Bespoke web applications
SaaS apps and internal tools. From MVP to systems serving thousands of users.
In the industry since 2010 · JDPL since 2018
Custom software systems for companies that have outgrown off-the-shelf tools
Just Develop, Program, Launch
Quality, Experience, Passion, Logic
We design websites, online stores and bespoke CMS platforms — from a single-page site to a scalable SaaS platform. One point of contact, from idea to launch. No agency ping-pong.
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Years in the industry
Professionally since 2010
2026
JDPL founded
An established company, not a startup
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Projects delivered
From MVP to SaaS platforms
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Companies that trusted us
Long-term relationships
About us — JDPL
JDPL is Damian Lalewicz — a developer with 16+ years of experience building web applications and software systems. We design, build and maintain bespoke web applications. We work in a compact model — you get a single point of contact, and we take responsibility for the whole thing: from architecture, through code, to deployment and maintenance.
We specialise in bespoke SaaS applications, multi-tenant platforms, online stores and custom CMS systems. Our flagship project — Terminarz24.pl — serves service businesses across many industries throughout Poland.
We work transparently: a defined scope, a defined quote, and the code is yours.
Solo developerMulti-tenant SaaSAI-augmentedFull-stack
What we do
From single-page sites to scalable SaaS platforms — we handle the whole thing.
Multi-tenant SaaS platforms
Scalable architecture, white-label, custom domains. For industries with a repeatable customer profile.
Websites & company landing pages
From single-page sites to full company portals. SEO, performance, accessibility.
Online stores
Custom-built e-commerce or built on proven engines. Integrations with payments, couriers, ERP.
Bespoke CMS systems
Admin panels and content management systems tailored to your process. No off-the-shelf compromises.
Integrations
Payments (imoje, Stripe), email/SMS, ERP/CRM, calendars, webhooks. Connecting systems that won't talk to each other.
AI-augmented development
We work with Claude Code, Gemini and GitHub Copilot every day as an accelerator. AI doesn't replace the engineer — it speeds them up. Every line ships to production after human review. The result: 2-3× faster time-to-market at the same (or higher) code quality.
Claude Code
AI-augmented IDE by Anthropic. Code review, refactoring and test generation live in the terminal.
Gemini
Google's AI for analysing large code contexts, technical documentation and debugging complex problems.
GitHub Copilot
Code completion as you type. Boilerplate and repetitive patterns — without hand-typing them.
Legacy system modernisation
An old PHP/Symfony + MySQL application? A PHP file from 2014 the whole team is afraid to touch? You don't have to rewrite from scratch. A phased migration via the strangler pattern — no production downtime, no "big bang rewrite". Experience: 10+ years working with PHP/Symfony, we understand both worlds.
01
Audit & plan
We map the structure, technical debt and risks. A phased migration plan with concrete milestones.
02
Strangler pattern
A new module alongside the old one. Traffic redirected gradually. The old app keeps running during migration.
03
Incremental migration
Feature by feature, module by module. Every step is reversible. No production downtime.
04
Legacy shutdown
Old system off, new database, documentation, monitoring. A clean break from the past.
10+ years working with the stack: PHP, Symfony, MySQL, Redis
Tech stack — from modern frameworks to legacy
We work in a modern stack, but we also understand the technologies most of the Polish web still runs on.
Next.js
TypeScript
PostgreSQL
Drizzle
Better-Auth
Tailwind
Docker
Coolify
PHP
Symfony
MySQL
Redis
Claude Code
Gemini
GitHub Copilot
Our flagship project: Terminarz24.pl
A multi-industry SaaS for online appointment booking for service businesses. Multi-tenant, our own infrastructure, payment integrations.
Multi-tenant architecture
Per-company isolation, custom domains, white-label.
Email + SMS notifications
ZeptoMail + JustSend.pl.
Online payments
imoje (ING).
SEO + blog for every industry
A complete marketing platform.
How we work together
Four steps from a conversation to a working system.
01
Conversation
30 min, no commitment. We listen to what you want to achieve and what's blocking you.
02
Quote & plan
A concrete range, timeline and scope. Everything in writing.
03
Iterative delivery
A working version every 2 weeks. You pay for what you see, not for PowerPoints.
04
Maintenance
We stay after launch. SLA, monitoring, changes. No disappearing.
Who we work with
SMBs with a process to digitise
Spreadsheets, paper, things done by hand.
Companies outgrowing off-the-shelf tools
They've outgrown ready-made SaaS and need something of their own.
IT teams without resources
Outsourcing a specific project instead of a full-time hire.
Got a project in mind? Let's talk.
30 min, no commitment. You'll get a concrete quote within 48h of the call.
Book a callFrequently asked questions
Let's talk
Tell us briefly about your project. We'll get back to you within 24 business hours.
Company details
JDPL Damian Lalewicz
32-082 Bolechowice, ul. Siedliski 12B
VAT ID (NIP): 8661653884
REGON: 369145787
Send me a message
Describe your project briefly — I'll get back to you within 24 business hours.