Marcelito Cosicol Jr.

Status

Open to Work

Clients across

🇵🇭 🇬🇧 🇺🇸 🇨🇦 🇦🇺

Hello, I'm Mars

Marcelito
Cosicol

Senior Full-Stack Software Engineer

>

I design and build reliable, performant web applications — modern React/Next.js frontends, clean .NET & Node.js APIs, and efficient ETL data pipelines. 5+ years delivering features for local & international clients across the Philippines, UK, US, and beyond.

  • 0+

    Years Experience

  • 0+

    Projects Delivered

  • 0k+

    Users Served

  • 0x

    Faster ETL

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React
Next.js
TypeScript
.NET / C#
Node.js
Apache NiFi
PostgreSQL
MongoDB
Tailwind CSS
React Native
Docker
Figma
React
Next.js
TypeScript
.NET / C#
Node.js
Apache NiFi
PostgreSQL
MongoDB
Tailwind CSS
React Native
Docker
Figma
About Me

Profile

I build scalable products that blend technical excellence with exceptional user experiences.

Experienced Software Engineer with 5+ years in full-stack development and 3+ years in UI/UX design, specializing in building scalable frontend and backend solutions while crafting intuitive, user-centric interfaces. Proficient in developing responsive, high-performance applications, architecting efficient APIs, optimizing ETL processes, and managing data-driven workflows. Passionate about delivering end-to-end solutions that drive innovation and business growth.

True End-to-End Ownership

From Figma prototypes to REST APIs, data pipelines, and Dockerized production deploys — one engineer across the whole stack.

Proven With Global Clients

Shipped for teams in the Philippines, UK, US, Canada, and Australia, working smoothly across time zones.

Performance-Obsessed

Lean code and optimised data flows — including ETL processes running up to 10× faster.

Designer's Eye

3+ years in UI/UX design means interfaces that are intuitive, polished, and built for real users.

What I Do

Services & Expertise

01

Full-Stack Development

End-to-end web apps — React/Next.js frontends, .NET or Node.js backends, fully integrated and production-ready.

02

Mobile-First & Responsive

Every interface built mobile-first, pixel-perfect across all screen sizes — phones, tablets, and desktops.

03

ETL & Data Pipelines

Design and optimise Apache NiFi data flows, SQL/NoSQL schemas, and ETL processes that run 10× faster.

04

Performance & Speed

Zero bloat, lean code, optimised assets. Apps that load instantly and convert visitors into users.

Career Journey

Work Experience

  1. Feb 2025 — Sep 2026

    Senior Full-Stack Software Engineer — DevOps & UI/UX Designer

    Freelance

    • Independently designed, developed, and deployed complete web applications for a US-based company.
    • Owned timelines, UI/UX, frontend, RESTful APIs, data integration, and end-to-end delivery of scalable, user-focused solutions.
    Next.jsREST APIsDevOpsUI/UXData Integration
  2. Dec 2023 — Nov 2025

    Software Engineer — DevOps / Data Engineer

    Palawan Group of Companies

    • Full-stack software and data engineer specializing in innovative software solutions and scalable data pipelines.
    • Developed high-quality, user-centered applications and drove digital transformation through efficient data engineering and analytics.
    Apache NiFiETLDevOps.NETReact
  3. Apr 2022 — Feb 2025

    Senior Software Engineer & UI/UX Designer

    IT-ERA Technology Solutions

    • Designed user-friendly web applications, dashboards, and reusable, responsive UI components in React and Next.js.
    • Refined flows with prototypes, integrated REST APIs, and deployed a Dockerized app to production.
    ReactNext.jsDockerFigma
  4. Aug 2021 — Mar 2022

    Web Developer

    Elivate IT Solutions

    • Built frontend components from client-provided designs for eCommerce platforms, corporate websites, and ticketing systems for UK-based clients.
    JavaScriptPHPWordPress
  5. Jun 2020 — Dec 2022

    Software Engineer

    Freelance

    • Designed and developed websites and mobile apps using React, Next.js, and React Native.
    ReactReact NativeNext.js
Always Learning

Certifications

#Certification
01Impact Hackathon Online 2020 (National Level) — Top 20 FinalistAug 2020
02Data Management with Apache NiFi
03Python for Data Engineering: Beginner to AdvancedLinkedIn Learning
04Advanced Python: Practical Database ExamplesLinkedIn Learning
05AWS Cloud Essentials for Business Leaders
06Certified Entry-Level Python Programmer (PCEP-30-02) Cert Prep
Tech Stack

Skills & Technologies

Frontend

Fast, accessible, pixel-perfect interfaces.

React.jsNext.jsTypeScriptJavaScriptReact NativeTailwind CSSMUIRedux / ZustandHTML5 / CSS3Framer Motion

Global Reach

Worked with local & international clients

Delivered projects for clients across multiple countries — from local Philippine startups to companies in the UK, US, Canada, and Australia.

🇵🇭PH
🇬🇧UK
🇺🇸USA
🇨🇦Canada
🇦🇺Australia
My Portfolio

Featured Projects

nerdflo.com
01Web App · Mobile App

NerdFlo

A home for everything you read

A knowledge platform where readers save highlights from any website, snap photos of their book notes, see how their ideas connect, and earn by sharing their collections.

  • Web Highlighter — save passages from any site in one click
  • AI Photo-to-Note turns book pages into editable notes
  • Knowledge Lab and book influence maps that connect ideas
  • Note Exchange marketplace with credits and earnings
Full-Stack DevelopmentUI/UX DesignMobile App
Visit NerdFlo
collegeloanpro.com
02Web App

College Loan Pro

College loans done right

Helps students and families compare colleges, estimate financial aid, and project loan repayment — so they can make confident decisions before they commit.

  • Side-by-side college comparison: COA, need met, aid, net cost & shortfall
  • Student Aid Index (SAI) estimator feeding every calculation
  • Loan planning with a full funding breakdown (Stafford, Parent PLUS)
  • Interest rate lookup, CORE Method guidance, and an admin dashboard
Full-Stack DevelopmentUI/UX DesignREST API
Visit Site
insidecollegeaid.com/admin/dashboard
03Web App

College Aid Plan

FAFSA & CSS Profile practice platform

A platform where students practise the FAFSA and CSS Profile forms before submitting the real thing, backed by an admin dashboard for schools, scholarships, and cost-of-attendance data.

  • 3,600+ practice FAFSA forms submitted by 3,200+ unique users
  • Practice FAFSA & CSS Profile flows with form viewers
  • Admin tools for schools, scholarships, COA submissions & tooltips
  • Designed in Figma, built end-to-end, and deployed to production
UI/UX Design (Figma)Frontend DevelopmentREST APIDeployment
Visit Site
placesinsights.navagis.com
04Websites

Navagis Websites

Google Maps Platform partner sites

A family of marketing sites for Navagis, a Google Cloud & Google Maps Platform partner — covering location intelligence, fleet management, and a localized site for the Vietnam market.

  • Places Insights — POI data product powered by Google Maps Platform
  • NavaFleet.ai — end-to-end fleet visibility platform site
  • Navagis Vietnam — fully localized Vietnamese-language site
Web DevelopmentResponsive UILocalization
Places InsightsNavaFleetVietnam

19+

Projects listed

7+

Web apps & platforms

11+

Client websites

4+

Mobile apps

Also Worked On

More Projects

On the go

Mobile Applications

Plus 10+ confidential projects — including enterprise data pipelines and internal systems that can't be shown publicly. Happy to walk through them in an interview.

Let's Connect

Contact Me

Call Me

(+63) 939 750 9659

Available Mon–Fri, 9AM–6PM PHT

Email

mcosicoljr@gmail.com

I respond within 24 hours

LinkedIn

Marcelito Cosicol

Let's connect professionally

Facebook

facebook.com/mcosicoljr

Send me a message anytime

Ready to build something great?

Let's work together

I'm open to full-time roles, contract projects, and freelance engagements. Let's discuss how I can add value to your team.

Get In Touch Download CV