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Senior Full Stack Web Developer

I4

Cardiff

On-site

GBP 50,000 - 60,000

Full time

30+ days ago

Job summary

A leading technology company in Cardiff seeks a Senior Full Stack Developer to lead web application development. You'll collaborate with teams to create high-performance solutions, mentor junior developers, and optimize workflows using modern tools like Symfony and Vue.js. Enjoy a supportive environment with flexible hours and excellent benefits.

Benefits

Free Bupa healthcare and dental plans
Flexible working hours
Annual salary reviews
Performance-based bonuses
Birthday and workiversary off
Regular team socials
City centre parking
Referral bonus

Qualifications

  • Proven experience leading development projects.
  • Solid understanding of Git and APIs.
  • Passion for scalable, maintainable applications.

Responsibilities

  • Leading the development of new features.
  • Mentoring junior developers and conducting code reviews.
  • Driving scalable and maintainable solutions.

Skills

Git
APIs
Problem-solving
Communication
Collaboration
Scalability

Tools

Symfony
Vue.js
Craft CMS
MySQL
Webpack
Composer
NPM

Job description

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Senior Full Stack Web Developer, Cardiff

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Client:

I4

Location:

Cardiff, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Reference:

3b415ef9a900

Job Views:

7

Posted:

25.06.2025

Expiry Date:

09.08.2025

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Job Description:

Senior Full Stack Web Developer
Location:
Fully in-house, Cardiff
Salary: Up to £60,000 per annum

We’re looking for a Senior Full Stack Developer to take a key leadership role in building and maintaining high-performance web applications. Working in-house from our Cardiff office, you’ll collaborate closely with designers, marketers, and other teams to deliver exceptional digital experiences using Symfony, Vue.js, Craft CMS, and MySQL.

What You’ll Be Doing

  • Leading the development of new features and refining existing systems to ensure a seamless user experience.
  • Driving scalable, efficient, and maintainable solutions from concept through to deployment.
  • Mentoring junior developers, conducting code reviews, and maintaining high technical standards across the team.
  • Collaborating across the business to ensure best practices and cross-functional alignment.
  • Using tools like Webpack, Composer, and NPM to optimise workflows.
  • Contributing to continuous integration and deployment improvements.
  • Supporting the modernisation of our tech stack and development processes.

We value a strong, in-person, team-driven culture where developers collaborate, share knowledge, and support each other’s growth.

What We’re Looking For

  • Proven experience leading development projects and mentoring other developers.
  • Solid understanding of Git, APIs, and package managers (e.g. Composer, NPM).
  • Comfortable working with and improving legacy codebases.
  • A proactive problem-solver who performs well under pressure.
  • Strong communication and collaboration skills.
  • Passion for building scalable, maintainable applications.
  • A commitment to diversity, equity, and inclusion—we value different perspectives and experiences.

Bonus Skills

  • Experience with CI/CD pipelines and DevOps environments.
  • Familiarity with automated testing frameworks.
  • Knowledge of the home-buying or moving industry.
  • Interest in sustainability and eco-conscious technology.

Why You’ll Love Working Here

  • Modern, well-equipped office space built for collaboration and innovation
  • Annual salary reviews and performance-based bonuses
  • Free Bupa healthcare and dental plans to support your wellbeing
  • Your birthday, workiversary, and two weeks off at Christmas – time off that matters
  • Regular team socials and monthly takeaway Fridays
  • £1,000 referral bonus and long-service rewards
  • Free city centre parking for convenience
  • Flexible working hours between 6 AM and 8 PM – work at your best pace
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