🌍 Remote (Asia–Europe overlap) 📄 Contractor, full-time 💰 Monthly base + quarterly profit-sharing 👤 Reports to CTO/Co-Founder 👥 ~8-person team 🌏 About anyIP anyIP.io is a fast-growing proxy provider — affordable, high-quality residential and mobile proxies in 190+ countries. Built by engineers, loved by power users. We're an AI-first company: we lean on AI across the whole stack — coding, reviews, debugging, ops, and tooling — to ship faster and punch far above our size. You'll be expected (and encouraged) to wield it daily. 🔥 The role Be the technical owner of our proxy platform: a 100% async Rust codebase (~50k lines, multi-repo) doing tens of millions of requests/day. The core is a hard distributed-systems problem — we coordinate a churning fleet of devices running our server as proxy and route live customer traffic through them over custom TLS + custom protocols. Your job: keep that fleet fast, reliable, and byte-accurately billed. This is a hands-on lead role. You'll mostly design, code, review, and debug production systems — not manage a large team. 🛠️ What you'll own * 📡 Peer-fleet coordination & reliability — lifecycle, keep-alive, health checks, circuit breakers, zombie-peer detection, QoS-aware archiving * 🔌 Core protocol work — proxy, SOCKS5, UDP, QUIC, and load balancing under real traffic * 💵 Usage-metering correctness — every byte billed once across HTTP/CONNECT/SOCKS5 TCP+UDP and client aborts, verified by E2E tests * 🛡️ Security & abuse prevention — domain/SSRF/rate-limit policy, anti-DDoS, per-datagram checks on UDP (incl. QUIC SNI for HTTP/3) * 📊 Reliability & observability — profiling, hot-path tuning, Prometheus/tracing, taming RabbitMQ event pressure * 🧩 Clean service contracts (gRPC, binary protocols), CI/CD, Helm/K8s delivery, and code review 🧠 What we're looking for * 5+ years professional Rust, with Tokio mastery * Senior/lead experience on backend, infra, or systems work * Strong async/concurrency, performance tuning, and low-level instincts * Solid TCP/UDP/multiplexer and protocol design knowledge (Protobuf, Bincode, raw) * Security mindset (TLS, cryptography) and calm production-debugging skills * Architectural judgment — you simplify systems, not just add to them * 🤖 Fluent with AI dev tools — you use them to move faster and amplify your judgment, not replace it * Clear English; Asia–Europe time-zone overlap ✅ Big pluses * SOCKS5 & PROXY protocols * QUIC/UDP * RabbitMQ * gRPC * Kubernetes/Helm * MongoDB/Redis Cluster * E2E test design * mentoring 🚀 Why join Genuine ownership, full autonomy, clear path to senior leadership. Low-level systems work with immediate production consequences — billing accuracy, abuse prevention, uptime under real traffic. Most backend jobs never touch this depth — and you'll do it on an AI-first team that ships fast. 🎁 Perks * 20 days paid leave · * 5 sick days * USD 800/yr office expenses * quarterly profit-sharing ⏱️ Process Application → 30-min intro call → take-home challenge → 1–3 founder interviews → offer. We move fast. Ready to own a mission-critical system and build the proxy platform developers love? Apply now and let’s ship something great together.