Backend Engineer (Contract, Buenos Aires)

About Nexus

Nexus is building the foundation for verifiable finance, an economic system where every transaction, order, and settlement can be proven on-chain with cryptographic assurance. To do this we’re developing a DEX Layer 1 blockchain purpose-built for the AI economy, powered by idle compute from millions of people around the world, and verified with zero-knowledge proofs. This is finance rebuilt for the future: verifiable, scalable, and open to all.

Nexus has raised $25M in Series A funding from Lightspeed, Pantera, Dragonfly, SV Angel, and more.

Location: Remote (commutable distance to Buenos Aires)
Type: Contract

Duration: 12 months with potential for extension

We’re expanding our backend engineering team in Latin America to design and deliver the infrastructure behind Nexus’s Layer 1 and its native DEX. As a Backend Engineer, you’ll build the systems and services that make verifiable trading, settlement, and financial data possible — ensuring reliability, speed, and transparency at scale.

You’ll collaborate with protocol, product, and frontend teams in San Francisco while contributing remotely from Argentina or Mexico.

• 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.
  

• 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).
  

• 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.
  

• 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.