Senior Software Engineer - Remote, Build Fintech for SMB

Capital on Tap; Warszawa; Remote; PLN 180,000 - 260,000; Full time

Job summary

Capital on Tap is seeking Senior Software Engineers to help build products used by small businesses in the UK and US. You will work across cross-functional teams, owning problems end to end from first line of code through production, monitoring and continuous improvement.

This isn’t a ticket-taker role; we want engineers who challenge approaches, ensure quality, and ship what the customer wants. Join a capable, fast-moving team with a strong impact.

Qualifications

• 5+ years of hands-on experience in C#, .NET and SQL Server.
• React and TypeScript are a strong plus.
• Strong testing practices across unit and integration testing.
• Experience working in agile, cross-functional teams.

Responsibilities

• Designing and building robust, scalable solutions in .NET/C#.
• Participating in architectural decisions and technical direction.
• Collaborating with Product and QA to align on requirements.
• Writing thorough unit and integration tests and upholding code quality.
• Communicating complex engineering decisions to stakeholders.
• Mentoring and supporting engineers to raise the team standard.

Skills

C#

.NET

SQL Server

React

TypeScript

Agile

Job description

Capital on Tap is seeking Senior Software Engineers to help build products used by small businesses in the UK and US. You will work across cross-functional teams, owning problems end to end from first line of code through production, monitoring and continuous improvement.

This isn’t a ticket-taker role; we want engineers who challenge approaches, ensure quality, and ship what the customer wants. Join a capable, fast-moving team with a strong impact.