Marc RobertsFractional CTO and technical due diligence
REF.Marc Roberts

Founding CTO. Available two days a week.

I help investors judge technical teams before they invest, and founders build them afterwards. Two marketplace businesses taken from zero — one to 250,000 members.

AVAILABILITY
2 DAYS / WEEK
ENGAGEMENTS
1 OF 2 OPEN
SECTOR FOCUS
SHARED MOBILITY
UPDATED
2026-08-25
PROOF.Track record
250,000+
members on a platform I built from zero
Six-figure
annualised savings from AI and automation in production
2011 → today
Built two P2P car-sharing businesses. One too early. One at the right time.
SVC.Services

What I do

  • SVC.01

    Fractional CTO

    For funded startups that need senior technical leadership before they can justify a full-time hire. Strategy, architecture decisions, hiring, and the judgement calls that are expensive to get wrong. One or two days a week, three-month minimum.

    From £4,000/month

  • SVC.02

    Technical due diligence

    For investors deciding whether the technology and the team behind a deal hold up. Architecture, delivery capability, security posture, technical debt with a remediation cost attached, and an honest read on whether the AI claims are real. Written report and verbal readout in five to ten working days.

    From £6,000 per deal

  • SVC.03

    Shared mobility

    Platform strategy, build-versus-buy, telematics and keyless access procurement, and scheme delivery for car clubs, operators and local authorities. The sector I’ve spent my career in.

    Retainer or project

WORK.Selected work

Selected work

  1. WORK.01

    Hiyacar car-sharing platform, 0 → 250,000 members

    Founding CTO. Built the platform, the engineering team, and the keyless access and telematics integration that made unattended handover work — without it, every booking needs the owner and the renter in the same place at the same time. Later interim CEO.

  2. WORK.02

    Julie AI, built from zero

    An AI parenting partner for UK families with children aged 0–3, guided by midwives, health visitors and doctors. Engineering focus on what it won’t say. With a newborn in the house, a confident wrong answer is the only failure that counts.

  3. WORK.03

    Local authority EV car club

    Technical delivery for a council-backed scheme, from procurement through to vehicles live. Specifying what the authority actually needed, evaluating suppliers against it, and making the platform, the vehicles and the charging behave as one service to a resident.

POLICY.Conflicts

I’m currently engaged with businesses in shared mobility and HealthTech. I don’t take due diligence engagements in either.

NEXT.Get in touch

If any of that is your problem, book a call.

Thirty minutes, no pitch. I reply within one working day.

Book a callI reply within one working day.