Job Description
First of all; Who are we and why do we exist?
addmustard is an award-winning brand, marketing and technology agency for entrepreneurs.
We add the strategic and creative fire-power of an advertising agency, to the precision and incision of a digital marketing agency, to grow the value of our clients’ businesses.
We are a team of 35 brilliant brand, marketing and technology experts: a core in-house team based in the United Kingdom: Soho, London and Brighton, Sussex. Supported by a network of specialists from around the world.
And who exactly are we looking for?
If you’re looking for a role where you’re handed tickets and left to build in isolation, this isn’t it.
We’re looking for a full-stack developer who wants to be at the centre of the work: not just building solutions, but shaping them. Someone who understands that great technology isn’t just functional, it drives real commercial value.
You will play a crucial part in the innovation, development and enhancement of our clients’ websites and technology, working closely with strategy, design and marketing teams to turn ideas into robust, award-winning products.
Our clients are entrepreneurial. They move fast, expect more, and rely on their technology to give them an edge. You’ll need to be just as comfortable solving complex problems as you are writing clean, efficient code.
You’ll work across a mix of ambitious startups and established businesses, covering a range of industries and technical platforms. You’ll be part of a multidisciplinary team that cares about the full journey - from first interaction through to conversion and beyond. If you take pride in both how things work and what they achieve, you’ll fit right in.
What cuts our mustard?
* You know your way around modern web technologies and frameworks (and more importantly, when to use them and when not to).
* You’ve worked with CMS platforms and understand how to balance flexibility for marketers with structure for developers.
* You’re comfortable with process but don’t hide behind it. You know when to follow, when to challenge, and how to keep things moving.
* You communicate clearly and directly. You can hold your own with developers, designers and strategists.
* You take ownership. When something breaks, you fix it. When something’s unclear, you ask. When something can be better, you improve it.
* You can juggle multiple projects without dropping standards. Different clients, different problems but same level of care and attention.
* You’re comfortable using AI tools like GitHub Copilot and Cursor for speed and efficiency, but rely on your own judgement to make sure the code is solid, maintainable, and does exactly what it should.
Objectives and responsibilities of the role
* Lead the development, enhancement and optimisation of client websites and platforms, from build through to deployment and iteration.
* Take requirements, designs and inputs from across the team and turn them into well-structured, scalable technical solutions.
* Work closely with design, strategy and marketing teams to ensure what is built performs, both technically and commercially.
* Identify and resolve technical challenges early, proposing solutions that balance speed, quality and long-term value.
* Contribute to the ongoing evolution of client platforms, continuously improving performance, user experience and conversion.
* Maintain high standards across code quality, documentation, testing and deployment practices.
* Support and contribute to a collaborative development environment, sharing knowledge, improving ways of working, and raising the bar across the team.
How are we different?
We pride ourselves on being straight-talking, diligent, good value and innovative in everything we do for our entrepreneurial clients. Equally, we pride ourselves in being open, honest, innovative and hard working in everything we do for our team.
You'll be surrounded and supported by a team who embolden and challenge you to go into every day with those values in mind. We’ve built (and are very proud of) our completely flat and integrated organisational structure – we don’t care where the good ideas come from, as long as they can be turned into something astonishing and tangible.
And when those ideas get made, we love nothing more than to celebrate them.
What’s in it for you?
In return for your commitment, creativity and incredible mind, you can expect:
* To work across a diverse range of fascinating clients, each with unique problems that we can solve.
* To deliver value increases in our clients businesses that you can be proud of by helping entrepreneurs, their teams and families to realise their dreams and goals.
* To work alongside and be trained by industry experts at the forefront of brand, marketing and technology.
* Our senior management is accessible, open, honest and transparent. This means we all care about you and your development, progression, success and happiness.
* Flexi time and unlimited holiday: flexible working hours and hybrid working structure, sharing your time between working from home and our offices in eclectic Soho and Brighton’s Laines.
* Be part of an amazing, sociable and supportive team.