Software Engineer, all levels (Blockchain)
1inch · Madrid, Community of Madrid, Spain
This listing has closed — view similar roles below.
- Hybrid
- Full-time
- $150,000 / year
- Madrid, Community of Madrid, Spain
Job highlights
- Design and optimize blockchain architecture.
- Develop and audit smart contracts.
- Research and implement blockchain best practices.
- Collaborate on innovative DeFi solutions.
- Work remotely or in Dubai hub.
About the role
About 1inch
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. 1inch protocols and APIs provide core infrastructure across the DeFi industry and beyond.So if you’re someone who thinks big, moves fast and wants to make an impact right from day one, then get ready to join our industry-changing team.
We're looking for multiple Blockchain Engineers with various levels of experience, a "Get Stuff Done" mentality and a passion for innovation. As a key member of our team, you'll be responsible for designing, developing, and optimising smart contracts and blockchain infrastructure. This role requires a strong problem-solver who can navigate the constant changes of the crypto market while executing quickly and maintaining a high standard of security and quality.
You'll work closely with the CPO, product teams, and other engineers to deliver innovative and secure solutions within the DeFi ecosystem. Your commitment to decentralisation and open-source development will be essential in helping us stay ahead of industry trends and build a platform that is robust and forward-thinking.
Responsibilities
- Designing and optimising blockchain product architecture, with a focus on scalability, security, and performance
- Leading the development, auditing, and integration of smart contracts within decentralised protocols
- Conducting technical research and proof-of-concept (PoC) experiments, while implementing best practices in blockchain development
- Developing and improving cross-chain interoperability solutions, such as cross-chain swaps and bridges
- Designing and developing efficient algorithms, with a focus on gas optimisation
- Defining and implementing effective CI/CD processes for blockchain development
- Analysing and addressing potential attack vectors and ensuring security best practices
- Continuously monitoring emerging blockchain, Web3, and crypto technologies
- Performing rigorous code reviews, mentoring developers, and enforcing best practices in blockchain engineering
- Collaborating with auditors and cross-functional teams to ensure successful product launches
Requirements
- 4+ years of software development experience, with at least 2+ years in blockchain engineering
- Deep understanding of blockchain ecosystems, smart contracts (Solidity, Yul, EVM), and decentralized applications (dApps)
- Hands-on experience with Ethereum, Layer 2 solutions (Optimistic & ZK Rollups), and cross-chain protocols (atomic swaps, bridges, etc.)
- Proven track record in technical leadership, architectural decision-making, and mentoring development teams (Senior Level and above only)
- Strong background in blockchain security and experience with smart contract audits
Skills
- Proficiency in Solidity, Yul, Rust, TypeScript
- Experience with smart contract development and deployment frameworks (Foundry, Hardhat)
- Understanding of DeFi protocols, AMMs, liquidity pools, and oracle integrations
- Expertise in blockchain security principles and smart contract auditing methodologies
- Experience in building high-performance distributed systems
Why you'll love working with us
- Join a young, creative team in a fast-paced and supportive environment
- We’re open to new ideas — if you’ve got a vision, pitch it and make it happen
- Enjoy competitive pay that matches your skills and experience
- Be part of a company that’s shaping the future of DeFi
- Take time when you need it — we offer unlimited vacation days
- Get fully compensated for your work gear — we’ll set you up for success
Hiring Process Note
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.Key skills/competency
- Blockchain Architecture
- Smart Contract Development
- DeFi Protocols
- Blockchain Security
- Cross-chain Interoperability
- Solidity Development
- EVM
- Layer 2 Solutions
- Code Auditing
- Distributed Systems
Skills & topics
- Blockchain Engineer
- Software Engineer
- DeFi
- Smart Contracts
- Solidity
- EVM
- Ethereum
- Layer 2
- dApps
- Web3
- Crypto
- Security
- Architecture
- Full-time
- Remote
- Dubai
How to get hired
- Tailor your resume: Highlight blockchain engineering experience and specific skills like Solidity and EVM.
- Showcase your projects: Emphasize your contributions to dApps, smart contracts, or DeFi protocols.
- Demonstrate innovation: Prepare to discuss your passion for decentralization and open-source development.
- Address the 'Get Stuff Done' mentality: Provide examples of rapid execution and high-quality results.
- Highlight security expertise: Detail your experience with blockchain security and smart contract audits.
Technical preparation
Master Solidity and EVM intricacies.,Practice gas optimization techniques.,Build and audit smart contracts.,Understand Layer 2 scaling solutions.
Behavioral questions
Describe a complex blockchain problem solved.,How do you handle rapid market changes?,Give an example of driving innovation.,How do you ensure high-quality code?
Frequently asked questions
- What are the primary responsibilities of a Software Engineer Blockchain at 1inch?
- As a Software Engineer Blockchain at 1inch, you will be responsible for designing and optimizing blockchain product architecture, leading smart contract development and auditing, conducting technical research, developing cross-chain interoperability solutions, and ensuring blockchain security best practices.
- What specific blockchain technologies and ecosystems is 1inch focused on?
- 1inch is deeply involved in the DeFi ecosystem, with a focus on Ethereum, Layer 2 solutions like Optimistic & ZK Rollups, and cross-chain protocols. Experience with smart contracts (Solidity, Yul, EVM) and decentralized applications (dApps) is crucial.
- Does 1inch offer remote work opportunities for this Blockchain Engineer role?
- Yes, 1inch considers candidates working remotely, prioritizing those within +/- 4 hours GST time. Candidates based in Dubai are also strongly preferred.
- What level of software development experience is required for the Blockchain Engineer position at 1inch?
- The role requires 4+ years of overall software development experience, with a minimum of 2+ years specifically in blockchain engineering. Senior levels require proven technical leadership and architectural decision-making experience.
- How important is blockchain security and smart contract auditing for this role?
- Blockchain security and smart contract auditing are critical. You will be analyzing potential attack vectors, ensuring security best practices, and collaborating with auditors, so a strong background in these areas is essential.
- What are the key programming languages and frameworks for a Software Engineer Blockchain at 1inch?
- Proficiency in Solidity, Yul, Rust, and TypeScript is expected. Experience with smart contract development and deployment frameworks such as Foundry and Hardhat is also highly valued.
- What kind of team environment can I expect at 1inch?
- You can expect to join a young, creative team in a fast-paced and supportive environment where new ideas are welcomed and encouraged. The company is committed to decentralization and open-source development.
- Does 1inch use AI in its hiring process for Blockchain Engineers?
- Yes, 1inch may use AI tools to assist in reviewing applications and analyzing resumes. However, these tools supplement human judgment, and final hiring decisions are made by humans.