About

Agustinus Nathaniel

Product Engineer who builds end to end — from what users see to what runs underneath. I've shipped products from prototypes to production at startups and scale-ups, and helped teams ship faster along the way.

Started out building the parts users see. Curiosity about how everything connected pulled me deeper — through systems, infrastructure, and into leading teams. Still figuring things out as I go.

How I Work

I tend to ask what we're actually solving before deciding how. I care about sustainable code, fast feedback loops, and tools that get out of the way. Read more about my principles and setup.

Recent Focus

Lately: TypeScript, React Native, Expo, and making teams faster through better tooling. Also figuring out how AI-assisted development fits into how we build.

Experiences

  • Finsoft

    Jakarta, Indonesia | Fintech Enabler | Acquired by Reliance Capital Management

    Tech Lead (Product Engineering), Founding Team Member

    Feb 2023 - Oct 2025

    • Founding engineer. Established frontend architecture for web and mobile using TypeScript, React, and React Native/Expo.
    • Led hiring and onboarding for the engineering team. Mentored the team on architecture decisions and code quality.
    • Shipped multiple products from scratch: financing platform, investment community app, loan management dashboard, and insurance dashboard.
    • Improved build times by 2x and reduced infrastructure costs by 60% through tooling and CI/CD optimization.
    • Worked closely with product and design to define user journeys and prioritize features that actually moved metrics.

  • Pinhome

    Jakarta, Indonesia | Property Technology | Series B | 500+ Employees

    Senior Software Engineer

    Jul 2021 - Jun 2023

    • Part of the Mortgage Tribe. Built and maintained mobile and web apps for property solutions using Flutter and Next.js.
    • Improved CI/CD pipelines and raised test coverage significantly.
    • Designed and implemented a reusable smart widget SDK for the mobile app, used across multiple features.
    • Contributed to the internal Design System — React components for web, Flutter for mobile.
    • Mentored junior engineers and promoted product-minded engineering practices.

  • SIRCLO

    South Tangerang | E-Commerce Enabler | Series C | 1000+ Employees

    Software Engineer

    Jul 2020 - Jun 2021

    • Built and maintained React + TypeScript applications integrated with GraphQL.
    • Developed GraphQL layers for optimized data fetching across multiple products.
    • Contributed to storefront template development kits used for merchant onboarding.
    • Created reusable, scalable frontend components used across the product suite.

Testimonies

What colleagues and teammates say about working with me.

  • [redacted]

    Product Designer @Stealth Startup

    2023-2025

    Nathan’s leadership is excellent, he manage the team effectively, always provide room for discussion, is open to ideas and feedback, and respond quickly to necessary improvements.

  • [redacted]

    Frontend Engineer @Stealth Startup

    2023-2025

    Nathan’s leadership has been very strong - he provided clear direction, managed priorities well, and created a supportive environment that helps the team stay productive and motivated. He also encourage collaboration and give room for others to contribute their ideas, which I really value.

    Nathan communicate with the team very effectively, his directions are clear, and he make sure everyone understands their priorities. He’s also approachable, which makes it easy to raise questions or concerns.

  • Dennis Tan

    Software Engineer

    2022-2023

    Nathan is a very organized and intelligent engineer, always think more about optimization, and try to look from multiple point of views regarding a product. Over the course of his career in pinhome, he has standardized our workflow in Ares squad, made a lot of documentation to help other fellow engineers. He also discussed alot with the products to confirm and ensure there is no mistake when delivering a product. A good role model for any other engineers.

  • Denaya

    Software Engineer

    2022-2023

    Nathan is such an excellent teamplayer with great positive and humble personality. His passion is his secret weapon. It’s what sets him apart from the rest and makes him shine. I’ve never seen anyone so in love with what they do, and it’s inspiring as hell. Keep rocking it, Than!

  • Carissa Alanda

    Product Manager

    2022-2023

    Collaborating with Nathan has been nothing but a blessing. Not only he delivers his tasks in timely manner, but he would ask many questions prior development to ensure that he could build something that can help us reach the goal. As PM, these traits help me tremendously as I could rely on Nathan for any technicalities so that we can come up with other that meets the business goals while maintaining the user needs.

  • Tsasqa Galih

    Senior Product Manager

    2021-2023

    Nathan will be an excellent addition to any companies, teams, or even as a partner. He’s dependable as a Team Member, Inspiring as a co-worker, and a great friend outside of professional work. Excellent in Engineering knowledge and have that drive and thirst to keep on pursuing knowledge, both from his expertise and outside.

  • Hanif Agung Prayoga

    Software Engineer

    2021-2023

    Nathan is a really outstanding engineer. Knowing him for about 2 years, I can say that he really is passionate about software engineering and building products in general. He’s done his job well, actively giving out suggestions about development and can pinpoint a lot of issues. He was a huge help during our working years together and I’m really thankful for his presence and impact.