Senior Full Stack Software Engineer – React, Node.js

Bertelsmann SE & Co. KGaA

Senior Full Stack Software Engineer at smartclip developing React frontends and Node.js APIs for adtech. Engaging in collaboration and architectural decisions while ensuring code quality and efficient APIs.

Posted 7/14/2026full-time🇩🇪 GermanySeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack JavaScript development, with a focus on building modern React frontends and Node.js APIs using TypeScript. Strong emphasis on code quality, testing practices, and collaboration with cross-functional teams to deliver scalable solutions.

Highest-signal resume keywords

Full-Stack JavaScript DevelopmentNode.js (Koa, Express, Fastify)ReactTypeScriptREST/GraphQL API Development

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Hard Skills

Full-Stack JavaScript DevelopmentNode.jsTypeScriptReactSQL QueryingDatabase DesignREST API DevelopmentGraphQLTesting Frameworks (Jest, Vitest)Clean Code Practices

Soft Skills

CollaborationProblem-SolvingCommunication

Tools & Technologies

AWSJenkinsGrafanaGraylogConfluenceJira

Industry Keywords

AdtechModern Web ArchitecturesAutomated Testing

Tech Stack

Tools & technologies

AWSGrafanaGraphQLJavaScriptJenkinsJestMariaDBMySQLNode.jsPostgresReactShell ScriptingSQLTypeScript

About the role

Key responsibilities & impact

Join our UI Engineering team and take ownership of full-stack projects that power our adtech ecosystem
Build and maintain modern React frontends and Node.js APIs with TypeScript
Design and implement REST or GraphQL APIs that scale efficiently
Collaborate closely with backend engineers, designers, and product owners to translate requirements into elegant solutions
Write clean, maintainable, and well-tested code – with automated tests as a natural part of your workflow
Contribute to architecture decisions and best practices

Requirements

What you’ll need

5+ years of hands-on experience in full-stack JavaScript development
Deep knowledge of Node.js (framework e.g. Koa, Express or Fastify), TypeScript, React and modern web architectures
Solid understanding of relational databases (e.g. MySQL, MariaDB, PostgreSQL or SQL Server), including database design, SQL querying, and REST API development (GraphQL is a plus)
A strong sense of code quality with mandatory hands-on experience in testing, including frameworks such as e. g. Jest, Vitest, or Node’s built-in testing framework – Clean design and automated tests are not optional
Bonus points for experience with: AWS, Jenkins, Grafana, Graylog, Confluence, Jira, Shell scripting

Benefits

Comp & perks

30 days of vacation + Dec 24 & 31 off
Smart Fridays (4 days week possible)
mobility (Germany ticket & JobRad)
sports & health offerings
mental health support
corporate benefits
RTL+ access