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Diotech's primary focus areas are on lighting, energy and resource saving solutions. We provide low maintenance cost solutions based on customers' individual preferences.



Co-founder & Chief Executive Officer

Tel: +372 53 738 619
Email: siim.soplepmann@.ee

Siim has spent more than eight years working on various technology projects. Before joining Diotech, he was a business development manager for an ultra capacitator development company.

Siim earned his Bachelor’s degree from Macalaster College in the US, and from the University of Barcelona. In addition, Siim is currently finalizing his MBA at the Tallinn University of Technology.


Co-founder & Chief Development Officer

Tel: +372 51 499 62
Email: mart.moora@.ee

Prior to joining Diotech, Mart worked as an R&D consultant. His biggest projects have been related to energy and industrial lighting.

Mart earned his Bachelor’s from Towson University in the US, and from Cambridge University in the UK. Mart also has a Master’s degree in Economics from the University of Tartu.


Supply chain manager, Diotech OÜ

Tel: +372 520 6210
E-mail: siim.meho@.ee

Siim is Diotech’s sales and customer support. Siim’s main tasks are related to budgeting, lighting engineering and warehouse management.

Siim is currently attaining a higher education in business management and his ambition is to contribute to systematic development of fast growing company.


Project Manager, Diotech Electric OÜ

Tel: +372 5550 5583
E-mail: taras.josiptsuk@.ee

Taras has a experience in electrical work since 2011. He has studied power equipment in Tallinn University of Technology’s Estonian Maritime Academy. His area of expertise involves electrical engineering, electronics, automation, electrical equipment, thermodynamics and refrigeration equipment.

His work experiences is primarily related to electrical installation and construction. In Diotech Electric, Taras is responsible for budgeting projects, leading electrical works and consulting customers. He is also experienced in KNX and DALI control systems, multimedia, communication and automations solutions.



Sales Manager, Diotech OÜ

Tel: +372 5270 606
E-mail: siim.kuunal@.ee

Siim main responsibilities include sustainable lighting solutions along with solar power systems. Main objective is to promote energy savings and innovative ideas to improve our everyday lives.

Siim is also simultaneously an university lector at Tallinn University of Technology and doctoral student in the field of nanotechnology. Diotech OÜ is ideal place for fulfilling his life mission, which is to introduce innovation to the larger masses.


Project Manager, Diotech Electric OÜ

Tel: +372 5698 6047
E-mail: janek.kirss@.ee

Janek has more than 10 years of experience in constructing and maintaining electrical systems.

Most of Janek's prior work has been related to managing electrical construction works.

Janek holds a B1 competence level certificate. Also, Janek is certified to implement solar plant installation projects.


Sales Manager, Diotech OÜ

Phone: +372 56 158 785

E-mail: mikk.helleste@.ee

Prior to joining Diotech, Mikk worked as a product manager in one of the Estonia’s largest energy companies.. His largest projects have been related to lightning. For many years, Mikk has also worked in the manufacturing industry, for example while managing large steel construction projects for Scandinavian customers.

Mikk acquired  his Master’s degree in the field of product development and manufacturing from Tallinn University of Technology.

His main tasks in Diotech are related to Sales and Customer Management in Northern Estonia.


Project Manager, Diotech OÜ

Tel: +372 5330 3683

E-mail: tonu.biedermann@.ee

Tõnu has more than 17 years of experience in both managing and implementing electrical construction and maintenance projects. Prior to joining Diotech, Tõnu was working as a dispatcher for a large Distribution System Operator. Tõnu holds an A-grade competence certificate. He has graduated from the Estonian University of Life Sciences with a degree in Energy Utilization. Tõnu's key roles in Diotech are related to budgetting and managing electrical construction projects as well as implementing running inspections for electrical installations.


Senior Project Manager, Diotech Electric OÜ

Tel: +372 5380 0300
E-mail: tonu.tiirmaa@.ee

Tõnu has over 10 years of experience in electricity construction and maintenance of indoor as well as outdoor electrical installations. Majority of his past work has been related to managing electrical engineering projects.

As the CEO of Diotech Electric, Tõnu is responsible for implementing top quality electrical engineering projects.