Fractional CTO · Technology Advisory · Technical Due Diligence

Your next technical leader — without the full-time hire.

I help owners and boards of small and mid-sized companies make confident technology decisions: architecture that scales, security and compliance your auditors can verify, teams that ship, and an AI strategy that pays for itself. Twenty-five years building systems — twelve leading teams — from fifteen-person startups to a 100+ person engineering organization.

25+
years shipping production systems
60
engineers led & mentored
$20M
annual engineering budget owned
80%
cloud cost reduction delivered

The problem you're trying to solve

You've outgrown your stack

Spreadsheets, shared drives, and a pile of SaaS tools stitched together are quietly capping your growth. You need an architecture and roadmap a board can fund.

You can't hire a full-time CTO yet

A $250K+ hire is too expensive and too risky before you know what the role should do. You need senior judgment 10–20 hours a month, not a résumé.

You're the technical founder

You built the product; now you need a peer to pressure-test architecture, security, and hiring plan before you bet payroll on it.

How companies work with me

1Fractional CTO

Standing technical leadership: architecture and security roadmap, vendor and cloud strategy, hiring plan and interview loops, interim leadership while you recruit the permanent hire, board-ready reporting. Typically 10–20 hours a month.

2Technical due diligence

Independent review before an acquisition, funding round, or major platform bet: what you actually own, what it costs to run, and what breaks at 10× scale. Fixed fee, written report.

3Build & launch

0→1 delivery: team structure, tech stack, CI/CD, observability, disaster recovery and compliance evidence — plus the first hires, hired well.

Meet your fractional CTO

Twenty-five years of shipping production systems — plus twelve years leading and hiring the teams that run them. I was the CTO of a six-country fintech before "fractional" was a title, so the advice comes from owning the budget line, not advising it.

  • Wore the CTO seat: architecture reviews, security reviews, hiring loops, board decks.
  • Now the technical peer for owners and boards of small and mid-sized companies.
  • M.S. + B.S. Computer Science, USC — still comfortable in the terminal.
Portrait photo of Mars Depinski
Mars Depinski — Fractional CTO & Technology Advisor, Miami, FL. More about Mars →

Proof, not promises

  • Built a 20-person multi-national engineering org for a fintech — two redundant OpenStack data centers, 500+ users across 6 countries.
  • Led payments and rewards platforms serving millions of members; drove an SRE culture that measurably improved SLA/SLO attainment.
  • Migrated a company from AWS/Heroku to GCP: −80% infrastructure cost, higher performance.
  • Cut page load from 7s to 2s; lifted ad revenue over 40% with a real-time bidding system.
  • Ran security and usability audits for banking and financial systems.

Nine areas of expertise

Security · Architecture · AI Strategy · Performance · Infrastructure · Disaster Recovery · Compliance · Team Building · O&M of custom systems

Every engagement is scoped around your business risk, not my résumé. You get decisions, documented — with trade-offs a board can read.

Also on this site

  • Expertise — what I deliver per engagement area
  • Experience — technical and management track record
  • About — background and approach
  • Contact — calendar, email, QR business card
  • Blog — notes on fractional CTO work: architecture, security, compliance, AI strategy