Fractional CTO Services for Growing Companies

Fractional CTO and Engineering Advisory

Your company is at the stage where every technical decision has strategic consequences. Which cloud architecture scales to 10x? Should you build or buy the data infrastructure? How do you evaluate a team that's shipping slowly, is it a people problem, a process problem, or a technical debt problem?
These decisions require a CTO-level perspective. If you're not ready to hire a full-time CTO, or you need a second opinion before a major technical investment, we provide fractional CTO services and engineering advisory for growing companies.

See our work

  • Technical strategy, architecture decisions, and build-vs-buy guidance

  • Engineering team assessment, velocity, quality, and organisational gaps

  • CTO coverage during hiring gaps or founder-to-CTO transitions

  • Defined engagement scope, not an open-ended retainer

Recent outcomes

Technical strategy · Post-Series A SaaS

Identified a database architecture flaw before 10x scale, saving an estimated 6-month re-schema project.

6 months saved

Engineering assessment · US logistics platform

Root-caused a delivery slowdown to 3 specific modules with high cyclomatic complexity, not team capability.

40% velocity lift in 8 weeks

Build vs. buy evaluation · UK fintech

Saved $28,000/month in SaaS licensing by switching to a self-hosted observability stack at 60+ hosts.

$28K/month saved
4.9 / 5 on ClutchSee all work

Recognition

Sound familiar?

  • Making major architectural decisions without a senior technical voice in the room?

  • Engineering team shipping slowly and you're not sure whether it's talent, process, or codebase?

The short answer

RaftLabs provides fractional CTO services for companies in the US, UK, and Australia. Engagements start with a 2-3 week diagnostic and fixed-scope findings report. 100+ products shipped since 2015. No open-ended retainers.

MVP & Product Development · Updated June 2026

Trusted by

Vodafone
Nike
Microsoft
Cisco
T-Mobile
Aldi
Heineken
GE

Product delivery, by the numbers

products taken from discovery to production
100+
from first call to a written scope and fixed price
30 min
rated by clients on Clutch
4.9/5
years delivering software for established businesses
9+

The decisions that compound

Technical decisions compound. A database schema chosen for MVP simplicity becomes a migration project that costs 6 months of engineering time at scale. A monolithic architecture chosen to ship fast becomes a scaling constraint that adds 3 weeks to every feature. A third-party dependency chosen for speed becomes a vendor lock-in that limits your product options.

These decisions don't announce themselves as consequential. They look like small architectural choices at the time. A fractional CTO's job is to identify which decisions are load-bearing before they're made, not after they've caused the expensive problem.

Capabilities

What we advise on

Technology strategy and roadmap

Translating your business model and growth trajectory into a working 12-18 month roadmap your engineering team can execute from and your board can scrutinise, not a slide deck of principles. We start with the business context, then map the architectural decisions that determine whether you can support the trajectory. Each initiative is scored on business impact, reversibility, and technical debt cost, so high-impact, hard-to-reverse decisions come first. The strategy states when each decision should be revisited, so reviews happen at planned inflection points, not in a crisis.

Architecture review and guidance

Reviewing major architectural decisions before they're made and before they're expensive to reverse: database and data model design, API contracts, service decomposition, and infrastructure choices. The decisions that matter most feel small at the time, like a schema chosen for MVP simplicity. Every reviewed decision produces an Architecture Decision Record documenting the options, trade-offs, recommendation, and the conditions for revisiting it. ADRs live in the Git repository alongside the code, so context survives without institutional memory. Security architecture review is included where relevant.

Engineering team assessment

Structured assessment of your engineering organisation's delivery capability when you suspect a problem but can't diagnose its root cause. Over 2-3 weeks, we combine static codebase analysis with tools like SonarQube, git history metrics, incident review, and 1:1 sessions with engineers and leads. Slow delivery usually traces to one of five root causes, from concentrated technical debt to unclear ownership, and we identify yours with evidence, not intuition. The output is a findings report with a prioritised, sequenced remediation plan.

Build vs. buy evaluation

Objective evaluation of specific build-vs-buy decisions with a total cost of ownership model that makes the trade-off quantitative, not intuitive. We weigh integration cost, recurring fees at projected volume, build effort, operational burden, and vendor risk. Common categories: identity and authentication, search, observability, and AI infrastructure. The output is a decision document with the TCO at 12 and 36 months, the key assumptions, the recommendation, and the conditions under which it would flip. The answer is not always "buy", but it is defensible to your board.

Technical due diligence

Technical due diligence for investment and acquisition decisions: structured evaluation of a target company's technical assets and liabilities, framed as risk an investor can act on, not code quality scores that need a CTO to interpret. In 5-10 business days we assess codebase quality, architecture, infrastructure, security posture, technical debt, and key-person risk. Each issue is classified by severity and remediation cost. The report is written for non-technical board members, with a one-page traffic light summary and the estimated impact on transaction value.

Interim CTO coverage

CTO coverage during leadership transitions: between a departing CTO and a permanent hire, during a founder's move to commercial leadership, or while evaluating an internal promotion. Without cover, decisions that need CTO-level authority accumulate and the team stalls. Coverage includes weekly architecture reviews with decision authority, monthly board-level technical briefings, quarterly engineering health reviews, and day-to-day availability via Slack. The engagement is designed to transfer cleanly: decision logs, a 12-month roadmap, team assessments, and vendor context hand over to the permanent hire.

How we work

From diagnostic to decision

Every engagement starts with a fixed scope. You know the cost before any work begins.

  1. Weeks 1-3
    01

    Discovery and diagnostic

    We assess your current architecture, engineering processes, team structure, and technical roadmap. You get a structured findings report and a set of prioritised recommendations. No work proceeds without your sign-off on scope and cost.

  2. Weeks 4-8
    02

    Advisory sessions and decision support

    Weekly attendance at architecture reviews and key decisions. We produce Architecture Decision Records for every major call so context is preserved for future hires. Every recommendation comes with the trade-off calculation, not just the conclusion.

  3. Weeks 8-12
    03

    Remediation planning and roadmap

    We turn findings into a sequenced action plan with effort estimates and expected outcome per item. The highest-leverage problems go first. You end this phase with a 12-month technical roadmap your engineering team can execute from.

  4. Week 12+
    04

    Transition and handover

    The engagement is designed to end cleanly. Context documentation, architecture decision logs, vendor contacts, and team assessments transfer to whoever leads next. No perpetual dependency.

Why us

Why teams choose RaftLabs

  1. Senior engineers advise and build

    The engineers who assess your problem are the same people who have built 100+ products across healthcare, fintech, logistics, and SaaS. No junior analysts writing up what a senior told them. The person in the room has shipped at scale.

  2. Fixed scope before any work starts

    We scope the engagement, calculate the cost, and lock it in writing before work begins. A scope change is a change request: priced, agreed, or dropped. It never absorbs into the project and appears on the final invoice.

  3. 9 years and 100+ products shipped

    Clients include Vodafone, T-Mobile, Aldi, Nike, Cisco, and Lockheed Martin. Track record across AI, SaaS, mobile, automation, and enterprise platforms in healthcare, fintech, logistics, and hospitality.

  4. Compliance built in from day one

    GDPR, HIPAA, SOC 2 — compliance requirements are scoped in week 1, not retrofitted before launch. We have shipped HIPAA-compliant systems for US healthcare clients and GDPR-compliant products for European markets.

What technical decision do you need a second opinion on?

Tell us the context. We'll structure the right engagement to give you the answer.

Talk to a founder

Related services

Fractional CTO and Engineering Advisory, scoped in one call.

Tell us what's broken. Within one business day you get a straight take on cost, timeline, and the right first step. No deck, no pressure.

Frequently asked questions

A fractional CTO provides the technical leadership and strategic input a full-time CTO would provide, for a defined number of days per week or month. This includes technology strategy and roadmap decisions, architecture review and guidance on major technical choices, engineering team assessment and hiring criteria, vendor and technology evaluation, investor and board technical communications, and acting as the senior technical voice in product and business discussions. The scope is defined upfront, it's not an open-ended advisory relationship.

Fractional CTO is most valuable for: post-Series A or Series B companies that have a product and engineering team but no CTO; founder-led technical teams where the technical founder needs a strategic partner to pressure-test decisions; companies in a CTO transition (between CTOs or promoting an engineering manager into the role); and companies facing a major technical inflection point, a re-architecture, a platform migration, or a significant scaling challenge, that needs senior technical oversight.

Engineering advisory is a narrower engagement, typically a specific technical question, an architecture review, or an assessment of an engineering team or codebase. Fractional CTO is an ongoing engagement where we become part of your leadership team for a defined period. Advisory is appropriate when you have a specific decision to make. Fractional CTO is appropriate when you need continuous technical leadership.

We start with a fixed-scope diagnostic, 2–3 weeks assessing your current architecture, engineering processes, team structure, and technical roadmap. You get a structured findings report and a set of prioritised recommendations. From there, you can continue with an ongoing fractional engagement or use the advisory output to hire or promote internally. We design every engagement with a defined end state, not perpetual dependency.

Yes. Engineering team assessments are one of the most common advisory requests. We evaluate team structure, technical skills, engineering processes, code quality, and delivery patterns. The output is a structured report that identifies the root cause of velocity or quality problems, which is rarely simply "the team isn't good enough." It's usually a combination of unclear ownership, missing processes, technical debt in specific areas, or tooling gaps that we can fix.

Engagements are priced based on scope, not a monthly retainer that grows over time. A fixed-scope diagnostic (2-3 weeks, structured findings report) typically runs between $8,000 and $15,000 depending on codebase size and team complexity. Ongoing fractional engagements are scoped and priced per quarter. We quote a fixed price before any work starts. No surprise invoices.

Work with us

Tell us what you need. We'll tell you what it would take.

We scope Fractional CTO and Engineering Advisory in 30 minutes. You walk away with a clear cost, timeline, and approach. No commitment required.

  • Scope and cost agreed before work starts. No surprises. No obligation.
  • Working prototype within 3 weeks of kickoff.
  • Pay by milestone. You see progress before each invoice.
  • 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
  • All conversations are NDA-protected.

Go deeper

When to hire a fractional CTOWhat does a fractional CTO do?Build vs buy calculatorBrowse our case studies

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