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Senior technical advisory

We help you make the right technology decisions

Technical due diligence, architecture and systems review, and fractional CTO engagements — from a senior, independent team.

We don't replace your team. We sharpen its judgment — read-only review, written recommendations, and ongoing counsel you can act on.

Book an intro What we do

Who we are

A small, senior team that advises founders and leadership — not an agency that hands you a deck and disappears.

Senior by default

The people who scope the review are the people who read your system. No layered handoffs, no juniors learning on your dime.

Independent

We advise; we don't sell you a build. No incentive to recommend work that conveniently lines our pockets.

Pragmatic

Findings you can actually act on, prioritized by risk and effort — not a checklist that looks thorough and goes nowhere.

What we do

Three advisory engagements, each with a clear question it answers.

Technical due diligence

Pre-investment or pre-acquisition review — what you're actually buying.

  • Architecture, code, and infra assessment
  • Security, scalability, and tech-debt review
  • Team capability and key-person risk
  • Written findings for the deal team

Architecture & systems review

For operating teams: where's the risk, and what do you fix first.

  • Read-only review of systems and practices
  • Risk and reliability assessment
  • Build-vs-buy and vendor decisions
  • Prioritized, written recommendations

Fractional CTO / leadership

Ongoing senior counsel when you don't need a full-time hire yet.

  • Roadmaps, hiring, and vendor steering
  • Engineering process and delivery oversight
  • Board and investor reporting
  • Coaching for technical founders and leads

How we work

A transparent, read-first loop. You always know what we found and what we'd do next.

1

Scope

We define the question, the stakeholders, and what "done" looks like — before any review starts. You get a clear plan and a fixed price.

2

Review

Read-only, pragmatic: we read your system, code, infra, and talk to your team. No changes, no surprises, no theatre.

3

Report

A written report with findings prioritized by risk and effort. Decisions and tradeoffs documented, not buried in a slide deck.

4

Advise

We brief your team and stay available — as a fractional CTO, a recurring review, or a clean hand-off to delivery. Your call.

The background we advise from

We've shipped in these stacks for years — which is why we can read yours quickly and tell you what matters.

Swift Kotlin TypeScript Go React React Native Node.js PostgreSQL AWS Cloudflare

Delivery is available as a follow-on where it makes sense — separately scoped, with a clean separation from any advisory work. Advisory always comes first.

Frequently asked

Short answers to the most common questions.

What does an engagement look like?
It starts with a short scoping call to define the question and stakeholders. Reviews are fixed-scope with a set price and timeline; fractional CTO work runs on a monthly retainer. You always know what you're getting before we begin.
Is the review read-only?
Yes. We read your system, code, and infrastructure, and we talk to your team — but we don't make changes. Findings and recommendations are delivered in writing. If you want help acting on them, that's a separate, cleanly-scoped conversation.
How long does a review take?
Most due diligence and architecture reviews run two to four weeks from kickoff to written report — faster for a focused scope, longer where the system is large or access is gated. Fractional CTO engagements are ongoing, typically with a weekly cadence.
Do you take on delivery after advising?
Sometimes, where it makes sense and there's no conflict. Advisory always comes first, on its own terms — never as a loss-leader for a build. If we move into delivery, it's a separate engagement with its own scope, price, and clean separation from the review.
Do you sign NDAs and handle conflicts of interest?
Yes to NDAs — standard before any review. We won't advise on direct competitors in the same market at the same time, and we'll flag any potential conflict before scoping so you can decide.
How does pricing work?
Fixed-scope reviews are priced per engagement based on system size and depth; fractional CTO work runs on a monthly retainer tied to time commitment. Reviews typically fall in the $15–40k range, and fractional retainers start around $8k/month. We give you a concrete number during scoping, not a vague estimate.
Where are you based, and do you work remotely?
We're a remote-first team and have advised clients across Europe, North America, and South America. Async-first, with scheduled calls when they earn their place — no mandatory sync standups, no travel billed as a matter of course.

Want a second opinion you can trust?

Tell us what you're weighing. We'll reply within a couple of days — no sales calls, no pushy follow-ups.

Book an intro hello@sixlab.co