Open to new opportunities

Juliana
Tatagiba

AI Product Manager · Growth · Mobile

Senior PM with 10+ years building products that grow. She doesn't just talk about AI — she ships with it. Currently building Digital Nest using Next.js, Claude Code and Vercel.

Juliana Tatagiba
About Juliana

Building the future
of AI product

📈
+30%
Recurring subscription — Japan market
🧪
50+
A/B experiments designed & analyzed
👥
1M+
MAU across products she owned
🤖
+20%
Revenue scaling a product from scratch
Skills & Expertise
AI Product Management Product Strategy Growth & Experimentation A/B Testing Mobile Apps Claude & Claude Code Next.js Roadmapping User Research Conversion Optimization App Store Connect Amplitude · Firebase Cursor · Vercel Multi-agent Systems
Featured work

What she builds &
what she measures

What she built
Digital Nest
AI-powered family digital safety platform for parents and children aged 7–16. Full-stack implementation — designed and built solo, currently in active development.
Stack: Next.js · Claude Code · Vercel
Architecture: multi-agent conversational system
Status: currently in active development — launching soon
What she measured
Growth Experimentation at Scale
Designed and ran 50+ A/B experiments across acquisition, activation, monetization and retention for consumer mobile apps with 1M+ MAU in the US, UK, Japan and Europe.
+30% recurring subscription — Japan market localisation
+20% revenue scaling a product with no PM or handover
+12% acquisition improvement — AI-powered chatbot feature
What she automated
Job Search AI System
Built a personal AI-powered job search system with specialized agents: achievement extractor, adaptive CV builder, offer scorer and interview simulator — all in Cursor + Claude Code. This portfolio is also part of that journey — conceived, designed and shipped by Juliana using Claude Code, Cursor, Next.js and Vercel.
Modules: 5 specialized skills/agents
Stack: Claude Code · Cursor · Markdown
Output: CV adapted per offer in minutes
Case Studies

How she thinks &
how she works

A selection of product initiatives across two mobile apps — each with different constraints, the same approach: research, experiment, measure, iterate.

01
Growth Localisation Experimentation

Growing a Strategic Market Through Product Localisation

Challenge

Japan was one of the strongest markets globally for the product category, yet activation, conversion and recurring subscriptions were consistently underperforming. QA and localisation audits found no technical issues — the problem had to be elsewhere.

Approach

Partnered with SEM and requested a market audit from Google to understand Japanese consumer psychology and purchasing behaviour. Combined those insights with behavioural analytics to identify hypotheses around pricing presentation, onboarding emotional connection and visual identity.

A roadmap of experiments was designed to validate each hypothesis: localised onboarding, redesigned pricing page, different price points, weekly/monthly/yearly plans, free trials and multiple visual identities. One experiment stood out: when shortlisting onboarding images, a Japanese colleague confirmed that three of the proposed models were actually Korean. Her recommended image — truly representative of Japanese users — became the winning variant, and the fully localised paywall outperformed all others.

The findings extended beyond this app. Japan was subsequently treated as a standalone market across the majority of the portfolio, with personalised approaches delivering results across multiple products.

Results
+20%Install-to-Sale conversion
+30%Recurring subscription
+25%Revenue in Japan
−10%Churn
💡

The biggest optimisation opportunity wasn't technical — it came from understanding users in their local context.

02
Product Ownership Analytics Delivery

Scaling a Product With No Handover and a Team Still Learning the Codebase

Challenge

Took ownership of a mobile scanning app that had spent over a year without a dedicated PM — almost no handover, limited documentation, a confusing backlog and significant functional gaps vs competitors.

Approach

Before proposing anything new, created visibility: built a realistic roadmap, benchmarked competitors, identified critical gaps and reconstructed the analytics layer from scratch — auditing events, removing duplicates, creating a consistent taxonomy and documenting the full measurement framework.

When a major OCR-powered search feature required a larger architectural refactor than expected — and an engineer went on long-term sick leave — reorganised releases so the OCR project continued in parallel while A/B tests and quick wins kept shipping continuously.

Results
+18%Conversion
+20%Revenue
−15%Churn
+11%Revenue from OCR feature
💡

Experimentation velocity doesn't require perfect conditions — it requires good prioritisation and the discipline to keep shipping while solving harder problems in parallel.

03
UX Redesign Retention Core Experience

Modernising a Core Product Experience

Challenge

Camera Translation — one of the app's most used features — had evolved through years of rapid experimentation into a fragmented experience. Two critical pain points emerged from research: users had to manually select the source language before scanning, and the translation frame required constant manual adjustment.

Approach

Combined behavioural analytics, user reviews, UX research and customer feedback to define the redesign scope. Migrated to a more capable OCR provider with automatic language detection, expanded language support and a cleaner translation overlay directly on top of the original text — removing friction from the core user journey without disrupting the experimentation cadence.

Results
+18%Average app rating
−35%Churn among Camera Translation users
💡

As products mature, sustainable growth increasingly comes from improving the quality of core experiences rather than continuously adding new functionality.

04
Market Expansion Hypothesis Testing Asia

Validating Market Assumptions Across Asian Markets

Challenge

Following the Japanese market research, South Korea had been treated as a generic Asian market. Deeper analysis suggested user behaviour was actually closer to Western markets — a hypothesis worth testing rather than assuming.

Approach

Adapted acquisition and monetisation experiments to reflect Western market dynamics rather than Asian generalisations. Tested pricing, onboarding and messaging strategies aligned with the hypothesis that Korean users behaved differently from the Japanese market.

Results
~15%Growth in Korean market

Those gains were later reduced following a marketing budget reallocation towards higher-performing regions — a business decision outside product scope. The experiments, however, successfully validated that market assumptions should always be tested, not inherited.

💡

Generalising user behaviour across countries is a product risk. The value of this initiative wasn't only the revenue growth — it was proving that assumptions need data to survive.

Career

Professional Experience

AI Product Management — Independent
Apr 2026 – Present
Founder & Builder
📍 Barcelona, Spain
Designing and building Digital Nest, an AI-powered family digital safety platform — full-stack with Next.js, Vercel and Claude Code, currently in active development. Completing AI Product Manager PRO at The Hero Camp, covering AI product strategy, discovery frameworks and AI-assisted development workflows. Built a personal AI job search system with specialized agents for achievement extraction, adaptive CV generation, offer scoring and interview simulation. Designed and shipped this portfolio — including an AI assistant trained on her professional profile — using Next.js, Claude Code, Cursor and Vercel.
AI Product Claude Code Next.js Multi-agent Systems Prompt Engineering
Leadtech
Jun 2021 – Mar 2026
Senior Product Manager
📍 Barcelona, Spain
Led product discovery, experimentation and growth for consumer mobile apps serving 1M+ MAU across North America, Europe and Asia. Spearheaded AI-powered initiatives delivering +12% acquisition improvement. Designed 50+ A/B experiments driving +45% trial-to-subscription, +10% install-to-sale and −5% same-day cancellations. Aligned Engineering, Design, Data, ASO and Marketing stakeholders.
Growth A/B Testing Mobile Apps ASO Amplitude Firebase
Leadtech
Oct 2015 – Jun 2021
Customer Service · QA Lead · Product Ops
📍 Barcelona, Spain
Progressively promoted from Customer Service Agent to Quality Assurance Lead and Releases Product Specialist. Built deep foundations in user experience, operational excellence and cross-functional collaboration that directly informed later product work.
Operations Quality Assurance Release Management User Experience
Background

Education &
Languages

AI Product Manager PRO
The Hero Camp
2026
Digital Marketing
Fundación UNED
2020 – 2021
Software Project Management with Scrum
Dicampus
2020
Bachelor's Degree in Journalism
FACHA (currently UNIFACHA)
1999 – 2005
PortugueseNative
SpanishFull professional
EnglishFull professional
Contact

Let's talk

Open to Senior PM and AI PM roles across Europe and remote-global markets.

✉️
Email
juliana.tatagiba@gmail.com
in
LinkedIn
juliana-tatagiba
JT

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