Software Engineer

Engg; Polska; Remote; PLN 120,000 - 180,000; Full time

Job summary

Capital on Tap is hiring software engineers for a fully remote B2B contract role. You’ll own problems end to end, from code to production, while building robust .NET solutions and modern UIs with React. Collaboration with cross-functional teams and an emphasis on quality and continuous improvement are key.

We value engineers who challenge approaches, ship high-quality software, and enjoy learning new skills in a fast-growing fintech environment serving UK and US clients.

Qualifications

• 3+ years hands-on experience in C#, .Net Core, SQL Server.
• Good testing practices (unit & integration).
• Experience with Agile development practices.

Responsibilities

• Build robust and scalable solutions using .NET technology.
• Own the SDLC from code to production, monitoring, and improvements.
• Craft slick, responsive UIs with React/JavaScript.
• Collaborate with Product Managers, QA Engineers, and peers.
• Create and maintain solid unit and integration tests.
• Troubleshoot and tweak as needed; bridge tech speak and business goals.

Skills

C#

Net Core

SQL Server

React

Job description

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!

The Role

We’re looking for Software Engineers to help us build the products that small businesses across the UK and US rely on every day. You'll work across cross-functional teams alongside Product Managers, QA Engineers, and fellow Software Engineers, owning problems end to end, from the first line of code through to production, monitoring, and continuous improvement. This isn't a role for someone who wants to be handed a ticket and told what to build. We're looking for engineers who understand the problem, challenge the approach when it needs it, and take pride in the quality of what we ship. We only build what the customer wants.

This is a remote B2B contract role. This is a multiple-headcount role, so please don't be put off if you've seen it advertised for a while.

What You’ll Be Doing

• 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.
• You’ll craft slick, responsive user interfaces with modern JavaScript frameworks (React), making sure our products don’t just work, they feel great to use.
• 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

• A minimum of 3+ years hands‑on experience in C#, .Net Core, SQL Server, ideally JavaScript and React also!
• 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.

Our Tech Stack

Backend: C#, .Net; Frontend: React, JavaScript; Mobile: Flutter, Dart; Databases: SQL Server, MongoDB; Cloud: Azure & GCP.

Interview Process

• First stage: 30‑minute intro, CV review, and values with a Talent Partner.
• Second stage: 45‑minute "Tech Chat" with a 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.

Other Info

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• Email [e-mail] if you have any questions.