Legacy rescue project for Abu Dhabi-based real-estate management SAAS with fixed budget, with the aim to improve the state of the application to the point it would pass investors' technical due diligence and to educate client staff.

• Configuration management for the whole application
• Observability/telemetry & debugging tools for event-driven part of application
• Proper resource setup and teardown, to reduce notorious memory leaks
• Enforced authentication/authorization invariants
• Migration of audit trails & solving the issue that led to uncontrolled growth of stored data

Part of Agent Enablement and Underwriting teams.

• Led a large data migration project aimed at filling the gaps in our lead data in Salesforce, involving fuzzy matching 100s of thousands of entries from our data lake to Salesforce without any reliable common keys. The achieved project goal was to increase throughput of lean customer support and sales teams, which needed to fill those gaps manually before using tools external to their typical process.
• Architected redesign of Underwriting Domain to provide observability of our automated decision-making process and speed up introducing new products and markets.
• Partook in smaller projects aimed at improving the productivity of our sales agents.

Scaffolding of the MVP for a contractee team.

• Worked with business to define domain & map it to the database and GraphQL API design.
• Set up CI and toolchain for backend development & testing.

One-month contract. Haven't extended because of a more permanent proposition from SwingDev.

• Created backoffice APIs, React-based SPA admin panels, and part of analytics for a mobile game, and its web-based prototype
• Built infrastructure for testing, and convinced the team to adopt the same approach for the rest of the project
• Coached junior developers

The contract was cut short because the company pivoted. In March 2024 I received an offer to jump back onboard.

Greenfield project, layered architecture, CQRS, DDD, TDD.

• We built from scratch a working multi-tenant affiliate platform on top of the Amazon Attribution program, before appropriate APIs were even available and a backoffice for parts of the process that could not be automated
• Built a BDD-like domain-specific testing solution allowing for fast writing human-readable integration/E2E tests, as our need for safety outgrew what we could get away with during prototyping, before the onboarding of the first paying and getting-paid customers
• In addition to backend/domain work, I've set up our frontend architecture, which provided a Stimulus-like experience for our frontend developers, after we decided against a SPA frontend
• Performed some light DevOps and security-hardening tasks

• Led the process of bringing in-house previously outsourced software
• Built Docker and GitLab-based CI for the company
• Offloaded long-running workloads to queue
• Introduced automated testing
• Unified seven different customer panels into one project—maintenance and QA were killing us
• Greatly improved UX of the customer journey and automatic valuation process
• Integrated multiple payment systems and CAT software

• I convinced my - now friends - then acquaintances to employ a mostly-PHP and JavaScript developer to do Python. They didn't regret this decision. A month later I was contributing on par with my peers.
• Moved legacy PHP supporting systems and almost 3 years' worth of data to our main Python-based infrastructure
• We built a mostly React-based customer journey that provided both great UX and gathered every possible bit of data that could help our sales, which we fed to our CRM and marketing automation

Company dissolved, as we were unable to secure another round of financing.

Business impact

• Added millions of missing pieces of content—lost after previous CMS migration—back to search engines' index
• Removed discrepancies in our analytics falsifying traffic reports
• Improved uptime/availability of our main property from around 97.6% to 99.4%
• Improved loading times for our customers and their consistency by an order of magnitude
• Reworked our advertising system to allow new ad formats and better experience for our customers
• The whole process improved our traffic and unique users numbers by around one third

Technical impact

• Migrated the company from FTP deployment and SVN to Git and on-premises GitLab for the deployment process
• Banned FTP access to production. I built and maintained GIT<->SVN bridge for the transition period
• Understood, fixed our implementation and documented a badly misused and misunderstood caching system
• Introduced automated testing and proper telemetry
• Increased template and code reuse by orders of magnitude
• Replaced an assorted collection of PHP 5.2.17 (version enforced by vendor) scripts augmenting our legacy CMS, by self-built Symfony-inspired light framework enabling us to introduce automated testing and creation of Vagrant-based local environments for developers
• Replaced template-embedded frontend scripts with a proper build process and React-based components

• Took over after the software house failed to deliver both in terms of features and quality and built our product from scratch just in time to meet our investor's roadmap
• Built a visual "no-code" landing page builder for our marketing with A/B testing capabilities, adapted to manage the whole website by our non-technical staff
• Integrated content-marketing/sales part with our custom CRM and call center
• Set up our payment system
• Supported the project during its lifetime as a sole developer/ops engineer

• As a team, we built and maintained a framework allowing for ultra-fast delivery of customized, feature-complete WordPress websites for Scandinavian businesses
• Built an internal application automating the generation of SEO reports used by our sales team
• Took part in cleanup and hardening efforts after two separate security incidents

Building, adding features, and maintaining various websites, WordPress plugins, and themes.

Occasional migration from Joomla or custom solutions to WordPress.

Writing for multiple internet media entities, including o2 sp. z o.o. (currently: Grupa Wirtualna Polska), Antyweb and the Polish edition of PC World Computer about IT-related and unrelated topics.

Working as an editor/managing editor in two big blog networks.