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Senior Full Stack Engineer (React & Java)

Remote from Spain·Added 4 days ago (last checked 23 Oct)

Treatwell

6 open roles

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Our summary

Work mode: Remote from Spain
English: Required
Experience: 7+ years

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Skills

Requirements

What we're looking for

7+ years of software development experience, with a strong focus on modern web frontend and hands-on experience building backend services.
You take responsibility for the code you write and the areas you own, spotting bugs, performance issues, or UX gaps, and fixing them proactively without waiting for direction.
You own features end-to-end, from database schema to UI, without needing a handoff.
You have a product mindset. You think about the person using what you build, ask why before how, and push back when something doesn't make sense.
You think in systems and trade-offs, and you look for the upstream cause, not just the downstream symptom.
You are data-driven. You instrument your work, measure impact, and use evidence to make decisions.
You actively leverage AI tools in your daily development workflow, viewing them as force multipliers for productivity, code quality, and problem-solving.
You are comfortable with ambiguity in complex domains and can make progress without getting paralysed.
You have sharp product thinking and a focus on UX, paying attention to the little things: edge cases, empty states, and error handling.
You have excellent English communication skills and can explain complex technical ideas clearly to engineers, designers, and non-technical stakeholders.
You are comfortable working with remote and co-located teams, and you are structured, analytical, and highly collaborative.

Pay & benefits

What you'll get

28-days holiday, plus bank holidays
Monthly £/€40 Treatwell vouchers so you can treat yourself too
Mental health support through our partnership with Open-Up
100% remote position
Market-specific benefits that will be discussed in the interview process

The role

Senior Full Stack Engineer (React & Java)
We build and operate Connect, a SaaS platform for the beauty & wellness industry that helps entrepreneurs run their businesses more effectively, built by Treatwell. Our web products are used daily by tens of thousands of people across 13 European countries.
Our teams own their areas from initial idea and design through deployment and operations. We focus on writing maintainable, scalable code while balancing legacy and modern technologies. We encourage engineers to experiment with new ideas, learn from mistakes, and improve our systems continuously.

What you'll do

Take ownership of features across the stack, from database schema and backend services to the UI, from design through deployment and operations.
Pair with engineers, designers, and PMs to ship features every cycle, iterating based on real usage and feedback.
Participate in design and code discussions, making trade-offs and decisions that affect the product and the team.
Maintain a strong focus on automated testing, applying the testing pyramid to ensure unit, integration, and end-to-end coverage.
Improve observability across services and the frontend by adding metrics, dashboards, and alerts with tools like Datadog, Sentry, and web vitals, so issues are caught before they impact users.
Design and build backend services and APIs in Java and Spring Boot, including event-driven flows with RabbitMQ.
Own your services end-to-end, with a DevOps mindset, from architecture through deployment and operations.
Validate ideas with data: instrument your work, measure its impact, and use evidence to decide what to scale.
Be an active part of the Engineering Guild, collaborating with other engineers to share ideas, improve standards, and tackle cross-team challenges.
Lead technical discussions about trade-offs in features, architecture, and UX, helping the team make informed decisions that balance product goals and engineering constraints.
Navigate a hybrid codebase, balancing work between legacy systems and modern React/TypeScript.
Build internal tools that help operations and support teams move fast without creating risk

Our stack

Frontend: The application originally grew as a Backbone-based product, served through Node/Express with EJS templates, and there are still important areas of the product that work this way today. The team is migrating the frontend toward React and TypeScript, page by page and feature by feature. In practice, that means most new development now happens in the modern React/TypeScript stack, using tools and patterns such as React Query, Storybook, Jest, and Cypress, while some work still involves the legacy Backbone codebase and the integration layer between old and new parts of the app.

Backend: Java, Spring Boot, RabbitMQ, PostgreSQL, MS-SQL

Infrastructure: Kubernetes, GitLab CI/CD, AWS, Datadog

Mindset: DevOps, DDD, event-driven architecture

About Treatwell

Treatwell is Europe's leading online marketplace for beauty and wellness services, connecting millions of customers with salons and spas across multiple countries. Founded in London, the company operates a two-sided platform that enables booking, payments, and management tools for beauty professionals, with a strong focus on technology and product innovation.

In Spain, Treatwell has a significant presence, with offices in Madrid and Barcelona, and is actively hiring for engineering and commercial roles. The company offers a dynamic, international work environment with a strong emphasis on growth, making it an attractive option for tech professionals looking to relocate to Spain. Treatwell supports flexible working and provides opportunities for career development in a fast-paced, multicultural setting.

Founded: 2012
Employees: 500–1,000
Headquarters: London, UK
In Spain: Barcelona, Madrid
Website: treatwell.com

Good to know if you are moving

Treatwell has offices in Barcelona and Madrid, offering opportunities in a vibrant Spanish tech hub.
The company is part of the international group, providing a multicultural work environment with English as a common language.
Treatwell offers internships and junior roles, making it accessible for early-career international professionals.
The company's platform serves millions of users across Europe, providing exposure to a large-scale marketplace.
Treatwell supports remote work and flexible arrangements, which can ease the relocation process.

In their own words

Additional information

Treatwell is an 'Open to All' employer and warmly welcomes everybody to the team. We are committed to making reasonable adjustments to the recruitment process as required. Please add any adjustment requests to your application.

All open roles at Treatwell