Senior Software Engineer (C# Fintech)

TL;DR

Senior Software Engineer (C#): Designing and evolving high-volume backend services for a primary payment gateway platform with an accent on security, scalability, and reliability. Focus on building secure payment transactions, optimizing performance, and mentoring engineers to ensure operational excellence in high-availability environments.

Location: Remote, must be based in the UK

Salary: £50,000 - £65,000

Company

hirify.global is a leading provider of payment gateway solutions specializing in secure card-present processing for businesses and fintech start-ups.

What you will do

• Design and deliver complex, scalable backend systems for high-performance payment processing.
• Take ownership of core gateway platform components to ensure maintainability and operational excellence.
• Identify and resolve architectural gaps, performance bottlenecks, and reliability risks.
• Mentor junior and mid-level engineers through design reviews and constructive feedback.
• Drive improvements in CI/CD pipelines, observability, and deployment automation.
• Ensure strict adherence to security and compliance standards including PCI, OWASP, and SOC2.

Requirements

• Minimum 5 years of commercial experience developing complex software applications.
• Advanced proficiency in C# (preferred) or PHP with strong OOP design principles.
• Experience with relational databases such as MySQL, SQL Server, or Oracle.
• Proven experience with cloud environments (GCP or AWS).
• Strong knowledge of security best practices (OWASP, PCI, SOC2).
• Must be based in the UK.

Nice to have

• Experience with logging systems like Logz.io.
• Experience with monitoring and alerting tools like DataDog or NewRelic.

Culture & Benefits

• Remote-first culture with a flexible time policy.
• Competitive holiday package (25 days + bank holidays, increasing with tenure).
• Private medical insurance and workplace pension scheme.
• Dedicated company training budget for professional development.
• Comprehensive wellbeing support via Lifeworks including counselling and financial support.
• Family-friendly policies including enhanced maternity and paternity pay.