Senior Frontend Engineer

Hey, we’re Sparta Commodities!

We are a Swiss, VC-backed scaleup with a global reach. Our mission is to digitize the commodity trading market and become the leading platform for traders in all commodities verticals. We’ve already gained significant market traction and are financially backed by Venture Investors.

We have a fantastic opportunity available for a driven and passionate Senior Frontend Engineer to join our growing Engineering team, based remotely in Spain. This is a great career opportunity for an experienced and delivery-focused Engineer to play a key role in the development and maintenance of various front-end systems, including an Excel plug in, for a leading and highly regarded business.

We are looking for someone who has had ownership of projects from inception until after release, and who is familiar with observability, product metrics, and maintainability. They will be involved in the design of technical solutions as owner and implementor, on top of reviewing designs from other team members.

On your day-to-day, you will work within the team reviewing code, and promoting initiatives to improve our code quality, maintainability, and development experience. As part of the development sprints, you will release new features and products using quality practices such as automated testing, QA validation, and monitorization.

Requirements

• At least 6+ years of experience in a Frontend role
• Ownership and accountability for projects and their product metrics
• Extensive experience with React
• A body of work in design systems
• Experience with Jest, Mocha, or other common testing libs
• High communication skills in a remote-first company with a diverse workforce
• Must be based in Spain or the UK, this is a remote role with occasional travel to a central Madrid/London hub for collaborative meetings and team gatherings.
• Fluency in Spanish & English.

Bonus Points

• NextJS or similar
• Knowledge of server-side rendering techniques and architectures
• Experience with cypress for e2e tests
• Prior work on real-time systems such as WebSockets, stock tickers, or videogames
• Experience and prior work with Redux
• Previous involvement in trading or fintech sectors.
• Experience contributing to a startup's growth stage.

What’s the culture like at Sparta?

At Sparta, our culture is not just a set of values written on a wall—it's a way of life. We embrace a dynamic environment where initiative is celebrated, challenges are met head-on, and innovation thrives.

We're building an environment where our employees thrive and excel in their work. Our aim is for every member of our team to take pride in their contributions. You'll collaborate with like-minded individuals who are passionate about our mission and deeply committed to crafting outstanding products and achieving success for our customers.

We operate remotely, understanding that a thriving, profitable company isn't just about being in the same location. We build our relationships through effective remote work methods and carefully planned in-person meet-ups.

What we offer

• Remote working, with occasional travel to a central Madrid hub for collaborative meetings and team gatherings.
• Attractive company stock option plan.
• Yearly companywide meetups in sunny locations.
• Training and education budget.
• Private Medical Insurance.
• Access to the optimal gear suited for your position.

Sparta Commodities is proud to be an equal opportunity employer and promotes diversity within its workforce. As an international business, we are determined that suitably qualified persons will never receive less favourable treatment on the grounds of gender, age, disability, religion, belief, sexual orientation, marital status, race, veteran status or any other basis covered by appropriate law.