Open to opportunities

Joanita Timbin P

@joanitatimbinp

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Backend-focused developer building reliable, secure systems for fintech.

Indonesia

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What I'm looking for

I’m looking for a backend-focused role where I can build reliable, secure systems—especially for scalable digital financial services. I want opportunities to deepen Node.js backend development and strengthen real-world security and data integrity.

I’m a final-year Informatics Engineering student with strong foundations in programming logic, database concepts, and secure system design. I’ve already applied these skills through a thesis and hackathons, where I learned by building and iterating quickly.

I designed a decentralized ticket verification system using ECDSA digital signatures and EIP-712 structured data signing, including digest hashing and deadline validation to reduce replay attacks. I also prototyped a blockchain-based ticketing solution in a Lisk Builder Challenge hackathon, contributing to wallet integration and system interaction logic.

Right now, I’m deepening backend development skills with Node.js through self-directed learning and open-source community resources. I’m interested in building reliable backend systems that support scalable digital financial services, with security and data integrity as core priorities.

Experience

Work history, roles, and key accomplishments

Secure NFT Ticketing dApp

Undergraduate Thesis Project

Sep 2025 - Feb 2026 (5 months)

Designed a decentralized ticket verification system using ECDSA digital signatures and EIP-712 structured data signing. Implemented digest hashing and deadline validation to reduce replay attacks and unauthorized access.

EIP 712 Digital Signatures Replay Attack Mitigation Distributed Systems Git

SRD Leadership Coordinator

Student Research Development (SRD)

Jun 2024 - Aug 2025 (1 year 2 months)

Led a team organizing academic support programs and additional learning sessions for the SRD division. Coordinated schedules, learning materials, and communication with faculty and senior students to support effective delivery.

Leadership Program Planning Scheduling Communication Team Management

Lummy Ticket Hackathon

Lisk Builder Challenge Hackathon

Apr 2025 - May 2025 (1 month)

Collaborated in a hackathon to prototype a blockchain-based ticketing solution and contributed to wallet integration using Xellar Kit. Worked in a Git-based workflow to iterate rapidly and prepare a product pitch.

Xellar Kit Git Flow GitHub

SRD Division Member

Student Research Development (SRD)

Feb 2023 - Jun 2024 (1 year 4 months)

Managed budgeting and financial reporting for academic workshops and seminars, serving as Treasurer for a leadership workshop. Ensured 100% compliance with financial guidelines and produced regular reports highlighting budget status and variances.

Budgeting Financial Reporting Compliance Management Stakeholder Management

Education

Degrees, certifications, and relevant coursework

Bunda Mulia University

Undergraduate, Informatics Engineering

2022 -

Grade: GPA 3.73/4.00

Activities and societies: Relevant coursework: Software Engineering (food delivery app UI/UX using Figma); Web & Mobile Development (responsive apps with HTML/CSS/JavaScript); Database Systems (relational SQL database design and implementation for PT Bintang Cahaya Plastik).

Undergraduate Informatics Engineering student (GPA 3.73/4.00) with coursework in software engineering, web & mobile development, and database systems. Completed projects including a food delivery app UI/UX design and a relational SQL database system for PT Bintang Cahaya Plastik.