I had a pleasure to with Jarek for a couple of good years on a novel, high scale, performance-oriented computing engine. He was one of the best, having deep and broad software engineering knowledge, creative approach and algorithmic mindset. He was very reliable but also very communicative and fun to work with. Definitely a great asset for every team working as a leader and team mate, with the biggest potential unlocking towards complex systems and problems. Good luck Jarek on your endeavours!

I thoroughly recommend Jarek Rosiek as an employee, professional/expert and a human. I had a privilege to work with him at Sabre between 2006 and 2013, and I must say I own him a lot for his tremendous support and contribution during that time. We worked together on building Shopping and Pricing technology platform for airlines, travel agencies and travel management companies. It was a critical, 24/7, real-time system processing over 5000 shopping and pricing transactions per second on over a thousand servers. Jarek started as an intern and quickly became a valuable team member supporting our team with his in-depth academic knowledge of algorithms, data structures and technologies such as SQL, C++ and Java. I was amazed by how quickly he grasped a very complicated travel business domain. That made him one of the critical team players driving more and more complicated efforts and finally becoming one of the key architects in our area. He started his Lead/Architect role working on the Shopping Orchestration layer (Intellisell). He drove efforts to design and build a better version of a rule engine and a distributed Intellisell Cache system. He was also one of the two designers and creators of the innovative Intellisell IO/multithreading framework. With time he increased his influence and expertise by core Shopping and Pricing areas. He drove critical initiatives like performance optimization, improved memory management, parallel builds, Bulk Charger, Cache Controller, and redesign of core Shopping Engine. He contributed to building and optimizing sophisticated algorithms that had to start from 1.9 trillion options and return good trips in 3 seconds for customers worldwide, taking into account numerous business rules, currencies, national tax systems and other country-specific regulations. One of Jarek's greatest strengths is his intellectual horsepower and innovativeness – he cooperated with the Research department on proactive Low Fare Cache charging for Intellisell Cache and design for new Low-Cost Carriers shopping prototype. I valued Jarek for his attitude to work, easiness of moving from planning to action and willingness to step up and own a problem. At the end of his job at Sabre Jarek was a very known and admired go-to expert for key technology people at Sabre offices in Dallas, Kraków and Bangalore.

I had a pleasure to with Jarek for a couple of good years on a novel, high scale, performance-oriented computing engine. He was one of the best, having deep and broad software engineering knowledge, creative approach and algorithmic mindset. He was very reliable but also very communicative and fun to work with. Definitely a great asset for every team working as a leader and team mate, with the biggest potential unlocking towards complex systems and problems. Good luck Jarek on your endeavours!

I thoroughly recommend Jarek Rosiek as an employee, professional/expert and a human. I had a privilege to work with him at Sabre between 2006 and 2013, and I must say I own him a lot for his tremendous support and contribution during that time. We worked together on building Shopping and Pricing technology platform for airlines, travel agencies and travel management companies. It was a critical, 24/7, real-time system processing over 5000 shopping and pricing transactions per second on over a thousand servers. Jarek started as an intern and quickly became a valuable team member supporting our team with his in-depth academic knowledge of algorithms, data structures and technologies such as SQL, C++ and Java. I was amazed by how quickly he grasped a very complicated travel business domain. That made him one of the critical team players driving more and more complicated efforts and finally becoming one of the key architects in our area. He started his Lead/Architect role working on the Shopping Orchestration layer (Intellisell). He drove efforts to design and build a better version of a rule engine and a distributed Intellisell Cache system. He was also one of the two designers and creators of the innovative Intellisell IO/multithreading framework. With time he increased his influence and expertise by core Shopping and Pricing areas. He drove critical initiatives like performance optimization, improved memory management, parallel builds, Bulk Charger, Cache Controller, and redesign of core Shopping Engine. He contributed to building and optimizing sophisticated algorithms that had to start from 1.9 trillion options and return good trips in 3 seconds for customers worldwide, taking into account numerous business rules, currencies, national tax systems and other country-specific regulations. One of Jarek's greatest strengths is his intellectual horsepower and innovativeness – he cooperated with the Research department on proactive Low Fare Cache charging for Intellisell Cache and design for new Low-Cost Carriers shopping prototype. I valued Jarek for his attitude to work, easiness of moving from planning to action and willingness to step up and own a problem. At the end of his job at Sabre Jarek was a very known and admired go-to expert for key technology people at Sabre offices in Dallas, Kraków and Bangalore.

I had a pleasure to with Jarek for a couple of good years on a novel, high scale, performance-oriented computing engine. He was one of the best, having deep and broad software engineering knowledge, creative approach and algorithmic mindset. He was very reliable but also very communicative and fun to work with. Definitely a great asset for every team working as a leader and team mate, with the biggest potential unlocking towards complex systems and problems. Good luck Jarek on your endeavours!

I thoroughly recommend Jarek Rosiek as an employee, professional/expert and a human. I had a privilege to work with him at Sabre between 2006 and 2013, and I must say I own him a lot for his tremendous support and contribution during that time. We worked together on building Shopping and Pricing technology platform for airlines, travel agencies and travel management companies. It was a critical, 24/7, real-time system processing over 5000 shopping and pricing transactions per second on over a thousand servers. Jarek started as an intern and quickly became a valuable team member supporting our team with his in-depth academic knowledge of algorithms, data structures and technologies such as SQL, C++ and Java. I was amazed by how quickly he grasped a very complicated travel business domain. That made him one of the critical team players driving more and more complicated efforts and finally becoming one of the key architects in our area. He started his Lead/Architect role working on the Shopping Orchestration layer (Intellisell). He drove efforts to design and build a better version of a rule engine and a distributed Intellisell Cache system. He was also one of the two designers and creators of the innovative Intellisell IO/multithreading framework. With time he increased his influence and expertise by core Shopping and Pricing areas. He drove critical initiatives like performance optimization, improved memory management, parallel builds, Bulk Charger, Cache Controller, and redesign of core Shopping Engine. He contributed to building and optimizing sophisticated algorithms that had to start from 1.9 trillion options and return good trips in 3 seconds for customers worldwide, taking into account numerous business rules, currencies, national tax systems and other country-specific regulations. One of Jarek's greatest strengths is his intellectual horsepower and innovativeness – he cooperated with the Research department on proactive Low Fare Cache charging for Intellisell Cache and design for new Low-Cost Carriers shopping prototype. I valued Jarek for his attitude to work, easiness of moving from planning to action and willingness to step up and own a problem. At the end of his job at Sabre Jarek was a very known and admired go-to expert for key technology people at Sabre offices in Dallas, Kraków and Bangalore.