Senior Smart Contract Engineer

Galaxy

Senior Smart Contract Engineer designing and implementing on-chain solutions for Galaxy's multi-chain platform. Collaborating with product leadership and engineering teams in a fast-paced environment.

Posted 6/24/2026full-timeRemote • 🇺🇸 United StatesSeniorWebsite

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

SolidityRustEVM internalsgas optimizationproxy patternsupgradeability patternsformal verificationinvariant testingfuzz testingsmart contract development

Soft Skills

strong written communicationmentorshiphigh agencyjudgmentteam performance improvementownershipaccountabilityproblem-solvingcollaborationleadership

Tools & Technologies

FoundryHardhatSlitherEchidnaAnchorSolana program test frameworksCertora ProverHalmosKontrolAI tools

Industry Keywords

on-chain primitivesstaking flowsvalidator orchestrationinstitutional custodyaudit lifecycleliquid stakingvalidator economicstokenized vaultcustody integrationssettlement flows

Tech Stack

Tools & technologies

OracleRustSolidityVault

About the role

Key responsibilities & impact

Own the design and implementation of new on-chain primitives across both Ethereum and Solana, including staking flows, validator orchestration, vault strategies, exit and redemption mechanisms, and integrations with institutional custody.
Drive the audit lifecycle end to end: scoping, engaging audit firms, triaging findings, implementing remediations, and shepherding code to mainnet deployment.
Set and enforce the engineering bar within your team: testing standards, review processes, deployment runbooks, incident response, and on-call rotations for live contracts.
Partner with product and engineering leadership to translate enterprise-grade requirements — custody, compliance, settlement, operational controls — into on-chain designs that hold up to scrutiny from bank-grade counterparties.
Mentor smart contract engineers on your team and contribute to hiring, code review culture, and career development across the broader smart contract function.
Represent Galaxy's on-chain work externally where appropriate: with auditors, institutional clients, governance forums, and the broader Ethereum and Solana ecosystems.
Embrace and champion the thoughtful adoption of AI to improve team performance and business outcomes.
Leverage AI tools (e.g., generative AI, automation platforms, data copilots) to improve productivity, decision-making, and output quality in your day-to-day work.

Requirements

What you’ll need

7+ years of professional software engineering experience, with at least 4 years writing production smart contracts deployed at meaningful TVL across both Ethereum (Solidity) and Solana (Rust/Anchor).
Deep expertise in EVM internals, gas optimization, and proxy/upgradeability patterns (UUPS, Transparent, Beacon), plus a working command of Solana program development, account models, and PDA design.
A track record of shipping contracts that have cleared rigorous third-party audits (Trail of Bits, OpenZeppelin, Certora, Spearbit, Neodyme, OtterSec, or equivalent) and a working familiarity with formal verification tooling such as Certora Prover, Halmos, or Kontrol.
Fluency in the modern toolchains on both chains: Foundry, Hardhat, Slither, Echidna on the EVM side; Anchor, Solana program test frameworks, and fuzzing tools on the Solana side.
Strong testing discipline that includes invariant and fuzz testing as a default, not an afterthought.
Hands-on experience across multiple on-chain domains relevant to institutional infrastructure: liquid staking, validator economics and slashing mechanics, tokenized vault/ERC-4626 architectures, custody integrations, or settlement and redemption flows.
A security-first mindset and the judgment to know when to slow down, when to ship, and when to design for failure modes (pause mechanisms, circuit breakers, containment modes).
Demonstrated depth: you've owned complex architecture decisions end-to-end, held a high bar for code review and testing, and supported other engineers through audits, incidents, and production deployments — with or without a formal lead title.
Strong written communication; you can explain a subtle reentrancy, oracle staleness, or account validation risk clearly to engineers, auditors, product, and enterprise counterparties alike.
AI fluency. You’ve integrated AI into how you work, not as a novelty but as a significant multiplier. You can speak concretely about which tools you use, what you’ve built or accelerated with them, and where they fall short — including the specific risks of using AI-generated code in a smart contract context.
High agency. You see what needs to happen and make it happen. You’re comfortable operating with incomplete direction, taking ownership of ambiguous problems, and being accountable for outcomes — including the ones that don’t pan out. Tell us about an idea you championed and ran with.

Benefits

Comp & perks

Competitive base salary and discretionary bonus
Hybrid/Flexible Working Arrangements
Flexible Time Off (paid)
3% 401(k) company contribution
Company-paid health and protective benefits for employees, partners, and other dependents
Generous paid Parental Leave
Competitive family planning benefits for US employees
Opportunities to learn about the Crypto industry
Smart, entrepreneurial, and fun colleagues
Free daily snacks and weekly breakfasts/lunches
Employee Resource Groups
Free coaching and counseling sessions through Headspace