Senior Frontend Engineer | React, TypeScript, Playwright | Test Automation & Quality | Banking & Fintech | Available immediately
Aktualisiert am 06.05.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 18.05.2026
Verfügbar zu: 100%
davon vor Ort: 100%
React
TypeScript
Playwright
Jest
Node.js
Vue.js
End-To-End-Test
Testautomatisierung
JavaScript
Testautomatisierungstools
HTML5
CSS3
REST
Git
Figma
Agile Softwareentwicklung
Scrum
Accessibility
Front-End
UI-Tests
Test
Test Case Design
English
Muttersprache
French
C1
Spanish
B1
German
B1

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

2 years
2024-06 - 2026-05

Algorithmic Trading System

Software Developer Pine Script TradingView LLMs ...
Software Developer
  • Built a live algorithmic trading system handling real capital, where every unhandled edge case had direct financial consequences.
  • Designed risk management logic covering dozens of edge cases across volatile market conditions, with structured logging and real-time monitoring for post-incident analysis.
  • Used AI-assisted development tooling (Claude Code, LLMs) for architecture validation, complex debugging, and documentation.
Pine Script TradingView LLMs Front-End JavaScript Git Code Review Node.js
Independent
2 years 2 months
2022-11 - 2024-12

CI/CD pipeline

EM
EM
  • Increased release cadence from monthly to weekly by restructuring CI/CD pipelines and establishing automated quality gates.
  • Developed a green/amber/red risk framework for release decisions that became the team standard for go/no-go calls.
  • Mentored 15 engineers on writing testable code, running effective code reviews, and thinking about failure modes before shipping.
3 years 3 months
2021-10 - 2024-12

Banking Platform Modernization

Senior Frontend Engineer / Engineering Manager React TypeScript Playwright ...
Senior Frontend Engineer / Engineering Manager
  • Introduced Playwright and Jest to the organization, building the first end-to-end test suite for a banking platformserving millions of users.
  • Discovered a security vulnerability in the feature flag system during routine investigation that could have exposed unreleased features to production users. Flagged it, built the fix, and established a review process that prevented recurrence.
  • Caught a critical edge case in a card management feature where specific user flows bypassed validation. Identified it through systematic scenario testing before the feature reached production.
  • Rebuilt key UI components for the banking platform rewrite, focusing on accessibility and cross-browser reliability.
React TypeScript Playwright QA Testautomatisierung End-To-End-Test Test Case Design
DKB
5 months
2021-06 - 2021-10

Fintech Platform Rebuild

Software Frontend Engineer Vue.js TypeScript Front-End ...
Software Frontend Engineer
  • Led the frontend rebuild of a fintech platform used by 10,000+ financial advisors, replacing a legacy application with a Vue/TypeScript architecture.
  • Owned the migration strategy, ensuring feature parity and minimal disruption during the transition.
Vue.js TypeScript Front-End QA End-To-End-Test Testautomatisierung
CAPinside
1 year 9 months
2019-10 - 2021-06

Product Comparison Platform

Senior Frontend Engineer Vue.js JavaScript SEO ...
Senior Frontend Engineer
  • Built product comparison tools in Vue (chatbots, dynamic loading, infinite scroll) directly tied to conversion and acquisition metrics.
  • Improved page load performance through lazy loading and SEO optimizations, measurably growing organic traffic. Promoted to Senior Engineer.
Vue.js JavaScript SEO Performanceoptimierung
Compado
Berlin
1 year 2 months
2018-09 - 2019-10

Medical Education Platform

Frontend Engineer React JavaScript A/B Testing ...
Frontend Engineer
  • Shipped features on a React-based medical education platform used by 500K+ students. Ran A/B tests that improved engagement metrics and contributed to the product exiting beta.
  • Collaborated with Product on user research, translating qualitative findings into frontend implementation decisions.
React JavaScript A/B Testing User Research
AMBOSS
Berlin
2 years 10 months
2015-09 - 2018-06

various Projects

Critical Care Registered Nurse
Critical Care Registered Nurse

  • Managed 3?4 ICU patients per shift, making rapid clinical decisions under pressure with zero margin for error. CCRN certified.
  • The diagnostic instinct and systematic triage thinking from this work directly shaped how I approach software quality and incident response.

NYU Langone Health
New York

Aus- und Weiterbildung

Aus- und Weiterbildung

4 months
2018-06 - 2018-09

Full Stack Web Development

Ironhack, Berlin
Ironhack, Berlin
Intensive full stack web development bootcamp. JavaScript, React, Node.js, HTML, CSS, Git.

Position

Position

Senior Frontend Engineer ? Test Automation & Quality

Kompetenzen

Kompetenzen

Top-Skills

React TypeScript Playwright Jest Node.js Vue.js End-To-End-Test Testautomatisierung JavaScript Testautomatisierungstools HTML5 CSS3 REST Git Figma Agile Softwareentwicklung Scrum Accessibility Front-End UI-Tests Test Test Case Design

Schwerpunkte

React
Experte
TypeScript
Experte
Git
Experte
Node
Experte
REST API
Experte
HTML5
Experte
Code Review
Experte
Testing
Experte
Test Case Design
Experte
QA
Experte

Produkte / Standards / Erfahrungen / Methoden

Profile

Senior engineer with 8 years of experience shipping web products and a deep focus on software quality, automated testing, and system reliability. Built and maintained Playwright and Jest test ecosystems across enterprise platforms. Background in critical care nursing sharpened a pattern for catching problems before they manifest. Recently built a production trading system solo, where code reliability was directly tied to financial outcomes. Looking for an IC role where quality, reliability, and strong execution matter.


Skills

Testing & Quality

  • Playwright
  • Jest
  • E2E automation
  • test architecture
  • CI/CD quality gates
  • risk assessment
  • edge-case analysis


AI-Assisted Development

Production use of LLMs and agentic coding tools (Claude Code) for architecture, implementation, and debugging


Cross-functional

Technical writing, stakeholder communication, user research translation, roadmap contribution

Programmiersprachen

TypeScript
JavaScript
Node.js
React
Vue.js
Next.js
REST APIs
Git

Branchen

Branchen

  • Banking
  • Fintech
  • Financial Services
  • Healthcare
  • E-Commerce
  • EdTech

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

2 years
2024-06 - 2026-05

Algorithmic Trading System

Software Developer Pine Script TradingView LLMs ...
Software Developer
  • Built a live algorithmic trading system handling real capital, where every unhandled edge case had direct financial consequences.
  • Designed risk management logic covering dozens of edge cases across volatile market conditions, with structured logging and real-time monitoring for post-incident analysis.
  • Used AI-assisted development tooling (Claude Code, LLMs) for architecture validation, complex debugging, and documentation.
Pine Script TradingView LLMs Front-End JavaScript Git Code Review Node.js
Independent
2 years 2 months
2022-11 - 2024-12

CI/CD pipeline

EM
EM
  • Increased release cadence from monthly to weekly by restructuring CI/CD pipelines and establishing automated quality gates.
  • Developed a green/amber/red risk framework for release decisions that became the team standard for go/no-go calls.
  • Mentored 15 engineers on writing testable code, running effective code reviews, and thinking about failure modes before shipping.
3 years 3 months
2021-10 - 2024-12

Banking Platform Modernization

Senior Frontend Engineer / Engineering Manager React TypeScript Playwright ...
Senior Frontend Engineer / Engineering Manager
  • Introduced Playwright and Jest to the organization, building the first end-to-end test suite for a banking platformserving millions of users.
  • Discovered a security vulnerability in the feature flag system during routine investigation that could have exposed unreleased features to production users. Flagged it, built the fix, and established a review process that prevented recurrence.
  • Caught a critical edge case in a card management feature where specific user flows bypassed validation. Identified it through systematic scenario testing before the feature reached production.
  • Rebuilt key UI components for the banking platform rewrite, focusing on accessibility and cross-browser reliability.
React TypeScript Playwright QA Testautomatisierung End-To-End-Test Test Case Design
DKB
5 months
2021-06 - 2021-10

Fintech Platform Rebuild

Software Frontend Engineer Vue.js TypeScript Front-End ...
Software Frontend Engineer
  • Led the frontend rebuild of a fintech platform used by 10,000+ financial advisors, replacing a legacy application with a Vue/TypeScript architecture.
  • Owned the migration strategy, ensuring feature parity and minimal disruption during the transition.
Vue.js TypeScript Front-End QA End-To-End-Test Testautomatisierung
CAPinside
1 year 9 months
2019-10 - 2021-06

Product Comparison Platform

Senior Frontend Engineer Vue.js JavaScript SEO ...
Senior Frontend Engineer
  • Built product comparison tools in Vue (chatbots, dynamic loading, infinite scroll) directly tied to conversion and acquisition metrics.
  • Improved page load performance through lazy loading and SEO optimizations, measurably growing organic traffic. Promoted to Senior Engineer.
Vue.js JavaScript SEO Performanceoptimierung
Compado
Berlin
1 year 2 months
2018-09 - 2019-10

Medical Education Platform

Frontend Engineer React JavaScript A/B Testing ...
Frontend Engineer
  • Shipped features on a React-based medical education platform used by 500K+ students. Ran A/B tests that improved engagement metrics and contributed to the product exiting beta.
  • Collaborated with Product on user research, translating qualitative findings into frontend implementation decisions.
React JavaScript A/B Testing User Research
AMBOSS
Berlin
2 years 10 months
2015-09 - 2018-06

various Projects

Critical Care Registered Nurse
Critical Care Registered Nurse

  • Managed 3?4 ICU patients per shift, making rapid clinical decisions under pressure with zero margin for error. CCRN certified.
  • The diagnostic instinct and systematic triage thinking from this work directly shaped how I approach software quality and incident response.

NYU Langone Health
New York

Aus- und Weiterbildung

Aus- und Weiterbildung

4 months
2018-06 - 2018-09

Full Stack Web Development

Ironhack, Berlin
Ironhack, Berlin
Intensive full stack web development bootcamp. JavaScript, React, Node.js, HTML, CSS, Git.

Position

Position

Senior Frontend Engineer ? Test Automation & Quality

Kompetenzen

Kompetenzen

Top-Skills

React TypeScript Playwright Jest Node.js Vue.js End-To-End-Test Testautomatisierung JavaScript Testautomatisierungstools HTML5 CSS3 REST Git Figma Agile Softwareentwicklung Scrum Accessibility Front-End UI-Tests Test Test Case Design

Schwerpunkte

React
Experte
TypeScript
Experte
Git
Experte
Node
Experte
REST API
Experte
HTML5
Experte
Code Review
Experte
Testing
Experte
Test Case Design
Experte
QA
Experte

Produkte / Standards / Erfahrungen / Methoden

Profile

Senior engineer with 8 years of experience shipping web products and a deep focus on software quality, automated testing, and system reliability. Built and maintained Playwright and Jest test ecosystems across enterprise platforms. Background in critical care nursing sharpened a pattern for catching problems before they manifest. Recently built a production trading system solo, where code reliability was directly tied to financial outcomes. Looking for an IC role where quality, reliability, and strong execution matter.


Skills

Testing & Quality

  • Playwright
  • Jest
  • E2E automation
  • test architecture
  • CI/CD quality gates
  • risk assessment
  • edge-case analysis


AI-Assisted Development

Production use of LLMs and agentic coding tools (Claude Code) for architecture, implementation, and debugging


Cross-functional

Technical writing, stakeholder communication, user research translation, roadmap contribution

Programmiersprachen

TypeScript
JavaScript
Node.js
React
Vue.js
Next.js
REST APIs
Git

Branchen

Branchen

  • Banking
  • Fintech
  • Financial Services
  • Healthcare
  • E-Commerce
  • EdTech

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

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

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