Blockchain Engineer

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 Location: Remote (Argentina)Type: ContractDuration: 12 months with potential for extension The Role We’re hiring Blockchain Engineers in Latin America to work at the core of Nexus’s execution stack — contributing to the runtime behind our Layer 1 protocol and the high-performance engine that powers decentralized trading. This is not a typical backend role. You’ll design, implement, and optimize all layers of the Nexus protocol stack — including consensus, execution, and API/RPC servers — while helping define new financial and trading primitives on the Nexus L1. You’ll work on performance‑critical systems where microseconds matter, building execution paths that may evolve into core protocol primitives. Whether you’re a strong mid‑level engineer ready to grow into system ownership or a senior/principal engineer eager to architect high‑throughput distributed systems, this role offers the opportunity to build software that runs at the heart of a global execution layer. You’ll collaborate closely with protocol, cryptography, and product teams in San Francisco while contributing remotely from Argentina. What You’ll Do Design and implement high-performance execution components in Rust, C++, or Go for Nexus’s blockchain runtime and DEX engine. Build low-latency pipelines for transaction execution, order matching, event propagation, and state updates. Optimize concurrency models, scheduling, memory layout, and I/O paths for determinism and throughput. Contribute to execution abstractions that may become core blockchain protocol primitives. closely with protocol engineers to ensure safety, composability, and consensus compatibility. Investigate and resolve performance bottlenecks using profiling, tracing, and benchmarking tools. Help define engineering standards for correctness, reliability, and high-assurance execution. For senior/principal engineers: drive system design decisions, shape execution architecture, and mentor others in performance engineering. What We’re Looking For Strong experience with Rust, C++, Go, or other systems programming languages. Hands‑on experience with blockchain protocols, execution layers, or runtimes (Layer 1 or Layer 2). Solid understanding of high-performance or distributed systems (e.g., low-latency engines, runtimes, databases). Ability to reason about execution flows, concurrency models, resource lifecycles, and system invariants. Practical experience profiling CPU, memory, and synchronization overhead. Comfort working close to runtime constraints where performance, determinism, and resilience are critical. Excellent communication skills in Business English (spoken and written). Bonus Points Experience building matching engines, blockchain runtimes, databases, compilers, or HPC systems. Familiarity with lock-free concurrency, zero-copy data structures, or cache-aware design. Exposure to consensus systems, transaction ordering, or protocol-level execution. Background in correctness-focused engineering (formal verification, static analysis). Open-source contributions to systems-level or blockchain infrastructure projects. Why Join Us Build the execution backbone of a Layer 1 blockchain and next-generation DEX engine. Work on systems where your optimizations translate directly into global performance gains. Grow from mid-level contributor to system owner — or drive execution architecture as a senior/principal. Shape primitives designed to last — correct, performant, and potentially enshrined at the protocol level. Join a high-performance engineering culture where ambition and deep technical work are expected. #J-18808-Ljbffr