I help founders build products that raise rounds and teams that ship.

Fractional CTO & engineering advisor for startups.
I'm hands-on, accountable, and embedded.

20+ years in engineering · 50+ engineers managed · $75M+ raised

Maciek Wasilewski

Is this for you?

The best engagements come from strong fit. A bit of honesty here will save us both time.

This is for you if…

  • Pre-seed to Series B founders who need senior technical thinking
  • Non-technical founders building their first product or team
  • Startups scaling past their first customers and wrestling with architecture, hiring, or process
  • Companies preparing for a fundraise and needing investor-ready tech
  • Teams where the founding engineer is maxed out and needs a sparring partner

This is NOT for you if…

  • 2–4 week delivery-only engagements
  • Teams that want someone to "just build this feature" without context or ownership
  • Teams not open to changing how they work
  • Founders looking for the cheapest option, not the right one

Most engagements are project-based, monthly retainers, or ongoing advisory relationships.

Why typical options don't work for founders

You've probably already considered the usual routes. Here's where they break down.

Agency

  • -Optimizes for velocity, not your business outcomes
  • -Hands off code and disappears when accountability matters
  • -Expensive and misaligned on what 'done' means

Full-time CTO hire

  • -$200–400K fully-loaded before you know PMF
  • -3–6 month hiring process you don't have
  • -Equity dilution and real culture risk if it's the wrong person

Freelance contractor

  • -Executes tasks, doesn't own outcomes
  • -There's no strategic layer; you're just renting a pair of hands
  • -Leaves when contract ends, taking context with them

What working with me looks like instead

Embedded, not external

I join your standups, Slack, and planning sessions. I'm a part of the team - not a vendor on the side.

Accountable for outcomes

I stay long enough to live with my own decisions. I don't do hit-and-run architecture.

Hands-on when it matters

I can review architecture and advise, or I can open a PR. Most engagements involve both.

Honest over comfortable

I'll tell you when the plan is wrong, when the hire is a mistake, or when you're solving the wrong problem.

Outcomes

Specific metrics are better proof than big claims.

22M+users

MEWE - GLOBAL SOCIAL NETWORK

Challenge: Build a privacy-first social network from zero into a product used across 200+ countries.

What changed: Joined as first engineer, led frontend, iOS, Android and eventually the full engineering org of ~50 across backend, mobile, web and infra.

Scaled MeWe to 22M+ registered users while staying independent from surveillance-driven ad revenue.

1.4Musers migrated

MEWE - WEB2 → WEB3

Challenge: Move a live social platform onto Frequency / Polkadot without forcing crypto complexity onto everyday users.

What changed: Architected the migration and designed a zero-friction path that preserved the core social experience.

Delivered the largest Web2 → Web3 user migration in history with no UX regression.

500K+wallets in 2 weeks

MEWE - AVALANCHE LAUNCH

Challenge: Ship embedded digital wallets at social-network scale without seed phrases or assumed crypto knowledge.

What changed: Partnered with Avalanche and built wallet provisioning directly into the signup and account experience.

Created 500K+ wallets in two weeks and opened embedded wallets to 22M+ users.

Ready to talk?

Book a 45-minute call. We'll talk through what you need, whether that's hands-on development, technical leadership, or strategic advice, and I'll tell you upfront if I'm not the right fit.

Book a Call

Usually responds within 1 business day.

Frequently asked questions

Questions founders usually ask before reaching out.