Full Stack Developer jobs in United Kingdom

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IOHK

United Kingdom

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9b213fadc6bb

21

12.08.2025

26.09.2025

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Who are we?

IOG, is a technology company focused on blockchain research and development. We are renowned for our scientific approach to blockchain development, emphasizing peer-reviewed research and formal methods to ensure security, scalability, and sustainability.

Our projects include the Cardano blockchain, as well as other products in the areas of decentralized finance (DeFi), governance, and identity management, aiming to advance the capabilities and adoption of blockchain and Web3 technology globally.

What the role involves:

As a Software Engineer at IOG you are responsible for writing high-quality code for our products. You have the exciting challenge of working with cutting-edge research and technology. Join the team behind the development of the Cardano blockchain. Our team specifically is responsible for advancing Cardano's ledger, maintaining its security, scalability, and overall architecture.

• Write high-quality code, working with cutting-edge research and technology to implement features like protocol rules and transaction validation
• Work with teams across multiple time zones in Europe and America.
• Be proactive, work independently and require minimal supervision or mentoring to complete tasks
• Collaborate with other teams on integration issues and problems that span a greater context
• Review specifications produced by formal methods specialists
• Commit often and submit small pull requests frequently
• Cover your code with unit, property and integration tests
• Review the pull requests of your team mates
• Fix bugs in your own code and in legacy code from others
• Be available for emergency fixing of severity 1 issues on deployed products
• Integrate software components and third-party libraries
• Write clear documentation with sensible examples
• Communicate with others professionally, effectively and efficiently.

Requirements

Who you are:

• Degree in Computer Science is desirable but not essential
• A minimum of 5 years development experience (professional or otherwise) in Haskell.
• Strong experience at writing code in the declarative programming paradigm.
• Experience working with Git and Github
• Experience with nix is preferred, but not required.
• Proficiency with advanced FP techniques such as:
• Type families, Higher Kinded Data, Dependent types, Generic programming, Type-level programming, Free monads
• Good understanding of evaluation strategies and related concepts: call-by-need, lazy evaluation, memoization, weak-head normal form vs normal form. Capable of identifying and avoiding space leaks.
• Experience with serialization techniques in Haskell using any of the common libraries: cborg, serialise, store, flat, binary, etc.
• Advanced level understanding of pure functional data structures and Haskell libraries that provide such functionality: containers, vector, bytestring, etc.
• Comfortable using other common Haskell libraries such as: crypton, random, transformers, mtl, lens, conduit, persistent, aeson, etc.
• Skilled at writing QuickCheck/Hedgehog generators and property tests.
• Familiarity with common testing frameworks like HSpec or Tasty.
• Capable of analyzing performance using common tooling like profiling and writing benchmarks
• Experience with low level programming, such as dealing with foreign function interfaces and using primitive operations in Haskell is a plus, but not required.
• Write idiomatic Haskell code that satisfies the acceptance criteria of a given task
• Write tests (unit tests, property tests) that provide sufficient and non-superfluous efficient code coverage.
• Document code and APIs concisely and unambiguously
• Break down tasks into subtasks that are completable in a short amount of time and report completion as required by managers
• Pragmatically adhere to software engineering principles (modularity, incremental development, no premature optimization, no feature creep, no speculative generality, no code duplication ...)
• New starter package to buy hardware essentials (headphones, monitor, etc)
• Competitive PTO

At IOG, we value diversity and always treat all employees and job applicants based on merit, qualifications, competence, and talent. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.