Solutions & Integration Engineer
I turn unclear business needs into sound technical decisions and reliable production systems. I stay hands-on while helping others understand the problem, compare options, and move forward independently.
01 / Expertise
I clarify the business goal, identify the technical dependencies, build and operate the solution, then document decisions and share context so the team is not dependent on one person.
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: critical business rules were spread across legacy PHP, database rules, and scheduled jobs. A small change could break an unrelated process.After: I mapped the dependencies, removed obsolete files, and added automated tests, repeatable database changes, Docker services, and two controlled environments. Changes can now be verified before release.
Measured evidence
396 automated tests · 1,108 checksClient data import · Anonymized
Before: each company sent CSV, XLS, or XLSX files with different columns. A new layout could stop the import and require a code change.After: one importer maps files to a common structure, lets an operator correct the mapping, and remembers successful layouts. Invalid rows are logged without stopping the job, and imports can resume safely. AI may suggest an uncertain company match, but a person approves it before sensitive data is saved.
What now works
Client file → mapping → common formatPolish e-invoicing · Anonymized
Before: the legacy PHP system could not meet KSeF's authentication and invoice-format requirements.After: I added a Python service that creates FA(3) XML, authenticates, submits invoices, checks their status, and finds an earlier submission. The legacy system gained KSeF support without a risky full rewrite.
What now works
Legacy PHP → Python service → KSeFLoyalty-card platform · Public source
Before: I designed and built the first version from scratch for one business, combining registration, physical cards, Dotykačka, Wallet cards, and email in one setup.After: I developed it into a Django platform that separates each business's data, branding, users, card inventory, and credentials. It automates card assignment, consent, Dotykačka synchronization, personal Apple or Google Wallet cards, Brevo, and email. Retryable jobs handle temporary service failures.
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 systems, daily business operations, and people need to move in the same direction.
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.
My approach is hands-on. I clarify the goal, design and implement the solution, explain the choices and their consequences, and use questions and feedback to help others make sound decisions independently.
04 / Mentoring
As a Space Eagle at 42 Warsaw, I mentored new participants during the four-week Piscine. At HackYeah 2026, I mentored participants and served as a judge in the Defence category. One of the teams I mentored won the event’s grand prize. I also presented the Defence category award on stage on behalf of the jury. In mentoring, I use questions and feedback to help people reach their own decisions instead of taking over their work.
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 · Business context · Mentoring · Shared ownership
06 / Contact
