Principal Software Engineer

VanRath; Belfast; Remote; GBP 70,000 - 100,000; Full time

Job summary

A leading fintech company is seeking a Principal Software Engineer II to play a key role in building a modern payment infrastructure. This fully remote position offers flexibility while leading design and development efforts in a dynamic, collaborative environment, ideal for an experienced engineer who thrives in fast-paced settings.

Benefits

100% remote working with flexible hours

Competitive salary and benefits package

Join an agile, empowered team

Supportive and innovative company culture

Qualifications

• 10+ years in software engineering with strong design and coding experience.
• Deep experience with SaaS platforms, public APIs, and distributed systems.
• Ability to translate complex business requirements into scalable technical solutions.

Responsibilities

• Lead the design and development of key platform capabilities such as APIs and Billing.
• Provide technical leadership across multiple product teams.
• Participate in hands-on coding activities aligned with roadmap priorities.

Skills

.NET

Java

SaaS platforms

APIs

Databases

Systems integration

Job description

Principal Software Engineer II (Fully Remote)

Location: 100% Remote (UK & Ireland-based candidates preferred)
Recruitment Partner: VANRATH
Job Type: Full-time | Permanent
Industry: Fintech / SaaS / Payments
VANRATH is proud to be partnering with an innovative and rapidly scaling fintech company to recruit a Principal Software Engineer II. This is a rare opportunity to play a pivotal role in building a modern, merchant-focused ecosystem while remaining hands-on in engineering. You'll help shape the future of the company's technical direction while contributing directly to the software that powers a nationwide payment infrastructure.
This role is fully remote, offering you flexibility while working alongside a passionate, pragmatic, and forward-thinking engineering team.

The Opportunity:

As a Principal Software Engineer II, you'll lead the design, development, and strategic direction of key platform capabilities-such as APIs, Billing, Settlement, and more. This is a hands-on technical leadership role with significant influence across architecture, engineering culture, and delivery practices. You'll guide feature teams, set standards, and participate in delivering real-world solutions that serve thousands of merchants across the country.
This role is perfect for someone who thrives in a fast-moving environment, values technical excellence, and enjoys mentoring teams to build solutions that scale.

What You'll Be Doing:

• 
  Provide technical leadership across multiple product teams, setting direction and enforcing best practices
• 
  Design and implement scalable, high-performance applications and APIs
• 
  Participate in hands-on coding activities aligned with roadmap priorities (up to 50%)
• 
  Define and evolve technical standards, architecture principles, and reusable patterns
• 
  Own the technical roadmap for your domain, aligning it with business strategy
• 
  Contribute to and maintain internal documentation and knowledge-sharing initiatives
• 
  Assess and recommend new technologies and influence key build vs. buy decisions
• 
  Promote collaboration across engineering, architecture, and leadership teams
• 
  Mentor and coach software engineers to raise technical capability and delivery quality

What We're Looking For:

• 
  10+ years in software engineering, with strong design and coding experience in .NET, Java, or similar languages
• 
  Deep experience with SaaS platforms, public APIs, and distributed systems architecture
• 
  Strong background in databases, caching, systems integration, and performance optimisation
• 
  Experience in payment processing or financial services is a significant plus
• 
  Proven ability to translate complex business requirements into scalable technical solutions
• 
  Demonstrated leadership in enterprise architecture and cross-functional tech strategy
• 
  Comfortable working in a high-growth, fast-evolving environment
• 
  Strong communication skills and ability to interact effectively with both technical and non-technical stakeholders
• 
  Passion for continuous improvement, innovation, and mentoring

What's on Offer:

• 
  100% remote working with flexible hours
• 
  Work with a modern tech stack and make key architectural decisions
• 
  Join an agile, empowered team delivering real value to customers
• 
  Competitive salary and benefits package
• 
  A supportive and innovative company culture

Ready to take the lead in shaping the future of fintech?
Apply today through VANRATH to learn more about this impactful and rewarding opportunity.