1191 English-speaking jobs in Berlin

Senior Full Stack Engineer to build the Campaign Engine, shipping end-to-end features using PHP/Laravel APIs and React UI. Requires 5+ years experience, deep expertise in PHP 8, Laravel, TypeScript, and contract-first API design.

Lead Frontend Engineer builds high-traffic UIs using JavaScript and Vue.js. This role involves implementing features to optimize UX, collaborating with cross-functional teams, and driving architectural decisions. Requires 8+ years of front-end experience with TypeScript.

Lead Backend Engineer for Personalization, owning complex systems in Search, Recommendations, or Sorting. Shape architecture for high-throughput services, combining ML and business logic. Requires 7+ years building scalable backend systems.

Senior Backend Engineer develops the search engine for ABOUT YOU using Node.js/TypeScript. Responsibilities include query understanding, entity resolution, and integrating LLMs and embedding models. Requires 5+ years building scalable, low-latency backend APIs.

Develop the recommendation engine using Node.js/TypeScript, serving offline ML models at scale. Design personalization logic, build GenAI features, and own reverse-ETL pipelines. Requires 3+ years building high-throughput backend services.

Lead Fullstack Engineer owning end-to-end architecture for modular add-ons. Responsibilities include backend logic (Laravel), frontend integration (Vue.js 3), CI/CD, and driving AI coding workflows. Requires 8+ years in complex fullstack applications.

Senior Backend Engineer to build and own a high-throughput ranking engine. Responsibilities include developing low-latency APIs with Node.js/TypeScript and designing batch write pipelines. Requires 5+ years of backend experience and strong SQL knowledge.

Develop a cutting-edge Search Engine using Node.js and TypeScript. Manage large data volumes with Google BigQuery and build high-traffic APIs. Requires 3+ years in Backend and 2+ years building scalable APIs.

Mechanical Engineering & Simulation Expert role requires 5+ years of experience in product design or analysis. Responsibilities include building and debugging FEA/CFD models and validating AI-generated artifacts using tools like SolidWorks, ANSYS, or Python.

STEM Data Specialist evaluates AI-generated content in STEM fields for accuracy and rigor. Responsibilities include reviewing scientific data, providing structured feedback to research teams, and developing evaluation rubrics. Graduate-level training in Engineering, Physics, Math, Chemistry, or Software Engineering is required.

Product Design/UX Expert role involving evaluating design decisions and developing product mockups using Figma, Sketch, or Adobe. Requires 3+ years at a prestigious tech firm and experience providing UX/User Journey feedback.

Open Source Maintainer role guiding AI/ML research and engineering. Responsibilities include code review, designing engineering tasks, and evaluating AI-written code against repository standards. Requires proven open-source contribution history.

Analytics Leader role constructing enterprise data science scenarios for large-scale predictive modeling and analytics governance at Fortune 500 accounts. Requires 5+ years as a data scientist or ML engineer with F500 data product ownership.

Core Contributor/Open Source Maintainer role guiding AI model performance via code review and open-source maintenance. Requires senior judgment, hands-on project building (including Docker), and a verified history as a core contributor to a widely used open-source project.

Data Science Expert role requires 5+ years of industry experience, ideally in business operations or product data science. Responsibilities include designing grading criteria and scoring AI/human work samples with detailed justifications. Fluency in A/B testing, SQL/Python, and strong written communication is essential.

Data Engineering Specialist role using frontier AI coding agents to complete and evaluate complex data engineering tasks. Requires 2+ years of experience with ETL pipelines, data warehouses, or distributed data systems.

Astrophysics and Cosmology Expert needed to design computational problems for AI evaluation. Requires graduate STEM training, strong Python skills, and proficiency with scientific software in a Linux environment.

Chess Expert needed for game reconstruction and transcript correction. Requires 1800+ ELO, fluency in algebraic notation, and attention to detail to ensure accuracy in chess commentary transcripts.

Computational Mathematician role requires a PhD in a related field and depth in two subdomains like numerical linear algebra. Responsibilities include writing scientific prompts and calibrating tasks to improve AI model performance using Python or R.

This contract role requires hands-on experience running creator or influencer programs. Responsibilities include designing task briefs, reviewing AI agent attempts, and evaluating AI-generated marketing content to improve model performance.