We know threshold technology like no one else.

we help create reliable joinery and modern spaces.

We deliver threshold systems, hardware and accessories for manufacturers, architects and developers – solutions that eliminate complaints, speed up production and enhance the quality of the finished product.

We don’t just sell – we advise, educate and support our clients in their growth. Because with Alumaster, our partners gain not only technology, but also peace of mind.

Why do we do it?

Because we believe in partnership that delivers real value – not just a product. We believe that good solutions begin with understanding the customer’s needs.

That’s why we don’t just supply products – we listen, advise, support and help our clients grow. For us, the relationship with the customer is more than a transaction. It’s a shared journey in which we are engaged from the first contact through implementation to the final result.

Our mission

To support window and door manufacturers in creating products that combine quality, innovation and user comfort.

To deliver certified threshold sealing systems and proven, reliable components. To help our clients grow, build a competitive advantage and earn market trust. To base business relationships on partnership rooted in honesty, respect and shared values.

Meet the people behind Alumaster

We help, advise and support. Technology is one thing, but without the people who understand it and know how to choose the right solutions, there is no final result.

We are not a corporation with a complex structure. We are a close-knit, dedicated team that combines technical expertise with a human approach. We have our own warehouse and office – and in each of these areas work real people who truly know what they’re doing.

Konrad Duszyński

Authorized signatory, Development coordinator

He looks for solutions before a problem appears. He likes clean details, functional design and conversations with partners that lead to concrete improvements.

Krzysztof Duszyński

CEO Alumaster

A founder and leader who knows what reliability means – not only in thresholds, but also in relationships. He co-creates the company’s direction with full commitment, integrity and solid business principles.

 
 

Office, sales and marketing team

They are the ones who answer the phones, go out into the field, reply to emails, explain the details and handle every order. They double-check, ask the right questions and advise – precisely and with a smile.

Warehouse and logistics team

Thanks to them, products arrive on time. They don’t like chaos — they prefer efficient organization. They know every model, every package and every route.

Work where technology meets people

Join the Alumaster team

At Alumaster, we believe that good things are created with good people. We focus on trust, development and shared responsibility – each of us works in the area where we perform best.

We value commitment and competence, and we want everyone to have a real influence on the company, regardless of their position.

We are not currently recruiting, but if you feel you would be a good fit for our team — feel free to send us your CV or a message. We’ll be happy to learn about your experience and get back to you when the right opportunity arises.

Applications can be sent to

Thank you for your trust – We dedicate these awards to our clients and our team

We don’t operate to collect titles – but when they are awarded for customer trust, stable growth and reliability, we see them as a shared success.

In recent years, we have been recognised several times in the Business Gazelles and Forbes Diamonds rankings.

Forbes Diamonds

2024

2023

2020

Gazele

2024

2023

2021

2020

2019

For us, it’s confirmation that acting in line with our values truly pays off – not only in business.