Shaping innovation –
career at GRINTECH

Internship semester/ bachelor’s thesis: Controlling & Controlling & Finance – Focus: Production Costing & Process Optimisation (m/f/d)

About us: We are GRINTECH

We are a world-leading supplier of gradient-index micro-optics (GRIN lenses) based in Jena, the ‘City of Light’. As an owner-managed medium-sized company (approx. 50 employees), we combine international high-tech expertise with short decision-making processes. Join our interdisciplinary team of physicists, engineers and business graduates! Want to find out more about us? Find out everything about our company here.

Your projects at GRINTECH:

You will support our commercial management team with two key strategic tasks:

Costing upgrade: Developing a robust system for calculating machine hourly rates to determine our production costs (using cost allocation sheets) and, subsequently, to calculate full costs
Financial processes: Familiarisation with financial accounting, with a focus on optimising the recording of research and funding projects

Your profile:

Studies/ Degree: Industrial Engineering, Business Administration or equivalent (minimum undergraduate studies/ first cycle)
Experience: Initial experience in a manufacturing company is an advantage
Skills: Strong analytical and conceptual thinking skills
Personality: reliable, creative, solution-oriented, communicative and a team player

What we offer:

Compensation: Attractive monthly internship salary
Mobility & Health: Public transportation allowance & health benefits
Workplace: State-of-the-art IT equipment in a central location in Jena
Culture: International team, flat hierarchies, and real responsibility

Key Facts & Start Date:

Duration: Internship semester or bachelor’s thesis (approx. 6 months)
Start: Immediately, no later than October 1st 2026
If German is not your first language, we kindly ask your language proficiency level to be C1 or higher