Backend
- PHP 8+
- Symfony 7 (Messenger, Doctrine)
- Laravel
- REST APIs
- RabbitMQ
- legacy Symfony 3.4
Did every framework upgrade of my system myself: from Symfony 5.3 / PHP 8.0 to Symfony 7.4 / PHP 8.5.
Paweł Maj
Solutions architect and technical leader
For 15 years I have been turning business problems into systems that keep growing for years. I start by understanding the domain, fit the architecture to the scale and to the team, then lead people through building it — to production and beyond.
- 15 years of experience
- technical leader
- remote
final class StartOnboardingHandler
{
public function __construct(
private ProcessRepository $processes,
private MessageBusInterface $bus,
) {}
public function __invoke(StartOnboarding $command): void
{
$process = Process::start(
$command->employeeId,
$command->template,
);
$this->processes->save($process);
$this->bus->dispatch(new ProcessStarted($process->id()));
}
}Skills
Backend is where I go deepest, but I deliver whole features — from the domain model to the deployment config.
Architecture
- DDD
- CQRS
- Event Sourcing
- Event Storming
- modular monolith
- microservices
- SOLID
- TDD
Designed a DDD/CQRS workflow engine from scratch and co-designed a monolith-to-36-microservices migration.
Frontend
- React 18
- Next.js
- TypeScript
- React Hook Form
For the last 18 months I have delivered the frontend of my features in the admin panel; my own products I build in Next.js.
Databases
- PostgreSQL
- MySQL
- MongoDB
- Redis
- Elasticsearch
- Doctrine
- Prisma
30+ databases in a microservice architecture, every service owning its database and its own copy of the data.
Testing & quality
- Behat
- PHPUnit
- PHPStan
- PHPArkitect
- PHP CS Fixer
- ESLint
- Jest
Introduced Behat as the team’s testing standard — the suite has grown to 2,300+ scenarios.
Infrastructure & CI/CD
- Kubernetes (manifests, kubectl, k9s)
- Docker
- Azure (AKS)
- AWS (ECS/EKS, RDS, Lambda)
- OVH
- Bitbucket Pipelines
- GitHub Actions
- GitLab CI
I write the Kubernetes definitions with the feature — a change ships with its deployment config in the same pull request.
AI-assisted development
- Claude Code
- Codex
- custom skills
- MCP integrations
- AI-assisted refactoring and tests
Brought Claude Code into the team’s daily flow: skills for the Jira → branch → pull request → review cycle.
Languages: Polish (native), English B2 — day-to-day written technical communication, calls with US clients
Case studies
The most interesting problems I have solved. No company names — what matters is what I did and how.
A modular monolith on DDD and CQRS
The HR workflow engine of a SaaS onboarding platform — pre-boarding, onboarding and offboarding for ~170 client applications.
My role: architect and main author
- Designed the system from an empty repository as a modular monolith: modules with their own domain, boundaries and layers enforced automatically by PHPArkitect.
- Separated writes from reads (CQRS) and built a mechanism of asynchronous command handlers — heavy operations go through a queue instead of blocking user requests.
- Scheduled actions, deadlines, reminders and alerts run as domain events, so new process steps are added without touching existing ones.
- Behat as the testing standard for every feature; the system went through every upgrade from Symfony 5.3 / PHP 8.0 to Symfony 7.4 / PHP 8.5.
Result: 7,000+ commits and 2,300+ Behat scenarios; a six-person team develops it today.
AI as a service in the product
Features built on language models — for the platform’s clients and for the company’s employees.
My role: designer and builder
- Survey question generation from materials provided by the client: upload the documents, get a ready set of questions to review.
- An internal chatbot loaded with the company wiki — every employee can ask a question and get an answer grounded in the company’s documentation.
- An MCP server opening the platform’s API to AI assistants: per-client access and refresh tokens, an admin-side switch.
From a monolith to 36 microservices
An ad-buying platform for third-party advertising networks that crashed daily at 50k daily active users.
My role: tech lead
- Co-designed with the CTO the migration of a Laravel monolith to 36 autonomous services (PHP, Java, Python); my team owned 16.
- Asynchronous communication over RabbitMQ, every service owning its database and its own copy of the data; synchronous APIs only where money was involved.
- ~120 service instances and 30+ databases: Elasticsearch for matching, MongoDB for statistics, Redis, ELK.
- One of six tech leads while the team grew from 6 to 30.
Result: From 50k to 3 million daily active users.
A platform clients configure themselves
The same SaaS platform — client HR teams model their own processes in it without engineering work.
My role: data model designer
- Data model for custom fields and forms, custom reports, document access rules, employee segments, events and meetings.
- The integrations the business runs on: Stripe billing (subscriptions, payment links, webhooks), HubSpot CRM, SMS delivery.
- The frontend of these features in the React 18 and TypeScript admin panel.
AI-assisted development in the team
A product team of 8–10 engineers.
My role: initiator and tool author
- Brought Claude Code into the team’s daily work.
- Wrote the skills for the Jira → branch → pull request → review cycle.
- Co-wrote the per-module CLAUDE.md documentation so the agent follows the architecture and testing rules.
Result: The team adopted the skills as its standard way of working.
A team and CI/CD from scratch
An employee onboarding and engagement PWA for a Polish client.
My role: team lead
- Led two backend developers, a frontend developer and a tester; Symfony backend, React frontend.
- Built CI/CD in Bitbucket Pipelines: build, PHPUnit, PHPStan and PHP CS Fixer on every commit.
- Deployment to dedicated servers gated on a green pipeline.
I have also worked on
- an equipment-rental tracking system for a US construction-machinery client (frontend)
- systems supporting debt-collection processes (tech lead)
- systems supporting brokerage of credit and insurance sales
- driving-school services, a diet configurator and children’s games for Android
- software for city information kiosks
VibeAudit Audits of apps built with AI
Paweł Maj — I created this service and run every audit myself.
Your app was built in a few days. I check it before someone else does.
Lovable, Bolt, Replit, Cursor, Claude Code — they get an app live fast, but nobody looks at where the database sits, who can see the secrets, or whether the login can be bypassed. I review the code and infrastructure against 85 checkpoints in 8 areas, based on OWASP Top 10 and ASVS.
Every finding is verified in the code before it goes into the report. You pay for a senior’s judgement: what actually affects you, what is dangerous today and what can wait.
Included
- report in HTML and PDF
- 30-minute call about the results
- one retest within 30 days
- a sample CI/CD pipeline for your repository
Fixed price from 599 PLN, agreed before work starts.
See the offer on vibeaudit.plThe service and its site are in Polish, for clients in Poland.
Contact
A project, a role, an audit or just a question — I usually reply the same day.
- Phone
- +48 515 558 789
- linkedin.com/in/majpawel
- Where
- Wrocław, Poland — remote