Hanif Carroll
Senior Frontend Engineer
I build React and TypeScript products, from data-heavy dashboards to web and mobile applications. I also build AI features and integrations. Open to remote employment and contract work.
Projects
Palabruno
Built and launched a React web workspace and React Native apps for Spanish learners and teachers, including an interactive reader, student and group management, sharing, and subscriptions.
Genrupt
Built a Next.js AI image editor and seller workflows for generating, reviewing, and editing creative content. Helped Genrupt support its first 200 paying customers.
Mucho Hangouts
Stabilized messaging, notifications, app state, and authentication in a live React product, while supporting a five-person team through code review, pairing, and clearer engineering patterns.
Casamo
Designed, built, and operate a live stay-research product, with Airbnb and Booking.com evidence, comparison views, durable searches, credit recovery, and authenticated AI client access.
BA Eventos
Built a live AI event-discovery product that turns fragmented Buenos Aires listings into grounded search across 1,250+ upcoming events, backed by 9,200+ event records and 1,500+ venues.
Feedback
Experience
- Mar 2024 — Present
Founder & AI Product Engineer · HC Studio
Build web and mobile products for founders and product teams, owning interfaces, AI features, integrations, and launch.
Genrupt
Product engineering
- Built a Next.js AI image editor that turns detected text into editable layers, connecting OCR and inpainting to an interactive editing workflow.
- Shipped seller interfaces for creative variations, batch editing, and A+ content, with generation status, retry, and recovery paths.
- Prevented concurrent AI generation from overdrawing account balances through atomic PostgreSQL credit reservations, row locking, and failure cleanup.
- Moved image generation to pg-boss jobs; made video retries reuse provider jobs and settle costs idempotently.
- Exposed market-analysis and Amazon listing workflows through MCP, with OAuth, organization-aware access, and asynchronous results.
Palabruno
Full-stack engineering
- Shipped a React web workspace and React Native / Expo apps across web, iOS, and Android, with Supabase, RevenueCat subscriptions, and Stripe billing.
- Built separate learner and teacher interfaces for contextual reading, student and group management, and sharing.
- Engineered a Spanish reader compiler combining NLP, linguistic rules, and constrained LLM generation to produce tappable words, phrases, and contextual learning cards, with targeted repair and regression evaluations.
- Implemented durable text-processing workflows with persisted progress, failure recovery, and per-stage latency and model-cost tracking.
Mucho Hangouts
Fractional CTO · 2025
- Stabilized messaging, notifications, app state, and authentication in a live React product while the team kept shipping.
- Supported a five-person team, including two junior developers, through code review, pairing, and clearer frontend and backend patterns.
- Nov 2021 — Feb 2024
Senior Frontend Engineer · LeagueApps, later via Nearsure
- Modernized tournament scheduling with React on the company’s first migration team, helping establish shared frontend patterns and components.
- Built drag-and-drop scheduling, conflict detection, and double-booking prevention, reducing organizer scheduling time by 45%.
- Built self-service reporting with AG Grid; used virtualization and memoization for tens of thousands of rows, reducing load and interaction lag by 70%.
- Jan 2019 — Oct 2021
Software Engineer · Capgemini
- Maintained five Java Spring Boot microservices for GE Aviation, collaborating across offshore teams.
- Delivered a reporting module for Disney Cruise Line’s ship and crew management system and executive KPI dashboards for Cisco.
- Reduced automated test-suite runtime by 60%.
- Nov 2017 — Nov 2018
Frontend Engineer · 8base
- Built Jira / GitLab CI/CD automation and refactored 20+ shared UI components into a reusable library, reducing duplicate code by 30%.
About
Hey, I’m Hanif. I’m a Senior Frontend Engineer based in Buenos Aires. I got into programming after Mr. Robot inspired me to learn how to code. Eight years later, I build web and mobile products, including AI tools for business workflows.
After working at 8base, Capgemini, and LeagueApps, I now run HC Studio, where I work with founders and product teams to turn ambiguous ideas into useful, reliable software.
Recently, I helped Genrupt support its first 200 paying customers and took Palabruno from an early prototype to launch across iOS, Android, and web.
I’m especially interested in AI and the future of work. How should workflows, roles, and organizations change as AI becomes part of everyday work? I want to explore that through what I build, thinking about the technology and the people using it together.
Outside of work, I like to lift weights, experiment with AI, and have merienda in cozy coffee shops.
Read my notesBlog
What Is Business Process Management? A SaaS Onboarding Example
Follow a SaaS onboarding example through the six BPM lifecycle phases, from identifying delays to testing a better process.
What Are You Really Installing When You Install a Skill?
Agent skills bundle practical capabilities with assumptions about good work. The doctrine behind a skill should be visible before installation.
Spreadsheet vs. Database: When a Growing Business Needs an Internal Tool
Choose whether to keep your spreadsheet, add controls, use a CRM, inventory system, or work-management platform, or build custom software.