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OpsbyFabian

About, the founder file

Operator first. Builder second.

Why a bookkeeper-turned-builder makes different software, and why that difference matters for your business.

A bright studio workspace with emerald business dashboards on two screens
Fabian Janiszewski, founder of OpsByFabian, in a study lined with bookshelves.

Fabian Janiszewski, founder

Extremadura, España

  • Fabian Janiszewski
  • Extremadura, España

I didn't get into software through software. I got in through the numbers, bookkeeping, financial operations, the unglamorous work of making a business's reality legible. That desk is an education no bootcamp sells: every broken workflow in a company eventually lands there, disguised as a wrong number, a late invoice, or a client who quietly stopped answering.

Sit there long enough and you stop believing in tool problems. The CRM wasn't bad, nobody opened it. The spreadsheet wasn't wrong, it was asked to be a database, a process, and a memory at once. The leads weren't weak, nobody followed up on Tuesday. What's missing in most businesses isn't another subscription. It's a system: a deliberate shape for how work moves from 'someone should' to 'done'.

So I started building. First small tools for the problems in front of me. Then FollowUpOS, because I watched good leads die of silence and refused to accept that as normal. Then DealSharp, because I'd seen real estate decisions made on envelope math that wouldn't survive a stress test. Each product taught me the same lesson from a new angle: the gap between a messy process and working software is smaller than people think, if the builder understands the process.

OpsByFabian is that lesson, turned into a studio. I build AI workflows, dashboards, internal tools, and MVPs for founders and operators, from Spain, in three languages, with the operator's eye for whether a thing will actually get used. AI is everywhere in my work, but as leverage: it removes repeated work. It doesn't replace judgment, and I won't pretend otherwise to win a project.

I'm a Polish founder living in Spain. A husband and a father. I've built my life the way I build systems, deliberately, from a small place, with global ambition. If your business has a workflow that keeps leaking and a nagging sense that 'there should be a system for this'there probably should. I'd like to build it.

Fabian Janiszewski, founder of OpsByFabian

The route so far

  1. 01Origin

    Bookkeeping & financial clarity

    Learning where businesses actually break: in the numbers that workflows leave behind.

  2. 02Then

    Business operations & client systems

    Running follow-up, reporting, and delivery, the processes, not just the records.

  3. 03The turn

    First internal tools

    The spreadsheets hit their limits. Building started.

  4. 04Product

    FollowUpOS

    The follow-up leak, productized into a SaaS.

  5. 05Product

    DealSharp

    Real estate finance experience, turned into an analysis platform.

  6. 06Now

    OpsByFabian

    The studio: building these systems for founders and operators, globally.

The operating system

Principles I build by

  1. 01

    Build systems people actually use.

    Adoption is the metric. A perfect system nobody opens is an expensive decoration.

  2. 02

    Fix the workflow before adding features.

    Features on top of a broken process just make the chaos faster.

  3. 03

    Clarity beats complexity.

    If the team can't explain the system, the system doesn't exist.

  4. 04

    AI should remove repeated work, not fake expertise.

    Leverage, not theater. The boring AI that runs daily beats the impressive demo that runs once.

  5. 05

    Every messy process eventually becomes messy numbers.

    I learned this at the bookkeeping desk. It's still the most reliable law of operations I know.

  6. 06

    A website should move people into action.

    Looking good is table stakes. Converting attention into workflow is the job.

  7. 07

    Software should feel like leverage, not another job.

    If the system creates more admin than it removes, it failed, regardless of how it demos.

Off the clock

Home base is Spain; the passport is Polish; the work happens wherever clients are, US, UK, Europe, LatAm. I work in English, Spanish, and Polish, which means projects don't lose nuance in translation, and neither do the people in them.

The rest of life is family and movement: a husband and father who builds from a small place on purpose, travels when possible, and believes the best systems, in business and otherwise, are the ones that quietly hold everything together.

  • Polish founder in Spain
  • Husband & father
  • Traveler & builder
  • EN · ES · PL
WARSAWSPAIN, HOME BASEUK & EUUS & CANADALATAM
Warsaw → Spain → wherever your business runs.

Now you know who's building. Let's look at your workflow.