Gerson Calienes.
software_engineer · fractional_cto · founder@w10t
Software engineer and fractional CTO with ten years shipping production Next.js, React Native, and AI-powered products. I run W10 Tech, a small design and build studio — available for engagements across the US and remote worldwide.
How I got here.
I started building websites out of curiosity. That curiosity turned into a career — first as an engineer on consumer healthcare products used by millions, then on AI-native apps, and eventually on my own studio.
Along the way I learned that software gets good not from any one technology, but from small teams with clear ownership shipping in tight loops. That's the model W10 Tech is built on.
I still write code every day. I read, I teach, and I try to keep the gap between "have an idea" and "see it running" as short as possible — both for my own projects and for the clients I work with.
Work history.
- 2015→
Consumer healthcare at scale
Shipped drug information portals and provider directories at Everyday Health — React/Next.js front-ends serving millions of monthly visitors with heavy SEO and accessibility constraints.
- 2022→
Founded W10 Tech
Started a small design and build studio. Took on engagements for web, mobile, and AI-powered products — working directly with founders instead of through layers.
- 2024→
AI-native products
Built Gym Elite AI (an AI-coached fitness platform on React Native + NestJS) and a handful of LLM-powered internal tools. Focused on shipping AI features that hold up outside of a demo.
Tools I reach for.
- ·TypeScript
- ·React
- ·Next.js
- ·Tailwind
- ·React Native
- ·Node.js
- ·NestJS
- ·Python
- ·FastAPI
- ·Prisma
- ·AWS
- ·Vercel
- ·Docker
- ·Postgres
- ·CI/CD
- ·OpenAI
- ·Anthropic
- ·RAG
- ·Agents
- ·Embeddings
Let's talk.
Studio engagements go through w10t.com. For anything else — questions, collaboration, a quick hello — I'm easy to reach.