Slawomir Kosinski
Senior Full-Stack Engineer | Angular & NestJS
Salary / Daily rate
Cardiff, UK
Freelance, open to permanent contract
Can come onsite
Skills
Languages
About me
Intro
Senior Full-Stack Engineer with 10+ years specializing in Angular/NestJS and AI-assisted innovation. Built scalable web applications from scratch, reduced deployment time by 50% with CI/CD pipelines, and led teams of 60+ engineers. Expert in modern JavaScript ecosystem delivering high-performance solutions for UK tech market.
Work experience
shipshape.vc
Nov 2020 - Present
6 years
Cardiff, UK
Product Advisor
Nov 2022 - Present
4 years
Cardiff, UK
Skills: JSON Web Token (JWT) · NestJS · JavaScript · Bitbucket · RxJS · Angular · Angular Material · NgRx · Jasmine Framework · NoSQL · Pipelines · OAuth · MongoDB · Cascading Style Sheets (CSS) · Full-Stack Development · Amazon Web Services (AWS) · NodeJS · HTML5 · Node.js · Docker · TypeScript · Git · Jest
Senior Full-Stack Developer
Nov 2020 - Oct 2022
2 years
Cardiff, UK
• Designed and developed a web-based app and backend server from scratch. • Enabled customers to register and access a startup-focused investor search engine. • Integrated backend server with a proprietary RESTful API for seamless search functionality. • Designed a CI/CD pipeline using BitBucket and Docker, reducing deployment time by 50%. • Integration with: Signing in with LinkedIn, Google; Stripe
Frontend Developer
Crimtan
Apr 2023 - Oct 2023
7 months
Cardiff, UK
Software Architect, Full Stack Developer
Codiance Limited
Mar 2019 - Oct 2020
1 year 8 months
Greater Cardiff Area · On-site
• Continue designing and building a web app for creating and managing data forms. • Handled new types of data points, including images. • Improved form definitions stored in a database. • Extended Angular's Reactive Forms Module more. • Improved saving and loading forms' data working in real-time using websockets. • Designed a CI/CD pipeline using BitBucket and Docker.
Chief Software Architect, Full Stack Developer
Quasar Group Limited
Nov 2017 - Mar 2019
1 year 5 months
Cardiff, UK
• Designed and built a web app for creating and managing forms and collecting data. • Handled forms with thousands of data points, including validation and conditional rendering. • Stored form definitions in a database for easy access and management. • Extended Angular's Reactive Forms Module to achieve these goals. • Worked with Angular, Angular Material, NestJS, TypeORM, and MySQL.
Mobile Team Leader
SuperMemo World
May 2017 - Oct 2017
6 months
Poznań, Poland
• Development of Supermemo Android application. • Developed a multiplatform library in C++ that implemented the Supermemo algorithm. • Worked with Java, AngularJS, C++.
Omega Code Sp. z o.o.
Sep 2011 - May 2017
5 years 9 months
On-site
Strategy and Development Manager
Feb 2014 - May 2017
3 years 4 months
On-site
• Leading a team responsible for the Navigator app development for Provident (Android) • Sync dynamic data structures with the server and create dynamic data views • Build dynamic search and entry forms • Validate and process form data with JavaScript
Software Architect, Senior Mobile App Android & iOS Engineer
Feb 2013 - Jan 2014
1 year
On-site
• Designed and built an Android version of the Navigator app with Web Services communication • Designed and built a Hollo app (iOS) which allowed calling roadside assistance
Senior Mobile App iOS Developer
Jun 2012 - Mar 2013
10 months
On-site
• Designed and built a Navigator app (iOS) for Provident's DM to search and view customer data. • Developed a RRD Toolbox app (iOS) to calculate deals using server logic.
Chief Specialist of network & system maintenance
Sep 2011 - May 2012
9 months
On-site
• Picked out the best equipment and software for two server rooms, ensuring smooth operations. • Set up VMware Virtualisation, improving servers efficiency and performance. • Developed ITIL procedures, improving operations and service management.
Webtel Sp. z o.o.
Oct 2004 - Jul 2011
6 years 10 months
Warsaw, Poland
Software Architect & Engineer
Mar 2011 - Jul 2011
5 months
Warsaw, Poland
• Designed a platform to plan work schedules, register work time, and calculate consultant payroll. • Development of a call recording system for Alcatel's telephone exchanges. • Designed and built a tool for monitoring consultants' working hours in the Sytel system.
Board Advisor for Technology Platform
Oct 2010 - Mar 2011
6 months
Warsaw, Poland
• Implemented VMware virtualisation to enhance the scalability of servers. • Development of the server platform. • Development of the telecommunications platform.
Head of Business Unit
Jul 2009 - Oct 2010
1 year 4 months
Warsaw, Poland
• Leading a team of 60 engineers providing a complete IT service for three call center companies. • Maintenance of computer stations (over 1000 stations in 6 locations). • Manage the servers, networks and telecommunication infrastructure (2 server rooms, 40 physical servers with 230 virtual servers, and 3 telephone exchanges) • Support for the campaigns (preparing of script talks, loading/unloading databases)
Head of department for network & systems maintenance
Oct 2004 - Jul 2009
4 years 10 months
Warsaw, Poland
• Leading a team of DevOps engineers. • Maintenance of servers and network infrastructure. • Managing IT services for customers.
CEO and Owner
Sortie s.c.
May 1994 - Aug 2008
14 years 4 months
Warsaw, Poland
Ensuring the smooth delivery of IT and prepress services. Key clients include: • General Electric International, Lighting, and Power Controls; • Publishing houses Raabe and Vocatio; • Danje-Polymer.
Administrator and Specialist for network security
Call Center Poland S.A.
Oct 2000 - Oct 2004
4 years 1 month
Warsaw, Poland
• Designed and built a new internal network architecture based on zones. • Implementation of the first VoIP-based call centre in Poland. • Management of servers and networks.
Administrator of systems and databases
Univ-Net Sp. z o.o.
Oct 1998 - Oct 2000
2 years 1 month
Warsaw, Poland
• Administration of the servers and network infrastructure.
Education
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie
Environment Protection
1988 - 1990
2 years 1 month