Freelance Senior Software Engineer & Tech Lead · TypeScript · Node · React · AWS/GCP · Berlin I build software and take technical ownership of it.
Aktualisiert am 16.09.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 16.09.2026
Verfügbar zu: 60%
davon vor Ort: 50%
TypeScript
Node
React
JavaScript
Express.js
GraphQL
HTML
CSS
Angular
PostgreSQL
SQL
Prisma
BigQuery
AWS (Lambda)
Google Cloud
Docker
CI/CD
Jest
Cypress
React Testing Library
OpenAI API
Anthropic API
German
native
English
fluent

Einsatzorte

Einsatzorte

Berlin (+10km)
Deutschland
möglich

Projekte

Projekte

2 years 4 months
2023-09 - 2025-12

Introduced AI-assisted tooling into the development process

Engineering Manager TypeScript Node.js React ...
Engineering Manager
  • Led a team of eight engineers, with both technical and line-management responsibility.
  • Cut bug reports in my area of ownership by 60?70 % within six months by reworking testing and review processes.
  • Improved load times by 30?40 % through frontend and database-level performance work.
  • Introduced AI-assisted tooling into the development process.
  • Architecture decisions, roadmap planning and technical alignment with product and leadership.
  • Onboarding and mentoring of new team members.
TypeScript Node.js React PostgreSQL AWS Google Cloud BigQuery Docker GitHub Actions
Handshake (SaaS, recruiting platform) | Berlin
1 year 6 months
2022-04 - 2023-09

Built new product features across the stack

Senior Software Engineer TypeScript Node.js Express ...
Senior Software Engineer
  • Continued development of the platform following the Talentspace acquisition, including integration into the existing system landscape.
  • Built new product features across the stack.
  • Code review, technical design and quality assurance.
TypeScript Node.js Express React GraphQL PostgreSQL Prisma AWS
Handshake | Berlin
6 months
2021-11 - 2022-04

Architecture work and scaling of the existing application

Senior Software Engineer TypeScript Node.js React ...
Senior Software Engineer
  • Technical ownership of core platform components through to the Handshake acquisition.
  • Architecture work and scaling of the existing application.
TypeScript Node.js React GraphQL PostgreSQL
Talentspace | Berlin
2 years
2019-11 - 2021-10

Built an in-house video conferencing solution

Software Engineer TypeScript JavaScript Node.js ...
Software Engineer
  • First full-time engineer building the platform ? from the first version through to production.
  • Built an in-house video conferencing solution for virtual career fairs (2020).
  • Set up deployment pipeline, test infrastructure and monitoring.
TypeScript JavaScript Node.js React GraphQL PostgreSQL Docker Vonage Video / WebRTC
Talentspace | Berlin
3 years 6 months
2016-04 - 2019-09

Supported teaching and research in computer science

Student Assistant
Student Assistant
University of Potsdam

Aus- und Weiterbildung

Aus- und Weiterbildung

2015 ? 2019

B.Sc. IT Systems Engineering

Hasso Plattner Institute, Potsdam

Kompetenzen

Kompetenzen

Top-Skills

TypeScript Node React JavaScript Express.js GraphQL HTML CSS Angular PostgreSQL SQL Prisma BigQuery AWS (Lambda) Google Cloud Docker CI/CD Jest Cypress React Testing Library OpenAI API Anthropic API

Produkte / Standards / Erfahrungen / Methoden

Summary

Full-stack engineer with six years of experience in SaaS product development and additional leadership experience as an Engineering Manager. Focused on TypeScript-based web applications, from architecture through to running them in production. Experienced both in building new products and in scaling and stabilising existing systems. Covers senior developer and tech lead in one person.


Technologies

Backend

  • Node.js
  • Express.js
  • REST APIs
  • GraphQL
  • Ruby on Rails (basic)


Frontend

  • React
  • Angular
  • HTML
  • CSS
  • WebGL/OpenGL


Cloud & infra

  • AWS (Lambda)
  • Google Cloud
  • Docker
  • GitHub Actions
  • CI/CD
  • Terraform (basic)


Testing

  • Jest
  • Cypress
  • React Testing Library
  • Mocha
  • Jasmine
  • Karma


AI

  • OpenAI API
  • Anthropic API
  • LLM integration into products and dev workflows


Practice

  • Software architecture
  • code review
  • technical project leadership
  • agile delivery
  • mentoring


Services

  • End-to-end delivery ? concept, architecture, development, deployment. For new products, MVPs and features.
  • Technical ownership ? tech lead or engineering manager on a fractional basis. Architecture decisions, process, mentoring.
  • Senior capacity for your team ? experienced engineering capacity without a long ramp-up.

Programmiersprachen

TypeScript
JavaScript
Java
Python
PHP
Ruby

Datenbanken

PostgreSQL
SQL
Prisma
BigQuery
MySQL

Einsatzorte

Einsatzorte

Berlin (+10km)
Deutschland
möglich

Projekte

Projekte

2 years 4 months
2023-09 - 2025-12

Introduced AI-assisted tooling into the development process

Engineering Manager TypeScript Node.js React ...
Engineering Manager
  • Led a team of eight engineers, with both technical and line-management responsibility.
  • Cut bug reports in my area of ownership by 60?70 % within six months by reworking testing and review processes.
  • Improved load times by 30?40 % through frontend and database-level performance work.
  • Introduced AI-assisted tooling into the development process.
  • Architecture decisions, roadmap planning and technical alignment with product and leadership.
  • Onboarding and mentoring of new team members.
TypeScript Node.js React PostgreSQL AWS Google Cloud BigQuery Docker GitHub Actions
Handshake (SaaS, recruiting platform) | Berlin
1 year 6 months
2022-04 - 2023-09

Built new product features across the stack

Senior Software Engineer TypeScript Node.js Express ...
Senior Software Engineer
  • Continued development of the platform following the Talentspace acquisition, including integration into the existing system landscape.
  • Built new product features across the stack.
  • Code review, technical design and quality assurance.
TypeScript Node.js Express React GraphQL PostgreSQL Prisma AWS
Handshake | Berlin
6 months
2021-11 - 2022-04

Architecture work and scaling of the existing application

Senior Software Engineer TypeScript Node.js React ...
Senior Software Engineer
  • Technical ownership of core platform components through to the Handshake acquisition.
  • Architecture work and scaling of the existing application.
TypeScript Node.js React GraphQL PostgreSQL
Talentspace | Berlin
2 years
2019-11 - 2021-10

Built an in-house video conferencing solution

Software Engineer TypeScript JavaScript Node.js ...
Software Engineer
  • First full-time engineer building the platform ? from the first version through to production.
  • Built an in-house video conferencing solution for virtual career fairs (2020).
  • Set up deployment pipeline, test infrastructure and monitoring.
TypeScript JavaScript Node.js React GraphQL PostgreSQL Docker Vonage Video / WebRTC
Talentspace | Berlin
3 years 6 months
2016-04 - 2019-09

Supported teaching and research in computer science

Student Assistant
Student Assistant
University of Potsdam

Aus- und Weiterbildung

Aus- und Weiterbildung

2015 ? 2019

B.Sc. IT Systems Engineering

Hasso Plattner Institute, Potsdam

Kompetenzen

Kompetenzen

Top-Skills

TypeScript Node React JavaScript Express.js GraphQL HTML CSS Angular PostgreSQL SQL Prisma BigQuery AWS (Lambda) Google Cloud Docker CI/CD Jest Cypress React Testing Library OpenAI API Anthropic API

Produkte / Standards / Erfahrungen / Methoden

Summary

Full-stack engineer with six years of experience in SaaS product development and additional leadership experience as an Engineering Manager. Focused on TypeScript-based web applications, from architecture through to running them in production. Experienced both in building new products and in scaling and stabilising existing systems. Covers senior developer and tech lead in one person.


Technologies

Backend

  • Node.js
  • Express.js
  • REST APIs
  • GraphQL
  • Ruby on Rails (basic)


Frontend

  • React
  • Angular
  • HTML
  • CSS
  • WebGL/OpenGL


Cloud & infra

  • AWS (Lambda)
  • Google Cloud
  • Docker
  • GitHub Actions
  • CI/CD
  • Terraform (basic)


Testing

  • Jest
  • Cypress
  • React Testing Library
  • Mocha
  • Jasmine
  • Karma


AI

  • OpenAI API
  • Anthropic API
  • LLM integration into products and dev workflows


Practice

  • Software architecture
  • code review
  • technical project leadership
  • agile delivery
  • mentoring


Services

  • End-to-end delivery ? concept, architecture, development, deployment. For new products, MVPs and features.
  • Technical ownership ? tech lead or engineering manager on a fractional basis. Architecture decisions, process, mentoring.
  • Senior capacity for your team ? experienced engineering capacity without a long ramp-up.

Programmiersprachen

TypeScript
JavaScript
Java
Python
PHP
Ruby

Datenbanken

PostgreSQL
SQL
Prisma
BigQuery
MySQL

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

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