Open to opportunities

Lennar de la Puerta

@lennardelapuerta

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Senior Frontend Developer specializing in React, TypeScript, and full-stack web application delivery.

Philippines

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What I'm looking for

I seek roles where I can build user-focused frontend experiences, lead technical migrations, mentor teams, and work in agile, product-driven environments that value quality and growth.

I am a highly dedicated Full Stack Software Engineer with extensive experience in web, enterprise, and mobile application development, focusing on frontend excellence with React, React Native, NextJS and TypeScript while maintaining secure, performant back ends with NodeJS and Elixir.

I have led teams and delivered production-grade products used by organizations and government (LMS adopted by institutions and DICT), transitioned from outsourced contributor to full-time Senior Frontend Developer at GroupM, and consistently drive code quality, migration efforts (MUI4→MUI5), analytics integrations, and TypeScript adoption to improve maintainability and reliability.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Developer

Current

GroupM

Oct 2023 - Present (2 years 5 months)

Transitioned from outsourced contributor to full-time Senior Frontend Developer, implemented TypeScript and migrated MUI4 to MUI5, and integrated Google Analytics to improve insights and maintainability.

ReactJS TypeScript Google Analytics Frontend Architecture UX UI Redux

React Developer

iScale Solutions

Oct 2021 - Sep 2023 (1 year 11 months)

Outsourced to GroupM to build an advanced brand intelligence web application and an admin dashboard for the INCA Project, streamlining data maintenance and campaign planning workflows.

ReactJS JavaScript Dashboards Data Management UX REST APIs Redux

Full Stack Software Engineer

StackTrek Enterprises Inc.

Apr 2019 - Oct 2021 (2 years 6 months)

Designed an LMS adopted by institutions and DICT, built a code-assessment app for applicant evaluation, centralized user management, and led a development team while implementing E2E and unit testing.

ReactJS Elixir Phoenix PostgreSQL NodeJS Authentication CI CD

Part-time Software Engineer

StackTrek Enterprises Inc.

Jan 2019 - Mar 2019 (2 months)

Developed an in-house developer networking platform and resolved critical bugs to improve stability and deployment processes for company applications.

ReactJS FeathersJS NodeJS Deployment web app development

Bootcamp Mentor

StackTrek Enterprises Inc.

Oct 2018 - Dec 2018 (2 months)

Mentored and prepared tech professionals and IT students through a skill-upgrade bootcamp, developed curriculum and hands-on JavaScript exercises to boost industry readiness.

Mentoring Curriculum Development JavaScript Training