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B2B software studio

finestcode.pl

Software tailored to your business.

We create more than software. We design complete technology ecosystems — from architecture and implementation to secure, scalable infrastructure. Every decision is made with purpose, selecting the right technologies for your business goals and refining every detail to the highest standard.

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About finestcode.pl

Independent software studio for companies looking for an experienced and committed long-term partner. You work with me directly — from early decisions and planning through implementation and the continued development of your product. I bring years of experience from demanding projects to deliver a smooth collaboration, predictable results, and solutions that support business growth. No unnecessary intermediaries, complex structures, or compromises on quality.

Working languages

  • Polish — Native
  • English — C1 — client and team ready

Engagement model

  • B2B contract partnership

    I prefer a collaboration model based on a clearly defined scope of responsibilities and accountability.

What we deliver

  • Building applications that grow with the business and support its product and strategic goals.
  • Improving customer management, data organization, and day-to-day operations through CRM systems and easy-to-use admin panels.
  • Designing clear and consistent interfaces that make the product easier to use for both customers and internal teams.
  • Connecting different systems and services so data flows smoothly and users can access the application securely.
  • Developing and maintaining large applications so new features can be added without disrupting the existing product.
  • Improving application speed, quality, and reliability to reduce the risk of delays, errors, and unnecessary costs.

How we build

Primary stack

Languages

TypeScript
JavaScript

Frontend

React
Next.js
App Router
Pages Router

State & Data

Redux
Zustand
MobX
SWR
Axios
React Query
Fetch
GraphQL
WebSockets
REST

Auth

NextAuth
OAuth 2.0
Clerk
JWT

UI & Styling

HeroUI
Tailwind CSS
MUI
Bootstrap
Styled Components
Sass
Less

Build Tools

Vite
Webpack
Rollup

Cloud & Hosting

AWS
Vercel
Heroku

Backend

Node.js
Express.js
Fastify
NestJS

DevOps

Docker
Kubernetes
K3s
Rancher
Linux
Nginx
Apache

Databases

MongoDB
MySQL
SQL
ArangoDB
Prisma ORM

Testing & Docs

Playwright
Puppeteer
Cypress
Jest
React Testing Library
Storybook

Version Control

Git
Bitbucket

Package Managers

Yarn
npm

Design

Figma
Adobe XD

Also experienced with

PHP
Laravel
CakePHP
Zend Framework
Symfony
AngularJS

Selected Projects & Partnerships

Client engagements that demonstrate how we work in B2B partnerships. Prior product and platform work is part of the senior capacity you get when you contract with finestcode.pl.

  • Senior frontend partnership

    DUOLIFE S.A.Remote
    Ongoing B2B

    2020 – Present

    • Long-term ownership of scalable TypeScript web applications — architecture, delivery, and code quality in production.
    • Complex React / Next.js interfaces with reusable components, SSR, and state management (Redux, Zustand) aligned to product needs.
    • Structured data layer with typed contracts, Axios, and SWR for efficient fetching and caching across features.
    • Secure REST integrations with JWT and OAuth 2.0; payment and third-party service flows where the business required them.
    • Design-system UI with Material UI and Tailwind, pixel-faithful builds from Figma / Adobe XD, documented in Storybook.
    • Multi-language, multi-region behaviour — country-driven pricing, currency, and billing rules via i18n.
    • Reliability through Jest and Cypress; Docker / Kubernetes (K3s) environments; monorepo maintenance with Lerna.

  • Full-stack product delivery

    Digitalprint.proCracow
    B2B / project

    2017 – 2020

    • Backend and API work in PHP / Laravel and Node.js (Express, NestJS) against MySQL in production.
    • Real-time features with Socket.io; frontend maintenance in AngularJS with a path toward modern stacks.
    • Containerised delivery with Docker, Kubernetes / K3s, and Jenkins pipelines supporting release cadence.

  • Platform engineering

    Unity Group S.A.
    Project

    2016 – 2017

    • Stabilised and evolved PHP / Zend / JavaScript / MySQL web services across client industries.
    • Agile delivery of features and production fixes for business-critical platforms.

  • Print platform & product editor

    Digitalprint.proCracow
    Long-term

    2012 – 2016

    • Built a print-shop management web app for configuring, personalising, and ordering print products online.
    • Browser-based product editor (AngularJS) with Socket.io sync to PHP / Node / MySQL backends and order workflows.

  • Data & web products

    Active8.pl S.C.Cracow
    Co-founded

    2012 – 2014

    • Custom crawl and aggregation pipeline for software/product data into a search-oriented MySQL store.
    • PHP / CakePHP services for extraction, normalisation, and scalable retrieval.

  • E-commerce engineering

    Morele.netCracow
    Employment

    2009 – 2011

    • Storefront and cart UX plus PHP / MySQL catalog, account, and order logic; external search and CMS integrations.

  • Full-stack web delivery

    Netstel SoftwareCracow
    Employment

    2008 – 2009

    • End-to-end PHP / MySQL applications — auth, data models, and accessible HTML/CSS interfaces for client requirements.

Let's talk cooperation

Have an idea for a new product, want to accelerate the growth of an existing solution, or need a trusted long-term partner? Get in touch — we’ll come back with clear next steps.

Cooperation
B2B contract — Open to new product partnerships and ongoing engineering collaboration.
Email
TODO — add email address
Phone
507110130
Location
Remote, Kraków, Oświęcim
LinkedIn
https://www.linkedin.com/in/dev-rafal-lesniak/ (opens in new tab)
GitHub
https://github.com/rafal-the-dev (opens in new tab)