Backend Engineer (Contract, Brazil)

**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 (Brazil) Type: Contract Duration: 12 months with potential for extension The Role 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 Brazil. 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.