"Dr. Lesniak delivered excellent solutions for complex technical and business product requirements — goal-oriented, cost-optimised, performant, professional, and modern. The source code is very well structured and documented. His consulting, ideas, and concepts for architecture and platform development significantly advanced the platform. Communication regarding status, progress, and content was always transparent and professional.

The collaboration was excellent. I would be happy to commission Dr. Lesniak again and recommend him without any reservations."

"Dr. Lesniak consistently delivered high-quality results. His solutions were characterised by technological modernity, excellent performance, and clear, well-structured code. Particularly valuable were his contributions to platform architecture development, integration of new technologies, and process automation.

His ability to quickly grasp complex requirements and translate them into robust solutions significantly advanced our team. We highly valued the collaboration and recommend him unconditionally as an external project partner."

"Michael brought exactly what we needed at the concept stage: sharp technical instincts, an honest outside perspective, and concrete recommendations we could act on immediately. In just a few sessions he helped us avoid costly architectural dead ends and gave our idea a solid technical foundation. A trusted sparring partner for any founder navigating early technical decisions."

"Michael played a pivotal role at Scalable Capital, not only through his technical leadership but also by consistently being hands-on and deeply involved in every aspect of the work. He took full ownership of complex projects, driving them forward with a clear vision while creating an atmosphere where the team felt both challenged and supported.

What set Michael apart was his ability to lead while staying deeply embedded in the technical details. He was never afraid to roll up his sleeves, whether it was troubleshooting a critical issue or diving into the intricacies of system architecture. His hands-on approach meant he wasn't just overseeing the work — he was actively contributing to the most important technical decisions, ensuring everything was built to a high standard.

At the same time, Michael created an environment where people felt empowered to contribute. Whether it was organizing cross-team workshops or mentoring junior engineers, he had a talent for bringing people together and elevating the team's overall performance. His leadership style was collaborative, blending technical precision with a clear understanding of business goals.

Michael's ability to remain calm and focused under pressure was invaluable. Even during tight deadlines, his leadership and attention to detail ensured we consistently delivered. His impact went beyond the technical realm — he left a lasting positive impression on the team and our work culture.

If you're looking for someone who can not only architect and deliver complex technical solutions with precision but also inspire teams to excel, I can't recommend Michael highly enough."

"Working with Michael during his time at Scalable Capital, I was continuously impressed by his exceptional technical acumen and leadership skills. As he moved from senior engineer to staff engineer and finally to principal engineer, Michael demonstrated an outstanding ability to address complex technical challenges in both programming and architectural design with depth and precision.

His structured approach to problem solving, combined with a long-term vision, enabled him to drive key technical initiatives from start to finish. In addition to addressing immediate technical issues, Michael ensured his solutions were future-proof, scalable, and aligned with the company's broader strategic goals.

What really set Michael apart was his ability to motivate and inspire the teams. His leadership fostered collaboration and growth, whether through mentoring young developers or leading the engineering organization in developing innovative solutions. His influence was felt across the board as he created a productive and positive work environment.

In summary, Michael is a highly skilled engineer and a natural leader who seamlessly combines technical excellence with a strategic understanding of business needs. I would highly recommend him to any organization looking for a leader who can balance both technical and business goals."

"During Michael's time as CTO at fino, his ability to bridge the gap between business goals and technical execution was truly exceptional. He had a unique talent for aligning our strategic objectives with a clear technical roadmap, ensuring that every engineering decision delivered real value for the company.

Michael's leadership was defined by a holistic approach to software engineering. He didn't just focus on code or systems; he took into account the entire business context — from product development to customer needs. This broader perspective allowed him to lead the engineering team in delivering scalable, reliable, and high-quality solutions.

In short, Michael excels at uniting business and technology. I highly recommend him to any company looking for a visionary yet practical leader who knows how to turn ideas into impactful, real-world solutions."

"Michael's work at AirMap made a strong impression from the very beginning. His ability to handle constantly changing requirements was bar-raising throughout our time working together. No matter how tight the deadlines or how much the scope shifted, Michael remained focused and consistently delivered high-quality results.

What truly stood out about Michael was how well he worked within our international team. With colleagues spread across Europe, Argentina, and the U.S., clear communication and teamwork were essential. Michael excelled at both. He always fostered a positive atmosphere, making sure everyone was on the same page despite the distance and time zone differences.

In addition to his technical depth, Michael had a structured and thoughtful approach to tackling challenges. He was great at breaking down complex problems into manageable tasks, keeping the bigger picture in mind while ensuring we hit our deadlines. His level of ownership combined with his ability to stay organized and level-headed, even in high-pressure situations, was a huge asset to the team.

All in all, Michael was a key player in our team. His technical skills, adaptability, and collaborative nature made him an invaluable part of the group, and I wouldn't hesitate to recommend him!"

"Working with Michael at Scalable Capital was a great experience. He always took a holistic approach to problem-solving, thinking through the entire process from design to deployment, making sure everything lined up with the bigger product vision. Michael had a real knack for asking smart questions that helped shape the product and spot potential issues before we even started implementing.

On top of his technical skills, Michael was incredibly reliable. He always delivered high-quality work on time and brought a lot of positive energy to the team. His upbeat attitude and sense of humor made even the toughest projects more enjoyable. Whether we were dealing with tricky technical challenges or tight deadlines, I always knew I could count on Michael to deliver and keep the team's spirits up.

In short, Michael combines great technical expertise with a fun and collaborative work style. I highly recommend him to any team looking for a talented, dependable, and enjoyable engineer to work with."

"I've worked with Michael on a few projects. He's the kind of engineer who combines high-quality coding skills with a solid understanding of business goals. His knowledge of Java, Spring Boot, and AWS was super helpful, and thanks to his proactive attitude, we always hit our deadlines. He didn't need much direction; he just took charge and got things done.

If you're looking for someone who can bridge the gap between tech and business and actually deliver, I highly recommend Michael. He's great to work with and brings real value to the table."

"I had the pleasure of working with Michael for many years across a variety of projects and domains, and he consistently proved to be one of the most reliable engineers I've ever worked with. No matter the complexity or deadline pressure, Michael's dedication and work ethic were unwavering.

Over the years, I saw firsthand how his architectural skills helped shape scalable, robust solutions that were always built with future growth in mind. His strategic mindset ensured we were never just solving immediate problems but also preparing for what was ahead.

What truly sets Michael apart is his steady, proactive approach. He tackles challenges head-on, keeps everything on track, and always delivers on his commitments. For any team in need of a dependable engineer with deep architectural expertise, Michael is a top-notch choice."