Kacper Jakubowski, Developer in Warsaw, Poland
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Kacper Jakubowski

Verified Expert  in Engineering

Full-stack Developer

Location
Warsaw, Poland
Toptal Member Since
February 15, 2022

Kacper is a seasoned full-stack developer. He started his career at Nokia, working with C++, then he moved to Goldman Sachs, where he worked mainly with React and Java. At Goldman Sachs, Kacper played a key role as the team leader of a scrum team of 10 and as the technical lead for new initiatives. Currently, Kacper is working as a freelance professional while developing his own project, achieving significant experience in startups.

Portfolio

Lucra Systems LLC
Go, PostgreSQL, Apache Kafka, Swagger, Linux, Docker, Docker Compose...
Table Tap
React Native, Firebase, Google Analytics, TypeScript, JavaScript...
Vitag Interactive Technology Group Inc.
Firebase, React Native, Near-field Communication (NFC), Material UI, Next.js...

Experience

Availability

Part-time

Preferred Environment

Linux, Visual Studio Code (VS Code), IntelliJ IDEA, Bash

The most amazing...

...project I’ve been developing with my friends is a mobile app that has the potential to revolutionize dining in restaurants. The app is close to being released.

Work Experience

Back-end Developer

2022 - PRESENT
Lucra Systems LLC
  • Developed multiple microservices with Go language for a digital asset marketplace.
  • Integrated external bank APIs with internal systems.
  • Performed constant code reviews for other team members.
Technologies: Go, PostgreSQL, Apache Kafka, Swagger, Linux, Docker, Docker Compose, Web Security, API Integration, JSON, IT, Back-end Development, GitHub, CI/CD Pipelines, Microservices Architecture, Back-end Architecture

Co-founder

2020 - PRESENT
Table Tap
  • Conceived and built a mobile application in React Native.
  • Designed and developed back-end systems in Firebase.
  • Built the product from scratch, acting as a co-founder of the startup.
  • Created marketing strategies collaborating with team members.
Technologies: React Native, Firebase, Google Analytics, TypeScript, JavaScript, User Experience (UX), Localization, Mobile, Full-stack Development, User Interface (UI), Mobile Apps, Full-stack, Front-end, Front-end Development, Jest, Architecture, Cloud Firestore, Redux, Redux Thunk, Payment APIs, Databases, JSX, Expo.io, JavaScript Testing, Testing, Figma, Confluence, NoSQL, API Integration, JSON, Product Development, Mobile UX, Serverless Architecture, IT, GitHub, Mobile Development, CI/CD Pipelines, React Redux, Google Cloud Platform (GCP), Web & Mobile Applications, Front-end Design

React Native App Developer

2022 - 2022
Vitag Interactive Technology Group Inc.
  • Developed a React Native app with a Firebase back end for Android and iOS that allows NFC tag programming, content management, and video and image handling.
  • Finished multiple tasks using Trello as a Kanban board.
  • Developed Next.js web application deployed on Vercel.
Technologies: Firebase, React Native, Near-field Communication (NFC), Material UI, Next.js, Expo, NoSQL, JSON, Web Applications, IT, UI Testing, GitHub, Mobile Development, Web & Mobile Applications

Full-stack Developer

2021 - 2022
Telshur
  • Developed new features for a healthcare-related React web app.
  • Integrated new APIs in a server that was written in Go.
  • Introduced unit tests on an existing project that was completely test-free.
  • Collaborated with people all around the world in releasing new versions of software.
Technologies: JavaScript, React, Redux, Go, MySQL, Node.js, CSS, APIs, Google Sheets, Full-stack Development, User Interface (UI), HTML, Full-stack, Front-end, Webpack, Front-end Development, Jest, SQL, Material UI, Redux Thunk, SCSS, Web Development, Databases, Bootstrap, JSX, Docker, REST, JavaScript Testing, Testing, Single-page Applications (SPA), React Router, HTML DOM, JSON, Web Applications, IT, Back-end Development, UI Testing, GitHub, React Redux, Web & Mobile Applications

Associate Full-stack Developer

2019 - 2021
Goldman Sachs
  • Developed two separate React web applications, one for clients and one for agents.
  • Worked on the microservice back-end written in Java.
  • Built security systems designed based on the OWASP Top 10 standards.
  • Led the technology on new initiatives from the beginning to the end.
  • Managed a multinational scrum team of ten remotely.
  • Maintained a good collaboration between the product and development teams to balance the product-led approach.
  • Interviewed new candidates for software developer positions.
Technologies: Java, JavaScript, React, Redux, Jira, Team Leadership, Remote Team Leadership, Software Architecture, MongoDB, Apache Kafka, Estimations, Front-end, Back-end, Microservices, CSS, APIs, REST APIs, Full-stack Development, User Interface (UI), HTML, Full-stack, Front-end Development, Jest, Architecture, Redux Thunk, SCSS, Web Development, Databases, Swagger, Web Security, JSX, Spring Boot, Spring, REST, GraphQL, JavaScript Testing, Testing, Confluence, Single-page Applications (SPA), React Router, HTML DOM, Cypress, NoSQL, API Integration, JSON, Fintech, Web Applications, Technical Leadership, IT, Cryptography, Back-end Development, QA Testing, Integration Testing, UI Testing, GitHub, Content Management Systems (CMS), CI/CD Pipelines, Microservices Architecture, React Redux, Web & Mobile Applications, Back-end Architecture

Software Developer

2017 - 2019
Nokia
  • Developed boot software for BTS devices used all around the world.
  • Maintained the project in shape and fixed production bugs.
  • Performed multiple code reviews for colleague developers.
Technologies: C++, JavaScript, Python, Makefile, CMake, Git, Jira, Full-stack Development, Testing, IT, Back-end Development, GitHub

Marcus

http://marcus.co.uk
Marcus is a web app for online savings banking accounts. As a full-stack developer and the team leader of a team of ten, I was responsible for introducing new initiatives and features. I had the opportunity to introduce new security improvements and new types of investment accounts.

Table Tap

Table Tap is a React Native and firebase-based project that can revolutionize how we order food and drinks in restaurants and pubs. This app is designed for iOS and Android. I am one of the co-founders of this project and part of the software development team of five.

Telhsur

Telhsur is a communication platform for healthcare professionals where I was working as a full-stack developer. While developing new features, I introduced unit tests to the React app. I also was integrating new back-end APIs in a server written with Go.
2015 - 2017

Master's Degree in Mechatronics

Wrocław University of Science and Technology - Wrocław, Poland

2012 - 2015

Bachelor of Engineering Degree in Mechatronics

Wrocław University of Science and Technology - Wrocław, Poland

AUGUST 2022 - PRESENT

Blockchain Integrated Course Program

University at Buffalo and The State University of New York via Coursera

AUGUST 2022 - PRESENT

Blockchain Basics

University at Buffalo

AUGUST 2022 - PRESENT

Decentralized Applications (Dapps)

University at Buffalo

AUGUST 2022 - PRESENT

Smart Contracts

University at Buffalo

AUGUST 2017 - PRESENT

C++ Developer

Nokia Academy

Languages

JavaScript, Java, TypeScript, Go, CSS, HTML, SCSS, Bash, C++, Python, SQL, Solidity, GraphQL

Frameworks

Redux, React Native, Jest, Cypress, Material UI, Truffle, Bootstrap, Swagger, Spring Boot, Spring, Next.js

Libraries/APIs

React, React Redux, Node.js, REST APIs, React Router, Web3.js

Tools

JSX, Git, Redux Thunk, JavaScript Testing, Confluence, GitLab CI/CD, IntelliJ IDEA, Makefile, CMake, Jira, Google Analytics, Mattermost, Google Sheets, Webpack, Remix IDE, Expo.io, Figma, Expo, Docker Compose, GitHub

Paradigms

Unit Testing, Microservices, REST, Testing, HTML DOM, Mobile Development, Microservices Architecture, Automation, Scrum, Agile, Serverless Architecture, Mobile Design, UI Design, Back-end Architecture

Storage

JSON, Cloud Firestore, Databases, NoSQL, MongoDB, MySQL, PostgreSQL

Other

Software Development, Front-end, Full-stack Development, User Interface (UI), Full-stack, Front-end Development, Web Development, Single-page Applications (SPA), Web Applications, IT, Back-end Development, Software Design, Estimations, Back-end, APIs, Localization, API Integration, Product Development, CI/CD Pipelines, Web & Mobile Applications, Software QA, Team Leadership, Remote Team Leadership, Software Architecture, User Experience (UX), Mobile Apps, Architecture, Payment APIs, Smart Contracts, Bitcoin, DApps, Web Security, Near-field Communication (NFC), Fintech, Technical Leadership, Mobile UX, Cryptography, QA Testing, Integration Testing, UI Testing, Content Management Systems (CMS), Front-end Design, Proof of Concept (POC)

Platforms

Linux, Visual Studio Code (VS Code), Software Design Patterns, Firebase, Mobile, Apache Kafka, Blockchain, Ethereum, Hyperledger, Docker, Google Cloud Platform (GCP)

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