Work Experience

Building AI-native products end to end, solo.

• Built and run gotcosy.com, a live multilingual AI hotel-discovery product (Next.js, React, TypeScript, Supabase, Vercel) that scores hotels for cosiness on a calibrated 0 to 10 scale
• Engineered a two-stage scoring pipeline: a vision model reads the photo, then a stronger model weighs image, text and 100+ human taste examples into a deterministic score, with strict grounding rules so it scores only from real evidence
• Cut running cost sharply by moving high-volume image analysis from a paid cloud API to a free open-weight model (Qwen) on local hardware, reserving the paid model for final judgement only
• Built Subfeel (subfeel.com), an instrument that reads nine specific feelings in reviews: nine detectors judged blind against human verdicts, a locally fine-tuned 14B model, and an MCP endpoint for AI clients
• Launched Got Hush (gothush.com), 813 hotels with evidence-gated quiet scores deduced from guest reviews
• Built DIE-OS, a domain-agnostic operating system for running AI agents on real work: 14 constrained roles, 14 gates, append-only conduct laws and a mechanical law checker. Public at github.com/perwinroth/die-os
• Applied answer-engine optimization so AI assistants cite the products directly.
• Built and published Marco, a friend check-in iOS app, on the App Store

Advised Parasition, whose AI Hugo is a marketing co-working space for the music industry, on product and go-to-market.

Led development of WMG's D2C FanApp platform with focus on privacy compliance and user experience.

• Spearheaded the development and launch of WMG's new D2C FanApp platform, ensuring privacy compliance, seamless user login flows, and efficient internal data management
• Designed and executed product strategies and roadmaps, driving user adoption, business growth, and streamlined cross-functional execution
• Deployed predictive algorithms within Warner Connect to refine audience segmentation, leveraging user research and data-driven targeting to boost email marketing conversion rates from 12.5% to over 35%
• Guided the integration of the FanApp platform with WMG's technology stack and marketing capabilities, leveraging Salesforce, Tableau, and Jira to enhance scalability and operational efficiency
• Provided strategic guidance to Development teams and managed stakeholders across WMG's global organization, ensuring alignment and seamless collaboration between internal teams and external VIPs

Created and expanded Warner Connect, generating SEK 250+ million in revenue and engaging 100+ million users.

• Instigated the creation and directed the rapid expansion of Warner Connect, a platform that became WMG's most-used marketing tool, generating SEK 250+ million in revenue and engaging 100+ million users
• Developed Warner Connect into a custom user research platform for the music industry, enabling real-time analysis of Spotify streaming data and marketing consents to optimize audience targeting and fan engagement
• Led cross-functional teams across Technical, Creative, and Marketing departments through the entire product lifecycle, integrating product development with marketing strategies to drive business growth
• Built and executed data-driven strategic roadmaps to accelerate product adoption, enabling targeted audience deployment across social networks and email systems, resulting in 15+ million fan registrations
• Partnered with local Marketing and Data Science teams to create bespoke campaigns by analyzing data, refining predictive algorithms, and optimizing targeting strategies to drive engagement and performance
• Supported the successful execution of all major artist releases from 2019 to 2024 by aligning product development, marketing efforts, artist management, and artists
• Collaborated directly with renowned artists and their management, including Coldplay, David Guetta, and Ed Sheeran, to deliver impactful marketing campaigns and innovative fan engagement strategies

Led the acquisition and operational build-out of Topsify, Warner Music's playlist marketing platform, taking it live across about 60 territories, coordinating local digital marketing teams and establishing the MarTech infrastructure to run playlist marketing at scale. Coordinated global efforts with Spotify, Apple and Deezer, with budget responsibility for playlist-acquisition marketing spend.

Managed CRM activities and data for the Nordic Innovation Team, and led rebranding and data migration during EMI's acquisition.

• Managed CRM activities and data for the Innovation Team in the Nordic region, using Salesforce, Tableau, and Google Analytics to optimize customer relationship processes and enhance data-driven decision-making
• Delivered impactful product initiatives, aligning product strategies with organizational goals and market demands
• Led rebranding and data migration efforts during EMI's acquisition by PLG, ensuring a seamless transition and compliance with new legal guidelines across all Nordic territories

Led marketing across web, print, and social media, and managed Debaser's web platform for artists.

• Led marketing initiatives across web, print, and social media using Notified, Google Analytics, and Meta to enhance brand visibility, audience engagement, and community interactions
• Served as Product Manager for Debaser's web platform for artists, aligning its functionality with business goals and optimizing fan participation through targeted marketing strategies