Interim CTO & Fractional Technology Leadership

Rebuilding the bus whilst it's driving down the road.

Pragmatic Interim CTO and Fractional Technical Leadership for venture-backed scale-ups, private equity funds, and founder-led businesses navigating high-stakes transition.

20+ Years Production Engineering
/
Exit ScholarPack to The Key
/
0 → 40 Engineering Org at myenergi
/
Direct Outside IR35 Mandates
Selected Client Mandates & Scale-Up Track Record
ScholarPack
Exit to The Key
myenergi
0 → 40+ Org Scale
TATA Steel Europe
Enterprise Systems & Scale
UK MOD / RAF Supplier
Mission-Critical Systems
HealthTech
NHS Primary Care
Energy Helper
Live IoT Telemetry

The Munci Philosophy

Most technology advice comes from people who haven't carried the pager or managed a multi-million-pound engineering P&L. Here is how I actually operate.

01

The Excellence Paradox

The companies with the most commercial success often have the messiest codebases. Academic purity doesn't create market value; speed of learning does. I fix tech debt where it protects revenue, not where it satisfies dogma.

02

Quietly Strangling the Monolith

Ground-up rewrites are where startups go to die. I apply the Strangler Fig pattern: carving out clean, containerised microservices slice by slice while the legacy engine keeps the revenue flowing uninterrupted.

03

Treat Developers Like Adults

High trust, crystal-clear business context, and radical autonomy. I eliminate micromanagement rituals, replace ceremony with automated CI/CD pipelines, and give senior talent the safety to deliver their best work.

04

Commercial Pragmatism

Zero resume-driven development. Every architectural choice, cloud migration, and hiring decision must directly support customer retention, gross margins, or investment enterprise valuation.

"Most companies do not have the luxury of stopping everything to fix technical debt or install new frameworks. You have to rebuild the bus whilst it is driving down the road."

Gareth Thomas — Speaker, Agile on the Beach

Clear, Predictable Technology Leadership

Whether you need hands-on operational leadership through a crisis or a rapid forensic audit of an outsourced team, my engagements are transparent, high-impact, and strictly Outside IR35.

Full Mandate

Interim CTO

£1,000 - £1,250 / day

Full-time leadership (3 to 9 months) during turnaround, founder succession, or scale-up acceleration ahead of an institutional funding round or sale.

  • Full organizational and delivery leadership
  • Rebuilding release cadences and engineering culture
  • Board-level strategic reporting and CapEx/OpEx management
  • Hands-on architectural remediation without halting feature delivery
Discuss Interim Mandate
Strategic Retainer

Fractional CTO

£3,500 - £7,500 / month

1 to 3 days per week of veteran executive direction for growing businesses that need senior firepower without the cost of a full-time executive.

  • Mentoring existing technical leads and heads of department
  • Architectural governance and vendor/agency management
  • Sprint alignment and roadmap prioritization
  • Investor and board advisory representation
Inquire About Retainers
M&A & Investor Audit

Technical Due Diligence

£3,500 - £5,000 + VAT

Investor-grade technical audits for PE funds, angel syndicates, and acquiring corporations to uncover hidden technical liabilities pre-deal.

  • IP ownership and open-source license compliance check
  • Architecture scalability and infrastructure resilience
  • Cybersecurity baseline & ISO 27001 readiness review
  • Clear Red Flag Report and valuation adjustment guidance
Request Due Diligence
Inspection Methodology

Rapid Forensic Audit Without Disrupting Delivery

A predictable 3-day investigation conducted strictly via read-only access - diagnosing root technical liabilities before they threaten commercial growth.

01 / SCAN
Hours 0 - 24

Read-Only Forensic Audit

Direct inspection of Git commit history, CI/CD pipeline health, AWS/cloud IAM and cost ledgers, and test coverage.

Zero production access or team disruption
02 / TRIAGE
Hours 24 - 48

Friction & Risk Synthesis

Forensic mapping of key-person dependencies, architectural single points of failure, tech debt accrual, and vendor lock-in risks.

Rigorous traffic-light liability grading
03 / DELIVER
Hours 48 - 72

Dossier & Strategic Debrief

Delivery of the 3-Page Traffic Light Report, a prioritized 90-day remediation roadmap, and a 60-minute board/founder debrief call.

Actionable roadmap with zero agency bias

Deliverable Sample: The 72-Hour Traffic Light Diagnostic

Forensic findings and board-level risk classifications extracted from live client engagements.

Battle-Tested Track Record

From scaling hyper-growth hardware platforms to safeguarding safety-critical defence systems, my leadership delivers measurable commercial outcomes.

ScholarPack EdTech / SaaS
10% of UK Primary Schools
Rapid 100% YoY growth overwhelmed legacy monolithic servers, threatening morning registration availability across 3,000+ schools.
  • Zero downtime during COVID-19 remote schooling surges
  • Engineered team scaled from 4 to 18 high-performing engineers
  • Successfully steered technical due diligence through acquisition by The Key
Technical Mandate & Architecture

Succeeded the retiring founder as CTO. Designed a 6-week zero-downtime migration to AWS Fargate microservices during school holidays. Instituted TDD and daily CI/CD deployments. Directed ISO 27001 ISMS certification.

AWS Fargate PHP / Python ISO 27001 CI/CD
myenergi CleanTech / IoT
0 to 40+ Engineers
Explosive consumer demand for smart EV chargers (zappi) outstripped software capabilities, with fragmented teams across firmware, mobile apps, and cloud.
  • Replaced monolithic on-premise infrastructure with resilient AWS services
  • Formed factory automated test rigs and manufacturing data telemetry
  • Recognised on the Sunday Times Fast Track 100 for hyper-growth
Technical Mandate & Architecture

Founded the software engineering department from scratch. Recruited and structured 40+ engineers across the UK, Ireland, Germany, and Australia. Designed the global AWS cloud architecture supporting millions of connected IoT devices.

AWS Serverless IoT Core React Native TypeScript
UK MOD / RAF Supplier Mission Systems
3 Concurrent Delivery Streams
Safety-critical flight mission planning software was bottlenecked by a single development pipeline, delaying major international defence deliverables.
  • Expanded capacity from 1 constrained pipeline to 3 concurrent streams
  • Supplied mission-critical systems to the RAF and partner air forces
  • Upheld strict safety-critical assurance and security governance
Technical Mandate & Architecture

Partnered with the CTO to restructure software delivery. Decoupled feature updates from flight-safety compliance packages, establishing a predictable 3-week LTS release cadence.

Mission Critical Flight Safety LTS Cadence Defence Systems
Looking for sector-specific deep dives? Explore the CleanTech & Smart Energy Page or review the complete track record in the Executive Briefing Pack.

Industry Talks & Technical Concepts

Regular speaker at national and regional software conferences, addressing the human and architectural challenges of scaling systems under pressure.

Agile on the Beach • National Conference

Quietly Strangling the Monolith

A pragmatic deep dive into decomposing legacy systems without risking the business. Demonstrating how to use the Strangler Fig pattern, event interceptors, and AWS Fargate to migrate high-traffic production workloads incrementally.

"Never announce a great migration. Just deliver value, slice by slice, until the old server is quietly powered down."
Agile on the Beach • National Conference

The Excellence Paradox

An exploration of why hyper-growth commercial winners often struggle with messy codebases, and why dogmatic engineering purity is often the enemy of product-market fit. How engineering leaders can reconcile commercial reality with technical health.

"If your codebase is pristine but your company is insolvent, you didn't win. Engineering exists to power business success."
Community Leadership

Digital Lincoln & Code Club

Chair of Digital Lincoln, curating regional meetups and knowledge-sharing sessions for 500+ software engineers, engineering managers, and local technology founders. Active STEM Ambassador and Code Club volunteer.

"Great engineering ecosystems are built on mentoring, openness, and practical collaboration."
Director & Principal Consultant

Gareth Thomas

MEng (Hons), CSP-SM
  • Operating Entity Munci Limited (Co. No. 12053155)
  • Location & Base Lincoln, UK (London / Hybrid)
  • Tax & Compliance VAT Registered • Strictly Outside IR35
  • Direct Mandates Interim CTO (Full) • Fractional (1-3d/wk)

I have spent over 20 years building software systems and the engineering teams behind them.

I get brought in when a company hits a critical inflection point: when engineering delivery has stalled, technical debt is threatening business growth, or an organisation needs professionalising ahead of an acquisition or fundraising round.

My background spans the full spectrum of software delivery - from managing continuous industrial systems at TATA Steel Europe and scaling venture-backed SaaS platforms to acquisition exits (ScholarPack exit to The Key), through to engineering mission-planning systems supplying the UK Ministry of Defence.

I don't borrow generic consulting playbooks or trendy buzzwords. I build pragmatic frameworks from what actually works in the trenches - combining calm, first-principles problem solving, high empathy for engineers, and uncompromising commercial accountability.

20-Year Delivery Trajectory
2004 - 2014
TATA Steel Europe
Process Automation Lead

Continuous 24/7 heavy industrial systems, fail-safe architecture, and zero-tolerance operational resilience.

2015 - 2020
ScholarPack
Scale-Up CTO

Zero-downtime AWS Fargate migration during term breaks, scaled team 4 to 18, steered acquisition exit to The Key.

2020 - 2023
myenergi
Head of Software

Founded software engineering department from 0 to 40+ engineers across 4 countries; hyper-growth CleanTech IoT.

2023 - Present
Munci
Director & Interim CTO

Hands-on turnaround leadership, PE technical due diligence audits, and defence mission systems delivery.

MEng Electronics & Computing (Swansea Univ) Certified Scrum Professional (CSP-SM) ISO 27001 ISMS Lead Implementation National Tech Conference Speaker

Ready to rebuild your engineering momentum?

Whether you need a 72-hour diagnostic health check, fractional leadership to unblock delivery, or a veteran Interim CTO to guide a turnaround, let's have an honest discussion.

Send a Confidential Enquiry

Prefer to send a written brief before jumping on a call? Outline your situation below and I will respond directly within one business day.

Direct to Gareth Thomas. Commercial NDA confidentiality observed. Zero marketing spam.