React Frontend Developer (Mid-level)

Xelix; City Of London; Hybrid; GBP 60,000 - 75,000; Full time

Job summary

A leading financial automation company in London is seeking an experienced React Developer to join their team. The role involves building user interfaces, collaborating with designers, and ensuring high-quality code. This position offers a competitive salary of £60,000 to £75,000, 27 days of annual leave, and a hybrid work model with a supportive environment for professional development. If you're passionate about automating financial processes, we would love to hear from you.

Benefits

27 days of annual leave

Hybrid working

Private medical & dental cover

Annual learning budget

Team socials & activities

Annual team retreat

Qualifications

• Minimum 3 years experience in Front End development.
• Strong knowledge of modern syntax JavaScript and TypeScript.
• Familiarity with modern application architecture and design patterns.

Responsibilities

• Collaborating with designers and other developers to build websites from specifications.
• Creating visually appealing experiences using frontend applications.
• Performing testing and quality assurance activities on different browsers.

Skills

JavaScript

TypeScript

Redux

Zustand

React

Problem-solving

Testing

Tools

Playwright

Vitest

React Testing Library

Job description

Overview

About us

At Xelix, we work with some of the world’s largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows.

Xelix is a fast-paced scale-up - things move fast and expectations are high. We raised our Series B with Insight Partners in June 2025 and are expanding aggressively, whilst remaining profitable. We have over 100 talented people pulling together to achieve our goals. Everyone is trusted to take ownership, move fast and have a meaningful impact. We prioritise personal and professional growth, keep things fun & we love to celebrate a milestone together.

In this role you’ll grow, be challenged and help shape the future of Xelix. If you’re excited about building something special with us, we’d love to hear from you.

About the role

We’re looking for an experienced and motivated React Developer to join our growing development team. In this role, you will implement user interface components using React concepts and technologies, including Zustand and Tanstack Query. You will also ensure that these components and the overall application are robust and easy to maintain.

Our developers take pride in their work – producing clean, tested, beautiful code. Rather than give you a detailed set of requirements, we encourage engineers to take responsibility for solving the problem. There are many opportunities to innovate as you collaborate with stakeholders to design and implement new features.

You will be well supported to continue your professional development. This includes an annual conference allowance, a generous learning budget, and a monthly session with your manager to identify and track your development goals.

What you'll be doing

• Collaborating with designers and other developers to build websites from specifications produced in Figma.
• Creating visually appealing experiences using frontend applications.
• Aiding in the design of, and consuming REST APIs and web-socket solutions to efficiently deliver application components.
• Performing testing and quality assurance activities on different browsers and devices to ensure compatibility and responsiveness.
• Mentoring other team members, sharing knowledge and experience, and helping improve our team's abilities in the process.
• Ensuring the quality of code by writing comprehensive tests and participating in code reviews.

What you’ll bring

• Strong knowledge of modern syntax JavaScript and TypeScript.
• Experience with state management tools, such as: Redux, Jotai or Zustand.
• Experience with ‘stale whilst re-validate’ technologies React/Tanstack query, RTK Query, SWR.
• Minimum 3 years experience in Front End development.
• Familiarity with modern application architecture and design patterns.
• Understanding of the complete software development life cycle.
• Strong Computer Science fundamentals and problem-solving skills.
• Ability to effectively communicate complex technical concepts to team members and stakeholders.
• Passionate about testing, rapid iteration and collaborative problem solving. (e2e, unit tests, integration tests)
• Knowledge of modern frontend testing tools (Playwright, Vitest, React Testing Library)

Bonus Points

• An interest and aptitude in data visualization, transforming complex datasets into intuitive visual representations.
• Skills in User Experience (UX) and User Interface (UI) design, demonstrating a keen eye for aesthetics and attention to user journeys.
• Experience working within a monorepo
• Experience with just-in-time css compilation tools. (eg pandaCSS)

What we offer in return

Competitive salary of £60,000 to £75,000 depending on experience

27 days of annual leave (including 3 days Christmas closing), with the option to roll over 3 days

Hybrid working with one day a week from our dog-friendly Hoxton office and on-site gym

Comprehensive private medical & dental cover with Vitality

Enhanced parental leave pay

Learning & development culture – £500 personal annual budget

We’re carbon-neutral and are working towards ambitious carbon reduction goals

Lots of team socials & activities

Annual team retreat

Want to learn more?

• About us
• Xelix blog
• Xelix news
• Xelix glassdoor

We believe that people from diverse backgrounds, with different identities and experiences make our company and product better. No matter your background, we'd love to hear from you! And if you have a disability, please let us know if there's any way we can make the interview process better for you - we're happy to accommodate!

If you're a recruiting agency - we have an existing list of agencies we work with if required and we are not currently planning on expanding the list. Neither the Talent team nor hiring managers or the Support team will respond to cold outreach.

This is a full-time position, with standard working hours from 9:00 AM to 6:00 PM, Monday through Friday.

Interview Process

While the exact process may vary slightly depending on the role, our typical interview stages are:

1. Introductory Call – A short Teams conversation with a Talent Partner to discuss your background and the opportunity.
2. Hiring Manager Interview – A 30–45 minute Teams meeting to explore your experience and fit for the team.
3. Technical Task or Presentation – A role-relevant exercise to demonstrate your skills and approach.
4. Final On-site Interview – An in-person meeting with our senior leadership team and co-founders at our office.

We strive to make the process clear, efficient, and respectful of your time.