1 - Nexus

Backend Engineer (Contract, Buenos Aires)



Job description

Overview

Backend Engineer (Contract, Buenos Aires) at Nexus.

Nexus is innovating at the intersection of artificial intelligence, blockchain, and zero-knowledge cryptography to build a Layer 1 for the AI era.

Our team is developing the Nexus Layer 1 blockchain, Nexus zkVM, and other breakthrough products with the goal of creating a verifiable financial world.

Location: Remote (commutable distance to Buenos Aires)
Type: Contract
Duration: 12 months with potential for extension

What You’ll Do

  • Design and build backend services in Node.js and Rust for Nexus’s Layer 1 and DEX.

  • Develop APIs and data pipelines for trading, liquidity, and on-chain verification.

  • Build and maintain blockchain infrastructure components (RPC endpoints, explorers, dev tools).

  • Optimize performance and scalability across distributed systems.

  • Collaborate with frontend engineers to define data contracts and API interfaces.

  • Write clean, well-tested code that supports verifiable financial applications.

What We’re Looking For

  • Strong experience developing backend systems in Node.js, Rust, or similar languages.

  • Proficiency with PostgreSQL, Prisma, or equivalent data stores.

  • Understanding of API design, authentication flows, and performance optimization.

  • Experience with distributed systems, financial infrastructure, or blockchain.

  • Excellent communication skills in Business English (spoken & written).

Bonus Points For

  • Experience building or scaling financial systems (exchanges, payments, clearing).

  • Familiarity with blockchain architectures, smart contracts, or consensus protocols.

  • Exposure to DevOps tooling (Docker, Kubernetes, Terraform, AWS).

  • Experience in high-performance or low-latency system design.

Why Join Us

  • Build the backend systems powering the Layer 1 for Verifiable Finance.

  • Collaborate with experts across blockchain, AI, and financial infrastructure.

  • Shape the foundation for a verifiable, transparent, global trading system.

  • Thrive in a fast-moving, high-impact engineering environment.

Details

  • Seniority level: Entry level
  • Employment type: Contract
  • Job function: Engineering and Information Technology
  • Industries: Software Development

Referrals increase your chances of interviewing at Nexus by 2x.

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