Fix stalled engineering delivery without halting your business.
Hands-on executive technology leadership from early-stage scaling to complex engineering turnarounds. When delivery has stalled, cloud spend is escalating, or a high-risk rewrite threatens the business, I step in to restore velocity and stability under live production pressure.
When Leaders Call Me
Executive teams bring me in when engineering friction directly threatens commercial delivery, runway, or investment decisions.
Delivery has slowed or an unviable rewrite is on the table
- Feature releases have ground to a crawl as the engineering team expanded past 15+ developers.
- A costly ground-up rewrite is being proposed, but the timeline, capital burn, and business risks are unverified.
- Architecture bottlenecks, ballooning cloud bills, or key-person dependencies are threatening runway.
- You need veteran CTO direction to unblock delivery without adding layers of management bureaucracy.
You require independent technical due diligence or turnaround leadership
- Rapid, investor-grade technical due diligence needed in 5–7 business days before Investment Committee sign-off.
- An unexpected CTO departure or technical leadership gap inside a portfolio company.
- Fractured or siloed engineering teams failing to hit commercial post-acquisition milestones.
- Independent evidence required on IP provenance, open-source licensing risks, and infrastructure scalability.
How I Work: From Friction to Delivery
A structured, non-disruptive approach designed to diagnose root causes quickly, stabilise execution, and leave behind lasting internal capability.
Forensic Diagnosis
An objective, read-only evaluation of your codebase architecture, cloud infrastructure, and delivery flow. Within days, you receive a prioritised risk matrix and 90-day remediation roadmap with zero disruption to daily engineering work.
Targeted Stabilisation
Halting customer delivery for a 6-month rewrite is rarely viable. I step in to unblock delivery bottlenecks, resolve architectural deadlocks, control cloud spend, and establish predictable release cadences—while keeping live systems running.
Internal Autonomy
I do not believe in creating permanent consultant dependency. I mentor internal engineering leads, eliminate key-person risks, and institute repeatable engineering standards so your organisation thrives independently long after my mandate concludes.
Services & Engagement Models
Whether you need standalone diagnostic evidence to inform critical board or investment decisions, or retained executive leadership to guide a turnaround, engagements are structured with clear scope and fixed deliverables.
Independent Evidence for Critical Decisions
Rapid, forensic inspections of your code, cloud architecture, delivery pipelines, or acquisition targets. Conducted strictly via read-only access with zero disruption to daily engineering delivery.
Rapid Technology & Delivery Assessment
An objective, board-grade risk appraisal for founders and CEOs facing delivery paralysis, ballooning cloud spend, or an unverified rewrite proposal.
- Read-only review of codebase architecture, cloud infrastructure, and CI/CD pipelines.
- Two 45-minute structured interviews with key technical leaders.
- Objective analysis of technical debt, architectural bottlenecks, and key-person dependencies.
- Decision-grade RAG findings report with a prioritised 90-day remediation roadmap.
- 60-minute executive and board debrief session.
- Delivered in 3 business days from second interview.
Pre-Deal Technical Red-Flag Review
Fast-track technical risk screening for PE funds, corporate acquirers, and angel syndicates delivered in 5–7 business days before Investment Committee sign-off.
- Verification of IP provenance, third-party code ownership, and open-source licensing.
- Architecture scalability, single points of failure, and infrastructure cost health.
- Cybersecurity baseline and ISO 27001 readiness review.
- Executive summary with red-flag findings and valuation adjustment guidance.
- 45-minute Investment Committee debrief.
Full Technical Due Diligence
Exhaustive investigation for complex multi-product acquisitions, deep legacy estates, and post-merger integration planning.
- Comprehensive multi-repo inspection and architectural risk mapping.
- Engineering team capability, delivery flow, and key-person dependency analysis.
- Operational resilience, disaster recovery, and regulatory compliance audit.
- Post-deal 100-Day Technical Remediation and Value Creation Blueprint.
Hands-On Technical Leadership
When you need veteran engineering leadership on the ground to unblock delivery, mentor leads, direct architecture, or lead an operational turnaround.
Fractional CTO Advisory
Strategic governance and high-leverage architectural oversight for scale-ups needing executive direction without full-time executive payroll.
- Regular executive strategy sessions to review product architecture and delivery milestones.
- Weekly office hours and mentoring to unblock senior technical leads.
- Dedicated asynchronous Slack/Teams access for critical architecture decisions and vendor reviews.
- Board-level technology reporting and infrastructure spend governance.
Embedded Fractional CTO
Hands-on executive technical direction embedded inside your leadership team (1–2 days/week) to actively steer delivery cadences, architecture, and team growth.
- Active weekly leadership cadence driving sprint predictability, release flows, and QA standards.
- Architectural sign-off on new systems, cloud infrastructure, and technical roadmaps.
- Mentoring engineering managers and senior developers into accountable team leaders.
- Vendor governance, contract reviews, and managing nearshore/agency delivery partners.
Interim CTO Turnaround
Dedicated, hands-on operational leadership (3 to 9 months) during critical growth transitions, founder succession, post-acquisition restructuring, or M&A preparation.
- Full executive accountability for engineering delivery, architecture, and team performance.
- Stabilising release cadences, rebuilding team morale, and resolving production crises.
- Direct board representation and technology P&L governance.
- Outside IR35 engagement structured via Munci Ltd (Company No. 12053155).
Sample Deliverable: Board-Level Risk & Decision Matrix
An illustrative excerpt showing how technical findings are translated into commercial consequences, prioritised actions, and clear ownership.
| Risk Identified | Evidence Examined | Commercial Implication | Recommended Action | Owner & Timing |
|---|---|---|---|---|
| Deployment path has single key-person dependency | Git commit history, CI/CD pipeline access logs, and Tech Lead interview. |
Key-person departure would freeze client feature delivery for 6–8 weeks.
Confidence: High
|
Document AWS ECS deployment access and automate CI/CD promotion gate. |
Lead Engineer Days 1–30 |
| Proposed rewrite underestimates data migration complexity | Database schema review, 50M-row telemetry logs, and product backlog audit. |
Projected 6-month launch slips past 12 months, burning ~£240k unbudgeted capital.
Confidence: High
|
Apply Strangler Fig pattern; isolate live telemetry from legacy billing. |
Interim CTO Days 30–60 |
Battle-Tested Track Record
Every case reflects an accountable executive remit, real commercial stakes, and measurable results delivered under high-pressure scale.
ScholarPack
EdTech / SaaS Scale-Up- Mandate: Appointed to succeed the retiring founder as CTO and prepare the business for institutional sale.
- Intervention: Directed a 6-week zero-downtime migration to AWS Fargate microservices during school holidays. Instituted automated testing and ISO 27001 ISMS certification.
- Commercial Result: Maintained zero downtime during COVID-19 surges; successfully steered technical due diligence through acquisition exit by The Key.
myenergi
CleanTech / IoT Pioneer- Mandate: Founded the software engineering division from scratch as Director of Software Engineering.
- Intervention: Recruited and structured 40+ engineers across UK, Ireland, Germany, and Australia; architected AWS serverless cloud fleet (zappi, eddi).
- Commercial Result: Scaled connected IoT platform to millions of live events daily with zero hardware-bricking firmware failures.
Confidential PE Turnaround
Smart Energy IoT / Private Equity- Mandate: Interim CTO reporting directly to the CEO following corporate acquisition.
- Intervention: Unified siloed engineering teams under modern Git/CI workflows, introduced automated deployment pipelines, and deployed enterprise time-series data infrastructure (Tiger Data).
- Commercial Result: Slashed operational overhead by consolidating redundant infrastructure and established clear commercial telemetry monetisation pipelines.
Fit & Qualification
Effective advisory requires honest mutual alignment. Here is who I work with best—and when another solution is the right choice.
Best Suited To
- Seed-to-Scaleup (0 → 40+) & Complex Turnarounds: You have validated product-market fit, paying customers, and production code, but delivery velocity has stalled or architecture needs scaling.
- Founders & CEOs in Technical Inflection Points: Facing a rewrite threat, critical cloud cost review, or engineering leadership void.
- Private Equity Operating Partners: Needing fast-track pre-deal technical due diligence (5–7 business days) or interim turnaround leadership.
- Organisations Offering Sponsorship & Authority: Leadership teams prepared to provide direct executive access, transparent evidence, and the authority to act.
Not Designed For
- Pre-Revenue Ideation & MVP Development: If you have not yet validated product-market fit or built production software, senior technical leadership is unnecessary capital burn.
- Contract Staff Augmentation: I provide executive technical direction, delivery governance, and architecture leadership—not outsourced individual contributors or body leasing.
- Permanent Executive Recruitment: All mandates are structured strictly as independent advisory, fractional leadership, or interim turnaround engagements Outside IR35.
- Theoretical Process Over Working Software: Organisations that prioritise bureaucratic agile ceremonies or abstract architecture over shipping reliable software to customers.
About Gareth Thomas
I am an Interim CTO and Fractional Technical Director who works in Vans and overshirts, not corporate suits. When engineering delivery has stalled, cloud spend is spiralling, or an unviable rewrite threatens the business, you don't need corporate theatre—you need veteran technical leadership that can lead from the front and solve complex problems under live pressure.
With 20+ years in production engineering—spanning continuous 24/7 industrial systems at TATA Steel Europe, scaling hyper-growth CleanTech IoT platforms from 0 to 40+ engineers at myenergi, and directing zero-downtime cloud migrations to successful acquisition exits at ScholarPack—I step in to restore velocity, rebuild team confidence, and leave behind lasting internal capability.
I believe engineering leadership should be calm, pragmatic, and directly accountable to commercial reality. I don't use generic consulting frameworks or trendy buzzwords. I focus on first-principles problem-solving, genuine respect for engineering teams, and direct, honest communication with founders and boards.
Ready to unblock your engineering delivery?
Whether you need an objective 3-day diagnostic assessment, fractional leadership to accelerate delivery, or a veteran Interim CTO to guide a turnaround, let's have an open, confidential discussion.
- Min 00–10: Your Situation & Context — You walk through what’s stalling or changing: the delivery friction, missed milestones, rewrite pressure, or leadership transition.
- Min 10–20: Engagement Parameters & Complexity — We clarify the boundaries: repo size, team structure, cloud estate, stakeholder dynamics, and the exact business outcome you need to achieve.
- Min 20–30: Mutual Fit & Statement of Work — We establish whether there is mutual fit and define the right engagement vehicle—scoping a 3-day diagnostic sprint, fractional advisory, or an interim mandate, with clear deliverables and access requirements.
Send a Confidential Brief
Prefer to send a written summary before booking a call? Outline your situation below. Submissions route directly to Gareth Thomas with a reply within one business day.