It has been a genuine pleasure working with Karol. Their ability to thoroughly analyze solutions and subsequently drive impactful improvements is truly commendable. What sets them apart is not just their technical prowess but also their collaborative spirit.

Anonymous

Head of Growth

MSc Information Technology

Having conducted a comprehensive audit of the current solution, I delved deep
into analyzing existing functionalities to craft an actionable improvement
plan. My expertise not only facilitated the design and development of novel
functions but also fostered a collaborative environment. Working hand in hand
with the Product Owner, CTO, and the backend team, we ensured a synergized
approach to our solution enhancement endeavors.  


Senior Backend Engineer

- Developed a new Nest.js backend with GraphQL microservices to replace existing Rails API
- Built a new Next.js web app from scratch, incorporating features present in the mobile app to ensure feature parity
- Developed and added several features to the React Native app, such as a user endorsement system, communities and a new messaging system
- Created AppCenter & fastlane pipelines to automate the deployment process of the mobile application
- Wrote unit & e2e tests for both backend and frontend
- Experience with debugging and troubleshooting production React Native applications (Sentry.io)


Fullstack Developer

- Developed the frontend layer of React Native & Next.js applications
- Operated within a rapidly evolving startup atmosphere while consistently delivering code within challenging project timelines
- Experience identifying and resolving React performance bottlenecks, optimizing applications for rerenders and correct usage of data fetching paradigms
- Worked in the Scrum methodology: Sprints, Demo, Retrospective, collaboration with the Project Owner and other Stakeholders.
- Utilized tools: JIRA, Confluence, Figma, Github.


Frontend Developer

- Implemented several features on both frontend (Next.js) & backend (RailsAPI), such as messaging system, user's online statuses, third party authentication with different providers (Facebook, Google)
- Utilized responsive web design techniques to ensure web app works smoothly across different devices and browsers


I have worked on the development of a React Native application calledInspotle
that included various features such as enabling users to create esports events
in their location, create teams, and other social media features.  

- Prepared initial frontend application structure, implemented typography, localization and reusable React components
- Wrote unit & e2e tests using Cypress and Testing Library
- Implemented bug-tracking tools (Sentry.io)


Partner with Pangea.ai & hire tech experts like Karol of DAC.digital. We deliver unparalleled experience & expertise to boost your team's performance.

Karol: DAC.digital Full Stack Developer | Pangea.ai

Developed an integrated auction platform for TB Auctions, unifying systems from multiple acquired e-commerce firms. Enhanced UX, maintained live system, and added new features per business needs.


Co-developed Muumap, a digital system to streamline traditional dairy practices. As a backend developer collaborated with client to enhance milk delivery and procurement processes.


Radosław S.

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