Senior Software Engineer (AI)

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📍 Porto

About this role

We’re Capital on Tap 👋
💳 Capital on Tap started because small businesses were underserved. Big banks were slow, their products weren't fit for purpose, and small business owners often couldn't access what they needed. We set out to fix that.

Today we're a financial platform - not just a credit card company. We offer a best-in-class business credit card, SME-focused spend management platform, a savings product that hit £1 billion in funds within its first year, and a growing suite of tools and financial products that make running a small business easier. 

1,000+ employees, £20bn in annual card spend, 200,000+ customers, 17,000+ Trustpilot reviews averaging 4.7 stars, and we're profitable. We’ve done a pretty good job so far, but we’re just getting started! 

📈Check out the development opportunities in the Software Engineering team

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

Salary: €55,000-70,000

AI Engineering at Capital on Tap

We're building a small team of ~3 AI-specialist software engineers who embed directly within product teams to deliver intelligent features. Rather than operating as a separate unit, you'll work alongside existing teams as an internal consultant, helping them deliver AI-powered capabilities whilst building their skills through hands-on collaboration and structured training. Part of the role has a hand in upskilling the wider Engineering department through workshops, documentation, and knowledge transfer.

What You’ll Be Doing
You'll partner with product teams to build and deliver AI features, working embedded within their squad structure. Your role is to enable teams to successfully deliver AI capabilities while upskilling them to own the features long-term.

  • You’ll build robust and scalable solutions using .Net technology
  • From the first line of code to production, monitoring, and continuous improvement - you’ll own the SDLC
  • Teamwork makes the dream work - you’ll partner with Product Managers, QA’s, and fellow Software Engineers
  • You’ll build bulletproof unit and integration tests to keep our software sharp and our users happy
  • Bugs happen. When they do, you’ll be ready to troubleshoot and tweak as needed
  • You’ll bridge the gap between tech speak and business goals, ensuring everyone’s on the same page and moving forward together

 

We’re Looking For 🔎
Required skills:

  • 4+ years hands-on experience in C#, .NET Core
  • Good testing practices, in both Unit and Integration testing
  • Good understanding of database technologies
  • Experience in using Agile development practices
  • A passion for learning new skills and technologies
  • A proactive, supportive, and collaborative team player

 

Interview Process 🤝

  1. First stage: 30-minute intro, CV review, and values with Talent Partner
  2. Second stage: 45-minute “Tech Chat” with our Engineering Manager
  3. 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.

 

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.)

Frequently Asked Questions

Is the salary disclosed for the Senior Software Engineer (AI) position at capitalontap?
The salary for this Senior Software Engineer (AI) role at capitalontap is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Senior Software Engineer (AI) position at capitalontap located?
This Senior Software Engineer (AI) role at capitalontap is based in Porto. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Which team or department does the Senior Software Engineer (AI) at capitalontap belong to?
This Senior Software Engineer (AI) position is part of the IT department at capitalontap. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Senior Software Engineer (AI) position at capitalontap?
Click the "Apply Now" button on this page. You will be redirected to capitalontap's official application portal hosted on greenhouse where you can submit your application directly.
When was the Senior Software Engineer (AI) job at capitalontap posted?
This Senior Software Engineer (AI) position at capitalontap was posted on Oct 1, 2025. Apply as soon as possible — early applications are often reviewed first.
Senior Software Engineer (AI)
capitalontap
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