# Work with API3

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Consider joining the distributed, highly collaborative Core Development Team at API3. We are constantly searching for talented individuals who think blockchain technology is the big thing and want to build a future where off-chain, real-world data seamlessly interfaces with smart contracts and decentralized applications.

# We are Builders

The Core Development Team is focused on delivering optimized solutions to securely, efficiently, and transparently access off-chain data. We are pioneers in first-party oracle technology that underlies a growing ecosystem of institutions participating in the Web3 API economy. In addition to working in public and releasing open source software, the Core Development Team embraces automation, experimentation, multi-hat roles, high standards, and supporting one another.

# Openings

Here are some great roles we need help with. Then again, maybe you can define one for us. Contact Us →

  1. Senior Quality Assurance/Quality Control Engineer
  2. Blockchain Technical Project Manager
  3. Full Stack Developer
  4. Elixir Backend Developer
  5. Senior Blockchain Engineer

# Senior Quality Assurance/Quality Control Engineer Job Description


  • Hands-on manual investigation and reproduction of functional backend software issues.
  • Root cause analysis of existing test script failures.
  • Identification of current test script deficiencies and candidates for additional scripted coverage.
  • Investigatory testing of unreleased features including defining requirements, behavior and impact.
  • Documentation and design of candidate test scenarios for the above.


  • 5 years+ of backend QA engineering experience, frontend manual/auto testing experience is a great bonus.
  • 1 year+ of Smart contract security auditing/testing.
  • Full cycle testing from designing manual tests, developing scripts and execution.
  • Strong experience with Blockchain Ethereum technologies.
  • Scripting ability using NodeJs, bash, Python.
  • Experience testing backend services such as APIs, Databases, distributed services (non-monolithic), solidity smart contract.
  • Enjoys breaking things and solving problems - not just able to find out the 'what', but also the 'why'.
  • Very good English and good communication skills.
Contact Us →

# Blockchain Technical Project Manager Job Description

Key Job Responsibilities:

  • Have a strong track record of shaping business strategy for technical products or services.
  • A strong understanding of the API connectivity problem is desirable.
  • Understand how to design scalable software.
  • Be conversant with emerging technologies.
  • Communicate effectively with both business and technical partners.
  • Have an entrepreneurial spirit.

Basic Qualifications:

  • 5+ years of experience managing complex technology projects.
  • Experience with agile development methodologies (i.e. Scrum, XP, Kanban, etc).
  • Experience with project delivery for large, cross-functional projects.
  • Experience and proficiency with web technologies and tools.
  • Track record of authoring forward looking technology roadmap/ yearly planning docs to enable trade-off and decision at leadership level.
  • Strong analytical and problem solving skills.

Preferred Qualifications:

  • Master's degree in a business or technology discipline or related field.
  • Superior project management and organizational skills.
  • Strong customer focus and ability to demonstrate pragmatic decision-making.
  • Exceptional verbal and written communication skills.
  • Experience delivering large-scale systems with world-class availability, scalability, and performance requirements.
  • Experience in non-technical aspects including idea generation, business analysis, financial understanding, and process optimization.
Contact Us →

# Full Stack Developer Job Description

Required Skills:

  • 5 years of experience delivering enterprise class JavaScript web applications.
  • 3 years of experience building single page applications with React or similar.
  • Experience with Typescript ES6/ES7 JavaScript.
  • Solid fundamental understanding of unit, integration, and e2e testing.
  • Practical experience building and consuming RESTful APIs in node.js.
  • Solid understanding of the full web technology stack (e.g. HTTP, cookies, asset loading, caching, REST).
  • Experience using CI/CD tools and systems such as Jenkins, GitHub, GitLab, Bitbucket, etc.
  • Experience with HTML, CSS, Sass, Bootstrap or similar.
  • Solid understanding of object-oriented design and functional programming concepts, core JavaScript concepts like scope/closures, the event loop, asynchronous callbacks and promises.
  • Have a passion for quality and writing clean, solid, readable code that scales and performs well.
  • Strong desire to learn, communicate, and share knowledge with others.
  • Strong critical thinking and problem solving skills.
  • Experience architecting and implementing complex solutions from infrastructure to application level.

Preferred Qualifications:

  • Experience with cloud infrastructure (AWS, Azure, or similar) and/or containerization (Docker, Kubernetes).
  • Experience with SQL, RMDBS, and NoSQL.
  • UI/UX Design experience is a plus.
  • Experience working in an Agile environment.
  • Experience with Unix/Linux.


Seeking eight (8) years of overall experience performing web development activities with a Bachelor’s Degree.

Contact Us →

# Elixir Backend Developer Job Description

Required Skills:

  • 7+ years of experience is a professional development environment.
  • 4+ years of experience with Functional programming (Ideally Elixir).
  • 1+ years of experience working with AWS or other cloud environments (GCP, Azure).
  • The ability to improve everyday and take ownership of your work.
  • The ability to collaborate with team members and be coachable.

Preferred Qualifications:

  • 7+ years working as a full stack engineer.
  • Passionate about Elixir and filling in any gaps of knowledge of the cutting edge language.
  • Experience with React/NextJs Framework.
  • Passionate about growing on a daily basis.
  • Disciplined approach to testing and quality assurance.
Contact Us →

# Senior Blockchain Engineer Job Description

Required Skills:

  • 2+ years of smart contract development experience in Solidity (experience in other smart contract languages is an asset).
  • Strong knowledge of design principles both specific to smart contract (like factory pattern, proxy design) or more generic like OOP, functional programming, REST.
  • Experience in Solidity, Typescript, OpenZeppelin standards, Web3, Truffle/Hardhat, the Graph, NodeJS, AWS, MySQL/Postgres, MongoDB/NoSQL.
  • Experience in smart contract auditing is a strong asset.
  • Familiar with cryptography and encryption methods. Experience with enterprise level key management solutions or projects is a strong asset.
  • Ability to grow yourself and other engineers through code reviews, design reviews, and screenshare/peer debugging.
Contact Us →
Last Updated: 2/24/2022, 2:50:42 PM