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Michel Szczesny
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Développeur Full stack
Paris
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À propos
Michel Szczesny
Fullstack Developer JS/TS/React/Node
Développeur Full stackParis
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Description

Full Stack JavaScript / TypeScript developer with 8 years of experience, I have worked on high-impact projects (React, Node.js). Passionate about code quality, I enjoy tackling technical challenges while contributing to product evolution and best development practices.

Expériences professionnelles
8 ans d'expérience en tant que Développeur Full stack (ou similaire)9 ans ans d'expérience dans d'autres domaines
Software Engineer
Inter Mutuelles Assistance (via RS2i / byGecko) - Niortsept. 2018 - janv. 2022 · 3 ans 4 mois

JS / React / Redux / Node / Express / Jest / Enzyme / Storybook

  • Rebuilt from scratch a legacy application into a web-based platform for assistance management within a 10-person feature team (3 JS devs, 3 SAP devs, 1 PO, 1 Scrum Master, 1 Tester, 1 BA).

  • Initially developed the front in SAPUI5, then migrated to ReactJS (class and function components).

  • Managed application state with Redux, consumed REST services via a BFF (Node.js / Express), aggregating and mapping data while applying business rules.

  • Implemented unit tests (Jest / Enzyme) and tested APIs with Postman.

  • Performed bug analysis and resolution during functional and business testing.

  • Promoted best practices: multi-level code reviews, pair programming, creation of an inter-team “JS Guild”, and technical workshops.

Lead JS Developer responsibilities:

  • Onboarded and mentored developers

  • Acted as technical point of contact with other teams

  • Guided the team on technical decisions and improvement initiatives

Senior Software Engineer
Canal Plus (via Kaibee / Objectware) - Puteauxfévr. 2022 - aujourd'hui · 4 ans 1 mois

JS / TS / React / Redux / RXJS / Jest / React Testing Library / Gitlab

  • Developed the Canal app for Smart TVs, STBs, and ISP set-top boxes within a 10-person feature team (6 JS/TS devs, 1 TL, 1 Proxy PO, 1 Architect, 1 Tester).

  • Built the core application layer using ReactJS, TypeScript, RXJS, including UI components, state management (Redux, RXJS), and micro-frontend orchestration.

  • Consumed REST and GraphQL APIs and integrated with device middleware.

  • Ensured code quality and reliability via unit tests (Jest, React Testing Library) and debugging across multiple devices and browser versions.

  • Developed new features, integrated the app on new devices, and implemented technical improvements focusing on performance and scalability.

  • Worked on a high-traffic product with a real impact on millions of users.

  • Collaborated daily in English with international teams, including partners and device middleware teams.

Lead Dev responsibilities:

  • Onboarded and mentored team members; served as a technical point of contact within the team and across squads.

  • Collaborated with a tech lead on defining and executing technical improvement initiatives and architectural projects.

  • Scoped technical tasks, created tickets, and drove key topics to unblock the team.

Senior Software Engineer
Kaibee / Objectware - Gentillyfévr. 2022 - aujourd'hui · 4 ans 1 mois

Internal Project

TS / React / NextJS / Prisma ORM / MongoDB / AWS Cloud

  • Developed from scratch a mobile-friendly web application to engage visitors at Kaibee’s trade show booth (email registration and quiz for prize draws).

  • Initially worked in a volunteer team, then in a 2-developer team collaborating closely with the communications manager.

  • Built the application in React / NestJS (full TypeScript) with a MongoDB + Prisma ORM backend.

Migrated the app to Next.js for serverless deployment on AWS Lambda.

Deployed the application using AWS Amplify and continuously implemented new features.

Junior Software Engineer
Info Courses Pro (via RS2i) - Levallois-Perretjuil. 2018 - sept. 2018 · 2 mois

Java / Apache Camel / BeanIO /PostgresSQL

  • Worked on enhancements to a web application managing horse racing data flows.

  • Processed new data streams, integrated them into the application, and added new features using Java, Apache Camel, and BeanIO.

  • Developed and maintained stored procedures in PostgreSQL.

Formations
5 ans d'études supérieures
AFPA
RNCP Concepteur Développeur Informatique (Level II, Bac +4) 2018
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Technologies
Compétences
Interessé parI'm also interested in AI and machine learning
Langues
  • Français
  • Polonais
  • Anglais
  • Portugais
  • Espagnol
Tests
React ⚛️ - 15 mars 2025Top 1% avec un score de 2683 points