Principal Software Engineer .Net

Primis; Remote; GBP 90,000 - 110,000; Full time

Job summary

A global payment platform is hiring a Principal Software Engineer specializing in .NET to design and develop key platform services and APIs. With a salary range of £90,000-£110,000, the role is fully remote for candidates in the UK. The ideal applicant will have over 10 years of software engineering experience, leading architectural decisions, and driving system performance. The company offers generous annual leave, comprehensive healthcare, and a supportive environment for diverse applicants.

Benefits

45 days annual leave plus bank holidays

Comprehensive private healthcare

Annual learning budget for courses and certifications

Transparent career progression

Qualifications

• 10+ years of experience in software engineering with proven architectural leadership.
• Proficient in developing mission-critical platform services and APIs.
• Experience in event-driven and microservices-oriented architecture.

Responsibilities

• Design and develop mission-critical platform services, APIs, and merchant portals.
• Drive performance optimisation and system reliability through engineering.
• Partner with cross-functional teams to deliver solutions.

Skills

C#

.NET Core

Architectural leadership

Performance optimisation

System reliability engineering

Tools

Azure

SQL

RabbitMQ

Job description

Principal Software Engineer .NET

£90,000-£110,000

Remote (UK)

Do you thrive on building scalable solutions that power commerce worldwide?

We're partnering with a rapidly expanding global payment platform fresh off a transformative acquisition. They're engineering a robust, merchant‑centric ecosystem built on quality, resilience, and scale - and they need exceptional .NET Software Engineers to drive this evolution.

Your Impact

• Design and develop mission‑critical platform services, APIs, and merchant portals
• Drive performance optimisation and system reliability through intelligent engineering
• Champion engineering excellence in architecture, code quality, and delivery
• Partner with cross‑functional teams to deliver solutions that solve genuine business challenges

Tech Stack

• Core: C#, .NET Core
• Architecture: Event‑driven, microservices‑oriented design
• Cloud: Azure (AWS experience valued), Infrastructure‑as‑Code
• Data: SQL, caching strategies, message brokers (RabbitMQ, etc.)
• Frontend: HTML, CSS, JavaScript
• DevOps: CI/CD pipelines, Behaviour‑Driven Development, modern agile methodologies

What You Bring

• 10+ years of software engineering with proven architectural leadership - you shape technical strategy and navigate complex system design with confidence

What's In It For You

• Fully remote across the UK & Ireland
• 45 days annual leave plus bank holidays
• Comprehensive private healthcare for you and your family
• Annual learning budget for courses and certifications
• Transparent career progression

*Please note that this opportunity does not support visa sponsorship

Research indicates that men will apply to a role when they only meet 50‑60% of the descriptions, however, when looking at women and other minority groups, they can look for up to a 99% match in order to apply to a role. If you feel you are a fit for our role, please still apply, don’t worry if you don’t tick every single box. We’d still love to hear from you. We encourage underrepresented talent to apply to all our roles & support accessibility needs.