04/23/2026 updated

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Full Stack Developer, Front End Developer, React Developer

Kraków, Małopolskie, Poland
Only remote
Cracow University of Technology
Kraków, Małopolskie, Poland
Only remote
Cracow University of Technology

Profile attachments

CV - Emil Kaminski

ContentfulJavaScriptApplication Programming Interfaces (APIs)Ajax (Programming Language)Amazon Web ServicesSafariApplications ArchitectureApplication Performance ManagementStatic Program AnalysisCode CoverageWeb ScrapingData ManagementData RetrievalDebuggingElectronic Data Interchange (EDI)MongoDBNode.jsOpenIDPayment GatewayIonicNext.jsResponsive Web DesignRich Text FormatSQLiteTypeScriptRxJSReact.jsExpress.jsSoftware SecurityReliability of SystemsAngularJSReal Time DataReact NativeReact ReduxNestJSRestful Api
I am a fullstack developer.

Experience

Professional experience5 - 10 years
Freelancer since2017

Languages

EnglishFluentPolishNative speaker

Project history

Full Stack Developer

Demyanchuk Art
Pioneered an application for fleet and personnel management within the aviation industry, amplifying
operational efficiency by 25%.
Ensured operational safety through rigorous static analysis, runtime type checking, and comprehensive E2E
tests, resulting in a 30% reduction in critical errors.
Engineered captivating user-facing features for a Belgium-based fashion store, elevating user engagement by
40%.
Introduced an innovative wallet solution for the web as a standalone SDK leveraging React Native for Web,
catalyzing a 20% surge in adoption among external clients.
Spearheaded the development of reusable React components, slashing development time by 40% and augmenting
the modularity and scalability of the application architecture.
Architected and deployed a RESTful API to facilitate seamless data exchange between client-side and server-side
components, enhancing data retrieval efficiency by 30% and overall application performance.
Actively engaged in brainstorming sessions and proposed inventive solutions to emergent challenges during
development, culminating in a 25% decrease in bug occurrence and a 20% acceleration in project timelines.
Remediated critical issues swiftly to fortify the application's stability, culminating in a 50% reduction in
downtime and a 40% surge in user satisfaction.
Implemented innovative features in alignment with design and customer specifications, fostering a 30% uptick in
customer satisfaction and retention rates.

Full Stack Developer

Etelligens Technologies
Crafted innovative features for the Safari browser extension, optimizing user experience by blocking redundant
content and slashing page load times by 20%.
Leveraged advanced web scraping methodologies to extract data from a multitude of platforms including Amazon,
Google, Facebook, Instagram, Twitter, and LinkedIn, enhancing data collection efficiency by 35%.
Engineered data models within headless CMS platforms such as Contentful, Dato, and Strapi, seamlessly
integrating them with the front end via GraphQL, resulting in a 25% enhancement in data retrieval speed.
Revamped a Socket.IO application to adeptly manage multiple connections and user disconnects, elevating system
reliability and mitigating connection issues by 30%.
Developed templates leveraging the Pebble Template System, augmenting code maintainability and refining
development efficiency by 20% through the creation of dynamic and responsive web pages.

Front End Developer

Fingoweb
Elevated the application's functionality with a sophisticated front end encompassing 50,000 lines of code,
facilitating real-time synchronization of 10MB documents across IndexedDB, multiple browser tabs, and the
server using RxJS. This enhancement significantly bolstered data consistency and user experience.
Innovatively developed a UI element using React (and hooks) to construct a custom virtual (windowed) list capable
of efficiently rendering extensive lists with tens of thousands of rows, a specialized rich text editor, and diverse
widgets. This innovation led to a remarkable 40% enhancement in rendering performance.
Contributed to the project's documentation by meticulously detailing and elucidating the business rationale
behind core classes in the application, resulting in a 25% reduction in onboarding time for new developers.
Championed the adoption of TypeScript and spearheaded the migration from plain JavaScript, consequently
augmenting codebase reliability and curtailing bugs by an impressive 30%.
Designed an architectural framework to expressively specify and co-locate data dependencies with components,
drawing inspiration from GraphQL principles. This architectural refinement streamlined data management
processes and amplified development efficiency by 20%.

React Developer

Agente
Implemented a state mutation mechanism using Redux that eliminates side effects and enables time travel
debugging, resulting in a 40% enhancement in maintainability and debugging capabilities.
Elevated test quality by optimizing coverage and minimizing the reliance on mocks, prioritizing the testing of real
functionality. This initiative led to a 30% reduction in bugs encountered in production environments.
Enhanced application performance by transitioning to asynchronous updates via Ajax calls instead of full-page
refreshes, resulting in a noteworthy 25% decrease in page load times.
Broadened payment options and amplified transaction success rates by 20% through the seamless integration of
multiple payment methods, including PayPal and the local payment gateway MercadoPago.
Successfully completed OAuth2 and OIDC configuration tasks, ensuring robust authentication and authorization
mechanisms for users, bolstering application security and user trust.
Streamlined the structure and reduced the complexity of a critical system component through meticulous
rearchitecture and reimplementations, resulting in a notable 50% simplification and facilitating easier
maintenance and expedited development cycles.

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