Principal .NET Developer

CompanyHarvey Nash

LocationLondon Area, United Kingdom

Posted At11/13/2025

UK Visa Sponsorship Analytics

Occupation Type

Programmers and software development professionals

Occupation Code Skill LevelHigher Skilled

Sponsorship Salary Threshold

£54,700 (£28.05 per hour)

Occupation rate applies

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Description

Principal/Technical Lead -.NET

Remote / Hybrid (occasional travel to London will be required)

Salary - £80,000-£95,000 (Maybe scope for slightly more)

I’m working with an award-winning, industry-leading PropTech company that’s building pioneering technology for smart building management and digital tenant experiences. They’re a fast-growing scale-up now looking for a Principal Engineer (C# .NET) to help shape their engineering direction and drive technical excellence across their core platform.

You’ll lead the development of their Bookable Services systems — the technology behind meeting room, desk, parking, and amenities bookings for major commercial real estate clients. It’s a hands-on, influential role where you’ll work closely with the CTO and product leadership team to set the roadmap and mentor developers.

What you’ll be doing

Design, build, and maintain booking and analytics systems used by high-profile clients
Champion engineering best practices, performance, and reliability
Drive technical improvements and manage tech debt across systems
Collaborate with other technical leads and senior stakeholders to align on architecture and delivery
Mentor developers and foster a high-performing, collaborative team culture

What you’ll bring

Strong experience delivering complex solutions with C# .NET, SQL, and MongoDB (or similar)
Strong understanding of software and system design patterns
Experience working with cloud-native (AWS) distributed systems
TDD/BDD approach with a passion for clean, maintainable code
Excellent communication skills and ability to influence technical direction
Bonus: experience with React and TypeScript, or large-scale booking systems

What’s on offer

Salary: Up to £95,000 depending on experience (maybe scope for more)
Location: Remote or hybrid, with occasional travel to London (Aldgate)
Contract: Permanent, full-time
Benefits: Private medical insurance, training and development budget, employee rewards and discounts, and the opportunity to help shape team culture and technical direction

If you’re a seasoned engineer who enjoys technical ownership, mentoring others, and helping build smarter, more connected workspaces, this could be a great fit.