Im Sergej Žižek, a Senior Product Strategist dedicated to building products that solve real user needs through thoughtful strategy and data-driven insights. I specialize in leading cross-functional teams to create clear roadmaps, refine user experiences, and scale products from initial concepts to successful solutions. My approach combines analytical rigor with a focus on user impact, delivering measurable business outcomes while fostering collaboration and growth. 
Im Sergej Žižek, a Senior Product Strategist dedicated to building products that solve real user needs through thoughtful strategy and data-driven insights. I specialize in leading cross-functional teams to create clear roadmaps, refine user experiences, and scale products from initial concepts to successful solutions. My approach combines analytical rigor with a focus on user impact, delivering measurable business outcomes while fostering collaboration and growth. 

Work Experience

2025 -

Founder and Product Specialist

Orris Studio

I run a boutique product strategy studio for early-stage SaaS teams and EU SMEs. I help founders validate faster, raise activation, and ship with confidence by combining product management, UX, and lightweight AI prototyping.

2025 -

Founder and Product Specialist

Orris Studio

I run a boutique product strategy studio for early-stage SaaS teams and EU SMEs. I help founders validate faster, raise activation, and ship with confidence by combining product management, UX, and lightweight AI prototyping.

2025 -

Founder and Product Specialist

Orris Studio

I run a boutique product strategy studio for early-stage SaaS teams and EU SMEs. I help founders validate faster, raise activation, and ship with confidence by combining product management, UX, and lightweight AI prototyping.

2022– 2024

Senior Product Manager

Refurbed GmbH

I owned the acquisition and mobile growth roadmap, combining UX research, analytics, and rapid experimentation to deliver +€1M incremental revenue and a +15% retention lift. I launched the Buyback (trade-in) vertical, reaching a 6% gross capture rate in the first six months and supporting the company’s sustainability goals. I built and led the app product vertical to profitability while maintaining a 4.0+ store rating, and improved delivery speed by 15% by introducing Scrum@Scale. I also deployed an internal CMS that cut campaign time-to-launch by 20%, enabling faster, safer releases.

2022– 2024

Senior Product Manager

Refurbed GmbH

I owned the acquisition and mobile growth roadmap, combining UX research, analytics, and rapid experimentation to deliver +€1M incremental revenue and a +15% retention lift. I launched the Buyback (trade-in) vertical, reaching a 6% gross capture rate in the first six months and supporting the company’s sustainability goals. I built and led the app product vertical to profitability while maintaining a 4.0+ store rating, and improved delivery speed by 15% by introducing Scrum@Scale. I also deployed an internal CMS that cut campaign time-to-launch by 20%, enabling faster, safer releases.

2022– 2024

Senior Product Manager

Refurbed GmbH

I owned the acquisition and mobile growth roadmap, combining UX research, analytics, and rapid experimentation to deliver +€1M incremental revenue and a +15% retention lift. I launched the Buyback (trade-in) vertical, reaching a 6% gross capture rate in the first six months and supporting the company’s sustainability goals. I built and led the app product vertical to profitability while maintaining a 4.0+ store rating, and improved delivery speed by 15% by introducing Scrum@Scale. I also deployed an internal CMS that cut campaign time-to-launch by 20%, enabling faster, safer releases.

2023 – 2024

Product Manager

Aaqua Tech BV

Managed three agile teams, introducing Scrum at Scale and improving delivery timelines by 20%. Led international workshops to define UX standards for global markets (EU, US, Asia). Directed content management system enabling creator monetization and community growth. Delivered MVP aligned with strategic product vision.

2023 – 2024

Product Manager

Aaqua Tech BV

Managed three agile teams, introducing Scrum at Scale and improving delivery timelines by 20%. Led international workshops to define UX standards for global markets (EU, US, Asia). Directed content management system enabling creator monetization and community growth. Delivered MVP aligned with strategic product vision.

2023 – 2024

Product Manager

Aaqua Tech BV

Managed three agile teams, introducing Scrum at Scale and improving delivery timelines by 20%. Led international workshops to define UX standards for global markets (EU, US, Asia). Directed content management system enabling creator monetization and community growth. Delivered MVP aligned with strategic product vision.

2019 – 2021

Product Owner

Oryx Gaming/Bragg

Built and led a 7-member team for a B2B online casino management backoffice system. Implemented Behavior-Driven Development (BDD) for efficient automation testing. Designed the Oryx atomic design system and interactive prototypes, accelerating feedback cycles and product iterations.

2019 – 2021

Product Owner

Oryx Gaming/Bragg

Built and led a 7-member team for a B2B online casino management backoffice system. Implemented Behavior-Driven Development (BDD) for efficient automation testing. Designed the Oryx atomic design system and interactive prototypes, accelerating feedback cycles and product iterations.

2019 – 2021

Product Owner

Oryx Gaming/Bragg

Built and led a 7-member team for a B2B online casino management backoffice system. Implemented Behavior-Driven Development (BDD) for efficient automation testing. Designed the Oryx atomic design system and interactive prototypes, accelerating feedback cycles and product iterations.

2018 – 2021

Directof of UX and Product Strategy

Independent Consultant

Designed and optimized the core product experience for a mental health startup, contributing to a 40% increase in user retention. Conducted user research and usability testing to inform product decisions, translating insights into thoughtful interfaces. Collaborated closely with the founding team to define the brand’s visual and interaction language.

2018 – 2021

Directof of UX and Product Strategy

Independent Consultant

Designed and optimized the core product experience for a mental health startup, contributing to a 40% increase in user retention. Conducted user research and usability testing to inform product decisions, translating insights into thoughtful interfaces. Collaborated closely with the founding team to define the brand’s visual and interaction language.

2018 – 2021

Directof of UX and Product Strategy

Independent Consultant

Designed and optimized the core product experience for a mental health startup, contributing to a 40% increase in user retention. Conducted user research and usability testing to inform product decisions, translating insights into thoughtful interfaces. Collaborated closely with the founding team to define the brand’s visual and interaction language.