William
Sanjaya Kesuma

Bridging business strategy and technical execution. I specialize in translating client needs into delivered outcomes, backed by hands-on experience in AWS cloud and iOS development.

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William Sanjaya Kesuma

People
Business
Tech

Bachelor of Computer Science at Universitas Ciputra Surabaya (Cum Laude, GPA 3.71) and a graduate of the Apple Developer Academy @ UC.

My work centers on connecting business goals with technical solutions — leading cross-functional teams, managing stakeholders, and translating what clients actually need into plans that get delivered. I've supervised teams of ~10 through international partnership and events programming, represented my Apple Developer Academy cohort to visiting institutional leadership, and spoken at TEDx and university training sessions to audiences of 50+.

I back that with real technical range: end-to-end iOS product development with Swift and SwiftUI, AWS cloud infrastructure, and data analysis — not as a separate identity, but as the thing that lets me sit in a room with engineers and actually understand the constraints, not just document them.

What drives me is the gap between technology and the people who use it. I'm at my best at that intersection — bridging a dev team and a client, turning messy requirements into a clear plan, or building the trust that gets a partnership or a deal across the line.

10+
Team led
5+
Shipped projects
3.71
GPA / 4.0

Where I've Worked

Axrail.AI · Malaysia
Jan – Apr 2026
Business Analyst & Cloud Engineering Trainee

Hands-on learning with AWS through self-study and a personal sandbox project, then led business analysis on a 3-person team building an internal gadget/IT-asset tracking tool for Axrail's HR department — from client discovery through UI build and QA handoff.

Explored AWS documentation and developed using AWS. building the a personal sandbox app touching 25+ Lambda functions alongside DynamoDB, Cognito, and API Gateway. On the client project, worked as the BA on a 3-person team (myself, one developer, one QA) building a tool for Axrail's own HR team.

  • Led client discovery with Axrail's HR team and defined the PRD for a gadget/IT-asset tracking tool.
  • Directed UI development and cross-checked every feature against the PRD before QA handoff.
  • Built hands-on AWS serverless experience (25+ Lambda functions, DynamoDB, Cognito, API Gateway) via a personal sandbox project while studying for the AWS Certified Developer Associate exam.
  • Presented the finished product to Axrail's Solutions Architect, managers, and the client rep — team was awarded "Best Team" for a fully working, bug-free product.
Apple Developer Academy @ UC · Indonesia
Mar – Dec 2025
iOS Developer · Intern

Served as project manager on 4 of 6 Challenge-Based Learning projects, leading teams of ~5 from concept to delivery, and built 5+ apps across iOS, iPadOS, and macOS in Swift.

Across six Challenge-Based Learning projects — from early concept and UI/UX exploration through a 2-month real client engagement with PT. Ciputra Group — led as project manager, ran stakeholder discovery, and built out the apps in Swift/SwiftUI, including representing the 2025 cohort as spokesperson during visits from institutional leadership.

  • Led development of Pelican, a building-maintenance tracking and assignment app, through 2 months of stakeholder engagement with PT. Ciputra Group.
  • Ran client discovery for Menata, an interior design/3D modeling app, as both PM and developer; shipped a working demo to interior designers.
  • Project-managed and partially developed CatatIn, a personal finance organizer, published on the App Store.
  • Project-managed fillé, a casual game, also published on the App Store.
Universitas Ciputra · Indonesia
Aug 2024 – Oct 2025
Coordinator of Communications & Partnership

Served as primary liaison for 5+ visiting deans and directors from partner universities, and supervised teams of ~10 across 10+ webinars and events for 200+ guests.

Acted as first point of contact for international visitors to the university, including 2+ MOU signings and 5+ institutional visits, while coordinating study excursions for 6+ partner universities and 45+ visiting international students throughout their stay in Indonesia.

  • Primary representative for 5+ deans and directors of international partner universities, including 2+ MOU signings.
  • Supervised teams of ~10 for 10+ webinars and events of 200+ guests.
  • Coordinated study excursions and served as main point of contact for 45+ international students from 6+ partner universities.

Selected Work

Business Development · Stakeholder Management · Partnerships

International Partnership Development

Built and maintained relationships with visiting international university leadership to grow a university community's partner network.

International partners need a single trusted point of contact before they'll commit to a formal partnership. As the university's liaison for visiting deans and directors, I owned the relationship end-to-end — from first contact through the visit itself — building the kind of trust that gets MOUs signed and turns a one-time visit into a returning partner.

  • Sole point of contact for visiting university leadership
  • Directly contributed to MOU signings between partner institutions
  • Built relationships that led to repeat visits from partner universities
iOS · RoomPlan · RealityKit

Menata - 3D Tools for Interior Designers

An iOS app that helps interior designers scan real rooms and objects into accurate 3D models and arrange them in an interactive shared space.

Interior designers lose hours manually preparing 3D assets and room layouts. To solve this, I combined three Apple frameworks into a single workflow: RoomPlan to generate dimensionally accurate room layouts, Object Capture to turn real-world furniture into 3D models via camera, and RealityKit to let designers arrange everything in a shared, interactive 3D space.

  • Room scanning via Apple's RoomPlan API
  • Real-world object-to-3D-model capture
  • Interactive scene composition with RealityKit
  • View on GitHub →
AWS · CDK · Serverless

AWS Serverless Command Center

A personal sandbox project — a serverless system on AWS built to learn how AWS services actually work together.

I wanted hands-on AWS experience beyond documentation, so I built a serverless system touching 25+ Lambda functions alongside DynamoDB, Cognito, and API Gateway — using it to test how these services interact end-to-end while studying for the AWS Certified Developer Associate exam.

  • 25+ Lambda functions across a serverless architecture
  • DynamoDB, Cognito, and API Gateway integration
  • Built while studying for the AWS Certified Developer Associate exam
  • View on GitHub →
Python · Time Series · Research

Modeling & Forecasting NASDAQ-100 Stock Prices with ARIMA & SARIMA

Undergraduate thesis comparing two forecasting models across five NASDAQ-100 tech stocks to identify which approach holds up best for short-term price prediction.

Investors and analysts need forecasting models they can trust, but model choice is often made on convention rather than evidence. I benchmarked ARIMA against SARIMA on four years of daily data for AAPL, NVDA, MSFT, GOOGL, and AMZN, testing for seasonality and comparing accuracy - all model runs landed under 2% MAPE, rated "Highly Accurate" by the Lewis (1982) standard.

  • Benchmarked across 5 NASDAQ-100 tech stocks, 4 years of daily data
  • All models under 2% MAPE ("Highly Accurate" per Lewis 1982)
  • ARIMA preferred for parsimony given no significant weekly seasonality
  • Defended and passed with revisions
Python · JavaScript · Game Dev

More Work

Additional projects including a SwiftUI hypercasual game and an iTunes-API music player, plus everything else across iOS, AWS, and data work.

What I Work With

Recognition & Speaking

2024 – 2026

Recurring Guest Speaker

Universitas Ciputra Surabaya

Engaged as a periodic speaker for university events reaching audiences of 50+ students. Delivered foundational keynotes on Leadership & Team Dynamics (2024-2025) and specialized seminars on the practical applications of Artificial Intelligence (2026).

May 2025

TEDxUniversitas Ciputra Student Speaker

Universitas Ciputra Surabaya

Led an interactive session on Growth Mindset & Resilience for 50+ attendees, including students, business owners, and professors.

November 2024

Most Outstanding Business and Societal Innovation

TAR UMT Malaysia ISPARK International Pitching Competition

Analysed market gap and designed Eco-Straw biodegradable straw alternative from fruit peel waste; pitched to 11 international judges, outcompeting 27 teams across 7 countries.

Certifications

Issued Jan 2026 · Expires Jan 2031

App Development with Swift - Certified User

Certiport · A Pearson VUE Business

IELTS English Proficiency Test

IELTS Official · 7.5 band score

Issued Jan 2026 · Expires Jan 2029

Programming Certification

BNSP Indonesia

Issued Jan 2026 · Expires Jan 2029

UI/UX Certification

BNSP Indonesia

Available for opportunities

Let's build something
great together.

Open to full-time roles, freelance projects, and collaborations.