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Stackfix

Founding Applied AI Engineer

Holborn, London, UK
Software Development · Software
We grow businesses by building AI
Active
a week ago
Responds to
100% of requests
Responds in
2 days
Requests
0 pending
Conversations
4 started

Skills & Experience

Job roles: AI Engineer, Full Stack
Experience level: Mid, Senior, Lead
Tech stack/tooling used: Django, PostgreSQL, Python, JavaScript
Core skills considered: Django, PostgreSQL, Python, JavaScript

Logistics

Base salary: £90K - £120K
Employment type: Permanent
Remote working: On-site
Visa sponsorship: Not available

Job Description

What Stackfix does

We build production AI systems inside real businesses.

Examples: A factory processes orders by hand. A distributor loses deals because quotes take days. An international law firm has people copying data between systems.

We turn this manual work into production software that improves throughput, accuracy, and margin.

The role

You will own AI builds end-to-end for clients.

You will:

  • Sit with operators on-site and map how work actually happens
  • Build and ship working software
  • Integrate with whatever the client already runs
  • Own the system after it goes live

About us

Paddy (https://www.linkedin.com/in/paddystobbs) worked at Google, and later founded Jukedeck, a neural-networks-for-music company, which TikTok acquired.

Tom (https://www.linkedin.com/in/tomdekan) founded and sold an HR software company in 2023, and has 9+ years building AI systems, including using GPT2 when it was released.

We are backed by Seedcamp, Chalfen Ventures, and angels from DeepMind.


Tech stack

We use boring software wherever possible: our aim is to minimize complexity. The stack varies per customer. Our default stack is:

  • Python
  • Django
  • HTMX / Alpine.js / Typescript
  • Postgres

Who this role is for

We care about systems you have built, not job titles. You should apply if:

  • You have 4+ years building production software
  • You are strong in Python
  • You like talking to users
  • You can reason clearly about reliability, evals, data quality, and edge cases
  • You care whether software creates measurable value

We also look for evidence of sustained excellence. The domain matters less than the pattern: high standards, long attention span, and visible output. Examples: Paddy (CEO) was previously a professional singer. Tom (CTO) played waterpolo for GB.

Who this role is not for

Please don’t apply if:

  • You want a remote-first role
  • You don’t want to understand how a client makes money
  • You dislike talking to customers
  • You want a narrow backend role or frontend role

This is for someone who wants work to be one of the main places they grow.

We optimise for autonomy, quality, and sustained output, not long hours.

What you get

  • Ownership. You will own client builds from discovery to production.
  • Direct commercial exposure. You will see how companies make money, where they leak margin, and where software creates value.
  • Founder-level learning. You will work directly with Paddy and Tom, two exited founders, and see how we sell, scope, negotiate, build, hire, and run the company.
  • Meaningful upside. £90,000-£120,000/year salary + equity + a new MacBook Pro + subscriptions to any AI models you need + a central private office in Holborn.

Interview Process

  1. Intro chat, 15 minutes - Fit, background, and what you are looking for.
  2. Technical screen, 60mins - A programming task (<60mins) and discuss it.
  3. Technical interview. - A realistic engineering discussion. No trick questions or leet code questions.
  4. In-person working session, 2-3 hours, in Holborn - A realistic problem based on the kind of work we do. No whiteboard theatre. No unpaid client delivery.
  5. Offer

Skills of candidates in conversation

Python
React
Typescript
AWS
Machine Learning
Tom on cord
CTO
Active a week ago
Stackfix are no longer hiring for this position.

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Starling Bank on cord

Starling Bank

Full Stack Engineer (ML Ops)

London, UK
FinTech · Banking · Finance
A better bank for everyone
Active
over 6 months ago
Responds to
0% of requests
Responds in
1h 55m
Requests
7 pending

Skills & Experience

Job roles: Full Stack
Experience level: Mid, Senior
Core skills considered: Java, React, Redux, AWS, JavaScript

Logistics

Base salary: £70K - £110K
Employment type: Permanent
Remote working: Hybrid (up to 2 remote days p/w)
Visa sponsorship: Not available

Job Description

Starling is the UK’s first and leading digital bank on a mission to fix banking! Our vision is fast technology, fair service, and honest values. All at the tap of a phone, all the time.

Starling is the UK’s first and leading digital bank on a mission to fix banking! We built a new kind of bank because we knew technology had the power to help people save, spend and manage their money in a new and transformative way.

We’re a fully licensed UK bank with the culture and spirit of a fast-moving, disruptive tech company. We’re a bank, but better: fairer, easier to use and designed to demystify money for everyone. We employ more than 3,000 people across our London, Southampton, Cardiff and Manchester offices.

Our technologists are at the very heart of Starling and enjoy working in a fast-paced environment that is all about building things, creating new stuff, and disruptive technology that keeps us on the cutting edge of fintech. We operate a flat structure to empower you to make decisions regardless of what your primary responsibilities may be, innovation and collaboration will be at the core of everything you do. Help is never far away in our open culture, you will find support in your team and from across the business, we are in this together!

The way to thrive and shine within Starling is to be a self-driven individual and be able to take full ownership of everything around you: From building things, designing, discovering, to sharing knowledge with your colleagues and making sure all processes are efficient and productive to deliver the best possible results for our customers. Our purpose is underpinned by five Starling values: Listen, Keep It Simple, Do The Right Thing, Own It, and Aim For Greatness.

Hybrid Working

We have a Hybrid approach to working here at Starling - our preference is that you're located within a commutable distance of one of our offices so that we're able to interact and collaborate in person. We don't like to mandate how much you visit the office and work from home, that's to be agreed upon between you and your manager.

Our Data Environment

Our Data teams are excited about the value of data within the business, powers our product decisions to improve things for our customers and enhance effective and agile decision making, regardless of what their primary tech stack may be. Hear from the team in our latest blogs or our case studies with Women in Tech.

We are looking for talented data professionals at all levels to join the team. We value people being engaged and caring about customers, caring about the code they write and the contribution they make to Starling. People with a broad ability to apply themselves to a multitude of problems and challenges, who can work across teams do great things here at Starling, to continue changing banking for good.

Requirements

We have built our entire banking platform in house and mostly in Java. We are looking for people who want to work on building the tooling that is used by our engineers on a daily basis.

We are looking for people who are truly full stack, and are as comfortable polishing their javascript front end as they are debugging the innards of their java applications database interactions, or standing up infrastructure with terraform. We are looking for people who can:

  • Design REST apis.
  • Code backend services, ideally using Java, or another other server side compiled language.
  • Develop modern front ends, ideally using React and Redux.
  • Get their code into the cloud and support it there, ideally on AWS.
  • Believe in clean coding, simple solutions, automated testing and continuous deployment.
  • Like to take ownership of a feature from the original idea through to live.
  • Think (like us) that a small number of empowered developers is the right way to deliver software.

Company Benefits

  • 33 days holiday (including flexible bank holidays)
  • An extra day’s holiday for your birthday
  • 16 hours paid volunteering time a year
  • Part-time and/or flexible hours available for most roles
  • Salary sacrifice, company enhanced pension scheme
  • Life insurance at 4x your salary
  • Hybrid/remote working
  • Private Medical Insurance with VitalityHealth including mental health support and cancer care. Partner benefits include discounts with Waitrose, Mr&Mrs Smith and Peloton
  • Generous family-friendly policies
  • Varied social groups set up and run by our employees
  • Perkbox membership giving access to retail discounts, a wellness platform for physical and mental health, and weekly free and boosted perks
  • Access to initiatives like Cycle to Work, Salary Sacrificed Gym partnerships and Electric Vehicle (EV) leasing

Full details are available on our careers site

Interview Process

Interviewing is a two way process and we want you to have the time and opportunity to get to know us, as much as we are getting to know you! Our interviews are conversational and we want to get the best from you, so come with questions and be curious. In general you can expect the below, following a chat with one of our Talent Team:

  • Stage 1 - 30 mins with one of the team
  • Stage 2 - Take home challenge
  • Stage 3 - 90 mins technical interview with two team members
  • Stage 3 - 45 min final with an executive and a member of the people team
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