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Product & Software Engineer

Building high-performance, accessible, and interactive web experiences with React, Next.js, and modern tooling.

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Valentinus Kenji — Product and Software Engineer based in Jakarta

About

Product-focused technologist building scalable digital experiences.

I have hands-on experience leading digital products from concept to launch in fast-paced startup environments. I translate user insights, data, and business goals into scalable, high-performing solutions.

My technical expertise spans JavaScript (Node.js, React, Next.js, Vue.js), Firebase, REST APIs, Swift, and Java. I’m also experienced in data analytics, sentiment analysis (BERT, K-Fold Validation), AI moderation, and workflow automation.

Beyond technical skills, I bring expertise in product roadmaps, lifecycle management, Agile/Scrum, growth analytics, and go-to-market strategy.

3+

Years Experience

15+

Projects Shipped

10+

Companies / Clients

Experience

Where I’ve Worked

Dec 2024 – Present

Jakarta, Indonesia

Product & Business Development

Kreate

Co-Founded a creator monetization platform, overseeing strategy, product roadmap, and go-to-market execution.

  • Conducted competitor and market analysis to define positioning, core features, and growth strategy
  • Collaborated with a 6-person cross-functional team, aligning engineering, design, and operations
  • Integrated AI-powered moderation with 99.8% accuracy (tested on 10K+ messages)
  • Cut operational costs by ~40% while increasing creator acquisition

Dec 2022 – Present

Remote

Freelance Full-Stack Developer & Product Manager

Multiple International Clients

Scoped, built, and deployed responsive web and mobile products using React, Next.js, Swift, and Firebase.

  • Delivered reusable component libraries to improve delivery speed and consistency
  • Integrated RESTful APIs and optimized backends for scalability and performance
  • Utilized generative AI tools for prototyping and automation in client projects

Jun 2025 – Jan 2026

Jakarta, Indonesia

Backend Developer & Product Revamp

Rintisan Teknologi Waralaba

Collaborated with the CTO to design and deploy backend systems and APIs for POS and business platforms.

  • Owned a full product revamp initiative, from requirements and architecture to testing and release
  • Managed multiple product lines in parallel, ensuring smooth delivery across features
  • Enhanced performance through data-driven monitoring, query tuning, and error logging

Mar 2024 – Dec 2024

Jakarta, Indonesia

iOS Developer & Product Management Intern

Apple Developer Academy

Developed 5 iOS apps in cross-functional Agile teams, focusing on user feedback and design iteration.

  • Adopted Clean Architecture principles for modular, maintainable codebases
  • Presented product prototypes and MVPs in stakeholder demos and usability tests

Tools

Tech Stack

The tools and technologies I use to bring ideas to life.

UI/UX Design

  • Figma
  • Pixso
  • Framer

Web Development

  • React
  • Next.js
  • Vue.js
  • Tailwind CSS

Mobile

  • SwiftUI
  • Swift
  • iOS

Backend

  • Node.js
  • Firebase
  • Supabase

Machine Learning

  • TensorFlow
  • BERT

No-Code

  • Webflow
  • Framer
  • Bubble
  • Shopify

Contact

Let’s build something
together.

Have a project in mind? I’d love to hear about it.

Get in Touch