Merantix

Fullstack Engineer

Merantix

full-time

Posted on:

Location Type: Hybrid

Location: Berlin • 🇩🇪 Germany

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Job Level

JuniorMid-Level

Tech Stack

JavaScriptNext.jsNode.jsPostgresReactTypeScript

About the role

  • Build our MVP and shape core technology for an AI-native energy supplier
  • Build features end-to-end across frontend (React/Next.js), backend (Node.js/TypeScript), and database (PostgreSQL)
  • Design scalable architecture in a modern monorepo setup
  • Collaborate directly with founders, product, and early customers
  • Debug, refactor, and iterate quickly to keep the platform robust and fast
  • Take responsibility for technical decisions that set the foundation for scale

Requirements

  • 2+ years of experience building production-grade fullstack applications
  • Strong skills in Node.js and TypeScript
  • Proficient with modern frontend frameworks (React, Next.js)
  • Solid database knowledge (PostgreSQL or similar)
  • Comfortable working across the full stack and eager to take ownership
  • Pragmatic, solution-driven, and motivated by solving real-world problems in energy and climate
  • Fluent in English (our team language); German a plus
  • Expertise in workflow automation and agent frameworks (e.g., n8n, LangGraph) is a strong asset
Benefits
  • Impact: Build the foundation of an AI-native energy supplier at a decisive stage
  • Stability: Backed by Merantix’s venture studio and AI ecosystem
  • Growth: Direct exposure to startup building, AI adoption, and energy markets
  • Culture: Small, ambitious team with ownership, speed, and collaboration
  • Tech: Greenfield setup with modern stack—minimal tech debt
  • Compensation: Competitive salary + ESOP participation
  • Work model: Based at the AI Campus Berlin; hybrid flexibility possible

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
Node.jsTypeScriptReactNext.jsPostgreSQLfullstack developmentworkflow automationagent frameworksscalable architecturedebugging
Soft skills
ownershipsolution-drivenmotivationcollaborationpragmatic