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Senior Web3 Software Engineer, DeFi Wallet



Software Engineering
Paris, France
Posted on Saturday, May 18, 2024

Blockchain.com is the world's leading software platform for digital assets. Offering the largest production blockchain platform in the world, we share the passion to code, create, and ultimately build an open, accessible and fair financial future, one piece of software at a time.

We are looking for Kotlin and Solidity Developers with experience on blockchain protocols and EVM networks. As a backend engineer on the DeFi team, you will be working on a wide array of projects, from scaling our non-custodial wallet’s network support to writing smart contracts. Additionally, you will be responsible for integrating with 3rd party vendors that provide data for crypto tokens, DApps and DAOs, as well as efforts to further centralize logic that currently exists on our wallet clients, into backend services.

As a Senior Back-End Engineer you should lead by example - driving the technical discussions, influencing the approach and making a positive impact on the team's development by advocating the best engineering practices.


  • Build solid, reliable software to handle multiple networks and support our ever growing family of products and user base
  • Be a part of a dedicated engineering team committed to applying the highest standards and shipping secure and performant systems
  • Work in the core of Blockchain.com’s solution, interacting directly with multiple blockchains
  • Work extensively with open source technologies (Docker, Kafka, MySQL)
  • Ensure security is at the forefront of everything you do
  • Work within interdisciplinary teams to continually deliver the highest quality products to our users
  • Optimize existing systems for scalability, extensibility and performance whilst building out reusable, modular code for use across Blockchain.com's products


  • The foremost quality for this position or any position at Blockchain.com is integrity
  • Solid experience in Typescript, Solidity and ideally Kotlin/JVM
  • Experience working with Blockchain technologies (EVM or non-EVM chains, and defi protocols)
  • You are highly motivated, self-driven, and passionate about cryptocurrencies
  • You know how blockchain systems work, and preferably, you worked closely with at least one
  • You find your way around a novel problem you haven't faced before
  • You possess an innate curiosity, you know multiple programming languages, you are a strong advocate for the best engineering practices and thrive on learning new technologies
  • You take a pragmatic approach to developing clean solutions to complex problems
  • You pride yourself on consistent high levels of test coverage, strong technical documentation and effective monitoring
  • You take full responsibility for all the projects you work on


  • Competitive full-time salary based on experience and meaningful equity in an industry-leading company
  • Awesome office location in the heart of Paris - working 4 days in the office is mandatory
  • Work from Anywhere policy
  • The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an exciting, emerging industry
  • Unlimited vacation policy; work hard and take time when you need it
  • Performance-based bonuses paid in cash
  • Apple equipment provided by the company