1Inch13mo ago

Senior Software Engineer, Blockchain

Spain·MadridRemoteFull-timesenior

Software EngineerSoftware Engineering

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Quick Summary

Overview

1inch is the DeFi ecosystem building financial freedom for everyone. 1inch products help users and builders trade, hold and track digital assets - with the self-custody, comprehensive security and the intuitive user experience they need to unlock the potential of true crypto ownership.

Technical Tools

rusttypescriptci-cdcode-reviewdistributed-systemsmentoringsecurity-best-practices

At 1inch, our engineering needs evolve rapidly. We are constantly seeking exceptional Web3 and smart contract developers to join our mission.

We look for engineers with a high-agency, "Get Stuff Done" mindset and an unrelenting passion for decentralised innovation.

As part of our engineering ecosystem, you will contribute to designing, developing, and optimising the smart contracts and underlying infrastructure powering 1inch. We value sophisticated problem-solvers who can navigate the lightning-fast shifts of the crypto landscape while executing securely at scale. Working alongside our product leads and world-class engineers, your commitment to open-source excellence will keep 1inch at the absolute cutting edge of DeFi.

Design and optimise blockchain architectures with a strong focus on scalability, security, and performance

Develop, integrate, and maintain smart contracts across decentralised protocols and infrastructure components

Conduct technical research and build proof-of-concepts for new DeFi and blockchain innovations

Design and improve cross-chain interoperability solutions, including bridging and atomic swap mechanisms

Optimise smart contract execution efficiency with a focus on gas consumption and low-latency performance

Collaborate with internal and external security auditors to identify vulnerabilities and strengthen protocol security

Lead code reviews and contribute to engineering best practices, CI/CD workflows, and development standards

Mentor junior and mid-level engineers while contributing to a collaborative engineering culture

7+ years of professional software engineering experience, including 3+ years focused on blockchain development

Deep expertise in Ethereum and EVM ecosystems, including Solidity, Yul, and decentralised application architecture

Strong experience building and deploying smart contracts in production environments

Hands-on experience with Layer 2 scaling solutions and cross-chain infrastructure

Proven ability to drive architectural decisions and lead complex technical initiatives from design to deployment

Strong understanding of smart contract security principles, auditing processes, and vulnerability mitigation

Experience working in fast-paced, high-growth engineering environments

Strong problem-solving skills with a proactive, ownership-driven mindset

Experience contributing to open-source blockchain or DeFi projects

Familiarity with zero-knowledge technologies and rollup architectures

Experience building high-performance distributed systems or low-latency infrastructure

Understanding of DeFi protocols, liquidity aggregation, or on-chain trading systems

Knowledge of Web3 developer tooling and blockchain infrastructure automation

1inch is an equal opportunity employer. We are committed to evaluating all candidates on the basis of their skills, experience, and potential — regardless of race, ethnicity, nationality, gender, age, religion, disability, or any other characteristic. We believe diverse teams build better products, and we welcome applications from all backgrounds.