Implement components across the on-chain transaction lifecycle, including calldata construction, signing requests, and nonce management.
Build new features within the institutional custody signing pipeline, including submission paths and asynchronous transaction handling.
Write comprehensive automated tests for backend services and smart contracts, and participate in an on-call rotation.
Cari is building blockchain-based payment infrastructure that enables real-time, 24/7 movement of digital money across traditional financial institutions and the digital asset ecosystem. As a pre-launch startup, they offer a remote-first environment with close collaboration from an experienced founding and engineering team.
Design and build transaction parsing, validation, and broadcasting infrastructure across multiple blockchain protocols
Develop and maintain protocol-specific libraries and abstractions that power Turnkey's transaction management layer
Collaborate effectively across the company to design and deliver core product capabilities
Turnkey is developer-first infrastructure for private key management, making it simple to create wallets, sign transactions, and automate on-chain actions. The team is low-ego, high-agency, and high-autonomy, with significant experience in cryptography, security, and low-level systems.
Design and implement scalable backend services and APIs for cryptocurrency swapping.
Build routing and aggregation logic for swap execution across multiple liquidity sources.
Integrate on-chain and off-chain data sources (RPC nodes, indexers, third-party APIs).
Biti Pro is a company building core backend systems for cryptocurrency swapping and DeFi aggregation. They are a small team focused on high-performance, scalable services.
Design, develop, and operate ledger and payments services for accurate crypto and fiat money movement.
Build scalable APIs and data models to support new transaction types while ensuring correctness and auditability.
Partner with cross-functional teams and mentor teammates to deliver production-grade code.
Gemini is a global crypto and Web3 platform founded by the Winklevoss twins, offering secure crypto products in over 70 countries. The publicly traded company emphasizes building diverse teams and fostering an open, fair, and secure cryptoeconomy.
Build internal and first-party applications on Tempo for agents and humans.
Partner with startups and enterprises to integrate Tempo into their payment systems.
Develop deep understanding of Tempo blockchain, navigate codebases, and ship products across customer environments.
Tempo is a layer-1 blockchain built for stablecoins and real-world payments, originating from Stripe's payment expertise and Paradigm's crypto tech. We're a team of crypto-optimists building infrastructure for onchain economic flows, moving fast with design partners like Anthropic, DoorDash, and Visa.
Design and implement new features within the Data Product space, including trust-minimized off-chain computation and aggregation of external data in blockchain environments.
Own end-to-end delivery of data products that power the largest market share of DeFi by total value secured.
Build core products with Smart Contracts using Solidity, Move, and Rust.
Chainlink is the industry-standard oracle platform bringing capital markets onchain and powering the majority of decentralized finance. The company has enabled tens of trillions in transaction value and fosters a collaborative, autonomous engineering culture.
Own transaction processing platform infrastructure for signing and settlement flows, including service design and operational health.
Design data models, API contracts, and retry/backoff logic; write RFCs relied on by Banking and Blockchain engineers.
Define production readiness with SLOs, alerting thresholds, and runbooks; lead incident response and postmortems.
The Cari Network builds blockchain-based payment systems for real-time digital money movement across finance and digital assets. As a pre-launch startup, we are creating new financial infrastructure bringing cash on chain through tokenization.
Build and operate Go backend services for key management and signing at scale.
Design and implement cryptographic recovery and trust models for non-custodial wallets.
Work with external auditors, Kubernetes, and distributed systems in a security-critical environment.
Offchain Labs builds the Arbitrum stack, the leading Ethereum scaling solution. They are a well-funded company with $124 million in backing, a small but high-ownership team, and a culture of security-first engineering and collaborative review.
Lead an engineering team responsible for delivering reliable, scalable infrastructure supporting the Data Feeds product.
Partner with Product and technical leadership to translate strategic priorities into well-executed engineering roadmaps.
Provide engineering judgment to support the team in making sound architectural and operational decisions.
Chainlink is the industry-standard oracle platform bringing the capital markets onchain and powering the majority of decentralized finance (DeFi). Since inventing decentralized oracle networks, Chainlink has enabled tens of trillions in transaction value and now secures the vast majority of DeFi.
AnaVation is the leader in solving complex technical challenges for the U.S. Federal Intelligence Community, delivering groundbreaking research and advanced software and systems engineering. We are a US-owned company headquartered in Chantilly, Virginia, offering a top-notch work environment and a collaborative team culture.
Build backend systems for billing and revenue management within a full stack engineering team.
Drive medium-to-large projects, break down tasks, estimate scope, and coordinate cross-functional efforts.
Mentor team members, share knowledge, and communicate across teams to solve complex problems.
Anchorage Digital is a crypto platform enabling institutions to participate in digital assets through custody, staking, trading, and security infrastructure. With over 600 employees and backed by investors like Andreessen Horowitz, Goldman Sachs, and Visa, the company values a welcoming and inclusive culture.
Work on features to increase speed and functionality of trading infrastructure, including new algorithms and exchange integrations.
Play an active role in executing system architecture and roadmap, collaborating with Product Management.
Grow to become an expert in entire trading systems and use deductive reasoning to solve complex problems.
sFOX is a full-service prime dealer that unites liquidity from over 30 exchanges and OTC desks. Founded in 2014, the company is backed by prominent investors and has a rapidly growing team.
Build and maintain distributed systems for custody of digital assets, including cash, coins, NFTs, and staking.
Lead medium-to-large projects, breaking down tasks, estimating scope, and ensuring code quality and testing.
Collaborate cross-functionally, mentor team members, and share knowledge to avoid single points of failure.
Anchorage Digital builds a digital asset platform for institutions to participate in crypto through custody, staking, and trading. Founded in 2017, it has over 600 employees and is valued over $3 billion, with a culture focused on security and inclusion.
Set the product direction and roadmap for margin financing & securities lending and clearing & settlement systems.
Own the architecture design of clearing and settlement systems, including trade clearing, position and balance settlement, multilateral netting, fee and interest settlement, and reconciliation.
Improve core margin systems including collateral valuation, cross/isolated margin logic, interest accrual, borrow/lend flows, and liquidation handling.
Binance is a leading global blockchain ecosystem behind the world’s largest cryptocurrency exchange by trading volume and registered users. They are trusted by 300+ million people in 100+ countries, with a flat structure and diverse workforce.
Conduct technical research on new blockchain and DeFi projects to identify architecture risks and security gaps.
Deconstruct attack logic and exploit techniques to develop actionable detection rules and security strategies.
Collaborate with the wallet team to implement security measures balancing robust protection with user experience.
Binance is a leading global blockchain ecosystem behind the world's largest cryptocurrency exchange by trading volume and registered users. They are trusted by over 300 million people in 100+ countries and offer a diverse, inclusive work environment with a flat structure.