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Typescript Library Engineer in Barcelona


Est. Salary
35,000 - €45,000
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Job Description


We’re a blockchain startup, but we are helmed by early adopters and industry veterans that are building a very groundbreaking product suite that provides the user experience improvements needed to make blockchain technology truly mass adoptable. For example, we have a working prototype of a cryptocurrency wallet which provides interoperability between chains and human friendly addresses to make crypto transfers as easy as sending and receiving email, even between different types of tokens such as Bitcoin and Ethereum. Our demo of this prototype won Runner Up in the Startup Battlefield Europe competition hosted by TechCrunch in May, and more recently in August we’ve already put out a public code release of our IOV-core client.

Our development strides can be attributed to our efforts at recruiting top talent into blockchain coding, and it helps that our team is also expertly guided by talented veterans such as the original system architect and first technical employee of Lisk (which in its time was the most successful ICO in 2016 and second most successful ICO in history after Ethereum, before going on to reach a multi-billion dollar market cap in Q1 2017 as a top 20 project in the industry).

IOV was founded because we believe in the potential of blockchain tech to improve life for not only business operators, but everyone - in every industry, and every economy. We believe that potential won’t be realized, however, without solving the cross-chain transaction and user friendliness barriers that we’re building IOV’s products to solve. Our suite’s key components include the Blockchain Communication Protocol, the Blockchain Name Service, an SDK for developers, and the “universal wallet” we’re building for mainstream consumer usage. You can find more details on our website:


We're seeking a smart, self-motivated person to join our team enhancing, our client-side sdk supporting secure key management and interaction with multiple blockchains.

You will work closely with the team lead to design and extend the functionality of the library. We place high emphasis on correctness, testing, and clean code, and it can be a great opportunity to level up your Typescript skills, as well as cryptography and blockchain knowledge. The feature set is driven both by the feature set of our front-end applications (product), as well as a desire to create an intuitive yet powerful sdk for other developers to build upon.

Key Responsibilities:

  • Reviewing and auditing code

  • Building flexible connectors to various blockchains

  • Implementing or porting codecs and key signing algorithms

  • Assisting in the design of APIs

  • Developing tooling on top of the library for various use cases


You like to learn new things and are excited about the potential of blockchain. You want to get your hands dirty digging in under the APIs and create new libraries, rather than just build dApps on top of web3 and solidity. You like to create tools that others will use and develop your reputation in the open source community by assisting other developers. You feel profound satisfaction when you ship code with no serious bugs. And most of all, you want to learn and work in a team, pushing you to improve your craft.

Key Qualifications:

  • Experience with modern Javascript, understanding of ES6 and best practices

  • Experience with a static typed language required (C++/Java/Swift/etc)

  • Previous Typescript experience preferred

  • Experience deploying code to production, and understanding of what “production quality” means

  • Experience with git and version control

  • Writes unit tests and understands the difference between “works for me” and “works”

  • Quick learner, open minded, smart person

** IOV is an equal opportunity employer, supporting inclusiveness in all aspects of life, including Religion, Sex, Gender Identity, Sexuality, Age, Disability, Ethnicity and Race. **

Contractors must live in Europe with valid working visa. We embrace remote work, but maintaining the same time zone and ability to meet up face to face on a regular basis are essential for building a solid team at this early stage. (In the future, we hope to be able to integrate developers from more regions).


About IOV

  • Blockchain

  • Paris, France

  • 2-10

  • 2017


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