I checked 75 companies with an office in Kraków that show React work in at least one source (69 by their Clutch profile, 7 by their open roles on JustJoin.it, 3 by my Wrocław catalog) against the court register, their latest filing and their employee reviews. 28 meet the ranking criteria, and the 10 highest scores are below. If one senior engineer is enough, I build React apps with AI agents.
In short: The highest-scoring React software houses in Kraków for 2027 are korg.software (score 80), Alergeek Ventures (score 79) and Software Mansion (score 78). The 0 to 100 score combines court register data, the latest financial statement, Clutch client reviews, GoWork employee reviews and open roles on the job boards. Paid Clutch positions do not count.
korg.softwareA small service business that needs a custom web app, like quote automation, built by a small team. React is 50% of the technology focus on its Clutch profile. Score 80, 5.0 on Clutch from 10 reviews, profit in 2025.
Alergeek VenturesEarly-stage startup that needs a small Kraków team for a web app, an education platform or a media product. React is 50% of the technology focus on its Clutch profile. Score 79, 4.9 on Clutch from 6 reviews, profit in 2025.
Software MansionMedia or consumer app company that needs senior React Native work, from performance fixes to a new app. React is 15% of the technology focus on its Clutch profile. 3 open roles with React in the requirements. Score 78, 4.8 on Clutch from 24 reviews, profit in 2025.
iTeamlyProduct companies that want Java, React or .NET engineers to join their own team under their own lead. 4 open roles with React in the requirements. Score 78, 5.0 on Clutch from 7 reviews, profit in 2025.
One senior instead of a teamIf the project fits one person with coding agents, hire me for React apps before you pay an agency margin.
The picks come from the data in the full table, not from who paid. A company enters this list when at least one source shows React work; the share on Clutch is what the company declares.
The order below is the score from five axes: transparency, client reputation, stability, specialization and activity. Here specialization measures how deep the company goes into React (its share of the Clutch profile and of open roles) and weighs 35% instead of 15%, so specialists rank above large generalists. Weights and the full method are on the guide page.
Financial figures come from the latest filing of the Polish company. For subsidiaries of foreign groups they can be far from the size of the real business. Open the sources under each entry before you shortlist.
1
korg.software
Small Kraków software house building custom web apps, websites and SaaS, with a second team in Ełk.
Best for: Early-stage startup that needs a small Kraków team for a web app, an education platform or a media product.
Verdict. Pick Alergeek for an MVP or an early product where you want to work with the founder directly. Skip it for a large program that needs several teams at once.
Pros
Profitable in 2025, with 343K PLN of profit on 1.9M PLN of revenue.
Names its startup clients and links case studies for Legora, Kvantab and INTU.
Clutch shows 4.9 from 6 reviews.
The founder also leads tech at a Y Combinator startup, so the team knows early-stage pace.
Cons
A small company, with 1.9M PLN of revenue in 2025 and 12 people on the team page.
Three listed projects have no case study page and no client name.
The address on its site differs from the one in KRS.
From their website and Clutch profile
The home page shows case studies for Legora, Kvantab and INTU, each with a quote from the client's founder (source).
The founder also lists a technical lead role at Scape.App, a Y Combinator S24 startup (source).
The company details page gives Jana Kantego Federowicza 5/96 in Kraków, while KRS lists Syrokomli 24/10 (source).
Clutch shows 4.9 from 6 reviews, rates of $50–99 per hour and a $10,000 minimum project (source).
Web developmentMobile app development and maintenanceAI and document analysis automationTech stack modernizationInfrastructure and DevOpsProduct workshops and embedded teamsAI
Homepage of alergeek.ventures, screenshot taken October 28, 2026. Content and marks belong to Alergeek Ventures.
3
Software Mansion
Kraków software company for mobile, web and AI, maintaining many React Native open source libraries.
React Native development and consultingMobile app modernizationWeb and Elixir developmentOn-device AI and AI software developmentReal-time video and audioTeam augmentationReactReact NativeJavaScriptPython
Homepage of swmansion.com, screenshot taken October 28, 2026. Content and marks belong to Software Mansion.
4
iTeamly
Kraków engineering partner offering product delivery, team augmentation and technology consulting to international product companies.
Best for: Automotive, navigation and fintech companies that need a large engineering team with domain experience and a budget above 50,000 USD.
Verdict. Pick Intellias for mobility and fintech engineering, where HERE and TomTom are checkable references. The Polish entity delivers for a foreign group, so agree in writing who leads your project.
Pros
The Kraków company reported 152.3M PLN of revenue and a profit of 8.4M PLN in its 2025 filing.
The site names domain clients such as HERE, TomTom and HelloFresh.
Clutch shows 4.9 from 30 reviews, and Intellias has held ISO 27001 since 2017.
Its open roles on the job boards are remote.
Cons
The Polish company belongs to Iteality Limited, and the group was founded in Ukraine in 2002.
Employee reviews are negative on balance (26 positive, 28 negative), with 4 mentions of layoffs.
Three of the four Polish offices are coworking spaces, and the open roles are remote.
From their website and Clutch profile
Intellias was founded in 2002. The about page says its first office outside Ukraine opened in Zurich in 2010 and does not mention Poland (source).
The site lists four Polish offices in Kraków, Warsaw, Łódź and Wrocław, and the last three are in coworking spaces (source).
Named clients include HERE, TomTom, HelloFresh and Zooplus (source).
Best for: A healthcare or fintech company that wants an outsourced team backed by ISO 27001 and ISO 9001.
Verdict. Intetics fits a regulated company that needs certified processes and a large bench. Skip it for a small startup MVP with a 50,000 USD ceiling.
Pros
Holds ISO/IEC 27001, ISO 9001 and ISO/IEC 42001 for AI management.
Has run since 1995 and claims 500+ people across branch offices in 7 countries.
Profitable in 2025, with 1.1M PLN of profit on 25.7M PLN of revenue.
Clutch shows 4.8 from 30 reviews.
Cons
Leans on staffing, and Clutch puts staff augmentation and managed services at 20% each.
Case studies sit behind a registration form, so references take a sales call.
The site names no Polish office, so ask who in Kraków will do the work.
From their website and Clutch profile
The locations page claims 500+ people, branch offices in 7 countries and 400+ clients since 1995. (source)
The certifications page lists ISO/IEC 42001, ISO/IEC 27001 and ISO 9001. (source)
The case studies page hides its list behind a registration form. (source)
The site names no Polish office, though KRS places the Polish company in Kraków. (source)
Custom software developmentRemote in-sourcing (dedicated teams)AI and ML solutionsSoftware product assessment (TETRA)Cloud and DevOpsQA and test automationAI
Homepage of intetics.com, screenshot taken October 28, 2026. Content and marks belong to Intetics.
8
Grape Up
Enterprise cloud, legacy modernization, data platforms and AI engineering for automotive, finance, manufacturing and aviation companies.
Best for: Automotive, finance and aviation enterprises modernizing legacy systems or building a cloud and data platform, with a budget above 50,000 USD.
Verdict. Grape Up is profitable but hard to verify from outside, so ask for named references in your industry before you sign. For a startup MVP it is too big.
Pros
Grape Up reported a profit of 27.1M PLN on 92.3M PLN of revenue in 2025.
Polish funds and the founders' family foundations own the company. Headquarters are in Kraków, with a Wrocław development center.
Grape Up runs its own platforms for legacy modernization and data sharing, such as G.Tx and Databoostr.
Clutch shows a 5.0 rating.
Cons
Clutch shows only 6 reviews, and only one of 25 case studies names the client. Logos such as Porsche come without described work.
GoWork employee reviews are negative (5 positive, 17 negative), with 8 mentions of layoffs, though the latest review is from 2024.
The job boards show very few open roles.
From their website and Clutch profile
Headquarters are in Kraków, and Wrocław is one of two Polish development centers. Grape Up has a Wrocław presence but is not a Wrocław company (source).
24 of 25 case studies are anonymized by sector, and Cummins is the only named client. The homepage logo wall shows image files without text names (source).
The about page claims over 20 years of operation but gives no year. The Polish KRS entry is from 2014, and Clutch lists 2006 (source).
The site shows no ISO or cloud partner certifications, although Grape Up sells sovereign cloud and AI governance products (source).
Clutch shows 5.0 from 6 reviews, a $50,000 minimum project, $50 to $99 per hour and 50 to 249 employees (source).
Best for: Startups and SMBs with a defined web, mobile or AI build that want low rates and accept a team working from Ukraine.
Verdict. Pick DBB Software for a defined web or AI build at low rates, delivered from Ukraine with a Kraków front office. Skip it if you need a team in Poland.
Pros
Clutch shows 34 reviews with a perfect average and a Premier Verified badge.
The Polish company reported a profit of 1.5M PLN on 3.6M PLN of revenue in 2025.
The site dates the start in Dnipro to 2015 and the Kraków office to 2021.
DBB Software declares ISO/IEC 27001 and AWS Select Tier status.
Cons
The Polish company had 3.6M PLN of revenue, while the site claims 100+ engineers, so most delivery likely sits in Ukraine.
The declared rate of 25 to 49 USD is the offshore band, so ask who writes the code.
The registry entity dates only from 2021 and has minimum share capital.
From their website and Clutch profile
The timeline says the company was founded in February 2015 in Dnipro, Ukraine, and opened a Kraków office in November 2021 (source).
The timeline's latest headcount is 89 people across Dnipro, Lviv and Kraków in August 2023. The homepage claims 100+ engineers (source).
The site states ISO/IEC 27001 certification in June 2026 and AWS Select Tier status (source).
Clutch lists 34 reviews, a 25 to 49 USD rate band and locations in Kraków and Dnipro (source).
Product discovery and validationProduct design and UXWeb application developmentMVP developmentProcess optimizationSupport for growing products
Homepage of www.lunarlogic.com, screenshot taken October 28, 2026. Content and marks belong to Lunar Logic.
Every company we checked
The table below has the 75 companies with React evidence in Kraków, including the ones that do not qualify for the ranking, with the reason. Sort by any column.
All companies in the data set, with the same score. Companies without a confirmed office, sole traders, body-leasing firms and product companies are listed but not ranked.
Who is not in the top 10, and why
Paid placements and “serves the city” without an office
On the Clutch city list the first positions are bought with ads (links through ppc.clutch.co) or a “serves” entry. These companies have no office in the city according to KRS or their own site, so they are not ranked here.
Memory Squared (paid)
Body leasing, product companies and other services
Renting people into someone else’s team is a different service from delivering a project. A product company, a marketing agency or an SAP partner does not sell software projects either. They are in the full table with a label.
N-iX
Sii Poland · Warsaw
Amsterdam Standard
IVN (formerly Ivision.pl)
Website not confirmed
The website could not be tied to the registered company. Without that I cannot tell whose filing and reviews I am reading, so the company is not ranked.
Clover Dynamics
No financial statement
The Financial Documents Repository holds no full-year statement for this company (a new company or no filings). Without revenue and a result I cannot compare stability, so the company is not ranked.
Busy Rebel
Ranked 11th and below
They qualify but score lower. Their full rows are in the table below; the gap between 10th and 15th is often a few points.
Hatimeria
Tandemite
Gecko Dynamics
Rite NRG · Wrocław
Software Mind
Pragmatic Coders
SKM Group
Core Logic
Codibly
Codya
TechMagic
TechWings
+ 6 more in the full table
Too little client evidence, under 10 people, sole traders
Without 5 Clutch reviews or 2M PLN of revenue in a filing there is no fair way to compare a company with the rest. That is a data gap, not a verdict.
Engipulse
Brilinxoft
Busy Rebel
26bitz
JSON Crew
Weak evidence for React
They meet the data criteria, but the topic rests on a small Clutch share, a few job ads or a single source. They may do it; the data just does not show it.
Halo Lab
Nopio
Montrose Software
xfive
THEY.dev
Spyrosoft Group · Wrocław
Smart Mobile House
The Software House
Jellyfish.tech
Lexogrine
Integrio Systems
Light IT Global
+ 24 more in the full table
What they charge
On Clutch, the companies in this table most often declare 50 to 99 USD an hour. The rate is what the agency bills; the developer on your project is paid less than half of it.
For comparison, my own rate is 36 to 54 USD an hour (45 USD base, pricing). The cost estimator shows what a project like yours costs with and without coding agents.
25-49 USD/h25
50-99 USD/h42
100-149 USD/h4
150-199 USD/h1
Rates declared on Clutch, 72 companies with an office in the city.
Check any agency yourself in 10 minutes
Ask which React version and framework the team ships today and who owns the design system. A team that only lists React next to ten other frameworks usually staffs whoever is free.
Find the legal entity in the National Court Register: the seat, the share capital and the shareholders. An office here with a seat in another city is a sales office, not a team.
Read the last financial statement in the Financial Documents Repository (free, by KRS number): revenue, profit or loss, and whether it was filed on time.
Check the VAT white list: active, and the name matches the contract.
On the Clutch list hover over the company link; a link through ppc.clutch.co is an ad. Then read the reviews themselves.
On GoWork read the employee reviews, not the stars, and look for layoffs and rotation.
Ask who exactly will work on your project, and check those people on LinkedIn.
Get offers from the best-fit agencies
Describe your project, get offers in 24 hours
Tell me what you are building. Within 24 hours on working days you get my own estimate and a shortlist of the best-fit agencies from this ranking with their offers, or my match if they stay silent. No commission, no obligation.
How this works: I write back with my own offer and forward your brief to the agencies that fit, after you agree. As of October 30, 2026 no agency pays me for leads and this page has no affiliate links. If that changes, it will say so here.
Questions
What are the best React software houses in Kraków in 2027?
By the score on this page: 1. korg.software (80), 2. Alergeek Ventures (79), 3. Software Mansion (78), 4. iTeamly (78), 5. Incode Group (76). The score adds up transparency in the court register, client reviews on Clutch, profit and stability in the latest filing, specialization and current hiring. The full table shows every company checked.
How much do React agencies in Kraków charge?
Most companies in this table declare 50 to 99 USD an hour on Clutch. My own rate as a senior engineer working with AI agents is 36 to 54 USD an hour.
How do you know a company does React?
From at least one of three sources: the service, industry and framework shares on the Clutch profile, the skills in open roles on JustJoin.it, or my own Wrocław catalog. Companies with two or three sources score higher on specialization. The software house finder shows the same tags for every company.
Did any company pay to be on this list?
No. There are no paid placements and no affiliate links. The only business interest is mine: I sell senior engineering as the alternative to an agency.
Can I get my company added or corrected?
Yes. Write to ciunkos@gmail.com with the KRS number and the correction.
The company list comes from a full read of the Clutch city listing (every page, with paid positions marked by their ppc.clutch.co links), the ITCORNER cluster, Google results and job ads. Every company was checked in the National Court Register (KRS) for its seat, legal form, capital and shareholders, in rejestr.io and the Financial Documents Repository for revenue and profit from the latest filing, on GoWork for employee sentiment, layoff mentions and review clusters, and on the JustJoin.it and No Fluff Jobs boards for open roles and the stack they actually pay for. The 0 to 100 score is five axes with published weights: transparency, client reputation, stability, specialization, activity. A paid Clutch placement does not raise the score.
Disclosures
Until November 2026 I work at Sanddev (Wrocław) as the founding engineer of its Sandtime product. Sanddev appears in the full table with the same score as everyone else and no editorial favor.
As a contractor I have talked with, or applied to, some of the agencies on these lists. None of them knew about this ranking and none of it changed a score.
No agency pays for a position, there are no affiliate links, and no company has seen its entry before publication. If any of that changes, the disclosure changes first.
My business interest is on every page: I sell senior engineering with AI agents as the alternative to hiring an agency.
Written with AI (Claude) from the data set. Every number in the editorial text is checked automatically against the company record or the research notes, and every top entry was read against the company’s own website. Sources and check dates are under each entry.
Przemysław Zalewski, a senior full-stack engineer in Wrocław with 15+ years of shipping software. I ran this catalog for two months while choosing my own next clients, so every number here was useful to me before it was useful to you. I build with coding agents, work with clients in the US and the UK, and I sell the alternative to the agencies on this list.
“a true bias for action” client CTO, public LinkedIn recommendation
Confidential by default. NDA is standard. I never show your project, name or screenshots without written consent, which is why this site names no clients without permission.
Your code, your accounts. Code and data stay in your repository and accounts. AI tools run with training on your data turned off, and secrets never reach a model.
A handover you can use. Every project ends with the same checklist: a README that gets it running, one architecture diagram, written decisions, CI, a runbook and a recorded walkthrough. It is done when someone outside the project can run it from the docs.
Boring technology where it counts. I pick a stack you can hire for. Anything experimental needs your yes and an exit plan.
Approach matched to your risk appetite. Prototype, product or regulated: the level decides how much autonomy the agents get and how much review and validation each change needs.
Everything checkable. Every number on my pages links to its source. My tools are free, and the idea validator skill is open source (MIT).
My pledge
Reply within 24 hours. I reply within 24 hours on working days, personally, not a bot. Weekend messages: by Monday noon.
Late means free. If I am late, the first hour of work is free. You do not have to ask.
Scope in writing within 24 hours. A free 30-minute call with no company deck, then the scope and the price in writing within 24 hours. You decide.
The person who does the work. You talk to the person who does the work. No sales layer, no handoff.
Follow-up only with news. I follow up only when I have something new for you. Never a "did you see my offer".
Honest "not a fit". If I am not the right person, I say so on the call and point you to someone who is.
korg.software
