Product Leader · CS Background · Builder
Tudor
Stadiu
Head of Product at Voxa
I build products that stick — and businesses that grow around them. CS-trained, startup-obsessed, with a track record across Series A and B of turning early traction into durable, measurable growth.
- Subscription growth
- Gamification
- Engagement & retention loops
- Paywall design
- Go-to-market
- User research & A/B testing
- Monetisation strategy
- Product strategy & roadmapping
- Mobile & Web
- 0 → 1 & scaling (Series A–C)
- B2B & B2C
Selected work
My work
Audiobooks & E-books · Mobile & Web Platform
Owned the full product org — strategy, roadmap, prioritisation, and delivery end-to-end through and past Series A
+220%
Annual sub conversion
+65%
Engagement lift
+35%
Weekly actives
2M+
Downloads
4.8★
Both stores
- As Head of Product, owned the full product org across a multi-tenant audiobook and ebook platform — setting strategy, owning the roadmap, and driving delivery through and past Series A
- Designed a gamification system from scratch driving a 65% sustained lift in engagement — built on behavioural loops, streaks, and reward mechanics that actually stuck
- Architected paywall and subscription billing logic achieving a 220% increase in annual plan conversion, optimising pricing tiers, trial flows, and upgrade prompts
- Drove 35% WAU growth through feature development, search improvements, personalised recommendations, and platform-level retention work
- Operated across iOS, Android, and web — navigating complex billing lifecycles on both App Store and Google Play
- Defined and tracked core KPIs across the product — activation, retention, LTV, and churn — using data to prioritise high-impact initiatives
- Led cross-functional collaboration with engineering, design, QA, and marketing to ship features on cadence and maintain product quality
#1 Christian Devotional & Daily Worship App
Led the engagement initiative squad — owning the engagement & retention feature area as PM reporting to CPO
2×
WAUs in 12 months
600K→1.2M
Weekly actives
2.5×
North Star cohort
4.9★
Both stores
- Improved engagement and retention as the PM reporting to the CPO, helping drive Glorify to Series B and 50M downloads
- Launched and iterated on a gamification system resulting in a 30% increase in user engagement — 2× WAU in one year
- Grew the North Star cohort 2.5× through a user collaboration feature, leveraging analytics, A/B testing, and user clustering to personalise experiments
- Utilized Mixpanel for analytics, Taplytics for A/B tests and feature flags, and Figma prototypes to drive continuous product improvements
- Led the engagement initiative squad — owning engagement and retention features end-to-end, from discovery through delivery
- Collaborated with marketing teams to create effective go-to-market strategies across multiple countries
Sports Intelligence Platform · B2B SaaS
Owned the new B2C vertical from zero — strategy, product development, and signing the first major enterprise client
B2C
New vertical launched
1st
Major enterprise client signed
↑ Eff.
Dev team efficiency
- Led the product team, driving strategic vision and execution to align with company goals — including spearheading the new B2C vertical and signing the first major client
- Acted as the bridge between key stakeholders, collaborating with Sales, Customer Support, Engineering, CEO, and CTO to ensure product success
- Facilitated all Scrum ceremonies — sprint planning, stand-ups, retrospectives, and backlog grooming — to maintain team efficiency and alignment
- Conducted customer research and interviews to gather insights, identify pain points, and shape product priorities
- Defined and prioritized the product roadmap, ensuring alignment with business objectives and market demands
- Developed and optimized processes to improve cross-functional communication and workflow efficiency
- Monitored industry trends and competitor movements, ensuring the product remains competitive and innovative
Women's Fitness & Wellness · 40+ · 1.1M+ users
Full ownership from zero — launch strategy, onboarding, activation, and international scaling across 10+ markets
0→30K
MAU from zero
−35%
Churn post-launch
+260%
D0 & D1 engagement
10+
Countries scaled
- Coordinated a multifunctional team to create a new mobile app from scratch — reaching 30K MAU with a 260% jump in Day 0 and Day 1 engagement at launch
- Cut churn by over 35% post-launch through relentless onboarding, activation, and early lifecycle improvements
- Managed product backlog and prioritization using agile methodologies, ensuring alignment with business objectives and timely delivery of key milestones
- Leveraged Mixpanel for analysis and Segment for scalability, integrating customer insights from the CX squad and Figma mockups to iteratively refine product performance
- Scaled across 10+ countries, adapting for local market fit without fragmenting product coherence
- Cultivated strong relationships with key stakeholders — customers, partners, and internal teams — to gather insights and drive consensus on product direction
Retrics
Candidate Assessment Platform · B2B SaaS
Seed round @ Uneti Ventures · First enterprise client: studentflex.nl
1M€
Seed valuation
5
First enterprise clients
Top 10
Finalist at Start Summit
- Co-founded Retrics — a B2B SaaS platform for candidate assessment through gamified psychometric tests, built from zero to a 1M€ seed valuation
- Led all product decisions end-to-end: strategy, roadmap, specs, and iterating with customers — while keeping the team moving fast without breaking things
- Drove business development and closed the first 5 enterprise clients, including studentflex.nl, validating product–market fit in the HR tech space
- Managed investor relations and fundraising process, securing a Seed round from Uneti Ventures at a 1M€ valuation
- Designed the full product in Figma — UX, UI flows, and component library — from a blank canvas to a production-ready interface
- Ran sprint planning and managed the development backlog in Jira, bridging the gap between product requirements and engineering delivery
- Contributed directly to the ReactJS frontend codebase, enabling tighter product–engineering feedback loops and faster iteration cycles
Background
About me
Systems first
Products are systems. I design the loops, incentives, and feedback mechanisms — not just the features.
Data, then intuition
I start with the numbers, then bring in the taste. Decisions are only as good as the signals behind them.
Ship and sharpen
Good enough and live beats perfect and stuck. I ship fast, measure honestly, and iterate relentlessly.
I'm a product leader with a computer science background — equally at home in a strategy session, a sprint review, and a data deep-dive. I don't hand off specs and disappear; I stay close until it ships right.
My edge is at the intersection of growth, monetisation, and engagement. I've built subscription businesses, designed gamification loops that actually retain users, and crafted paywall strategies that convert — across mobile, web, and multi-platform environments.
I've been part of teams that went from zero to Series A, and zero to Series B. I know what early looks like, and I know what it takes to stop looking early.
Outside the product, genuinely curious — about startups, emerging tech, and how people build things that last.
Product & strategy
Product strategyRoadmappingOKRsGo-to-marketPaywall designSubscription billingGamificationRetention loopsUser researchA/B testingPRDsSprint planning
Analytics & data
MixpanelTaplyticsPostHogSegmentJitsuTableauAmplitudeFirebaseGoogle AnalyticsHotjar
Mobile & technical
iOS / App StoreAndroid / PlayXcodeAndroid StudioElasticsearchStripeREST APIsSQLGit
Let's build something.
Open to the right conversations and the right opportunities.
Bucharest-based. Remote-friendly.
Bucharest-based. Remote-friendly.