Startups × Warsaw
Best AI Agencies for Startups in Warsaw (September 2026)
Warsaw agencies with verified startup client evidence — ranked by depth of documented work, then editorial quality.
Each listed agency evidences at least 2 documented startup clients. Combined, the agencies below document 23 client engagements.
Ranked agencies for startup clients
Rankings updated · Newest review
Stepwise
#1Warsaw, Poland
Client evidence: 11 documented clients overall · Early-stage
Best for: Early-stage B2B software companies that need a cloud and data engineering team, with AI as one part of the product build.
Warsaw, Poland
Client evidence: 7 documented clients overall · Early-stage
Best for: Data-rich firms and startups with a detection, vision or forecasting problem suited to a research-led team.
Sparkbit
#3Warsaw, Poland
Client evidence: 5 documented clients overall · Early-stage
Best for: Early-stage product companies that need the ML core of their product built, tested and handed over with the IP.
About this list
Startup AI in Warsaw, on this page, runs from research-led machine learning to software houses with AI inside the build, and the published evidence thins in that direction.
Sparkbit publishes model metrics next to the handover: a tower-equipment detector for 5x5 Technologies retrained from F1 0.72 to 0.86, and a posture-analysis core for phy whose algorithms went into the client's FDA application. Its studies also record where work stopped, including a discovery phase whose findings argued against continuing.
QED Software is research-led, founded by Prof. Dominik Ślęzak, and its clearest client evidence sits in named quotes rather than the case studies—DeepSeas' CTO credits models drawn from a contest QED ran with 25% more efficient alert analysis.
Stepwise is a cloud and data engineering team with AI as one part of the product; its one measured model predicted a manufacturer's production-line settings correctly 75% of the time.
The order of questions matters for a startup: decide whether the risk sits in the model or in the product around it, then shortlist the firms whose published work sits on that side.
Intro by Gabor Kiss, curator · How we rank
Expert Insight
Why startup fit matters
Startup budgets buy scoped builds, not programs—the agencies here document work shipped in weeks to months, priced for companies that measure runway.
At small agencies the case-study authors are the delivery team, which removes the seniority lottery that makes large firms risky for small engagements.
Code ownership decides whether the engagement was an asset or a dependency: every documented build here describes a system the client runs, and that question belongs in your first call.
Frequently asked questions
3 agencies in our directory combine verified startup client evidence with a Warsaw base. The current top-ranked are Stepwise, QED Software, Sparkbit — ordered by depth of documented client evidence, then our editorial scoring (portfolio quality, credibility, completeness); placement is never paid.
Published rates across this page's agencies run €45–130 per hour (median ~€108). Project totals depend on scope — the rate index at /rates breaks the computed bands down by region, country and team size.
Each listed agency has at least two documented, named startup clients — published case studies or engagement descriptions our research actually read, with source URLs stored per client. Logo walls without published evidence carry no weight, which is what separates this list from self-declared directories.