Backend Engineer, Solving
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AI Summary
About us
Relay is a cross-chain payments protocol that provides instant, low-cost cross-chain bridging, swaps, and transactions. We're the fastest and cheapest way to bridge and transact across chains, serving over 5 million users who have completed 59+ million transactions with $6+ billion in volume across 85+ chains.
Our company mission is to make transacting across chains as fast, cheap, and reliable as online payments. We are building the core infrastructure to abstract chains from end user payments, enabling the next billion users to experience the benefits of blockchain without the UX burdens.
About the role
The Solving team is the engine behind Relay’s ability to execute requests with the best price and highest reliability. As a Solving Engineer, you will build and own the software that generates quotes, routes trades across on-chain and off-chain venues, and fills user requests end-to-end. This is a high-impact, high-ownership role: your work directly affects fill success rates, latency, and the profitability of Relay’s solver business.
What you'll do
Extend Relay’s support to new chain VMs by writing and auditing on-chain contracts
Own the chain integration layer, including settlement contracts, multisig infrastructure, and the on-chain allocator
Design and implement trust-minimized settlement flows, moving the protocol toward fully verifiable, decentralized settlement
Collaborate with the Solving team to ensure protocol primitives support efficient quote generation, just-in-time liquidity, and optimal routing
Investigate and resolve protocol-level incidents, including RPC failures, oracle timeouts, and settlement job errors
Contribute to open-source protocol specifications and developer documentation
About you
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
Skills and abilities
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
Nice to have
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.)
What we offer
Competitive base salary
Equity package
Comprehensive health benefits
Unlimited PTO policy with encouraged minimum
Remote-first culture with emphasis on collaboration, communication, and flexibility
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