Low-Latency Arb Developer (Blockchain)

As a Low-Latency Arb Developer at AP Capital, you design and build a multi-venue HFT arbitrage platform that trades across blockchains at scale. You own the full stack from market data ingestion and order-book normalisation through opportunity detection, multi-leg execution, and hedging, cutting tick-to-trade latency through co-location, network optimisation, and on-chain execution speed.

What you'll do

• Design the multi-venue HFT arbitrage platform: market data, order-book normalisation, opportunity detection, multi-leg execution and hedging
• Cut tick-to-trade latency to each venue through co-location, cloud-region placement, network/route optimisation and WebSocket/API tuning
• Speed up on-chain execution through self-hosted nodes, RPC and transaction propagation
• Profile and remove latency, jitter and throughput bottlenecks across network, kernel, serialisation and event loops
• Handle partial fills, leg risk, rate limits and venue outages
• Build monitoring, kill switches and alerts

What you bring

• 2+ years building trading systems for a blockchain HFT or trading firm (market maker, prop shop, arbitrage desk). Exchange-side or TradFi-only backgrounds are not suitable
• Hands-on experience with network-level latency: co-location near exchange matching engines, network/route optimisation, NIC/socket tuning
• A proven record of reducing latency in live production, with measurable numbers (µs/ms)
• Experience building systems connected to multiple CEXs/DEXs simultaneously
• C++ or Rust required. Python or Go is a plus
• Low-latency skills: CPU pinning, lock-free structures, ring buffers, async event loops
• Bachelor's degree in CS, Engineering, Maths or a related field

Strongly preferred

• Cross-exchange arbitrage experience (CEX-CEX / CEX-DEX)
• Self-hosted nodes (Hyperliquid, Solana, EVM) built to speed up execution
• Knowledge of perpetuals, funding, fees and rebates