TypeScript NodeJS NestJS React Software Product Engineer
Aktualisiert am 09.09.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 09.09.2025
Verfügbar zu: 100%
davon vor Ort: 0%
Node.js
TypeScript
AWS
GraphQL
JavaScript
Nodejs
Nestjs
MongoDB
PostgreSQL
Apache Kafka
Redis
React
Frontend-Developer
elasticsearch
Agile Entwicklung
Financial Services
BackEnd
Svelte
Python
ENGLISH
C2
GERMAN
Mother tongue(s)
JAPANESE
Speaking, Reading C1 / Listening C2 / WRITING B2
LATIN
A1

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

5 Jahre 11 Monate
2020-01 - heute

Kraenz Software Development (self-employed)

FREELANCE WEB DEVELOPER AWS serverless TypeScript ...
FREELANCE WEB DEVELOPER

Zwei veröffentlichte Apps im Google Playstore: https://play.google.com/store/apps/developer?id=Mirco+Kraenz

Coding Streamer on Twitch: https://www.twitch.tv/typescriptteatime

Github: https://github.com/mkraenz

For all my projects, see https://linktr.ee/mkraenz

AWS serverless TypeScript Node.js
Kraenz Software Development (self-employed)
10 Monate
2024-05 - 2025-02

LiveEO GmbH

Full Stack Engineer (Backend-focused) TypeScript NodeJS NestJS ...
Full Stack Engineer (Backend-focused)
Re-contracted to work on previous project "TradeAware" with larger team (~15 people).

Selected responsibilities

- Design and implementation of Questionnaire and File Upload solution with Enterprise-grade security
- Programmatic access to a Public API using OAuth 2.0 & Auth0
- Permissions system for access to Paid Features, including guiding the cross-department design of Enterprise User Onboarding
- Mentoring
TypeScript NodeJS NestJS PostgreSQL React Nx Monorepo Lokalise Mantine UI Mapbox SurveyJS HubSpot AWS S3 AWS Lambda AWS App Runner AWS RDS AWS Eventbridge AWS CloudWatch AWS GuardDuty GitLab CI Netlify Auth0
LiveEO GmbH
1 Jahr 4 Monate
2023-03 - 2024-06

GIFTD GmbH

React Native Developer React Native Redux RevenueCat ...
React Native Developer
Selected Responsibilities:

- Paid Subscriptions Setup with RevenueCat + Apple App Store + Google Play Store
- CI/CD setup
? React Native development for mobile app incl. migration to TypeScript and modernizing tech stack to improve quality and time-to-market of new features
? Continuing consulting from time to time (state Nov 2024).

Special Achievements:
- Time spend on releasing down from 4+ hours to 10 minutes!

 ? Redux ? RevenueCat ? Mixpanel ? TypeScript ? JavaScript ? Serverless Functions ? Firebase ? NoSQL (Firebase Realtime DB) ? GitHub Actions ? Google Play Store ? Apple App Store
React Native Redux RevenueCat Mixpanel TypeScript JavaScript Serverless Functions (GCP) Firebase NoSQL Firebase Realtime DB GitHub Actions Google Play Store Apple App Store
GIFTD GmbH
6 Monate
2023-06 - 2023-11

LiveEO GmbH

Full-Stack Engineer (Backend-focused)
Full-Stack Engineer (Backend-focused)
Full software architecture & design and implementation of MVP for new Supply Chain Compliance solution TradeAware to protect our world's forests and biodiversity in the context of the European Union Deforestation Regulation (EUDR).

LiveEO GmbH
5 Monate
2021-11 - 2022-03

Miralytik Healthcare Consulting GmbH

Software Engineer und Framework-Mentor TypeScript Node.js Svelte ...
Software Engineer und Framework-Mentor

MedTech startup building a web-based Benchmark Tool to compare Hospital performance


Role 

  • Technical expertise and mentoring on NestJS and related technologies 
  • Digitalization of Business Workflow to manage complex Data Access Permissions 
  • Implementation of token-based Authentication and role-based Authorization 
  • Development of Automated Testing Strategy on GraphQL API-level


Tech stack

  • FE: Svelte, Apollo GraphQL, Svelte Material UI, TypeScript, Jest, Cypress
  • BE: TypeScript, Node.js, NestJS, Jest, PostgreSQL, Apollo GraphQL
  • Architecture: Domain-Driven Design (DDD), NestJS-style layered architecture
  • DevOps: Docker, Continuous Deployment on Platform.sh, GitHub Actions


Achievements

  • Guide Product Decisions on the way to MVP release using Golden Path & Value stream mapping
  • High quality code with only a handful of issues identified by QA testers while keeping daily Pull Requests
  • Successfully mentored team to effectively handle NestJS including points to watch out for
TypeScript Node.js Svelte Agile Softwareentwicklung Kanban NestJS DevOps
Miralytik Healthcare Consulting GmbH
remote, Berlin
1 Jahr 6 Monate
2020-01 - 2021-06

Coaching Platform

FULL STACK ENGINEER
FULL STACK ENGINEER

Coaching Platform connecting companies like Amazon with Coaches for one-on-one online training sessions. Coaching for every employee on all career levels.

Role

  • Frontend and Backend development
  • DevOps support
  • Ensuring code quality with code reviews
  • Close cooperation with QA engineers, designers, and product owners for maximizing customer value
  • Remote from Berlin, Germany (since 09/2020) and Osaka, Japan (until 08/2020)

Project Management
Kanban, Lean, Agile


Frontend Technology Stack

  • React
  • Redux
  • Material UI
  • JavaScript


Backend Technology Stack

  • TypeScript
  • Node.js
  • NestJS
  • TypeORM
  • PostgreSQL
  • MongoDB
  • Redis, Socket.io
  • Kafka
  • Docker
  • AWS
  • Heroku


3rd Party Integrations

  • Timekit for Scheduling
  • Vonage for Video Meetings (former OpenTok) and SIP Telephony (former Nexmo)
  • SendGrid, Mailjet as Email Service Provider
CoachHub.io
3 Monate
2020-10 - 2020-12

Fullstack Engineer TypeScript in FINTECH

Fullstack Engineer TypeScript React Nestjs ...
Fullstack Engineer
  • Support of FINTECH startup for rollout to 3 additional clients of the company
  • Design and implementation of requested features by clients 
  • Successful rollout in December
TypeScript React Nestjs Apollo MongoDB
remote
6 Monate
2019-07 - 2019-12

vestr AG

SENIOR BACKEND DEVELOPER & DEVOPS
SENIOR BACKEND DEVELOPER & DEVOPS

FINTECH startup with more than 500 Million US Dollar in assets under management on the platform

Role

  • Design and implementation of Node.js Backend with TypeScript
  • Integration with Bank systems (e.g. for dividends, writing and reading security universe)
  • Maintainance and extension of Kubernetes infrastructure for CI/CD
  • Interviewing prospective developers
  • Implementing Continuous Improvement mentality
  • Remote from Berlin, Germany

Project Management
Agile development following a hybrid of Scrum and Scrumban


Technology Stack

  • Node.js
  • GraphQL
  • MongoDB
  • RabbitMQ
  • ElasticSearch, Kibana, Fluentbit, Fluent
  • Node.js streams
  • Prometheus stack
  • Event Sourcing and CQRS
  • Microservices
  • yarn, lerna, pm2
  • Kubernetes, Helm,
  • Gitlab CI/CD
  • Docker
vestr AG
1 Jahr 1 Monat
2018-07 - 2019-07

vestr AG

BACKEND DEVELOPER
BACKEND DEVELOPER

Role

  • Design and implementation of Node.js backend with TypeScript
  • Shared responsibility for Continuous Integration
  • Remote from Osaka, Japan (until 03/2019) and Berlin, Germany
vestr AG
2 Jahre 6 Monate
2015-04 - 2017-09

Technical University Berlin

WEB DEVELOPER
WEB DEVELOPER
  • Website development (Django Python) and release procedure, discretization.de
  • Web-enabled visualizations (JS, TypeScript) for research paper Confocal Quadrics and Incircular Nets by Akopyan and Bobenko
  • IT technical advisor during conferences and colloquia
Technical University Berlin

Aus- und Weiterbildung

Aus- und Weiterbildung

Kompetenzen

Kompetenzen

Top-Skills

Node.js TypeScript AWS GraphQL JavaScript Nodejs Nestjs MongoDB PostgreSQL Apache Kafka Redis React Frontend-Developer elasticsearch Agile Entwicklung Financial Services BackEnd Svelte Python

Produkte / Standards / Erfahrungen / Methoden

various

Organisational skills

  • Profound and tested knowledge in Agile, Lean, Scrum, Kanban, DevOps culture
    • Engagement to live and spread the values of such for the customers' benefit
    • gained through hands-on experience at vestr AG as DevOps and proactive team member
    • and gained through reading
    • my recommendations: Ries' The Lean Startup, Sutherland's Scrum, Weinberg's Secrets of Consulting
  • Good team-leading skills gained as kendo sports volunteer coach
  • Very good self-management skills gained during self-organized university exchange abroad, e.g.
    • writing research proposal
    • funding
    • formalities related to visa and studying abroad, like insurances, accommodation etc.
    • 6 Daily Engaging Questions - following Marshall Goldsmith - continuous improvement lasting for more than 5
      years

Communication and interpersonal skills

  • Actively speaking and engaged person
  • Asking upper management for "3 things I can do better"
  • Scrutinizing the customer value of stories in Scrum planning
  • Good presentation skills gained through weekly one-hour scientific talk and subsequent Q&A session at Osaka University
  • Very good cross-department communication and business-viability thinking gained in leading and co-leading epics and user stories between Product, Tech, Customer Operations and Legal Departments, e.g.
  • Introduce client-side error monitoring with Sentry while protecting user's privacy at CoachHub
  • Video interview feature at CoachHub with Operations and business-customers creating more than 600 interviews
  • Good communication skills gained during pair programming sessions
  • International competence via first-hand long-year experience in Japan and in international teams
  • Fluent English practiced in daily conversations with Swiss, German, Ukrainian, Polish, Portuguese, Spanish teammates

Job-related skills
JavaScript Libraries

  • React - very good - with Material UI - daily business at CoachHub.io. Also used for website of HTML5 Game Fursorg er and for company website kraenz.eu
  • ElasticSearch, MongoDb, RabbitMQ clients - very good - Technologies used daily in Vestr AG position
  • Nest.js - good - regular use for private backend, e.g. github repo nest-bot (backend calculating moving averages for stock price movements) - professional usage at CoachHub.io
  • Expo stack + React Native - good - you-are-awesome-app sends you daily motivational messages written by grateful people around the world - private project
  • Redux - very good - regular use at CoachHub, see React Native project, long experience with event sourcing and CQRS at Vestr AG
  • RxJS - satisfactory - for nest-bot price calculations
  • Phaser.js - good - Parvenu, a browser-based medieval trading simulation game, 2-person team with me as Lead and Teaching Developer
  • Lodash - very good
  • NextJS - good - kraenz.eu own company website

General programming skills:

  • AWS Certified Solutions Architect Associate
  • Backend Web Development - very good
  • Express Node.js - very good
  • NestJS - very good
  • Django - satisfactory
  • Software Architecture and Design - very good
  • UML - very good
  • Design patterns - very good
  • Project Management - very good
  • git - very good
  • Agile software development - very good
  • Scrum - very good
  • Software Testing - good
  • mocha + chai - very good
  • jest - very good
  • testcafe - satisfactory
  • python frameworks: unittest, mock, coverage - good
  • DevOps - good
  • AWS - multiple services incl. Lambda, RDS, Cognito, EC2, ECS, API Gateway - good
  • Continuous Integration - very good - setup Travis CI and Github Actions in most private projects; improvements to Gitlab CI at vestr

Other IT skills:

  • Office Suite - very good
  • LaTeX- very good

Betriebssysteme

Linux
Ubuntu
16 Bionic Beaver (my personal and work setup)
Ubuntu Server
12 / CentOS 7
Windows

Programmiersprachen

Bash
CSS
HTML
Java
JavaScript
MATLAB
Python
SQL
TypeScript

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

5 Jahre 11 Monate
2020-01 - heute

Kraenz Software Development (self-employed)

FREELANCE WEB DEVELOPER AWS serverless TypeScript ...
FREELANCE WEB DEVELOPER

Zwei veröffentlichte Apps im Google Playstore: https://play.google.com/store/apps/developer?id=Mirco+Kraenz

Coding Streamer on Twitch: https://www.twitch.tv/typescriptteatime

Github: https://github.com/mkraenz

For all my projects, see https://linktr.ee/mkraenz

AWS serverless TypeScript Node.js
Kraenz Software Development (self-employed)
10 Monate
2024-05 - 2025-02

LiveEO GmbH

Full Stack Engineer (Backend-focused) TypeScript NodeJS NestJS ...
Full Stack Engineer (Backend-focused)
Re-contracted to work on previous project "TradeAware" with larger team (~15 people).

Selected responsibilities

- Design and implementation of Questionnaire and File Upload solution with Enterprise-grade security
- Programmatic access to a Public API using OAuth 2.0 & Auth0
- Permissions system for access to Paid Features, including guiding the cross-department design of Enterprise User Onboarding
- Mentoring
TypeScript NodeJS NestJS PostgreSQL React Nx Monorepo Lokalise Mantine UI Mapbox SurveyJS HubSpot AWS S3 AWS Lambda AWS App Runner AWS RDS AWS Eventbridge AWS CloudWatch AWS GuardDuty GitLab CI Netlify Auth0
LiveEO GmbH
1 Jahr 4 Monate
2023-03 - 2024-06

GIFTD GmbH

React Native Developer React Native Redux RevenueCat ...
React Native Developer
Selected Responsibilities:

- Paid Subscriptions Setup with RevenueCat + Apple App Store + Google Play Store
- CI/CD setup
? React Native development for mobile app incl. migration to TypeScript and modernizing tech stack to improve quality and time-to-market of new features
? Continuing consulting from time to time (state Nov 2024).

Special Achievements:
- Time spend on releasing down from 4+ hours to 10 minutes!

 ? Redux ? RevenueCat ? Mixpanel ? TypeScript ? JavaScript ? Serverless Functions ? Firebase ? NoSQL (Firebase Realtime DB) ? GitHub Actions ? Google Play Store ? Apple App Store
React Native Redux RevenueCat Mixpanel TypeScript JavaScript Serverless Functions (GCP) Firebase NoSQL Firebase Realtime DB GitHub Actions Google Play Store Apple App Store
GIFTD GmbH
6 Monate
2023-06 - 2023-11

LiveEO GmbH

Full-Stack Engineer (Backend-focused)
Full-Stack Engineer (Backend-focused)
Full software architecture & design and implementation of MVP for new Supply Chain Compliance solution TradeAware to protect our world's forests and biodiversity in the context of the European Union Deforestation Regulation (EUDR).

LiveEO GmbH
5 Monate
2021-11 - 2022-03

Miralytik Healthcare Consulting GmbH

Software Engineer und Framework-Mentor TypeScript Node.js Svelte ...
Software Engineer und Framework-Mentor

MedTech startup building a web-based Benchmark Tool to compare Hospital performance


Role 

  • Technical expertise and mentoring on NestJS and related technologies 
  • Digitalization of Business Workflow to manage complex Data Access Permissions 
  • Implementation of token-based Authentication and role-based Authorization 
  • Development of Automated Testing Strategy on GraphQL API-level


Tech stack

  • FE: Svelte, Apollo GraphQL, Svelte Material UI, TypeScript, Jest, Cypress
  • BE: TypeScript, Node.js, NestJS, Jest, PostgreSQL, Apollo GraphQL
  • Architecture: Domain-Driven Design (DDD), NestJS-style layered architecture
  • DevOps: Docker, Continuous Deployment on Platform.sh, GitHub Actions


Achievements

  • Guide Product Decisions on the way to MVP release using Golden Path & Value stream mapping
  • High quality code with only a handful of issues identified by QA testers while keeping daily Pull Requests
  • Successfully mentored team to effectively handle NestJS including points to watch out for
TypeScript Node.js Svelte Agile Softwareentwicklung Kanban NestJS DevOps
Miralytik Healthcare Consulting GmbH
remote, Berlin
1 Jahr 6 Monate
2020-01 - 2021-06

Coaching Platform

FULL STACK ENGINEER
FULL STACK ENGINEER

Coaching Platform connecting companies like Amazon with Coaches for one-on-one online training sessions. Coaching for every employee on all career levels.

Role

  • Frontend and Backend development
  • DevOps support
  • Ensuring code quality with code reviews
  • Close cooperation with QA engineers, designers, and product owners for maximizing customer value
  • Remote from Berlin, Germany (since 09/2020) and Osaka, Japan (until 08/2020)

Project Management
Kanban, Lean, Agile


Frontend Technology Stack

  • React
  • Redux
  • Material UI
  • JavaScript


Backend Technology Stack

  • TypeScript
  • Node.js
  • NestJS
  • TypeORM
  • PostgreSQL
  • MongoDB
  • Redis, Socket.io
  • Kafka
  • Docker
  • AWS
  • Heroku


3rd Party Integrations

  • Timekit for Scheduling
  • Vonage for Video Meetings (former OpenTok) and SIP Telephony (former Nexmo)
  • SendGrid, Mailjet as Email Service Provider
CoachHub.io
3 Monate
2020-10 - 2020-12

Fullstack Engineer TypeScript in FINTECH

Fullstack Engineer TypeScript React Nestjs ...
Fullstack Engineer
  • Support of FINTECH startup for rollout to 3 additional clients of the company
  • Design and implementation of requested features by clients 
  • Successful rollout in December
TypeScript React Nestjs Apollo MongoDB
remote
6 Monate
2019-07 - 2019-12

vestr AG

SENIOR BACKEND DEVELOPER & DEVOPS
SENIOR BACKEND DEVELOPER & DEVOPS

FINTECH startup with more than 500 Million US Dollar in assets under management on the platform

Role

  • Design and implementation of Node.js Backend with TypeScript
  • Integration with Bank systems (e.g. for dividends, writing and reading security universe)
  • Maintainance and extension of Kubernetes infrastructure for CI/CD
  • Interviewing prospective developers
  • Implementing Continuous Improvement mentality
  • Remote from Berlin, Germany

Project Management
Agile development following a hybrid of Scrum and Scrumban


Technology Stack

  • Node.js
  • GraphQL
  • MongoDB
  • RabbitMQ
  • ElasticSearch, Kibana, Fluentbit, Fluent
  • Node.js streams
  • Prometheus stack
  • Event Sourcing and CQRS
  • Microservices
  • yarn, lerna, pm2
  • Kubernetes, Helm,
  • Gitlab CI/CD
  • Docker
vestr AG
1 Jahr 1 Monat
2018-07 - 2019-07

vestr AG

BACKEND DEVELOPER
BACKEND DEVELOPER

Role

  • Design and implementation of Node.js backend with TypeScript
  • Shared responsibility for Continuous Integration
  • Remote from Osaka, Japan (until 03/2019) and Berlin, Germany
vestr AG
2 Jahre 6 Monate
2015-04 - 2017-09

Technical University Berlin

WEB DEVELOPER
WEB DEVELOPER
  • Website development (Django Python) and release procedure, discretization.de
  • Web-enabled visualizations (JS, TypeScript) for research paper Confocal Quadrics and Incircular Nets by Akopyan and Bobenko
  • IT technical advisor during conferences and colloquia
Technical University Berlin

Aus- und Weiterbildung

Aus- und Weiterbildung

Kompetenzen

Kompetenzen

Top-Skills

Node.js TypeScript AWS GraphQL JavaScript Nodejs Nestjs MongoDB PostgreSQL Apache Kafka Redis React Frontend-Developer elasticsearch Agile Entwicklung Financial Services BackEnd Svelte Python

Produkte / Standards / Erfahrungen / Methoden

various

Organisational skills

  • Profound and tested knowledge in Agile, Lean, Scrum, Kanban, DevOps culture
    • Engagement to live and spread the values of such for the customers' benefit
    • gained through hands-on experience at vestr AG as DevOps and proactive team member
    • and gained through reading
    • my recommendations: Ries' The Lean Startup, Sutherland's Scrum, Weinberg's Secrets of Consulting
  • Good team-leading skills gained as kendo sports volunteer coach
  • Very good self-management skills gained during self-organized university exchange abroad, e.g.
    • writing research proposal
    • funding
    • formalities related to visa and studying abroad, like insurances, accommodation etc.
    • 6 Daily Engaging Questions - following Marshall Goldsmith - continuous improvement lasting for more than 5
      years

Communication and interpersonal skills

  • Actively speaking and engaged person
  • Asking upper management for "3 things I can do better"
  • Scrutinizing the customer value of stories in Scrum planning
  • Good presentation skills gained through weekly one-hour scientific talk and subsequent Q&A session at Osaka University
  • Very good cross-department communication and business-viability thinking gained in leading and co-leading epics and user stories between Product, Tech, Customer Operations and Legal Departments, e.g.
  • Introduce client-side error monitoring with Sentry while protecting user's privacy at CoachHub
  • Video interview feature at CoachHub with Operations and business-customers creating more than 600 interviews
  • Good communication skills gained during pair programming sessions
  • International competence via first-hand long-year experience in Japan and in international teams
  • Fluent English practiced in daily conversations with Swiss, German, Ukrainian, Polish, Portuguese, Spanish teammates

Job-related skills
JavaScript Libraries

  • React - very good - with Material UI - daily business at CoachHub.io. Also used for website of HTML5 Game Fursorg er and for company website kraenz.eu
  • ElasticSearch, MongoDb, RabbitMQ clients - very good - Technologies used daily in Vestr AG position
  • Nest.js - good - regular use for private backend, e.g. github repo nest-bot (backend calculating moving averages for stock price movements) - professional usage at CoachHub.io
  • Expo stack + React Native - good - you-are-awesome-app sends you daily motivational messages written by grateful people around the world - private project
  • Redux - very good - regular use at CoachHub, see React Native project, long experience with event sourcing and CQRS at Vestr AG
  • RxJS - satisfactory - for nest-bot price calculations
  • Phaser.js - good - Parvenu, a browser-based medieval trading simulation game, 2-person team with me as Lead and Teaching Developer
  • Lodash - very good
  • NextJS - good - kraenz.eu own company website

General programming skills:

  • AWS Certified Solutions Architect Associate
  • Backend Web Development - very good
  • Express Node.js - very good
  • NestJS - very good
  • Django - satisfactory
  • Software Architecture and Design - very good
  • UML - very good
  • Design patterns - very good
  • Project Management - very good
  • git - very good
  • Agile software development - very good
  • Scrum - very good
  • Software Testing - good
  • mocha + chai - very good
  • jest - very good
  • testcafe - satisfactory
  • python frameworks: unittest, mock, coverage - good
  • DevOps - good
  • AWS - multiple services incl. Lambda, RDS, Cognito, EC2, ECS, API Gateway - good
  • Continuous Integration - very good - setup Travis CI and Github Actions in most private projects; improvements to Gitlab CI at vestr

Other IT skills:

  • Office Suite - very good
  • LaTeX- very good

Betriebssysteme

Linux
Ubuntu
16 Bionic Beaver (my personal and work setup)
Ubuntu Server
12 / CentOS 7
Windows

Programmiersprachen

Bash
CSS
HTML
Java
JavaScript
MATLAB
Python
SQL
TypeScript

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

Das Freelancer-Portal

Direktester geht's nicht! Ganz einfach Freelancer finden und direkt Kontakt aufnehmen.