Senior Web3 Full-Stack Engineer

Jumper is crypto’s everything-exchange powered by LI.FI. By building on the sophisticated cross-chain infrastructure of LI.FI, we offer a comprehensive multi-chain experience for any and every person in crypto to move and use their funds across chains as easily and flexibly as they desire.

Our vision? We want to make multi-chain DeFi easy and fun!

While we live under LI.FI’s umbrella, we pride ourselves in our small but excellent and very agile team. Jumper already has over 150k active users, and still we are only now getting started to build it from the ground up - as an independent spin-off. As a Full-Stack Engineer, you would be at the core of this new adventure - completely owning the realization of Jumper’s underlying infrastructure and bringing new ideas to life!

A quick run-down of the job

We are looking for a Web3 Senior Full-Stack Engineer who will co-lead the design, development, and maintenance of the Jumper apps. In this role, you are expected to split your work between frontend and backend, with an emphasis on backend. We are a small team, and every one of our engineers is expected to strongly contribute to Jumper’s success by coming up with independent ideas and solutions to complex challenges.

Our current stack:

• Node.js running TypeScript code in Docker containers

• NextJS

• Jest

• PostgreSQL and Redis

• Github, Kubernetes, GCP and CloudFlare for our GitOps CD chain

• Viem and Wagmi is a nice to have

• React Native is a plus

Please note: You must be located in the EMEA region. Your application will not be considered if you're outside EMEA.

What you’ll do

• Architecting and implementing scalable and robust infrastructure solutions that can handle growing user loads and evolving business needs (we are already used by over 150k monthly active users).

• Developing and maintaining comprehensive test suites, including unit tests, integration tests, and end-to-end tests

• Design and develop high quality frontend applications that are testable and maintainable

• Be responsible for development of prototypes, new frontend features and React components

• Leading the design, development, and maintenance of a newly developed Jumper backend system and APIs

• Collaborate closely with the Software Engineers, Product Manager and Designers within your team

What makes a good candidate

• Must be located in the EMEA region

• 5+ years of working experience, including 1/2 years focusing on backend work

• Effective communication skills (in English) with the ability to build relationships and work in a small but excellent team while self-guided on a day-to-day basis

• Experience in software design and architecture

• Knowledge of testing frameworks and principles

• Previous working experience in the crypto space or related technical understanding

• Passion for new technologies and ability to autonomously evaluate them and make suggestions for improvement

• Previous working experience in consumer applications is a plus

• Bachelor's or Master's degree in Computer Science is a plus

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

• 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

• Fail forward

  • 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

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!