Tomek Grzechowski
Fractional CTO · Principal Engineer · Trusted Strategic Advisor
CTO-level execution for products that must ship

25 years of software engineering — distilled into clarity, delivery, and reliability.

I work with founders and teams as a fractional CTO and principal engineer. I sold my first production software 3 decades ago; for the past 25+ years I’ve been building, modernizing, and operating complex systems across multiple markets and technology cycles.

  • CTO advisory: prioritization, hiring, org design, execution cadence, and risk control.
  • SaaS MVPs, platform scaling, and “get it stable” rescue work (architecture + delivery).
  • Legacy modernization: monoliths → modular, cloud-ready, observable systems.
  • Code review at scale: PR standards, maintainability upgrades, security-focused feedback loops.
  • QA and release confidence: test strategy, automation, CI gates, and reliable rollout/rollback.
  • Refactoring programs: roadmap, safe incremental steps, plus automation (codemods, linters, formatters, migration scripts).

When to bring me in

Not another developer. Not a slide-only advisor. Senior technical ownership that can inspect code, architecture, process, and risk — and then act on it.

Production is unstable

Incidents, fragile deploys, single-operator dependency, things that break at the worst time. You need stability to become a feature, not a hope.

Delivery is stuck

The roadmap stopped moving, releases slip, and nobody can say why. You need delivery triage, a risk map, and a credible plan to ship.

CTO gap

You need CTO-level decisions — priorities, architecture, hiring bar, cadence — without the cost and commitment of a full-time hire yet.

Legacy modernization

An older PHP/Laravel/Symfony/Node platform still earns money but blocks the business. You need modernization in stages, not a risky big-bang rewrite.

Technical due diligence

Before fundraising, an acquisition, or a big bet, you need a decision-grade read on the codebase, architecture, risk, and real cost to fix.

Rescue before launch

A project is drifting toward a deadline it will miss. You need someone to take ownership fast, cut scope sensibly, and get it across the line.

What I deliver

Executive-level clarity with engineering-grade implementation detail — so the plan survives contact with reality.

Fractional CTO & Execution & Alignment

Bring focus to complex initiatives and remove ambiguity across product, engineering, and operations.

  • Prioritization, roadmaps, and delivery cadence
  • Hiring strategy, team structure, and “bar raising”
  • Risk management, stakeholder comms, and decision logs

Architecture · Modernization · Rescue

Transform legacy codebases into systems that can be shipped and operated with confidence.

  • Architecture reviews, refactor strategy, and migration plans
  • Monolith & microservice patterns (pragmatically applied)
  • Performance, cost, and maintainability optimization

Reliability · DevOps · SRE Strategy

Stability is a product feature. I help teams operationalize it without bureaucracy.

  • CI/CD, environments, and release safety (rollbacks, flags)
  • Observability, incident response, and operational runbooks
  • Security hygiene (secrets, access, audit trails)

Core technologies

Grouped by the problem they solve — chosen for business risk, maintainability, team capability, and time-to-market, not fashion.

Backend & platform
PHP · Laravel · Symfony Node.js · NestJS · Express MySQL · PostgreSQL · Redis REST · GraphQL · microservices
Frontend & product
Vue · Nuxt React · Next.js Angular TypeScript · Tailwind
Infrastructure & reliability
Docker · Kubernetes AWS · OVH · Azure CI/CD · GitHub Actions NGINX · Apache · Observability
Integrations & payments
Stripe · payments Shopify · Magento Salesforce · Zoho CRM RabbitMQ · SendGrid · Zapier
Data, AI & blockchain
AI-assisted delivery (LLMs · agentic coding) Elasticsearch · data pipelines Ethereum · Foundry Static analysis (PHPStan · Deptrac)
Methodology, practices & coaching
Design patterns · OOP Refactoring · code review Unit testing · CI gates Event-driven · solution architecture Technical leadership · mentoring Hiring bar · interviewing

For sensitive or regulated contexts: secure configuration, credential hygiene, auditability, and operational guardrails are part of the deliverable — not an afterthought.

Example engagement options

Several ways to start — from a paid diagnostic or a fast MVP to a multi-stage modernization program. Scope and fee are set after a short discovery call.

P01 1–3 weeks

CTO Diagnostic / Technical Due Diligence

For: Founders, investors, and leaders who need to know what is really blocking delivery.

Outcome: Risk map, top priorities, architecture & process findings, and a staged next-step plan (P0/P1/P2).

First step: 30-min triage call

Inquire about P01
P02 2–6 weeks

Stabilization / Rescue Sprint

For: Teams with production instability, a stuck release, or legacy nobody wants to touch.

Outcome: A stabilized system, rollout/rollback plan, technical guardrails, and an ordered P0/P1 backlog.

First step: Diagnostic (P01) or triage call

Inquire about P02
P03 3–12 months · 1–4 days/week

Fractional CTO Retainer

For: Companies that need CTO-level ownership without a full-time hire.

Outcome: Decision cadence, priorities, architecture, hiring bar, delivery oversight, and risk control.

First step: Discovery call

Inquire about P03
P04 3–24 months · after a diagnostic

Architecture & Modernization Program

For: Companies with technical debt and a system that still has to earn while it changes.

Outcome: Staged modernization — no rewrite fantasies — with risk control and business continuity.

First step: Diagnostic (P01) first

Inquire about P04
P05 1–3 months

RAPID MVP Delivery

For: Founders who need a real product in market fast — built with production discipline, not a throwaway prototype.

Outcome: A shipped MVP with clean foundations, sensible scope, and a clean handover — ready to iterate, not rebuild.

First step: 30-min triage call

Inquire about P05
P06 ongoing · monthly

Code Review & Quality Program

For: Teams shipping fast that want a senior safety net on quality, maintainability, and security — without slowing down.

Outcome: PR standards, maintainability upgrades, static-analysis gates, and a security-focused review loop.

First step: Short call to scope cadence

Inquire about P06

Engagements typically start from a paid diagnostic or a monthly retainer. Final scope, timeline, and fee are confirmed after a short discovery call — the diagnostic (P01) is usually the best first step.

Selected engagements

Anonymized, with the pattern that matters: context → risk → action → outcome. Names withheld; references available on request.

Technical due diligence · PE-backed SaaS

Decision-grade acquisition due diligence

Context
An acquirer needed an executive-level read on a production SaaS before committing — codebase, infrastructure, and operational risk.
Risk
Single-operator dependency, undocumented deploy steps, fragile environments, and an unclear database-vs-application bottleneck made the true cost of ownership impossible to estimate.
Action
Ran static-analysis hotspot ranking with tunable risk scoring, isolated DB vs app-tier bottlenecks with evidence-based tests, produced architecture (UML), a global engineering rate/cost model, and a staged P0/P1/P2 program with acceptance criteria.
Outcome
A decision-grade acquisition pack: quantified refactor risk, a “no-regret” stabilization path, and defensible estimates for staffing and sequencing post-takeover.
Rescue & modernization · Member portal

From broken prototype to a stable platform

Context
A legacy portal on Symfony 3 plus a separate, broken prototype were blocking the organization.
Risk
Too many missing dependencies to upgrade in place; a messy prototype database (107 tables) and unclear architecture made it unmaintainable.
Action
Chose a clean rebuild on Symfony 7 over a fragile in-place upgrade; rebuilt the prototype into two clean projects (React UI + Node.js API), cut the DB from 107 to 16 tables, and added Docker, TypeScript, validation, and modern UX.
Outcome
A stable, maintainable full-stack platform. Client: “exceptional work… I would not hesitate to reach out to you again.”
Legacy + security · Healthcare / higher-ed (US)

Sequential legacy upgrade, shipped on deadline

Context
A CakePHP 3 system acquired from another institution had security issues and required functional changes by a fixed deadline.
Risk
Security gaps across PHP, the framework, and app code — combined with a hard deadline and a multi-step upgrade path.
Action
Built a multi-architecture Docker setup to test every upgrade branch in parallel; upgraded CakePHP 3 → 4 → 5, refactored auth, fixed all identified security issues, and implemented the requested changes.
Outcome
Published on the agreed deadline with all fixes in place; multiple written client references later shared on LinkedIn.

More engagements

Enterprise eCommerce / tooling

Zend PHP 5 → 7 migration with a safety net

Migrated a Zend Framework service system from PHP 5 to 7 using custom tests and code review, and safely modified a multi-technology eCommerce system (Zend, Go) without breaking functionality.

Streaming SaaS · Performing artists

Full streaming MVP with ticketing

Designed and built (100%) an SPA with admin/artist/user roles: artists plan and stream events and sell tickets; admins review applications and billing; users buy tickets and request custom streams.

Edtech SaaS · Exam prep

Multi-role learning & commerce platform

Built the first version (100%) of a law-exam prep SaaS: admin/editor/user roles, sellable study packages, exam tests, and repetition-based learning aids — then handed it to an internal team.

Private-aviation booking

Flight management + CRM lead-gen integration

Built and later improved technology to manage content, planes, routes, and private-jet flights (including empty legs), and owned the Salesforce/CRM lead-generation integration while leading the team.

Adtech · blockchain ad server

Dev-environment & framework modernization

Built Bash/Docker scripts so the team could spin up a full local environment with zero Docker knowledge, and initiated the ad-server migration from Symfony to Laravel with an Angular UI cleanup.

SaaS survey platform · CTO & co-owner

A framework that scaled to 300+ apps

As CTO and co-owner, built a customized application framework that scaled the product to 300+ configured apps, designed an expertise-based sales/customization delivery process, and sold customizations to enterprise customers including LinkedIn and Dropbox.

Earlier work also includes mission-critical systems, deployments, and integrations for business continuity — including systems for IATA.

Testimonials

“Tomek joined us midway through a development project that was struggling to make progress. He knew the right questions to ask to integrate himself into the project and acquire the proper access and tools needed to work effectively. Within just a matter of weeks, he had taken ownership of development activities and almost single-handedly gotten the project back on track...”

Kyle Jacobsen
Business Analyst, Des Moines University

“Tomasz is a fantastic person to work with, and is not only a multi-skilled and insightful colleague, but also an inspiring strategist. Great engineer with very strong problem solving skills. With Tomasz, every problem has a solution.”

Jose Ferreiro
Chief Technology Officer, LunaJets

“With Tomasz in the team there is no technical issue that can not be resolved. As a leader he is resolving any personal conflicts easily, but his biggest differentiator is keeping work quality at the top level. Working with Tomasz is always inspirational and instructive.”

Piotr Kulas
Co-founder, SurveyLab

“I've worked for Tomasz on several projects and worked with him on several others when he was a team leader. Tomasz presents great management and coaching skills — not to mention technical experience. If I ever need a job or a partner for my own project, I'll ask Tomasz first.”

Maciej Świętochowski
Software Developer · SRE · DevOps

“... Within just a matter of weeks, he had taken ownership of development activities and almost single-handedly gotten the project back on track. He brought a wealth of knowledge and best practices to our implementation and frequently shared his insights on how and why he was making certain decisions. Though our partnership was short, Tomek was able to put us in a very favorable position and make our stakeholders happy. I wish him the best of luck in his future engagements.”

Kyle Jacobsen
Business Analyst, Des Moines University

“I would like to thank you for your dedication and exceptional work on this project. You have truly made working on this project easy and I would not hesitate to reach out to you again for any future projects.”

Alex Cresswell
Mind's Eye Society

“I've worked with Tomasz for over a year and I have to say he is always able to explain options and direct towards one ultimate solution. He's a good team leader, mentor and experienced software developer that is willing and able to share his knowledge.”

Artur Giera
Co-founder & Senior Application Engineer, SurveyLab

“Tomasz and his team deliver quality code in time. He understands our problem and proposes solutions to solve it. It's always a pleasure to work with him.”

Olivier Jaillet
Head of Information Technology, LunaJets

“I worked with Tomek on a complex software development project recently. He was always timely with updates about the work he was doing, and did a great job with writing tests and documentation. I definitely recommend him for any software development project!”

James Bartlett
Senior Business Intelligence Analyst, Des Moines University

“While working with Tomek I was fascinated not only his technical expertise and knowledge, but by his excellent communication and leadership skills as well. Tomek was always there when help or advice was needed — swift and friendly, professional and efficient.”

Balys Narbutas
Creative Project Executive, Fabula Rud Pedersen Group

“I appreciate Tomasz for being not only great in analytics which he is but first of all for being very intuitive. He does not count time when helping others and he takes real interest in other people talents and their growth. With Tomasz leading the team people believe they can achieve anything and what is most important Tomasz is open for other people ideas, appreciates these ideas and praises them.”

Rafał Rząca
CEO, Sonic Smell

“I have worked with Tomasz on several projects and it was fun, pleasure and hard work at the same time. Tomasz is a team player, a lead engineer focused on sharing knowledge and growing the team — and he understands what is really important in building quality software.”

Daniel Markiewicz
Software Engineer

“I’ve worked with Tomasz for almost a year. It was a great experience. He is oriented on solving problems, and thanks to his knowledge he was always able to solve all issues. Tomasz also has a good contact with the team, which can always rely on his support.”

Agata Janczak
Digital Project Manager, Hill+Knowlton Strategies Poland

Contact

If you’re building something serious (or something broke in production), reach out. I respond fastest via email+SMS or phone.

Send project context

I respond fastest to specific context. One paragraph is enough.

Let's talk

Share your context and constraints (deadline, budget range, current stack, top risks). I’ll reply with a quick triage plan.

Based in Kielce, Poland (Europe/Warsaw). Working globally · remote-first.

Fast context (for first message)

  • What are you building (1–2 sentences)?
  • What’s currently blocking delivery or stability?
  • Target timeline and non-negotiables
  • Team size, stack, and deployment environment
  • If you already know the engagement option, mention the package ID (P01–P06).

If you prefer a marketplace engagement, I’m a vetted Toptal expert — ranked #1 Most Reliable Professional Services Company in America (Newsweek & Statista, 2026).