sai@bristol:~$ whoami

Developer-turned-data-scientist building measurable, data-driven products.

I’m Sai Kaung Khant Zaw, a developer-turned-data-scientist based in Bristol, UK (open to relocation). I build forecasting models, scheduling systems, and data products end to end — and I measure what they actually change.

Sai Kaung Khant Zaw
1 → 4.6★
App Store rating, Heal by Pun Hlaing
−50%
User complaints, same rebuild
100k+ / 40%
EMR records standardised / faster retrieval
MSc Data ScienceDistinction, University of the West of England

01Selected work

Data and ML projects, end to end.

AI-Powered Fair Shift Scheduling System

2024

MSc Dissertation

Screenshot from AI-Powered Fair Shift Scheduling System

Manual shift rotas at hospitality and retail sites routinely produced unfair distributions of unpopular shifts, driving staff dissatisfaction and turnover.

FastAPIMongoDBVue.jsProphetFigma
Case study — role, decisions, result

Role

Sole researcher and developer — problem framing, forecasting model, scheduling engine, and UX validation.

Key decisions

  • Used Prophet to forecast demand and staffing needs from historical shift data rather than relying on fixed rosters.
  • Built a custom constraint-based scheduling engine instead of an off-the-shelf solver, because existing solvers could not hold the real fairness and availability constraints gathered from staff.
  • Designed the scheduling UI in Figma and validated the concept with a staff survey before building the working prototype.

Result

Delivered a working system that generates rotas balancing forecasted demand against fairness constraints, validated against real staff feedback rather than assumptions.

Starbucks Task-Tracking Bot

Ongoing

Self-initiated, in production

Screenshot from Starbucks Task-Tracking Bot

Shift handovers at a high-volume airport store relied on verbal handoffs and paper notes, so tasks were regularly missed or duplicated between shifts.

PythonStreamlitSupabasePostgreSQLWhatsApp API
Case study — role, decisions, result

Role

Built and deployed independently, alongside day-to-day operational duties.

Key decisions

  • Chose WhatsApp as the interface since it required zero training or new habits from staff already using it daily.
  • Used Supabase/Postgres as a lightweight, low-maintenance backend suited to a small team rather than standing up dedicated infrastructure.
  • Added a Streamlit dashboard for managers to review task history without needing database access.

Result

In active use for logging and tracking shift-handover tasks, reducing dropped handoffs between shifts.

EV Charging Infrastructure App

2024

Personal project

Screenshot from EV Charging Infrastructure App

Identifying good locations for new EV charging stations requires reasoning about geographic coverage and demand density, not just plotting existing stations on a map.

FlutterMongoDBUber H3
Case study — role, decisions, result

Role

Sole developer — geospatial analysis, backend, and mobile app.

Key decisions

  • Used Uber's H3 hexagonal grid system to bucket geography into uniform cells, making coverage gaps and demand density directly comparable across a region.
  • Modelled station and grid-cell data in MongoDB to keep geospatial queries flexible during exploratory analysis.

Result

A working mobile app that surfaces candidate siting locations for new charging infrastructure based on grid-cell coverage analysis.

Heal by Pun Hlaing

2022–2023

Employer work · Pun Hlaing International Hospitals

Screenshot from Heal by Pun Hlaing

The hospital group's patient-facing app had a 1★ App Store rating and a high volume of user complaints, undermining trust in an otherwise capable care network.

FigmaMiracle EMRKotlinSwift
Case study — role, decisions, result

Role

Mobile Application Analyst & Data Analyst — led the rebuild of the patient app and standardisation of EMR data behind it.

Key decisions

  • Ran a structured review of complaint data to prioritise fixes by actual patient impact rather than assumption.
  • Redesigned core flows in Figma before touching code, validating changes against real complaint themes.
  • Standardised over 100,000 EMR records against Miracle EMR to make patient data faster and more reliable to retrieve inside the app.

Result

App Store rating rose from 1★ to 4.6★, user complaints fell by 50%, daily active usage grew 35% within three months, and patient satisfaction scores rose from 60% to 85%.

Other work

Sai Sai Pay

ACE Data Systems

Mobile payments app shipped inside a 2-week deadline. 4.3★ on Google Play, 5.0★ on the Apple App Store.

UAB Pay & UAB Pay Plus

ACE Data Systems

Banking and payments apps built for UAB.

Brycen car booking app (beta)

Brycen Myanmar

Car booking app beta that drove a 20% increase in user retention.

Shal GO

Attractive Myanmar

Explore and connect on the go-to social network for travelers.

02Experience

From Android developer to data lead.

  1. Sep 2023 – Present

    Duty Manager

    Starbucks (SSP), Bristol Airport

    Leading shift operations in a high-volume travel-retail environment while completing an MSc in Data Science. See case study →

  2. Jan 2022 – Jun 2023

    Mobile Application Analyst & Data Analyst

    Pun Hlaing International Hospitals

    Rebuilt the patient-facing app and standardised EMR data behind it — full case study below. See case study →

  3. Jan 2021 – May 2021

    Senior React Native Developer & Data Lead

    Shal GO

    Led mobile development and data workstreams.

  4. Nov 2019 – Dec 2020

    React Native Developer

    ACE Data Systems

    Built payments apps including Sai Sai Pay, UAB Pay, and UAB Pay Plus.

  5. Feb 2019 – Oct 2019

    Android Developer

    Brycen Myanmar

    Built the car booking app beta.

03Education & certification

Formal grounding, kept current.

MSc Data Science — Distinction

University of the West of England, Bristol

Sep 2023 – Nov 2024

BEng Information Technology

West Yangon Technological University

Completed Dec 2018 · GPA 4.4 / 5.0

Certifications

  • Python for Data ScienceELYSIAN
  • Statistics for Data Science & Data AnalyticsAce of Data
  • Professional Diploma in Java ProgrammingCDAC
  • Professional Certificate in Android ProgrammingCDAC
  • Professional Android Developing CourseFairway Technology
  • C++M3WI
  • Project ManagementYMT
  • Professional Graphic DesignGCTI

04About

Beyond the CV.

Born and raised in Yangon, Myanmar, I got into computers around age seven and never really stopped. I spent most of my career as a mobile and full-stack developer before pivoting deliberately into data science — I wanted to work on the decisions behind the product, not just the interface on top of it.

Outside of work, I hold a black belt in Taekwondo and also train in kickboxing, play guitar, and cook Burmese, Thai, and Chinese food. I'm based in Bristol, UK, and open to relocating for the right role.

05Contact

Let’s talk about your data team.