Principal Software Engineer

leonardo. impact

Lead Software Engineer overseeing development team and software for measuring sustainability impact. Hybrid role in Frankfurt requiring extensive software development and leadership experience.

Posted 5/7/2026full-timeFrankfurt am Main • 🇩🇪 GermanyLead💰 €70,000 - €80,000 per yearWebsite

Tech Stack

Tools & technologies

AWSJavaScriptMicroservicesNext.jsNode.jsReactTypeScript

About the role

Key responsibilities & impact

Lead a growing development team, incl. coaching other developers to upgrade the overall skill level of the team
Make key technical & architectural decisions to ensure a high standard of security, efficiency and scalability
Hands-on development of the leonardo web application
Perform FE and BE code reviews and ensure best practices and high code quality is maintained
Research & recommend new technologies that will meet business requirements
Optimise code and algorithms to boost performance
Setup and optimise DevOps processes
Attend meetings with stakeholders and clients to provide technical feedback
Deployment of ML models
Collaborate with the Product, Design and ML teams to provide estimates and inputs on the difficulty & limitations of features

Requirements

What you’ll need

Minimum 9 years of experience in software development
Experience in leading, hiring, and mentoring a development team
Advanced knowledge in: Next.js, React.js, Node.js, TypeScript, Test Driven Development, DevOps, MLOps, AWS Services
Familiarity with MLOps, particularly experience with pipelines that require large language models or computer vision
Fluent in spoken and written English
Experience with both monolith and microservices architectures
Comfortable communicating ideas or deliverables to the team and clients

Benefits

Comp & perks

Flexible working hours and a hybrid working model
30 days paid leave per year
Personal and professional development opportunities
Opportunity to build and influence the product and dev team
An international team
Company laptop
Bike leasing
Gym pass

ATS Keywords

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Hard Skills & Tools

Next.jsReact.jsNode.jsTypeScriptTest Driven DevelopmentDevOpsMLOpsAWS Servicescode optimizationarchitectural decision making

Soft Skills

leadershipmentoringcommunicationcollaborationcoachingstakeholder engagementtechnical feedbackproblem-solvingteam managementadaptability