[Remote] Backend Engineer, Solving

Note: The job is a remote job and is open to candidates in USA. Relay is hiring a Backend Engineer for its Solving team to build and own software that generates quotes, routes trades across on-chain and off-chain venues, and fills user requests. The role focuses on improving fill success, latency, and profitability through solver engineering, integrations, and reliability tooling.

Responsibilities

• Design and iterate on the solver’s core quote-generation and pricing engine, including on-chain price feeds, swap routing (1inch, LiFi, Uniswap), and dynamic fee calculation
• Build integrations with DEXs and aggregators — writing contract-level fill calldata, handling multi-hop routes, managing slippage and gas estimation
• Build observability and reliability tooling: structured error propagation, Datadog alerting, and solver-alarms triage workflows
• Collaborate with the Protocol team to integrate new settlement primitives and support the transition to decentralized, protocol-backed liquidity
• Build custom features for payment use cases — like 1:1 stablecoins and fixed pricing on majors

Skills

• You have the ability to own complex, multi-stage pipelines (deposit detection → quote generation → fill execution → settlement)
• You have strong instincts around reliability: you write error-handling, add observability, and think through edge cases like swap failures, liquidity crises, and gas spikes
• You're comfortable with a high degree of ownership and autonomy; you drive work from idea to production
• Experience building systems that interact with on-chain protocols: querying DEX quotes, constructing swap calldata, handling transaction reverts and retries
• Strong TypeScript / Node.js backend engineering skills, most of the solver codebase is TypeScript-first
• Understanding of DeFi primitives: AMMs, liquidity pools, token routing, slippage, price impact, and MEV
• Experience with cross-chain bridging protocols or intent-based architectures
• Prior work on solver or market-making systems in a DeFi context
• Familiarity with Solana and Jupiter routing, or Bitcoin UTXO-based transactions
• Experience integrating with BullMQ, Redis-backed job queues, or similar async job infrastructure
• Track record shipping integrations with major DEX aggregators (1inch, LiFi, 0x, etc.)

Benefits

• Equity package
• Comprehensive health benefits
• Unlimited PTO policy with encouraged minimum
• Remote-first culture with emphasis on collaboration, communication, and flexibility

Company Overview

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