Fractional CTOs in London Making Things Happen in 2025

London Interim Chief Technology Officers to Know

London is where scale meets sophistication. It’s a global epicenter of finance, tech, media, health innovation, and climate solutions. From Shoreditch startups to Canary Wharf fintechs to B2B SaaS firms tucked behind heritage facades, the capital’s innovation ecosystem is rich, fast-moving—and increasingly flexible. Especially when it comes to executive technology leadership.

In this high-cost, high-stakes environment, more organizations are turning to fractional CTOs—interim or part-time Chief Technology Officers who embed with teams to drive platform development, scale engineering functions, lead tech transformations, or stabilize product teams without requiring a full-time, permanent hire.

At Digital Reference, we’ve curated a list of London-based fractional CTOs who aren’t just advising—they’re shipping code, mentoring tech leads, and guiding strategy across startups, PE-backed scale-ups, and mission-driven enterprises.

How We Choose London’s Fractional CTOs

Digital Reference applies a consistent and transparent methodology across markets:

✅ Clearly operating in a fractional, interim, or embedded CTO capacity
✅ Based in or actively serving the London metro
✅ Public presence on LinkedIn, portfolio sites, or executive advisory firms
✅ Track record of technical leadership, platform building, or organizational transformation
✅ Strong alignment with our ethos: trust, delivery, and referenceability

This is not a list of theorists. It’s a list of doers.

London Fractional CTOs to Know

🔹 James Hobbs

Fractional CTO | Technical Due Diligence Advisor | SaaS Growth Strategist
James helps VC- and PE-backed businesses scale their technology with confidence. As a fractional CTO, he often joins companies during investor transitions, product pivots, or team restructuring. Known for his calm leadership style and technical depth, James works closely with founders and boards to stabilize roadmaps and implement strong architectural foundations.

🔍 Specialties: Technical due diligence, SaaS scaling, engineering org design
📍 Based in: London, UK

🔹 Petros Demetriades

Startup CTO | Web3 Strategist | Early-Stage Builder
Petros partners with web3, blockchain, and distributed tech startups in London and across Europe. As a fractional CTO, he supports founders through concept validation, MVP development, and platform architecture. He’s known for his ability to translate technical risk into business clarity—especially in uncharted or bleeding-edge spaces.

🔍 Specialties: Web3, DeFi infrastructure, MVP acceleration
📍 Based in: London, UK

🔹 Giulio Pezzulli

CTO-as-a-Service | Digital Product Architect | Tech Advisor
Giulio helps early-stage and growth-stage companies scale their platforms with minimal tech debt. He brings hands-on architecture expertise, but also understands the product and design side of development—making him a great choice for non-technical founders. Giulio supports companies from pre-seed through Series B with a calm, grounded leadership style.

🔍 Specialties: Scalable architecture, tech team coaching, SaaS platforms
📍 Based in: London, UK

🔹 James Stanley

Fractional CTO | Engineering Advisor | Cloud-Native Transformation Expert
James specializes in helping companies shift from monolith to microservices, and from chaos to clarity. As a fractional CTO, he’s often called into teams in transition—whether that’s due to funding, team scaling, or post-acquisition integration. He’s especially trusted for cloud-native refactors and product-to-platform shifts.

🔍 Specialties: Cloud architecture, platform transitions, dev team scale-up
📍 Based in: London, UK

🔹 Jerry Boersma

Interim CTO | B2B SaaS Specialist | Fractional Technology Executive
Jerry brings the experience of both hands-on coding and executive strategy to his work. With a background in building platforms for enterprise clients, Jerry helps SaaS businesses scale smartly. He’s often the “glue” between product and engineering in fast-moving orgs, providing alignment, mentorship, and technical confidence to non-technical stakeholders.

🔍 Specialties: SaaS platforms, engineering hiring, enterprise integrations
📍 Based in: London, UK

🔹 Andrew Bird

Fractional CTO | Technical Due Diligence | Systems Thinker
Andrew is a trusted voice in the London tech ecosystem, often engaged by investment firms and early-stage boards to assess tech strategy and team readiness. He brings both technical fluency and operational maturity to his work, and is known for helping companies align their tech stack with their long-term goals—not just short-term wins.

🔍 Specialties: M&A support, codebase audits, long-term tech planning
📍 Based in: London, UK

🔹 Greg Dolph

Fractional CTO | Marketplace Infrastructure Expert | Engineering Lead
Greg works with venture-backed marketplaces and B2C tech products. His fractional engagements typically focus on scaling architecture, rebuilding legacy systems, or maturing scrappy MVPs. He’s particularly strong at guiding technical teams through their next level of growth—whether that’s moving from v1 to v3, or aligning engineering with revenue goals.

🔍 Specialties: Marketplaces, re-architecture, scaling tech teams
📍 Based in: London, UK

🔹 Stephen Morris

CTO for ClimateTech | Fractional Executive | Platform Engineer
Stephen focuses on climate and sustainability startups, helping them navigate the unique demands of science-heavy, data-driven technology environments. With a background in engineering and product strategy, he brings credibility to both investor conversations and technical standups. Stephen helps companies move from prototype to product—without losing mission clarity.

🔍 Specialties: ClimateTech, platform architecture, seed-to-scale guidance
📍 Based in: London, UK

🔹 Garry Taylor

Fractional CTO | Scale-Up Specialist | Technical Advisor
Garry helps businesses facing platform instability, stalled engineering teams, or urgent refactoring needs. As a fractional CTO, he’s especially valuable in pre- and post-funding scenarios, when clarity on the tech roadmap is critical. Garry works across fintech, ecommerce, and consumer tech, often serving as a steady hand in times of change.

🔍 Specialties: Legacy system modernization, team rebuilds, post-funding architecture
📍 Based in: London, UK

Why London’s Startups and Scale-Ups Are Going Fractional

In a global city with sky-high operating costs and intense investor scrutiny, fractional leadership provides unmatched flexibility. London-based companies are turning to part-time or interim CTOs when:

• 🔍 Facing technical due diligence or preparing for Series A/B
  
  
• 🔄 Rebuilding or stabilizing legacy architecture
  
  
• 🧠 Coaching or supplementing a junior or first-time CTO
  
  
• 🚀 Releasing version 2.0 or expanding into new geographies
  
  
• 💼 Aligning tech with compliance, data privacy, or platform security standards
  
  

Fractional CTOs are stage-aware, cost-conscious, and reputation-sensitive—making them ideal for London’s multifaceted tech scene.

Why These Leaders Stand Out

Each of these London-based CTOs brings:

✅ Strategic context and technical leadership
✅ Operational maturity and clear communication
✅ Strong references and a history of repeat engagements
✅ A “builder” mindset, not just an advisory posture
✅ Confidence with VCs, boards, founders, and product leads

They don’t just stabilize—they accelerate.

More from Digital Reference

📘 How to Hire a Fractional Executive
A practical guide for founders and operators navigating interim leadership.

📍 The Importance of Professional References
Explore why third-party credibility is more critical than ever in today’s trust-driven hiring market.

📍 Find Local Fractional CTOs & Chief Technology Officers Near Me
Explore why third-party credibility is more critical than ever in today’s trust-driven hiring market.

📘 Collecting Professional References: The Dos and Don’ts
References are often the make-or-break element of your next opportunity. Yet many professionals still treat the reference process as an afterthought or, worse, scramble to collect them last minute.

📗 The Talent Ecosystem: Why Fractional Operators Are Reshaping the C-Suite
Explore the structural shifts behind the rise of fractional leadership and what it means for your next hire.

Final Word: London’s Edge Is in Execution

London’s innovation economy is relentless—but smart tech leaders know when to scale people, not just product. Fractional CTOs like James Hobbs, Petros Demetriades, Giulio Pezzulli, and others on this list are already embedded in the region’s most promising companies.

They’re coaching, building, architecting, and de-risking growth—without the lag time of full-time hiring cycles.

If your startup or scale-up needs technical clarity now, don’t wait six months for a hire. Bring in a fractional leader who already knows how to lead, ship, and build teams that last.

‍