Serokell.io is the website of Serokell OU, an Estonian custom software development firm that has been operating since 2015. Unlike many tech consultancies that pop up with fresh domains and no track record, Serokell shows real staying power: the domain has a decade of history in the Wayback Machine, links from Hacker News going back to 2018, and enough regular visitors that Google's Chrome UX Report tracks it. The company works in fintech, blockchain, machine learning, and biotech, and publishes detailed case studies on projects with partners like the Tezos Foundation and TON. If you're evaluating Serokell.io as a potential development partner, the key trust signals are there — a named company behind the domain, contact information that checks out, and an established reputation online. The site doesn't sell products directly or ask for payments, so the risks around 'is serokell.io a scam' are low. Always verify any contractor's credentials independently, but this site passes the basic smell test.
In plain English
Serokell is a legitimate software development company with over a decade of history, a verifiable business registration in Estonia, and a strong online footprint. The site is well-maintained and transparent about what it does. You can safely contact them for consulting, though as always do your own due diligence before entering into a contract.
Where the score comes from
Clean bill of health from Google Web Risk, modern TLS 1.3, and no malware or phishing flags. The site doesn't set browser-level protections like clickjacking blockers, but that's a common omission on service sites and not a major risk for a consultancy that doesn't handle logins directly.
The domain is 11 years old and registered under Serokell OU, a named Estonian company. The organization on the certificate matches the business named in WHOIS, which gives reasonable confidence this isn't a fly-by-night operation.
The site has been indexed by Google's Chrome UX Report, which means real people visit it regularly. Hacker News has discussed links to serokell.io across seven years, and the Wayback Machine shows a decade of history. That's a solid external footprint for a software consultancy.
The site clearly states what it does — custom software development — and lists contact info, an about page, team profiles, and social media links. The company name and location in Estonia are openly available. Nothing is hidden.
Privacy policy and terms of service are present, which is appropriate for a business site. The site doesn't handle user payments or logins directly, so GDPR cookie consent requirements are less strict here, but a cookie banner would be expected for visitors from the EU.
Professional setup: AWS CloudFront CDN, Google-hosted mail with DMARC enforcement, and a well-maintained sitemap with nearly 700 pages. No DNS blacklisting or security gaps in email authentication.
What we checked
Security & Transport
Certificate issued by Amazon
No threats detected by Google Web Risk
Server still accepts TLS 1.0/1.1 from clients that ask for them, which CDNs such as Cloudflare allow by default. Browsers stopped offering these versions in 2020, so visitors connect with TLS 1.2 or later
Cloudflare's malware-blocking resolver (1.1.1.2) answered normally for this domain. These resolvers refuse domains their threat intelligence lists for malware or phishing, and a scam only days old often isn't listed yet. Quad9 gave no usable answer.
Valid certificate, expires in 152 days
Neither a visitor arriving from a Google search nor Google's crawler was sent elsewhere or shown spam that a direct visit wasn't. Cloaking that checks the visitor's network address can't be seen from our server.
Site does not set common security response headers (CSP, HSTS, X-Frame-Options, etc)
Web server: nginx
Connection uses TLS 1.3
Identity & WHOIS
Site publishes an About / Team / Company page — a transparency signal that the operator is willing to describe who runs the business.
Site has custom branding and social media metadata
No dedicated legal-entity disclosure page detected — common and expected outside the EU, but required for commercial sites in Germany, France, Spain, Italy, and other EU jurisdictions.
Homepage has a contact page link, an email address on the site's own domain and a phone number
Domain created 2015-09-08 (11 years, 1 month ago)
Expires in 313 days
Website has both privacy policy and terms of service pages
Phone numbers from EE. Business markup gives an address in EE. Page language en. Hosting network registered in US.
The registration names Serokell OU as the owner. Owners enter this themselves and registrars don't check it.
Registered through Gandi SAS
Infrastructure & DNS
Site is served behind AWS CloudFront — indicates real operational investment in edge infrastructure
Domain enforces DMARC — unauthenticated mail is quarantined
Not listed by SpamCop and Barracuda, the blacklists that answered
Resolves to: 2600:9000:204e:da00:e:7e27:e2c0:93a1, 2600:9000:204e:1200:e:7e27:e2c0:93a1, 2600:9000:204e:7600:e:7e27:e2c0:93a1, 2600:9000:204e:6e00:e:7e27:e2c0:93a1, 2600:9000:204e:de00:e:7e27:e2c0:93a1, 2600:9000:204e:bc00:e:7e27:e2c0:93a1, 2600:9000:204e:3800:e:7e27:e2c0:93a1, 2600:9000:204e:b600:e:7e27:e2c0:93a1, 13.249.228.51, 13.249.228.37, 13.249.228.31, 13.249.228.125
Domain is not signed with DNSSEC
DNSSEC status from WHOIS
Mail servers: aspmx.l.google.com., alt2.aspmx.l.google.com., alt1.aspmx.l.google.com., alt4.aspmx.l.google.com., alt3.aspmx.l.google.com.
Hosted on: AS16509 AMAZON-02 (US)
DNS providers: ns-108.awsdns-13.com., ns-1455.awsdns-53.org., ns-1811.awsdns-34.co.uk., ns-801.awsdns-36.net.
Fast page load, timed once from our server in Europe including the DNS lookup, connection setup and any redirects
Domain has SPF email authentication configured
Reputation & Reach
Hacker News readers upvoted links to this site in 7 different years between 2018 and 2026. The most upvoted, "Rust vs. Haskell" (2023), got 271 points.
og:type declared as website
Serokell provides custom software development services in the domains of fintech, blockchain, machine learning, biotech, edtech, and ecommerce. We use functional programming to build custom high-performance IT solutions that serve 1B of users globally.
HTML declares lang="en"
Google's Chrome UX Report publishes data for https://serokell.io, which it only does once enough distinct real Chrome users have visited over the last 28 days.
Site maintains a proper sitemap with 696 indexed pages
Homepage links to profiles on Facebook, X, LinkedIn, YouTube
Site uses structured data identifying itself as: Organization
This site appears in the top 1 million websites
Earliest archive snapshot from 20160610
Website is live and responding
robots.txt has 6 directives and references a sitemap
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