Best blockchain development companies in Poland

Which company fits your project

• 4SoftBlockchain is 90% of service lines on its Clutch profile. Score 87, 5.0 on Clutch from 59 reviews, profit in 2024.
• InnowiseBlockchain is 10% of service lines on its Clutch profile. Score 84, 4.9 on Clutch from 73 reviews, profit in 2025.
• Espeo SoftwareBlockchain is 30% of service lines on its Clutch profile. Score 82, 4.8 on Clutch from 40 reviews, profit in 2025.
• NetiBlockchain is 40% of service lines on its Clutch profile. Score 81, 5.0 on Clutch from 12 reviews, profit 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 blockchain work; the share on Clutch is what the company declares.

The top 10 at a glance

Click a column to sort.

#	Company	HQ (KRS)	People	Clutch	Rate	Focus	Score
1	4Softprofit 501K PLN (2024)review cluster	Wrocław	20-50	5.0 · 59	50–99 USD/h	Blockchain development and smart contracts	87
2	Innowiseprofit 3M PLN (2025)GoWork 65/10	Warsaw	1000-9999	4.9 · 73	50–99 USD/h	Custom software	84
3	Espeo Softwareprofit 2.7M PLN (2025)GoWork 18/22	Poznań	50-249	4.8 · 40	25–49 USD/h	Software development and maintenance	82
4	Netiprofit 817K PLN (2025)GoWork 6/0	Rzeszów	10-49	5.0 · 12	50–99 USD/h	Blockchain consulting and architecture	81
5	Rite NRGprofit 2.3M PLN (2024)	Wrocław	50-249	4.9 · 16	50–99 USD/h	Software consulting and engineering	78
6	Evojamprofit 95K PLN (2025)GoWork 6/1	Warsaw	10-49	4.9 · 12	50–99 USD/h	Custom software	78
7	Montrose Softwareloss 25K PLN (2025)GoWork 8/3	Kraków	50-249	4.9 · 8	50–99 USD/h	Custom software	76
8	SE SENLAprofit 1.7M PLN (2025)	Warsaw	250-999	4.9 · 19	25–49 USD/h	Staff augmentation	75
9	CO Cowchainprofit 83K PLN (2025)	Warsaw	50-249	5.0 · 36	25–49 USD/h	Web3 full-stack	74
10	Concise Softwareprofit 295K PLN (2025)foreign-owned	Rzeszów	50-249	4.7 · 23	50–99 USD/h	Web	73

The ranking

1

4Soft

Wrocław blockchain and machine learning software house for crypto compliance, analytics and DeFi, with a second office in Dubai.

Clutch: 5.0 (59 reviews)Rate: 50–99 USD/hMin. project: 5,000 USDPremier Verified

Best for: Crypto, DeFi and blockchain compliance products that need smart contracts or analytics from a team that has shipped both for named crypto firms.

Pros

• 4Soft reported a profit of 501K PLN on 12.2M PLN of revenue in 2024, its latest filing we have.
• Clutch shows a 5.0 rating from 59 reviews and a Premier Verified badge.
• The site lists twenty-five case studies, many with named crypto clients such as Elliptic and Cryptio.
• The site shows ISO 9001 and ISO 27001, which helps buyers with compliance checklists.

Cons

• Blockchain makes up 90% of the declared work, and the site shows little experience outside crypto.
• GoWork got 8 positive reviews within 14 days from August 14, 2026, so the employee picture (8 positive, 3 negative) is hard to read.
• The latest filing we have is for 2024. The site dates the story to 2013, while the S.A. in KRS dates from 2020 after a rebrand.

From their website and Clutch profile

• The about page dates the story to 2013, while KRS 0000831231 in our data and Clutch's legal formation date point to 2020 for the current entity (source: https://4soft.co/about-us and https://clutch.co/profile/4soft).
• The home page claims a top 3 position among blockchain companies worldwide without citing a source (source).
• The home page claims 50+ people, while the 2021 timeline entry mentions 70 experts (source: https://4soft.co/ and https://4soft.co/about-us).
• Both ISO certificates are downloadable PDFs, which most peers do not offer, but the page names no certifying body (source).
• The Get an estimate button on the home page links to an empty anchor (source).
• Clutch lists 59 reviews at 5.0, a $5,000 minimum project and blockchain packages from $4,500 (source).

Clients they name: Elliptic, Cryptio, Colony, Paribus, Gigaset, Artclear

Blockchain development and smart contractsBlockchain analytics and forensicsCrypto compliance (AML screening, KYC flows)Machine learning and AITeam extensionProduct developmentNode.jsPythonBlockchainMachine learning

Verdict. Pick 4Soft for crypto and blockchain compliance work, where its case studies and Clutch reviews can be checked. For a general web product, pick a generalist.

2

Innowise

Very large outsourcing and staff augmentation company with a Warsaw headquarters claim and a catalog covering almost every technology.

Clutch: 4.9 (73 reviews)Rate: 50–99 USD/hMin. project: 10,000 USD

Best for: Teams that must add several developers quickly and can manage an outsourced team under their own tech lead.

Pros

• The Polish company reported 251.2M PLN of revenue and a profit of 3.0M PLN in its 2025 filing.
• Clutch shows 4.9 from 73 reviews.
• GoWork employee reviews lean positive, with 65 positive and 10 negative.
• The site lists ISO 9001, ISO 27001 and ISO 13485.

Cons

• The margin is thin, with profit at about one percent of revenue.
• The case studies page names no clients and warns that details may be generalized or modified. The portfolio cannot be checked.
• The Polish company dates from 2021, while the site claims 2007. The footer gives a registered address in Boston, and the job boards showed no open roles at the last snapshot.

From their website and Clutch profile

• The about page claims 3,500+ people, 1,600 projects and a founding year of 2007. The Polish company in KRS dates from 2021 (source).
• The FAQ names Warsaw as headquarters, while the footer gives a registered address in Boston, MA (source).
• The case studies page names no clients and warns that client details may be generalized or modified (source).
• Innowise sells staff augmentation openly, promising CVs in 1 to 2 days and a team joining in 3 to 5 days (source).

Clients they name: Hays, Spar, Tietoevry, Topcon, NTT Data, Commercial Bank of Qatar

Custom software developmentStaff augmentation and dedicated teamsTesting and QAData, AI and MLERP and CRMLegacy modernizationAI

Verdict. Use Innowise for staff augmentation under your own tech lead when you need CVs fast across many technologies. Skip it when you need a partner whose past work you can verify.

3

Espeo Software

Poznań software company focused on fintech, payments and blockchain, with a second entity in Helsinki.

Clutch: 4.8 (40 reviews)Rate: 25–49 USD/hMin. project: 5,000 USD

Best for: Fintech, payments and blockchain companies that need a specialist team at a moderate rate.

Pros

• Espeo Software reported a profit of 2.7M PLN on 26.2M PLN of revenue in 2025.
• Espeo works in fintech, payments and blockchain and holds a Hyperledger certification.
• Clutch shows 40 reviews averaging 4.8, from clients such as Terveystalo and The Guardian.
• The site and the registry both date the company to 2008.

Cons

• GoWork opinions are more negative than positive, with 18 positive, 22 negative and 11 mentions of layoffs.
• The declared rate of 25 to 49 USD is the offshore band, low for a Poznań team.
• Its 3 open JustJoin offers are talent pools rather than roles for live projects.

From their website and Clutch profile

• Paweł and Sylwia Rogowicz founded Espeo in 2008, which matches the registry date (source).
• Espeo runs two entities, Espeo Software sp. z o.o. in Poznań and Espeo Software Oy in Helsinki (source).
• Case studies focus on payments and digital assets, including Unbound Security, now part of Coinbase (source).
• Clutch lists 40 reviews and a 25 to 49 USD rate band (source).

Clients they name: Terveystalo, The Guardian, Ensto, Schibsted, CoinTracking, Unbound Security

Software development and maintenanceTeam augmentation and managed teamsProduct consulting and auditsBlockchain solutionsAI-SDLC adoptionBuild-operate-transferReact NativeAndroidiOSFlutter

Verdict. Pick Espeo Software for payment, banking or blockchain products at a moderate rate. Check staff stability first, given 11 mentions of layoffs.

4

Neti

Rzeszów blockchain and payments engineering firm that builds stablecoin, tokenization and DLT infrastructure for fintechs and protocols.

Clutch: 5.0 (12 reviews)Rate: 50–99 USD/hMin. project: 25,000 USD

Best for: Fintechs, payment companies and protocol teams that need blockchain, stablecoin or tokenization engineering beyond a prototype.

Pros

• Profitable, with 817K PLN of profit on 5.3M PLN of revenue in 2025.
• GoWork employee reviews are all positive, 6 positive and 0 negative.
• Holds a 5.0 rating on Clutch from 12 reviews and publishes case studies for Filecoin, Liberland and Kyoto Protocol.

Cons

• Most of the work is crypto and Web3, so general web products are a side business.
• The minimum project is 25,000 USD, and the site makes unverifiable claims such as 100% vulnerability-free deployments.
• Some directories list the wrong domain, and the company site is neti-soft.com.

From their website and Clutch profile

• The domain neti.pl shows a domain-for-sale page, and the company site is neti-soft.com (source).
• The about page dates the company to 2010 and its move into blockchain and fintech to 2019 (source).
• The site claims 40+ in-house specialists, 120+ projects and '100% vulnerability-free production deployments', which we could not check (source).
• Clutch lists 5.0 from 12 reviews, a 25,000 USD minimum and a second address in London (source).

Clients they name: Filecoin Incentive Design Labs (FIDL), Liberland, Kyoto Protocol, Alvarum, FactoryDAO, MaxxChain

Blockchain consulting and architectureSmart contracts and dAppsStablecoin and payment infrastructure (NetiRails)Asset tokenizationZero-knowledge privacyCustom enterprise softwareAI

Verdict. Start with Neti for stablecoins or tokenization. For an ordinary web app, choose a generalist.

5

Rite NRG

Wrocław software and AI engineering company supplying delivery teams, managed services and fixed-scope releases, with Web3 roots.

Clutch: 4.9 (16 reviews)Rate: 50–99 USD/hMin. project: 25,000 USD

Best for: Scale-ups that must staff an engineering team quickly or ship a fixed-scope AI release.

Pros

• Rite NRG reported a profit of 2.3M PLN on 26.6M PLN of revenue in 2024.
• Deloitte Technology Fast 50 Central Europe recognized its growth in 2025.
• Rite NRG offers a fixed-scope, fixed-price release path next to team supply.
• Clutch shows 16 reviews averaging 4.9.

Cons

• Clutch puts IT managed services at 60% of the work, so team supply is the core business.
• Most case studies are anonymous, and only Metapro is named.
• The latest filing in our data is for 2024, one year older than for most peers.

From their website and Clutch profile

• The awards page lists Deloitte Technology Fast 50 Central Europe 2025 and Fast 500 EMEA 2023 (source).
• Most case studies are anonymous, and Metapro is the only client named on the homepage (source).
• The site gives only a Wrocław address, while Clutch also lists Kraków and Malmö (source).
• The homepage shows a 4.9 rating from 16 verified Clutch reviews (source).

Clients they name: Metapro

Software consulting and engineeringAI consulting and automationTechnology talent and teamsManaged technology servicesBlockchain and Web3Blockchain

Verdict. Use Rite NRG to scale a team quickly, backed by its Web3 and AI work. Ask for named references before a fixed-price build.

7

Montrose Software

Kraków engineering team with a New Jersey sales office that builds data, finance and e-commerce software for US clients.

Clutch: 4.9 (8 reviews)Rate: 50–99 USD/hMin. project: n/a

Best for: US finance and e-commerce firms looking for an ISO-certified Kraków team for data and reporting work.

Pros

• The site names US finance clients such as Wells Fargo and Lord Abbett across 18 case studies.
• Lists ISO/IEC 27001:2022 and ISO 9001:2015, which regulated clients often require.
• The last snapshot showed 2 remote roles on JustJoin. GoWork reviews lean positive, with 8 positive and 3 negative.

Cons

• The 2025 statement shows a small loss of 25K PLN on 10.5M PLN of revenue.
• Clutch has only 8 reviews for a company that claims over 200 clients since 2012.
• Clutch lists New Jersey as headquarters, so a Polish buyer may first deal with a US-facing sales team.

From their website and Clutch profile

• The projects page shows 18 case studies, mostly US finance and e-commerce clients such as Wells Fargo and Lord Abbett, and claims over 200 clients since 2012 (source).
• The home page shows ISO/IEC 27001:2022 and ISO 9001:2015, plus addresses in Kraków and South Orange, NJ (source).
• Clutch names South Orange, NJ as headquarters, while KRS places the Polish company in Kraków (source).
• Clutch shows 4.9 from 8 reviews, with reported budgets from 180,000 USD up to 1 million USD (source).

Clients they name: Wells Fargo, Lord Abbett, Climate Bonds Initiative, Freshpair, Home Partners, Kids Discover

Custom software developmentWeb and e-commerce developmentMobile app developmentAI and machine learningCloud engineering and DevOpsQA and testingDockerKubernetesReactJavaScript

Verdict. Use Montrose Software for finance data, reporting or e-commerce migrations aimed at the US market. Skip it if you want a Poland-focused partner with many public reviews.

9

COCowchain

Web3 development team building dApps, smart contracts, DeFi and AI agent platforms for crypto startups.

Clutch: 5.0 (36 reviews)Rate: 25–49 USD/hMin. project: 25,000 USD

Best for: Crypto startup that needs a DeFi protocol, bridge or dApp built by a Web3 team.

Pros

• Works only in Web3, with dApps, DeFi and smart contracts as core work.
• Clutch shows 5.0 from 36 reviews.
• Shows shipped products such as RetroBridge, with $200M bridged volume.
• Clutch lists rates of $25 to $49 an hour.

Cons

• The Polish company reported only 109K PLN of revenue in 2025 while the site claims 50+ developers.
• The site lists no address or legal entity, so check who signs the contract.
• The site shows little Rust or embedded C++ work.

From their website and Clutch profile

• The site gives no address or legal entity, only the name Cowchain Co. in the footer. (source)
• The home page claims 50+ Web3-native developers. (source)
• The RetroBridge case claims $200M bridged volume and 1M+ transactions. (source)
• GoodFirms lists cowchain.io at Chałubińskiego 8 in Warsaw, the KRS address. (source)

Clients they name: RetroBridge, StepApp, GMX Blueberry Club, agnt.hub, Hybrid

Web3 full-stack developmentSmart contracts and DeFiBlockchain consultingWhite-label solutionsWeb3 UI/UX designSmart contract security audits

Verdict. Pick Cowchain for a Web3 product built by a crypto-native team, after checking the contracting entity. Skip it outside blockchain.

10

Concise Software

Rzeszów development center of a German-owned software company that builds web, mobile and blockchain products for European brands.

Clutch: 4.7 (23 reviews)Rate: 50–99 USD/hMin. project: 10,000 USD

Best for: German and other European companies that want a web or mobile product from a Rzeszów team managed from Germany.

Pros

• Publishes named case studies with large brands such as Porsche, Santander and Visa.
• Profitable in 2025, with 295K PLN on 6.2M PLN of revenue.
• Holds a 4.7 rating on Clutch from 23 reviews and runs offices in Rzeszów, Warsaw, Hamburg and Atlanta.

Cons

• The German DEVELOPX GMBH owns the company and publishes the website, so strategy is decided abroad.
• Employee reviews are mixed, with 10 positive and 8 negative, and the latest dates from 2023.
• The last snapshot showed zero open roles.

From their website and Clutch profile

• The impressum names DevelopX GmbH in Hamburg as the publisher of the site (source).
• The site lists offices in Rzeszów, Warsaw, Hamburg and Atlanta, with the Warsaw address at the Cambridge Innovation Center in Varso Place (source).
• Case studies name Porsche, Santander and Visa with Rambus (source).
• Clutch lists 4.7 from 23 reviews and gives Berlin as headquarters (source).

Clients they name: Porsche, Santander, Visa, Rambus, Volkswagen, Delivery Hero

Web development (React, Angular, Node.js, NestJS)Mobile development (iOS, Android)Product design and discovery workshopsBlockchain developmentIoT solutionsTeam extension

Verdict. Concise Software fits a German-speaking client who wants Polish delivery and brand references. A Polish client will mostly talk to Hamburg.

Every company we checked

The table below has the 45 companies with blockchain evidence in Poland, including the ones that do not qualify for the ranking, with the reason. Sort by any column.

Show all 45 companies

Size:10-4920-5050-249250-9991000-9999 Rate:25-49 USD50-99 USD100-149 USD150-199 USD · 45

#	Company	HQ (KRS)	People	Clutch	Rate	Revenue	Profit	Focus	Score	Links
1	4SoftBlockchain development and smart contracts	Wrocław	20-50	5.0 · 59	50–99 USD/h	12.2M PLN	501K PLN	Blockchain development and smart contracts	87	WebsitePortfolioClutchKRS
2	InnowiseCustom software	Warsaw	1000-9999	4.9 · 73	50–99 USD/h	251.2M PLN	3M PLN	Custom software	84	WebsitePortfolioClutchKRS
3	Espeo SoftwareSoftware development and maintenance	Poznań	50-249	4.8 · 40	25–49 USD/h	26.2M PLN	2.7M PLN	Software development and maintenance	82	WebsitePortfolioClutchKRS
4	NetiBlockchain consulting and architecture	Rzeszów	10-49	5.0 · 12	50–99 USD/h	5.3M PLN	817K PLN	Blockchain consulting and architecture	81	WebsitePortfolioClutchKRS
5	Rite NRGSoftware consulting and engineering	Wrocław	50-249	4.9 · 16	50–99 USD/h	26.6M PLN	2.3M PLN	Software consulting and engineering	78	WebsitePortfolioClutchKRS
6	EvojamCustom software	Warsaw	10-49	4.9 · 12	50–99 USD/h	5.3M PLN	95K PLN	Custom software	78	WebsitePortfolioClutchKRS
7	Montrose SoftwareCustom software	Kraków	50-249	4.9 · 8	50–99 USD/h	10.5M PLN	-25K PLN	Custom software	76	WebsitePortfolioClutchKRS
8	SE SENLAStaff augmentation	Warsaw	250-999	4.9 · 19	25–49 USD/h	25.8M PLN	1.7M PLN	Staff augmentation	75	WebsitePortfolioClutchKRS
9	CO CowchainWeb3 full-stack	Warsaw	50-249	5.0 · 36	25–49 USD/h	109K PLN	83K PLN	Web3 full-stack	74	WebsitePortfolioClutchKRS
10	Concise SoftwareWeb	Rzeszów	50-249	4.7 · 23	50–99 USD/h	6.2M PLN	295K PLN	Web	73	WebsitePortfolioClutchKRS
–	RU Rumble Fishtoo little client evidence	Kraków	10-49	4.6 · 9	50–99 USD/h	8.7M PLN	604K PLN	Blockchain and Web3	70	WebsitePortfolioClutchKRS
–	The Force Codetoo little client evidence	Wrocław	10-49	5.0 · 2	25–49 USD/h	1.1M PLN	87K PLN	Node.js	68	WebsiteClutchKRS
–	Ulan Softwaretoo little client evidence	Wrocław	10-49	5.0 · 1	25–49 USD/h	5.6M PLN	261K PLN	Web and mobile	68	WebsitePortfolioClutchKRS
–	CO Computoolstoo little client evidence	Warsaw	250-999	4.9 · 106	25–49 USD/h	1.6M PLN	-387K PLN	IT consulting and business analysis	66	WebsitePortfolioClutchKRS
–	IN Interexytoo little client evidence	Warsaw	250-999	4.9 · 74	25–49 USD/h	1.2M PLN	-16K PLN	AI	66	WebsiteClutchKRS
–	TA Talliumno office (Clutch “serves”)	Rzeszów	50-249	5.0 · 44	25–49 USD/h	9.4M PLN	n/a	AI	66	WebsiteClutchKRS
–	Webinitoo little client evidence	Wrocław	50-249	4.6 · 11	50–99 USD/h	156K PLN	91K PLN	Platform design and MVP builds	66	WebsitePortfolioClutchKRS
–	A4BEEtoo little client evidence	Wrocław	50-249	5.0 · 7	50–99 USD/h	20.2M PLN	-1.9M PLN	Digital lab integration	63	WebsitePortfolioClutchKRS
–	ULAM LABStoo little client evidence	Wrocław	50-249	4.8 · 13	50–99 USD/h	235K PLN	-194K PLN	MedTech product	57	WebsitePortfolioClutchKRS
–	Alcosi Grouptoo little client evidence	Wrocław	50-249	5.0 · 3	50–99 USD/h	451K PLN	-211K PLN	JavaScript	55	WebsiteClutchKRS
–	PE Peikotoo little client evidence	n/a	50-249	5.0 · 169	25–49 USD/h	n/a	n/a	AI	53	WebsiteClutch
–	IN Infograins Software Solutionstoo little client evidence	n/a	250-999	4.9 · 89	50–99 USD/h	n/a	n/a	AI	50	WebsiteClutch
–	NE Nextropetoo little client evidence	n/a	10-49	5.0 · 18	50–99 USD/h	n/a	n/a		47	WebsiteClutch
–	AE Aetsofttoo little client evidence	n/a	50-249	5.0 · 15	50–99 USD/h	n/a	n/a	AI	46	WebsiteClutch
–	DE DevBrothertoo little client evidence	n/a	50-249	5.0 · 13	25–49 USD/h	n/a	n/a		46	WebsiteClutch
–	AL Altorostoo little client evidence	n/a	250-999	4.8 · 34	50–99 USD/h	n/a	n/a		45	WebsiteClutch
–	AR Artkaitoo little client evidence	n/a	50-249	4.9 · 53	50–99 USD/h	n/a	n/a	AI	45	WebsiteClutch
–	DA Dashbouquet Developmenttoo little client evidence	n/a	50-249	4.9 · 34	50–99 USD/h	n/a	n/a	AI	45	WebsiteClutch
–	NO Novus Teamtoo little client evidence	n/a	10-49	5.0 · 12	50–99 USD/h	n/a	n/a		45	WebsiteClutch
–	PI PixelPlextoo little client evidence	n/a	50-249	4.9 · 33	50–99 USD/h	n/a	n/a	AI	45	WebsiteClutch
–	WI Wise Visiontoo little client evidence	n/a	50-249	5.0 · 12	25–49 USD/h	n/a	n/a		44	WebsiteClutch
–	GO GO ONLINEtoo little client evidence	n/a	10-49	5.0 · 11	25–49 USD/h	n/a	n/a	AI	43	WebsiteClutch
–	IC ICEOtoo little client evidence	n/a	10-49	5.0 · 10	50–99 USD/h	n/a	n/a		43	WebsiteClutch
–	ME mentetoo little client evidence	n/a	10-49	5.0 · 11	n/a	n/a	n/a		43	WebsiteClutch
–	SY Symfatoo little client evidence	n/a	50-249	4.9 · 18	50–99 USD/h	n/a	n/a	AI	43	WebsiteClutch
–	UA UASOFTDEVtoo little client evidence	n/a	50-249	5.0 · 11	25–49 USD/h	n/a	n/a	AI	43	WebsiteClutch
–	CR CROSStoo little client evidence	Opole	50-249	5.0 · 2	50–99 USD/h	n/a	n/a	AI	42	WebsiteClutch
–	IN INtoo little client evidence	n/a	10-49	5.0 · 4	25–49 USD/h	n/a	n/a	AI	42	WebsiteClutch
–	IN Inovaticatoo little client evidence	n/a	10-49	4.9 · 9	50–99 USD/h	n/a	n/a		42	WebsiteClutch
–	QU Qulixtoo little client evidence	n/a	250-999	4.9 · 10	50–99 USD/h	n/a	n/a	AI	42	WebsiteClutch
–	TE teonitetoo little client evidence	n/a	10-49	4.8 · 11	100–149 USD/h	n/a	n/a	AI	41	WebsiteClutch
–	TO Tokenomia.protoo little client evidence	n/a	10-49	5.0 · 6	50–99 USD/h	n/a	n/a	AI	41	WebsiteClutch
–	18 180 Creativetoo little client evidence	n/a	10-49	4.9 · 6	25–49 USD/h	n/a	n/a		40	WebsiteClutch
–	SM Smartym Protoo little client evidence	n/a	10-49	4.7 · 15	25–49 USD/h	n/a	n/a		40	WebsiteClutch
–	MA Madifftoo little client evidence	n/a	50-249	4.9 · 4	50–99 USD/h	n/a	n/a	AI	39	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 10, and why

What they charge

Check any agency yourself in 10 minutes

1. Ask for audited smart contracts on mainnet and who did the audit. Blockchain agencies come and go with the market cycle, so check the company age and filings.
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.