Senior QA Engineer - Zaps

A quick run-down of the job

We are looking for a crypto-native Quality Assurance Engineer to take full ownership of testing and validating our Zaps product—our B2B new product suite that allows developers to interact with any smart contract on chain. You’ll manage, track, and resolve known bugs, collaborating closely with our existing QA team and the development team to address quality concerns before they reach our users. Your attention to detail and proactive problem-solving will be vital to the continued success of our platform.

Please note: This role requires you to be located in EMEA. Your application will not be considered otherwise.

What you’ll do

• Review and interpret DeFi protocol documentation and Solidity contracts to understand expected on-chain behavior

• Validate the correctness of Zap VM executions by ensuring that both the inputs and outputs match the expected behavior of the underlying DeFi protocol’s smart contracts

• Design and implement robust testing strategies for backend services, REST APIs, and protocol integrations

• Collaborate with the QA team to uphold and evolve our testing standards across plugin development and compiler workflows

• Ensure newly added features and protocol integrations meet strict quality and correctness criteria

• Track, manage, and drive resolution for bugs—especially those related to protocol behavior, integration logic, and output discrepancies

• Identify UX or product issues, communicate them clearly, and propose improvements

• Work closely with the development team to ensure high-quality releases and consistent QA processes

• Maintain clear and comprehensive test documentation, plans, and reports

Our tech stack:

• TypeScript – for protocol integration plugins

• Rust – powering the compiler service that converts TypeScript into instructions

• Solidity – smart contracts deployed across EVM networks

• DragonflyDB / Redis – caching and state layer

What makes you a good candidate

• 5+ years in QA, ideally focused on backend, API, or integration testing

• Deep crypto-native understanding, including: Ability to read DeFi protocol docs Comfort interpreting Solidity contracts Familiarity with on-chain transaction flows and protocol mechanics

• Ability to read DeFi protocol docs

• Comfort interpreting Solidity contracts

• Familiarity with on-chain transaction flows and protocol mechanics

• Experience with Git, GitHub (Actions), TypeScript, Playwright, and Postman

• Strong communication skills and the ability to work cross-functionally

• Self-driven, detail-oriented, and able to work independently or collaboratively

• Ability to understand development changes quickly and ensure compatibility across features

• Bonus: experience with JIRA and QA automation tooling

• A passion for DeFi and eagerness to continuously grow technically

We encourage you to apply if you feel your experience and skills equip you for this job but are not listed here!

Company culture

• Embracing the differences Embrace your own differences Respect and welcome the unique qualities of others See others’ differences as an opportunity to grow

• Embrace your own differences

• Respect and welcome the unique qualities of others

• See others’ differences as an opportunity to grow

• Own it, do it Own tasks end-to-end Hold yourself to a high bar for execution Make bold decisions, and be accountable Understand your limitations and seek for help

• Own tasks end-to-end

• Hold yourself to a high bar for execution

• Make bold decisions, and be accountable

• Understand your limitations and seek for help

• Fail forward Try - don’t be afraid to fail Learn - don’t make the same mistake twice Adapt - grow with the experience

• Try - don’t be afraid to fail

• Learn - don’t make the same mistake twice

• Adapt - grow with the experience

• Have fun together Take the time to get to know and understand each other better Don’t take yourself too seriously and keep it light-hearted Fun should be coming from a place of love and respect

• Take the time to get to know and understand each other better

• Don’t take yourself too seriously and keep it light-hearted

• Fun should be coming from a place of love and respect

What you’ll get

• Annual team offsites (Thailand in 2023 and Vietnam in 2024 were a blast, Marrakech in March 2025 was blast-ier; let’s see what happens in 2026!)

• 30 days of PTO

• Flexible remote days

• Flexible working hours

• Equity participation from day 1

• Entitlement to work computer (choice of equipment)

• An annual 1,000€ personal development budget once you have worked 6+ months (pro-rated the first year)

• A one-time 1,000€ remote budget to use on coworking, office setup, etc.

If you join us as an independent contractor, you’re only entitled to the first five benefits of this list.

Application process

Setting yourself up for success starts with the application! Click here to discover valuable tips that will help you navigate our application process effectively.

LI.FI is an equal opportunity employer. We encourage individuals of all backgrounds to apply. Join us in our dedication to fostering a workplace that values and respects each team member's unique contributions.

Shortlisted candidates will undergo a comprehensive interview process, including a people operations interview, a take-home assignment, a meet-the-team & founder interview, and a reference check.

For more information, visit our page detailing our hiring process!