
SEROKELL
ReviewResearch-driven software engineering for fintech, blockchain, and scientific computing

About SEROKELL
Serokell is a research-oriented software development firm founded in 2015 and registered in Paris, France. The company brings together 60+ engineers with advanced mathematics and theoretical computing backgrounds to tackle technically demanding problems in distributed systems, blockchain, and AI. With a 4.9 Clutch rating across 33 reviews, they are known for assigning C-level oversight to each engagement and emphasizing provably correct, secure code. Their academic approach makes them well-suited for clients in fintech, biotech, and blockchain where code correctness and security are non-negotiable.
Who SEROKELL Is Best For
Serokell is the right partner for engineering leaders who have already tried standard outsourcing shops and found them under-equipped for genuinely hard problems. Their background in functional programming, formal methods, and cryptography gives them an edge on smart contract auditing, distributed protocols, and high-assurance financial systems.
Why Choose SEROKELL
Things to Consider
SEROKELL Services
Reviews from Google
Reviews sourced from Google
See all 10 reviews on GoogleMore Software Agencies

RapidDev
★ 8.1Operators that want AI strategy-to-execution plus custom software, internal tools, and growth systems from one partner
RapidDev is a Winchester, Massachusetts software and AI studio founded by Matt Graham (the about page dates the firm to 2021; some directories list 2020). The official site positions RapidDev as a strategy-to-execution partner for AI workflows and agents, custom web/mobile/SaaS, internal tools that launch in six weeks, and SEO/AEO/PPC growth — a documented shift from Bubble/no-code into custom engineering. The live site cites 220+ team members and 1,000+ partners across 20+ countries; Inc. lists RapidDev as a 2026 Inc. 5000 honoree (No. 573). Directories list $50-99/hr, a $5,000+ floor, and a 50-249 person team (DesignRush lists under 49).

Reenbit
★ 8.1Enterprises needing AI-driven software and data engineering with strong security standards
Reenbit is an AI-driven software development and data engineering company with 50-249 engineers, founded in 2018 and headquartered in Lviv, Ukraine. Microsoft-certified and ISO 27001:2022 compliant, they specialize in custom software, AI development, cloud consulting, and enterprise app modernization across healthcare, logistics, and financial services.

Relevant Software
★ 8.1Growth-stage and enterprise teams that want custom software and team extension from a Poland-headquartered engineering company
Relevant Software is a software development and consulting company founded in 2013. GoodFirms lists headquarters at Jana Dantyszka 18, Warsaw, Poland, with $25-49/hr and a 50-249 person team. The official site says the firm has delivered custom software since 2013, employs 100+ in-house experts, and requires a 3-month minimum commitment. Clutch lists 32 reviews at 4.9. Offices on the site are Lviv (22A Zolota Street), Warsaw, and Valencia (Avenida Cortes Valencianas 22). Schema on the site lists English, Ukrainian, Spanish, and Polish. A published case study covers FirstHomeCoach.