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Backend Engineer

Projects

Nine projects across banking, digital signature, and SaaS. Client details stay at the level of public engineering practice.

  1. 01Signature HubCentralized digital signing platformBackend Software Engineer · Team of 4 · banks and enterprisesBuilt backend services for signing through HSM, remote-signing providers, and VNeID.Spring Cloud · Kafka · PostgreSQL · PKCS#11
  2. 02ACH GatewayNAPAS interbank payment gatewayBackend Software Engineer · Team of 12 · bankingImplemented inward-deposit processing on ISO 20022 pacs.008 with validation, business rules, status tracking, and process logging.Spring Boot · SQL Server · Redis · ISO 20022
  3. 03S-SpacePilates & fitness studio SaaSBackend Engineer · Team of 5 · live at s-space.co.krMaintained and debugged the production AWS environment: VPC with private subnets, ECS Fargate, Multi-AZ RDS, ALB, CloudFront, S3, and Secrets Manager.Java 17 · ECS Fargate · RDS MySQL · CloudFront
  4. 04BitBuildMulti-tenant construction procurement SaaSMain Backend Engineer · Team of 4 · first sprint to productionRestructured the codebase into a multi-module hexagonal architecture, with ArchUnit tests enforcing boundaries.Java 21 · PostgreSQL · Redis · GitLab CI
  5. 05MiribomBeauty booking with AI face simulationBackend Engineer · Team of 9 · live at miribom.krBuilt Kakao AlimTalk notifications end to end: template APIs and an outbox-based sender with SKIP LOCKED claiming, retry with back-off, and SMS fallback.Java 21 · Axon · PostgreSQL · GitLab CI
  6. 06PaperlessDigital signature moduleMain backend of the signing module · Team of 6Built internal signing, external signing by email, and third-party eSign integrations including VNeID.Spring Boot · PostgreSQL · PAdES
  7. 07Easy DocDocument automation for Standard CharteredBackend Software Engineer · Team of 5 · bankingBuilt backend APIs for digital forms and document automation on the Paperless platform.Spring Boot · Activiti BPMN · SQL Server
  8. 08JCanary CoreInternal Java and Spring frameworkBackend Software Engineer · Team of 5 · in-house platformContributed reusable modules: secrets management with HashiCorp Vault, multi-database data access, storage abstraction, and shared HSM signing utilities.Spring Boot · Vault · Flyway
  9. 09StrafficoProject and cost control for construction companiesBackend Engineer · Freelance · Java 21Built the GitHub Actions deployment for dev and prod: the JAR is built on the runner, then a blue-green switch releases it with zero downtime.Java 21 · MyBatis · Redis · GitHub Actions