The team that stays until it works
We've spent 20+ projects learning what makes AI products hold up beyond the demo: build for businesses with real customers waiting and own everything from design through deployment. Every build includes four weeks of bug fixing after development.
About Adamant Code
Projects Completed
Reviews on Clutch
Why Clients Choose Us
We're a team of six based in Rijeka, Croatia, building for clients across the US, UK, and EU.
Our clients are business owners: coaches, agencies, contractors, founders. They come to us with an idea or a manual process that's eating their team, and we build the whole product: strategy, design, engineering, AI. Think of a renovation where one crew does the plumbing, the electricity, and the finish work.
The proof is in the products. TCE's source-cited document system is still in production and reduced estimated search time from about 60 to 10 minutes per engineer per working day, based on engineer interviews and client estimates. For TNM Coaching, we spent 18 months and two major versions turning TNM's 25 years of coaching expertise into a multilingual text-and-voice coaching product.
AI moves fast and demos are easy. Products that survive real customers are not. That's the part we're for.
Credentials you can verify
Expert-Vetted on Upwork (top 1%), Top Rated Plus, and verified reviews on Clutch. Verified by clients, not by us.
Upwork Expert-Vetted
Top 1% of talent in their field on Upwork
Upwork Top Rated Plus
Proven success on large and long-term Upwork contracts
Verified Clutch Reviews
Feedback published and verified on Clutch
Why ‘Adamant’
Our name isn't accidental. Adamant comes from an ancient word for a stone of impenetrable hardness, a symbol of strength and durability. That's how we build: reliable systems, clean code, and long-lasting results.
If you're looking for a partner who moves fast, collaborates deeply, and builds solutions that stand the test of time, you're in the right place.
We don't disappear at handoff. Every project includes four weeks of bug fixing after development, with ongoing optimization and maintenance available separately. That's what we mean when we say we stay until it works.
Hear From Our Clients
We're proud of the relationships we build. Here's what our clients have to say about their experience working with us.
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
"The work on the app has been transformative for my business, creating a product that elevates my workflow, enhances my professionalism, and makes managing client interactions far more efficient."
"Adamant Code's determination to deliver exactly what I asked for and on time was most impressive. Their technical expertise and commitment to quality exceeded my expectations."
"The tools have now started to improve the speed and quality of our work. Complex tasks can now be achieved much easier and faster on a regular basis."
"It was great working with Luka and Adamant Code! There was very clear communication back and forth, and very prompt response times."
"You didn’t just build features. You listened. The challenge was not only developing technology, but translating the human complexity of coaching into something usable."
"You worked faster than I could have expected. We had timelines, and you guys blew past them—but it wasn’t sloppy. We didn’t rush through and then have to go back and fix a ton of things."
"You guys were ready right on time, the day you promised. That stood out to me because I worked with other freelancers, and timely delivery was a struggle. I had to jump in and do the final pieces to deliver on time."
"It felt like we were working with a true partner and not just a development agency. Adamant Code was very loyal from the beginning."
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