Best Kotlin software houses in Kraków

Which company fits your project

• TechWingsKotlin is 15% of the technology focus on its Clutch profile. Score 74, 4.9 on Clutch from 58 reviews, profit in 2024.
• korg.softwareKotlin is 10% of the technology focus on its Clutch profile. Score 70, 5.0 on Clutch from 10 reviews, profit in 2025.
• RailwaymenKotlin is 10% of the technology focus on its Clutch profile. Score 68, 4.9 on Clutch from 43 reviews, loss in 2025.
• SyberryKotlin is 10% of the technology focus on its Clutch profile. Score 67, 5.0 on Clutch from 13 reviews, loss in 2025.
• One senior instead of a teamIf the project fits one person with coding agents, compare the cost 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 Kotlin work; the share on Clutch is what the company declares.

The top 5 at a glance

Click a column to sort.

The ranking

1

TETechWings

Kraków software and design company offering outsourced product teams and team extension for web and mobile.

Clutch: 4.9 (58 reviews)Rate: 25–49 USD/hMin. project: 10,000 USDPremier Verified

Best for: A healthcare or productivity startup that wants UX design plus a web or mobile build at low hourly rates.

Pros

• Clutch shows 4.9 from 58 reviews and a Premier Verified badge.
• Clutch lists rates of 25–49 USD per hour and projects from 10,000 USD.
• Won three Clutch awards in 2024.
• Profitable in 2024, with 160K PLN of profit on 6.8M PLN of revenue.

Cons

• Case studies name no technologies, so its Kotlin, Flutter or Rails depth is hard to check.
• The team works mostly from home across 7 countries, with one Kraków address.
• Offers team extension next to project work, so confirm who owns delivery.

From their website and Clutch profile

• The about page claims 50 in-house professionals working from 7 countries, mostly from home. (source)
• The about page claims 150 projects and 38 industry awards since 2016. (source)
• The home page offers team extension next to fully outsourced development. (source)
• The work page names no technologies for its case studies. (source)

Clients they name: Microsoft, Standard Bank, Fornova, The Brussels Times, Cointree, Parknav

Product designResearch and developmentWeb developmentMobile developmentDevOps and automationTeam extension

Verdict. TechWings fits a startup MVP with a tight hourly budget and a need for design. Ask for code samples in your stack before you sign.

2

KOkorg.software

Small Kraków software house building custom web apps, websites and SaaS, with a second team in Ełk.

Clutch: 5.0 (10 reviews)Rate: 25–49 USD/hMin. project: 10,000 USD

Best for: A small service business that needs a custom web app, like quote automation, built by a small team.

Pros

• Clutch shows 5.0 from 10 reviews.
• Clutch lists rates of 25–49 USD per hour and projects from 10,000 USD.
• Profitable in 2025, with 121K PLN of profit on 908K PLN of revenue.
• The Highline case study shows automated quotes with payments and invoicing.

Cons

• The site shows no Kotlin or mobile work.
• A team of 9 people limits parallel work and holiday cover.
• Only three case studies are published, with no dates.

From their website and Clutch profile

• The team page lists 9 people, from the CEO to frontend developers. (source)
• The Highline case study describes automated quotes, payments and invoicing built in React and Node. (source)
• The site shows three case studies, Highline, Corgi and Singula, and no portfolio index. (source)
• The site does not mention Kotlin or Android work. (source)

Clients they name: Highline, Wiso Group

Custom software developmentWebsite creationProduct designOngoing support and maintenance

Verdict. Pick korg.software for a small web app or internal tool on a tight budget. Skip it for a mobile app or a project that needs a large team.

3

RARailwaymen

Kraków software house building web and mobile products, with a focus on fintech, foodtech and construction tech.

Clutch: 4.9 (43 reviews)Rate: 50–99 USD/hMin. project: 25,000 USD

Best for: A fintech or foodtech startup that wants a Rails web app and a Kotlin mobile app from one team.

Pros

• Clutch shows 4.9 from 43 reviews, with projects from 25,000 USD.
• Holds ISO 27001, useful for fintech and payment work.
• Lists Ruby on Rails for web and Kotlin for mobile on its service pages.
• Has run since 2009 and claims 55+ people in Kraków.

Cons

• Reported a loss of 1.7M PLN on 6.9M PLN of revenue in 2025.
• Had zero open roles at the last snapshot.
• Three family foundations still in registration own the company, a fresh ownership change.

From their website and Clutch profile

• The about page says the Kraków team has 55+ people. (source)
• The about page timeline starts in June 2009 and records the ISO 27001 certification. (source)
• The web development page lists Ruby on Rails and Vue among its stack. (source)
• The home page shows Gulf clients such as Shawarmer and Moyasar and an AI assistant for GCC restaurants. (source)

Clients they name: Autodesk, Moyasar, Shawarmer, ProEst, Hydr, Alamar

Product design and discoveryMVP developmentWeb development (Ruby on Rails, Vue)Mobile development (Kotlin, Swift)DevOps and 24/7 monitoringSecurity and compliance

Verdict. Railwaymen fits a fintech or foodtech product that needs web, mobile and ISO 27001 from one vendor. Check the 2025 loss before a multi-year deal.

4

SYSyberry

Austin-based custom software firm with a Kraków office, promising a product launch in 12 weeks.

Clutch: 5.0 (13 reviews)Rate: 50–99 USD/hMin. project: 50,000 USDVerified

Best for: A US or EU company that wants a custom business app or SaaS from a larger team by a set date.

Pros

• Clutch shows 5.0 from 13 reviews and a Verified badge.
• Publishes engagement terms, with fixed-scope projects up to 500,000 USD.
• Promises money back if agreed criteria are missed in the first 30 days.
• Revenue reached 11M PLN in 2025, and the group claims more than 250 engineers.

Cons

• The Kraków company belongs to the US Syberry Corporation, headquartered in Austin.
• Dedicated teams need a 1-year minimum, with 300,000 USD as the benchmark spend.
• Reported a small loss of 77K PLN in 2025.

From their website and Clutch profile

• The contact page lists offices in Austin, Kraków and Minsk. (source)
• The about page claims more than 250 software experts and more than 150 success stories. (source)
• The pricing page caps fixed-scope projects at 500,000 USD and gives 300,000 USD as the benchmark for a dedicated team. (source)
• The pricing page promises money back if agreed success criteria are missed in the first 30 days. (source)

Clients they name: Daimler Truck, JLL, Broadridge, Goodwin, Bridgewater

Custom software and SaaS developmentMobile appsCloud and DevOpsAI and ML developmentLegacy modernization and maintenanceQA and testingAI

Verdict. Syberry fits a company that wants a managed team with written guarantees and a US contract partner. Skip it for a small MVP or a short engagement.

5

IMImplex

App developer with Kraków and Kyiv offices, building web, Flutter and .NET MAUI apps for startups.

Clutch: 5.0 (21 reviews)Rate: 50–99 USD/hMin. project: 10,000 USDPremier Verified

Best for: Edtech startups that want a Flutter mobile app, or an Airtable prototype rebuilt as a real product.

Pros

• Case studies include a Flutter learning app for primary school pupils.
• One case moves a commission engine from an Airtable prototype to custom code.
• Clutch shows 5.0 from 21 reviews, with a Premier Verified badge.

Cons

• The Polish company lost 131K PLN in 2025 on 3.2M PLN of revenue.
• The site names no legal entity or address.
• Clutch lists IT staff augmentation and managed services among its services.

From their website and Clutch profile

• The home page says over 80% of the team are senior developers and project managers. (source)
• Case studies include a Flutter learning app for primary school pupils and a Xamarin to MAUI rewrite. (source)
• The site names no legal entity or address, and DOU lists offices in Kraków and Kyiv. (source)
• The blog announces a Clutch award as a top Ukrainian B2B firm. (source)

Clients they name: Admit.me, YOY

Web developmentMobile development (Flutter, .NET MAUI)Managed teamsAI developmentUX/UI designProject management consulting

Verdict. Consider Implex for an edtech mobile app or a move off low-code. Ask which entity signs and where the team works.

Every company we checked

The table below has the 17 companies with Kotlin evidence in Kraków, including the ones that do not qualify for the ranking, with the reason. Sort by any column.

Show all 17 companies

Size:10-4950-249250-9991000-9999 Rate:25-49 USD50-99 USD100-149 USD150-199 USD · 17

#	Company	HQ (KRS)	People	Clutch	Rate	Revenue	Profit	Focus	Score	Links
1	TE TechWingsProduct design	Kraków	50-249	4.9 · 58	25–49 USD/h	6.8M PLN	160K PLN	Product design	74	WebsitePortfolioClutchKRS
2	KO korg.softwareCustom software	Kraków	10-49	5.0 · 10	25–49 USD/h	908K PLN	121K PLN	Custom software	70	WebsiteClutchKRS
3	RA RailwaymenProduct design and discovery	Kraków	50-249	4.9 · 43	50–99 USD/h	6.9M PLN	-1.7M PLN	Product design and discovery	68	WebsitePortfolioClutchKRS
4	SY SyberryCustom software and SaaS	Kraków	250-999	5.0 · 13	50–99 USD/h	11M PLN	-77K PLN	Custom software and SaaS	67	WebsitePortfolioClutchKRS
5	IM ImplexWeb	Kraków	50-249	5.0 · 21	50–99 USD/h	3.2M PLN	-131K PLN	Web	65	WebsitePortfolioClutchKRS
–	N-iXbody leasing	Kraków	1000-9999	4.8 · 35	50–99 USD/h	15.5M PLN	1.2M PLN	.NET	79	WebsiteClutchKRS
–	Sii Polandbody leasing	Warsaw	1000-9999	4.9 · 44	n/a	2155.9M PLN	261M PLN	wszystko	78	WebsiteClutchKRS
–	HA Halo Labtoo little client evidence	n/a	50-249	4.9 · 100	25–49 USD/h	n/a	n/a	AI	49	WebsiteClutch
–	GI Giraffe Studiotoo little client evidence	n/a	10-49	5.0 · 23	n/a	n/a	n/a		48	WebsiteClutch
–	CH CHI Softwaretoo little client evidence	n/a	250-999	5.0 · 32	50–99 USD/h	n/a	n/a	AI	47	WebsiteClutch
–	SY Synergy Labstoo little client evidence	n/a	50-249	4.9 · 45	50–99 USD/h	n/a	n/a	AI	47	WebsiteClutch
–	IN Infolettoo little client evidence	n/a	50-249	5.0 · 2	n/a	n/a	n/a	Java	45	WebsiteClutch
–	AX Axontoo little client evidence	n/a	50-249	4.8 · 42	25–49 USD/h	n/a	n/a		43	WebsiteClutch
–	IN Inspirit Devtoo little client evidence	n/a	10-49	5.0 · 7	50–99 USD/h	n/a	n/a	AI	42	WebsiteClutch
–	TH The APP Solutionstoo little client evidence	n/a	50-249	4.7 · 21	25–49 USD/h	n/a	n/a		42	WebsiteClutch
–	PE Peak11too little client evidence	n/a	10-49	4.9 · 5	50–99 USD/h	n/a	n/a	AI	40	WebsiteClutch
–	CO Codaheadtoo little client evidence	n/a	50-249	4.7 · 6	25–49 USD/h	n/a	n/a	AI	38	WebsiteClutch

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 5, and why

What they charge

Check any agency yourself in 10 minutes

1. Kotlin covers two different jobs: Android apps and JVM back ends. Ask which one the team does, because the people rarely overlap.
2. 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.
3. Read the last financial statement on rejestr.io: revenue, profit or loss, and whether it was filed on time.
4. Check the VAT white list: active, and the name matches the contract.
5. On the Clutch list hover over the company link; a link through ppc.clutch.co is an ad. Then read the reviews themselves.
6. On GoWork read the employee reviews, not the stars, and look for layoffs and rotation.
7. Ask who exactly will work on your project, and check those people on LinkedIn.