• Built the production stack from scratch using Python, FastAPI, React and Typescript (Tauri desktop client), tailored to SaaS business model.
• Deployed a hybrid setup using AWS and bare-metal servers for heavy processing (lower CoGS).
• Set up the complete CI/CD pipeline (GitHub Actions), data ingestion workflows, coding standards and quality gates.
• Completed the core infrastructure build; the system is now operational.

tech used

• Python
• Prefect
• FastAPI
• Typescript
• React
• Esbuild
• Tauri
• RTL

• Designed and executed migration strategy (Strangler Fig pattern) to decommission a 30-year-old legacy monolith while maintaining system uptime.
• Defined the target cloud-native architecture on Azure, moving key system components from on-premise to cloud infrastructure.
• Built Proofs of Concept (PoCs) to validate integration points between the legacy core and the new Azure microservices.
• Acted as the technical bridge between business goals and engineering execution, managing roadmap expectations for a complex multi-year transformation.

tech used

• Typescript
• React
• Jest
• Esbuild
• RTL

• Orchestrated career paths for direct reports, facilitating upskilling and successfully guiding team members through the promotion process.
• Managed all aspects of the employee lifecycle, including performance evaluations, compensation planning, and availability (holidays/leaves).

approach

• mentoring
• compassion
• respect

• Led delivery teams of 6-10 engineers and led the Front-End Community of Practice (10+ members).
• Defined frontend architecture and established strict coding standards, enforcing compliance through quality gates, mentorship and peer reviews.
• Introduced a JSON-Schema based GUI generation engine, enabling rapid delivery and standardizing UI integration patterns.
• Spearheaded the adoption of TypeScript, significantly improving type safety and developer productivity.

tech used

• Javascript
• Typescript
• React
• Redux
• Webpack
• Jest

I led a 7-man scrum team. Green field project, a complex web application (React+Redux+Saga) for a Swiss customer from financial sector. My main responsibility is to ensure smooth delivery of business value by the team in a timely manner and appropriate quality. In order to do so, on a daily basis I:

• performed duties of key developer
• did peer reviews
• trained and coached my teammates
• ensured Scrum process is followed
• maintained and redact our documentation
• helped PO with backlog and decision making regarding product roadmap
• facilitated meetings with customer staff
• did technical interviewing for my employer and customer alike

tech used

• Javascript
• React
• Redux
• Webpack

As a front-end developer I was responsible for development and maintenance of components used across several applications (with React, Redux, Sagas). In addition to that, doing pull-reviews, advocating better coding standards, discussing with higher-ups possible solutions and coaching teammates in JavaScript. From time to time I also did technical interviews (front-end).

tech used

• Javascript
• React
• Redux
• Webpack

My biggest project in Kainos was development, in a Scrum team, of a Java EE Application with Angular Front-End for highly regulated healthcare industry. Due to the emphasis on the acceptance tests, very often I worked with development, testing and validation teams to provide best possible business value.

Later, I participated in SMART project. It is a tool responsible for automation of Workday configuration testing. Apart from maintenance and bugfixing (on the front-end), I did internal trainings regarding front-end development.

tech used

• Java
• Spring MVC
• Javascript
• Angular
• React
• Aurelia

My four-man team, was responsible for the core functionality of registering users and matching the students with available places, using rules in accordance with the Polish law and customers.

Personally, I was responsible for performing maintenance and developing new features for recrutation platform for Polish public schools (PZO Otago).

tech used

• Java
• PostgreSQL
• Hibernate
• JavaScript
• jQuery