SOFTWAREENGINEER
I build and ship full-stack software from system design to production support. Right now I'm delivering an AI-integrated P&L platform used in enterprise operations and maintaining a workforce product live across 5 retail stores in Sydney.
Experience
Product Users
Owned End-to-End
What I Bring to the Table
End-to-End Delivery
I own full-stack delivery across system design, frontend and backend development, cloud deployment, and post-launch support. At TEN-X, I delivered SAIXAN as the sole engineer, owning the architecture, implementation, deployment, and ongoing operation of a production P&L platform used across internal teams and external clients.
AI-Driven Development
I use AI where it creates clear value in both product delivery and engineering workflow. That includes integrating LLM capabilities into production systems, designing prompts and output handling for reliability, and using tools like Claude to improve development speed without giving up engineering judgement.
Trilingual Communicator
I work across Korean, Japanese, and English in both technical and business settings. I gather requirements directly, align with clients and internal teams without relying on intermediaries, and help teams move faster by reducing communication gaps early in the delivery process.
Cross-Industry Experience
I have built software across enterprise finance, medical imaging, workforce operations, and internal business systems. Working across these environments has taught me how to identify real operational pain points, scope features around actual workflows, and communicate effectively with non-technical stakeholders.
Career Timeline
- Built SAIXAN, an AI-integrated departmental P&L platform now used by 4 internal departments and 3 external companies, giving management real-time visibility into profit and loss across teams.
- Owned the full delivery lifecycle as the sole engineer, including system design, data modelling, API development, React frontend implementation, deployment on GCP / Firebase, and ongoing production support.
- Developed structured workflows for expense claims, approvals, budget vs actual tracking, and reporting, replacing paper-based finance processes.
- Integrated bilingual OpenAI-powered financial querying in English and Japanese, including prompt design, context handling, and structured output processing for production use.
- Adopted Claude for development workflow improvements with reusable prompt templates and prompt caching to reduce API costs and improve output quality.
- Identified recurring payroll and attendance errors in a cafe operation, traced them to hardware-based time cards and manual wage calculation, and proposed a web-based solution suited to the owner's workflow.
- Designed, built, and deployed Bee-Time as a mobile-first workforce management web app, owning product design, frontend, backend, data modelling, and production rollout.
- Replaced physical cards and rental hardware with QR-based attendance tracking, enabling staff to record work and breaks on mobile and view actual worked hours in real time.
- Improved wage accuracy and admin efficiency across 5 stores by giving the owner store-level and employee-level attendance visibility, while reducing hardware and card-related operating costs.
- Built and enhanced a dental X-ray imaging SDK in C++ and Qt, expanding DICOM converter compatibility from 3 to 10+ manufacturers while preserving patient data integrity across PACS integrations.
- Improved ETL reliability through batch workflows, stronger validation, and better error handling, contributing to a 25% increase in product sales.
- Communicated directly with Japanese clients in technical discussions, reducing feedback overhead and improving delivery accuracy without relying on a non-technical intermediary.
- Worked across airline sales, tenant billing, and operational coordination in a high-volume airport environment with complex day-to-day workflows.
- Managed multilingual communication in Japanese, Korean, and English across internal teams and external partners.
- Coordinated the launch of a web page for a newly opened business jet terminal, which sparked an early interest in user-facing digital systems.
Technologies & Tools
Projects & Case Studies
SAIXAN
Used by 4 internal departments and 3 external companies, SAIXAN gives management real-time visibility into departmental profit and loss while replacing paper-based expense workflows with structured digital approvals and bilingual AI-assisted querying.
Bee-Time
Built from firsthand operational insight, Bee-Time replaced error-prone hardware time cards and manual wage calculation with a mobile-first web app now live across 5 Sydney retail stores with 128 active users. It reduced payroll errors, removed hardware rental and card costs, and gave both staff and management real-time visibility into worked hours.
DICOM Image Converter
Expanded compatibility from 3 to 10+ manufacturers, improving interoperability across dental imaging systems and contributing to a 25% increase in product sales. Direct communication with Japanese clients shortened turnaround time and improved delivery accuracy.
Smart Farm AI
Delivered a working end-to-end prototype with real-time object detection, a multi-camera React dashboard, automated abnormal behaviour alerts, and video upload analysis. Demonstrated modular ML-backend-frontend integration as a UTS capstone project.
UTS UniApp
Fully functional dual-interface system handling student enrollment, authentication, and admin operations. Completed with 67 commits across the team.
Academic Background
What People Say
“What stands out about Seoyoon isn't just her engineering. It's the breadth of experience she brings from outside of IT. When we started building SAIXAN, she had no background in accounting or how Japanese P&L structures work, but she picked it up faster than I expected and translated our messy internal logic into a system that actually fits how we run the business. She delivered the whole platform on her own, from architecture to deployment. She's already a strong developer, but what I value most is her potential to keep growing, and how well she understands the business side, not just the code. That's rare, and it makes her easy to work with at the management level too.”
“Working with Seoyoon as a client was honestly easy in the best way. She built exactly what I asked for, but she also thought about how my staff would actually use it and suggested features I hadn't even considered. She delivered on time, no fuss, no surprises. Bee-Time genuinely changed how I run my stores. We used to track everyone's hours with a card-and-ink machine and calculate wages by hand across multiple locations. Now it's all in one place. We saved on hardware costs and got hours of admin time back every week. If I had to sum up her work in one line: clean, accurate, and on point.”
Recommendation coming soon...
Let's Work Together
Based in Sydney and open to remote or hybrid roles. I bring full-stack product delivery, production AI integration, and cross-functional communication to teams building software that solves real operational problems.