songjaehyun

Work

Product engineering from first architecture to production operations.

I build software across backend systems, product interfaces, cloud delivery, and the operational details that decide whether a launch actually holds up. The work below spans my independent practice, client delivery, product development, and enterprise platforms.

01 · Independent software practice

DontSweat.Tech

A software engineering practice for businesses that need to design, build, stabilize, and ship clear working systems.

Visit DontSweat.Tech

I use DontSweat.Tech as the home for hands-on client work across product development, architecture, cloud infrastructure, integrations, performance, and technical leadership.

  • Turn ambiguous business needs into practical delivery plans
  • Build across frontend, backend, data, and deployment boundaries
  • Leave clients with clearer systems, ownership, and operating paths
Product engineeringSystem architectureAWSTechnical leadership

02 · Client ecommerce launch

Vye Coconut Water

A modern ecommerce presence for Vye Brands Inc., delivered with the launch infrastructure around it.

Visit drinkvye.com

The project connected a polished customer experience with Stripe checkout, transactional email, store-location maps, domain migration, DNS cleanup, and email deliverability. I treated those pieces as one coordinated release instead of separate handoffs.

  • Customer-ready storefront and Stripe-backed checkout
  • Resend-powered email and Leaflet store-location experiences
  • A coordinated domain, DNS, and mail migration
Next.jsTypeScriptStripeResendLeafletVercel

03 · Workforce coordination SaaS

Farero

A multi-organization workforce platform for schedules, timekeeping, reporting, and day-to-day team coordination.

View Farero on GitHub

Farero brings calendar workflows, client and team management, role-aware timesheets, PDF reporting, notifications, and structured quick intake into one operational product. The backend emphasizes tenant boundaries, explicit review flows, and production-minded rollout controls.

  • Multi-team identity and role-aware access boundaries
  • Timesheet, scheduling, reporting, and client-site workflows
  • Encrypted intake drafts with review-before-commit behavior
Next.jsTypeScriptPostgreSQLPrismaAuth.jsResend

04 · Wholesale ordering platform

Jumun

A wholesale commerce system with separate retailer, operations, and API applications inside one coordinated product architecture.

I structured Jumun as independently deployable storefront and admin frontends backed by a Spring Boot modular monolith. Shared design primitives and an OpenAPI-generated client keep the product coherent without coupling every release.

  • Separate retailer and administrative experiences
  • Domain-oriented Spring Boot API with PostgreSQL and Flyway
  • Independent AWS delivery paths for frontend and backend workloads
Next.jsSpring BootJavaPostgreSQLS3CloudFrontECS

05 · Migrations, AEM, and reliability

Enterprise platform delivery

Large-scale platform work shaped around content operations, governance, accessibility, security, and release constraints.

My enterprise work includes moving on-premise platforms toward cloud-native delivery, refactoring more than 40 backend services, building AEM components, and designing cache behavior across Apache, Dispatcher, and CDN layers while keeping releases available and supportable.

  • AEM migrations and reusable component implementation
  • Cloud delivery and zero-downtime release planning
  • WCAG-aware frontend work, security hardening, and production support
JavaAEMaaCSSpring BootDispatcherApacheReactCI/CD

How I work

Clarify

Map the real workflow, constraints, dependencies, and definition of done.

Build

Stay hands-on across contracts, interfaces, data, infrastructure, and delivery.

Stabilize

Make ownership, observability, rollout choices, and future changes easier to reason about.

Connect

If you'd like to see more of my work or connect professionally, you can find me through the following channels.