Open to Frontend Engineering roles

Hi, I'm Fhillip.
I build the web.

I work as a

I build fast, accessible, user-centric web apps with React, Next.js & TypeScript — and the full-stack depth to ship them end to end.

Dominican Republic · RemoteReact · Next.js · TypeScript
Next.js 15TypeScriptDesign Systems
engineer.ts
Fhillip G. Castillo
FC
Fhillip G. Castillo
Full-Stack · Frontend-focused
About me

Frontend craft,
full-stack range.

I'm a Full-Stack Web Engineer with nearly a decade of experience since 2015, focused on modern frontend. Since 2020 I've specialized in building scalable, user-centric applications with React and Next.js.

My toolkit runs deep — TypeScript, Node.js, Tailwind CSS, and both relational and non-relational databases — so I can own a feature from the UI all the way to the API and cloud infrastructure.

I care about clean, maintainable solutions, strong design-system thinking, and continuously improving how a team ships. I'm looking to bring that to a forward-thinking product team.

0+
Years building for the web
0+
Years deep in React & Next.js
0+
Companies & clients shipped for
0%
Remote-first, async-friendly
Agentic engineering
2+ years in production

I build with AI agents,
not just alongside them.

For the last 2 years I've orchestrated, improved, and shipped real work with agentic AI — making it a core part of how I plan, build, and review code, not a novelty on the side.

01
Orchestrate
Drive multi-step agentic workflows — planning, delegating, and reviewing AI-generated changes across an entire codebase.
02
Improve
Tune prompts, context, and guardrails so agents produce reliable, review-ready output that matches the team's standards.
03
Ship
Fold agentic tooling into day-to-day delivery to move faster without trading away code quality or maintainability.
Claude CodePrimary · daily driver
Augment CodeProduction workflows
CodexIn the mix
agent-session.log
Experience

A decade of shipping, role by role.

From multi-tenant SaaS on Next.js to terabyte-scale search — here's the work that built my range.

Skoolscout LLCNow
Software Engineer I
Frontend lead · multi-tenant SaaS
Jun 2024 — Present
New York · Remote
  • Lead frontend development of SkoolScout on Next.js 14 & 15, delivering smooth multi-tenant functionality and a polished UX.
  • Built a scalable monorepo architecture supporting multiple tenants and client-specific customizations.
  • Created a custom JSON-schema-driven UI Builder to accelerate tenant-specific UI generation.
  • Extended NextUI Pro into reusable components powering the in-house design system.
  • Integrated the frontend with Java Spring Boot services and shipped on AWS (S3, Lambda, API Gateway, CloudFront, Route 53) with Terraform IaC.
Next.js 14-16ReactTypeScriptTailwind CSSReact Hook FormZodAWSTerraformDocker
Independent — Healthcare Platform
Angular Frontend Engineer
Contract · LoopBack 4 backend
Apr 2024 — Nov 2024
Remote
  • Led a scalable Angular web app integrated with a LoopBack 4 backend through to production.
  • Automated API integration with ng-openapi-gen, generating client code from openapi.json to cut manual effort.
  • Configured a Firebase CI/CD pipeline for continuous deployment and faster release cycles.
  • Designed responsive CRUD interfaces for doctors, patients, and consultations.
AngularTypeScriptNode.jsFirebaseLoopBack 4CI/CD
Xometry (via Truelogic)
Software Engineer
Manufacturing marketplace
Dec 2021 — Jun 2023
Remote
  • Optimized existing React features using hooks and styled components for a better user experience.
  • Built a dynamic form editor for efficient data entry and delivery of finalized data.
  • Migrated legacy monolith features to modern React, improving performance and maintainability.
  • Partnered closely with designers to ensure a seamless, consistent experience.
ReactTypeScriptStyled ComponentsReact QueryGraphQLMongoDBDocker
Newfold Digital (via Newtech)
Software Engineer
Web platform engineering
Aug 2021 — Jan 2022
Remote
  • Maintained and enhanced a robust architectural system, improving stability and performance.
  • Analyzed error logs to identify and ship practical fixes aligned with business logic.
ReactJavaScriptC#.NET MVCEntity Framework
Intellisys D. Corp
Sr. Full-Stack Engineer
Condé Nast France · Opsec Security · education & nonprofit platforms
Feb 2015 — Aug 2021
Dominican Republic · On Site/Remote
  • Condé Nast France: built self-styled React components, added CMS features, and migrated legacy pages to modern React.
  • Human Rights training platform: built reusable Vue components and a Canvas-API migration on a PHP/Symfony backend.
  • Opsec Security: engineered a fast query system over a terabyte-scale Elasticsearch dataset, saving thousands monthly in API costs.
  • Delivered real-time UIs across React, Vue, KnockoutJs, and WordPress for a wide range of clients.
ReactVue.jsNode.jsWorkpressC# / .NETKnockoutJsElasticsearchjavascript
Tech stack

Tools I reach for to ship fast.

Frontend is home base, but I'm comfortable owning the API, the database, and the cloud that runs it all.

Frontend
ReactNext.jsTypeScriptJavaScriptTailwind CSSStyled ComponentsReact QueryReact Hook FormZodAngularVue.jsStorybook
Backend & APIs
Node.jsC# / ASP.NETGraphQLREST APIs
Data
PostgreSQLMongoDBMySQLFirebaseElasticsearch
Cloud & DevOps
AWSDockerTerraformLocalStackCI/CDGitHub ActionsWebpack
Education & certifications

Foundations & continuous learning.

B.Sc. Computer Software Engineering
UCATECI — La Vega, Dominican Republic
2010 — 2015
Computer Programming
Cincinnatus Institute of Craftsmanship — Santiago, DR
2014 — 2015
React — The Complete Guide (Hooks & Redux)
Professional certification
2020
English Language & Literature
MESCYT — Dominican Republic
2011
Open to Frontend Engineering roles

Let's build something
people love to use.

I'm looking for my next Frontend Engineering role — ideally React-based, though I'm open to the right team. If that sounds like you, let's talk.