Kaung Sat Hein Portfolio and Backend-Focused Full-Stack Developer
Kaung Sat Hein
Backend-Focused Full-Stack Developer
I build scalable backend systems and production-ready APIs for real business workflows.
Focused on business logic, performance, reliability, and integrations across HR, recruitment, payroll, permissions, and internal platforms.
Scale
100K+ concurrent users
Reach
Systems used across 8 countries
Built Across
ATS, Expense, KPI, CMS, RBAC, and workflow automation
About Me
A quick introduction to how I work, what I build, and the kinds of engineering problems I enjoy solving.
Profile
Backend-focused full stack developer specializing in designing scalable, workflow-intensive business systems and high-performance backend architectures.
Proven experience building and maintaining HRMS, ATS, payroll, and internal platforms supporting 100K+ users across multi-country environments, with a strong focus on data consistency, system reliability, and operational scalability.
Skilled in domain-driven design, RBAC systems, multi-level approval workflows, and complex business logic modeling, enabling robust enterprise-grade applications. Strong background in performance optimization through query design, indexing, caching, distributed system patterns, and API architecture.
Experienced in integrating AI-powered features, third-party services, and event-driven workflows, delivering efficient, maintainable, and production-ready systems.
Contact Information
Phone
+959 788907030Location
Yangon, Myanmar
Focus
Backend, integrations, and scalable systems
Portfolio
kaungsathein.onlineSkills & Expertise
Core tools, engineering strengths, and delivery areas I rely on to build products that are secure, scalable, and usable.
Building robust application logic, service layers, and production-ready backend architectures.
Crafting responsive interfaces with modern frontend patterns focused on clarity and usability.
Designing efficient data models and improving performance across transactional and cached systems.
Designing API layers with practical authentication, authorization, and secure integration flows.
Supporting delivery pipelines, cloud services, and deployment tooling that keeps products moving.
Connecting products with third-party services, payments, messaging channels, and business systems.
Orchestrating async jobs, serverless events, and resilient automation across product workflows.
Exploring AI-powered features that turn language models and retrieval into useful product flows.
Featured Work
A selection of production systems, platform features, and architecture-driven work that reflects how I design, build, and scale backend-focused applications.
Projects
Backend-led product work shaped by business rules, integrations, scale, and production delivery.
- • Core HR operations needed to scale across eight countries on one shared platform
- • Features such as Expense, KPI, Permission Group, and Indonesia Payroll introduced very different business rules and access patterns
- • Performance and data consistency mattered because these modules were used in daily business operations at large scale
- • Manual CV handling slowed down recruiter workflows and created inconsistent candidate records
- • Recruitment stages needed clearer backend state transitions from Screening to Offer
- • Candidate data had to stay aligned between ATS workflows and downstream HRMS records
- • Each country homepage needed its own page structure and multiple configurable sections
- • Content blocks had to support jobs, companies, and quick-search terms from different data sources
- • Filtering and curation logic needed to handle complex unlimited AND/OR conditions for collections
- • Job discovery and application flows needed to feel smooth for end users, not just operationally correct
- • Authentication had to support both SSO and email login for different applicant preferences
- • Applicants needed a single place to manage applications and inbox communication after applying
- • OTP delivery had to work across Thailand SMS, Vietnam SMS, and email-based verification paths
- • Authentication and payroll authorization could not depend on fragile one-off integrations
- • Middleware had to handle external service communication without breaking core business flows
- • Customer operations required domain-level control instead of loose manual handling
- • Different lifecycle steps had to stay aligned with tools such as Xero, Monday, and Notion
- • The backend had to support internal business operations across multiple countries in one system
- • The agent needed backend operations it could call reliably for real HR-related actions
- • Queries and mutations had to map cleanly into HR workflows instead of relying on loosely structured responses
- • Released product behavior required stronger backend support than a prototype-style assistant
Feature Highlights
Focused breakdowns that show architecture thinking, workflows, and data modeling behind key features.
- • Upload CV and extract structured applicant data with AI
- • Populate profile cards with bio, education, experience, skills, languages, certificates, and social links
- • Notify HR stakeholders and invite new applicants into Job Landing when needed
- • Role-based use cases and permissions
- • Clear request and approval status definitions
- • Business rules for category and approval lifecycle
- • Create KPI groups and reusable KPI structures for different teams or roles
- • Assign KPI targets to individual users with clear ownership and status visibility
- • Support manager review, admin oversight, export workflows, and mobile access
- • Manage permission definitions and map them into reusable groups
- • Restrict manager visibility by department, position, location, and status scope
- • Reduce one-off access maintenance by standardizing visibility rules through grouped structures
- • Combine taxable monthly salary elements into yearly gross income
- • Separate taxable earnings from non-taxable payroll items before calculation
- • Use annualized income as the basis for later PPh 21 computation
Work Experience
A stepped journey through the roles, teams, and responsibilities that shaped my backend engineering growth.
Web Backend Developer (Trainee)
Web Backend Developer
Senior Full-Stack Developer
Better HR
Yangon, Myanmar
Started with backend fundamentals, delivery flow, and production support.
Better HR
Yangon, Myanmar / Phnom Penh, Cambodia
Expanded into larger product ownership across Better HR and Better Jobs, covering integrations, scalable backend work, and recruitment-facing platform systems.
Yangon, Myanmar
A future milestone focused on growing into stronger technical leadership, broader product ownership, and end-to-end full-stack delivery across frontend and backend systems.
Engineering Notes
Structured notes from hands-on learning across DevOps, cloud, infrastructure, and software engineering topics that support my day-to-day development work.
Deeper study notes on software architecture, scalability, maintainable design, engineering tradeoffs, and production-ready development practices.
A practical day-by-day DevOps journey covering Linux administration, automation, networking, security, web stack setup, and production troubleshooting.
100 of 100 day notes are currently documented in this track.
A structured Azure learning track focused on cloud services, deployment workflows, identity, networking, storage, and real-world platform operations.
Education & Certifications
Formal study, professional certificates, and learning milestones that support my engineering foundation.
West Yangon Technological University
Jan 2014 - Dec 2021
Lincoln University College & ETVA
Mar 2023 - Oct 2023
NCC Education
Apr 2024 - Apr 2025
Let's Build Something Valuable
I'm currently open to backend developer and backend-leaning full-stack roles where I can contribute to product delivery, business-critical workflows, and reliable system design.
Looking for a developer who can own backend-heavy product work end to end.
The best fit is a team that values reliable APIs, strong business logic, system clarity, and someone who can translate operational needs into production-ready features.
Why Reach Out
Production backend work across internal platforms, business workflows, and customer-facing systems
Experience with business-rule-heavy systems, integrations, and workflow design
Comfortable collaborating across product, operations, and engineering teams
Preferred Contact
kaungsathein.5899@gmail.comInclude the role, team, or project context and I'll reply as soon as I can.
Open to backend developer roles, backend-leaning full-stack work, and product teams that care about reliable systems, clean business logic, and steady delivery.