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Senior TypeScript Engineer - Web3js (CET/EST)

ChainSafe Systems

ChainSafe Systems

Posted on Friday, June 21, 2024

Building the infrastructure for Web3

ChainSafe is a multi-chain research and development firm specializing in protocol engineering, security audits, cross-chain interoperability and web3 gaming.

Our mission is to advance blockchain technology through open-source innovation, making it more accessible, secure, and sustainable. Since our inception in 2017, our work has consistently pushed the boundaries of what's possible in the blockchain space.

ChainSafe has worked to maintain stable alternative implementations, improve functionality and, in turn, adoption of some of the top protocols in the space, such as Ethereum, Filecoin, and Polkadot - helping to create and secure over 230 Billion USD in combined value measured by market capitalization of these protocols.

To learn more about ChainSafe, look at our GitHub and website.

Here’s what you might want to know before reading on:

  • We are at the forefront of blockchain innovation, for instance when we spun up Goerli network in 2018, or spearheaded the migration of Ethereum to Proof of Work (yes that was us :) )
  • We are public goods champions, all our work is open-source and widely recognized by the Web3 research community
  • We serve more than 10 blockchain ecosystems and Chainsafe Software secures more than $1Bn of transaction volume
  • We spearhead ecosystem projects like Web3.js, Lodestar, Forest, and Gossamer
  • We are global, remote-friendly, and open to contractors

At ChainSafe, you’ll be part of a 120 person team distributed across 35+ countries that believes in the community’s vital importance and contributes to advancing humanity with open-source and decentralized technology. Joining us is a unique opportunity for a computer scientist to be working with the only company in the world shipping cutting edge open-source innovation across multiple domain of the blockchain industry. We develop 3 protocol clients (Filecoin Ethereum, Gossamer), a gaming SDK for unity, a multi-chain bridge, run thousands of nodes for Lido Finance, work with the most innovative and best funded Web3 start up in the world.

Who we need

Web3js.org was created by one of the co-founders of Ethereum. We are looking for a passionate and proactive Senior TypeScript Developer who shares our commitment to building out open-source software and pushing blockchain into mainstream adoption. You will collaborate across multiple Ethereum-focused projects and contribute to your team's success through consistent, high-quality code. On your day to day, you will be the core maintainer of the oldest Web3 library, with more than 2M downloads per month: Web3js.org. Your work will impact millions of people that are building on Ethereum.


  • Actively participate in discussions with project manager, tests, and software engineers to suggest new or improve Web3js
  • Review, audit and test your teammates’ code, correct bugs reported by the community. https://github.com/web3/web3.js/issues
  • Provide feedback on overall design decisions
  • Understand a protocol specification and develop compliant and optimized code
  • Actively follow latest EIPs

Required skills and experience

  • You’ve been part of tech companies and ship software through a complete software development lifecycle
  • 5+ years of TypeScript programming language, paradigms, constructs, and idioms
  • Excellent debugging skills, you can demonstrate how to run a good code review
  • Experience in working and contributing to open source projects
  • Knowledge of best practices, patterns, and understanding of key principles of developing software

Nice to have

  • Experience with distributed systems, peer-to-peer systems, network programming, or cryptography
  • Experience maintaining a large mono repo codebase with many components and keeping it well-designed, future-proofed, and modular
  • Can construct and maintain CI/CD pipelines
  • Experience with testing frameworks (Jest, cypress )
  • Experience with different web bundlers (webpack, esbuild, browserify)
  • Experience with Ethereum/EVM-compatible blockchain
  • Knowledge and application of semver versioning

Tell us who you are

If you feel like you’re the perfect fit for the role, please apply, even if you don’t match all the requirements. We believe results talks more, don’t be shy to share the projects you worked on and send us the commit you’re the most proud of.

Hiring Steps

  • Qualified candidates will be invited to a 30-45 mins screening call with one of our tech recruiters
  • Next, candidates will be invited to do Technical assignment to evaluate how you debug
  • Interview with Web3js project manager
  • Final Technical Interview

Why Join ChainSafe

Founded by developers for developers, ChainSafe is a remote-first company with an international team. We continue to provide opportunities for personal and professional growth, value autonomy and responsibility, have a results-driven environment, and offer flexible work hours.

We care deeply about our values and look for these attributes in every new team member. In addition, we recognize the benefits of cultivating a diverse team and aspire to embed respect for all people into our culture. We encourage women, the LGBTQIA+ community, people of color, and members of any other group underrepresented in the tech space to apply.

How to Apply

Please fill out the Greenhouse application form below and ensure that you attach your resume and link your Github/Gitlab profile or any software projects you have contributed to (if applicable).