Solutions & Integration Engineer
I connect business software, data, and external services so everyday work becomes faster, safer, and less manual, from the first problem description to deployment and support.
01 / Expertise
You explain what needs to work. I find the systems involved, build the connection, put it into production, and remain responsible when something fails.
Before: people copy the same data between applications or work around systems that do not communicate.After: the applications exchange the right data automatically through APIs, databases, or files.
Before: when something fails, it is unclear whether the cause is code, a container, a database, or the network.After: the system is monitored, backed up, and easier to diagnose and restore.
Before: manual steps and old code make every change slow and risky.After: repeatable automation and tests make work faster and changes safer to release.
02 / Selected work
These examples explain what was difficult, what I changed, and what now works. Private client code and business data stay private; only verified evidence is shown.
Legacy system · Anonymized
Before: important business rules were spread across old PHP code, database rules, and scheduled jobs. Even a small change could break another process.After: I mapped the risky parts, removed obsolete files, and added automated tests, repeatable database changes, Docker services, and two controlled deployment environments. Changes can now be checked before release instead of relying only on manual testing.
Measured evidence
396 automated tests · 1,108 checksClient data import · Anonymized
Before: every company sent CSV, XLS, or XLSX files with different columns and layouts. A new layout could stop the import and require a programmer to change the code.After: I built one import process that maps each file into a common structure, lets an operator correct the mapping, and remembers successful layouts for later imports. A bad row is logged instead of stopping the whole file, and the job can be stopped and resumed. If the company identity is uncertain, AI can suggest the most likely match, but a person must approve it before sensitive data is saved.
What now works
Client file → mapping → common formatPolish e-invoicing · Anonymized
Before: the legacy PHP system could not communicate directly with Poland's National e-Invoice System (KSeF), which requires newer authentication and invoice formats.After: I added a separate Python service that converts invoice data to FA(3) XML, authenticates with KSeF, sends invoices, checks their status, and finds an invoice submitted earlier. The old system can now use KSeF without a risky rewrite of the whole application.
What now works
Legacy PHP → Python service → KSeFLoyalty-card platform · Public source
Before: I designed and wrote the first version from scratch for one business. It handled customer registration, physical cards, Dotykačka customer synchronization, Wallet cards, and email, but all customers, settings, and integrations belonged to one setup.After: I then developed it into a Django platform that keeps every business separate. A customer scans a physical card; the system assigns it, records consent, synchronizes the customer with Dotykačka, prepares a personal Apple Wallet or Google Wallet card, updates Brevo, and sends the card by email. Each business has separate branding, inventory, users, and encrypted integration credentials. If an external service fails temporarily, background jobs can retry safely.
What now works
267 customer records preservedETHWarsaw 2024
CoinSwipe is a Telegram app that combines discovering memecoins, trading them, and meeting people interested in the same coins. I built it with my team during ETHWarsaw 2024; we won first place in the DragonSwap bounty, and 42 Warsaw later featured the project.
HumanTech Hack 2024 · Team Warsaw Moss
Before: route planners mainly compared time and distance.After: Eco Navigate compares walking and cycling routes through Warsaw using data about nearby trees, parks, and other green areas. It recommends a greener option while showing its distance, time, and extra detour, and it also displays live air-quality stations.
03 / About
I work where software, servers, data, and day-to-day business operations have to work together.
My engineering work covers Python and PHP applications, APIs, SQL, Linux, Docker, production problems, and legacy modernization. Nine years of running my own e-commerce business taught me to judge technology by whether it saves time, reduces risk, and works reliably, not by whether it is new.
I am most useful when the starting point is unclear, several systems must exchange data, and someone needs to take responsibility from the first discussion through production support.
04 / Mentoring
As a Space Eagle at 42 Warsaw, I mentored new participants during the four-week Piscine, an intensive, on-campus introduction to peer-to-peer and project-based learning. I helped them reason through problems and find their own next steps. My experience also includes mentoring at HackYeah 2026.
See my mentoring approach
05 / Toolkit
Python · PHP · JavaScript · FastAPI · Django · Flask
REST APIs · Webhooks · SQL · ETL · CSV / JSON / XML
Linux · Docker · Proxmox · CI/CD · Logging · Backups
PostgreSQL · MySQL · Redis · Validation · Data mapping
AWS · Terraform · Kubernetes · Observability · AI evals
Discovery · Architecture · E-commerce · Mentoring · Ownership
