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Backend Software Engineer (AI)

London

We’re Capital on Tap 👋
💳 Capital on Tap was founded with the mission to help small business owners and make their lives easier. Today, we provide an all-in-one business credit card & spend management platform that helps business owners save time and money. Capital on Tap proudly serves over 200,000 businesses across the world and our goal is to help 1 million small businesses by 2030.

Why Join Us?
We empower you to be innovative and solve complex problems. Take ownership, make an impact, and thrive in our scaling and agile environment.

📈Check out the development opportunities in the Software Engineering team

🏢This is a Hybrid role, the Software Engineering Team works from our London Office (Moorgate) 2 days per week.

 

AI Engineering at Capital on Tap

We’re looking for an experienced Software Engineer who is passionate about moving into the AI space to join our AI Engineering team to help us build the best credit card and payment products for small businesses. 

The AI Engineering team is tasked with delivering AI-enabled products, both customer-facing and internal. It currently consists of 2 AI engineers, and we are looking for software engineers to join the team.

This is a unique opportunity for a skilled C# engineer to transition into the rapidly growing field of AI.

What You’ll Be Doing
You'll work alongside our existing AI Engineers. Your role will be to help deliver fully-productionised AI-assisted systems, such as a customer-facing chatbot. In order to do this, you will own the software development lifecycle, partner with Product Managers, and troubleshoot issues.

Your responsibilities will be:

  • Work with the AI Engineers with the building and maintenance of AI products (Python and C#), from building robust services to ensuring their seamless deployment and maintenance
  • Work closely with other engineering teams to integrate with other internal systems, in order to serve up data to the AI systems (rest APIs)
  • Take charge of automated testing of AI systems to ensure they are bulletproof before production
  • Work with our Platform teams to ensure all our infrastructure adheres to best practices
  • Enable the AI Engineers to deliver fast, by ensuring that systems are scalable, reliable and safe

We’re Looking For 🔎
Required skills:

  • Minimum 3-4 years of C# experience
  • Track record of delivering systems into production
  • Strong understanding of automated testing
  • Willingness to learn Python (Python knowledge is a bonus but not a requirement)
  • Willingness to learn how to deliver products that interact heavily with LLMs

Nice to have skills:

  • Python knowledge

Other tools we use (knowledge not required):

  • Pydantic AI, Azure Doc Intelligence, Langchain/Langgraph, LlamaIndex

Interview Process 🤝

  • First stage: 30-minute intro, CV review, and values with Talent Partner
  • Second stage: 45-minute “Tech Chat” with Team Manager
  • Final stage: 90-minute Code Pairing + 30-minute Values Interview

 

Diversity & Inclusion 🌈
We welcome, consider and encourage applications from anyone who shares our commitment to inclusivity. Join us in creating a space where authenticity thrives, and everyone can do their best work.

Great Work Deserves Great Perks
We try not to take ourselves too seriously (all the time) so we make sure our office is decked out with a pool table, arcade machine, beer tap, and a couple of office dogs thrown in for good measure. Check out our benefits:

🏥 Private Healthcare including dental and opticians services through Vitality
✈️ Worldwide travel insurance through Vitality
🎁 Anniversary Rewards (£250, £500, £750, 4-week fully paid sabbatical)
👛 Salary Sacrifice Pension Scheme up to 7% match
🏖️ 28 days holiday (plus bank holidays)
📖 Annual Learning and Wellbeing Budget
👪 Enhanced Parental Leave
🚲 Cycle to Work Scheme
🚂 Season Ticket Loan
💬 6 free therapy sessions per year
🐶 Dog Friendly Offices
🍫 Free drinks and snacks in our offices

Check out more of our benefits, values and mission here.

Other Info
👍Check out our ‘Top Tips’ for interviewing.
✔️Keep updated on new job opportunities by following us on Linkedin.
📧Email careers@capitalontap.com if you have any questions.

Excited to work here? Apply!
If you’d like to progress your career within our fast growing, profitable fintech then click apply and we will aim to get back to you within 3 working days (during busy periods this could take up to 5 working days.)

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UK DE&I Data

At Capital on Tap we are fully focused on equality and believe deeply in diversity of race, gender, sexual orientation, religion, ethnicity, ability, national origin and all the other characteristics that make us who we are. We want to be a place where a diverse mix of talented people want to come and do their best work and most importantly feel included and that they can be their authentic selves. 

In order to remain committed to our goal, we need to analyse and identify where we need to take steps to make positive impact. The first step in this process is gathering anonymous data on our candidates. We would encourage you to help us by filling in the form below.

All of the questions we ask are optional and will not affect your application. You don't have to share this with us and we won't consider it as part of your application. If you choose not to share this info, it won't impact your application in any way.

 

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