Gideok Seong (Kevin) | Full Stack Software Engineer

Full Stack Software Engineer building production SaaS applications and enterprise software.

Experienced with C#, ASP.NET Core, .NET, Entity Framework Core, SQL Server, React, Next.js, Docker, Linux, AWS, RESTful APIs, background processing, SQL optimization, CI/CD, observability, and production support.

View Projects View Experience Contact Me

C#ASP.NET CoreNext.jsTypeScriptSQL ServerLinuxDockerAWSCI/CDPrometheusGrafanaAmazon SP-APIAmazon Ads APIStripeOpenAI API

New Jersey, United States

Engineering Focus

Backend services, RESTful APIs, asynchronous workflows, SQL performance, full-stack product features, cloud deployment, and operational reliability.

Technical Summary

Full-stack engineer with practical SDLC experience from design and implementation through deployment, monitoring, and maintenance.

Production SaaS Engineering

Designed and developed a multi-tenant SaaS platform supporting analytics, automation, billing, reporting, and AI-powered workflows.

Backend, APIs & Data

Built backend services with ASP.NET Core, EF Core, SQL Server, RESTful APIs, Hangfire, retry policies, pagination, rate limiting, and SQL optimization.

Operations & Observability

Support production environments with Docker, Linux, AWS, CI/CD, Prometheus, Grafana, Alertmanager, Elasticsearch, Kibana, and incident response.

Featured Project

Multi-tenant SaaS platform for Amazon sellers focused on analytics, automation, billing, reporting, and AI-assisted workflows.

SellerVisor

SellerVisor highlights practical software engineering across full-stack product delivery, backend services, database optimization, API integrations, asynchronous processing, and Linux-based production operations.

Designed and developed a multi-tenant SaaS platform supporting analytics, automation, billing, reporting, and AI-powered workflows.
Built backend services with ASP.NET Core, EF Core, SQL Server, RESTful APIs, and Hangfire for synchronization and automation workflows processing thousands of records per execution.
Implemented resilient background processing with retry policies, exponential backoff, pagination, rate limiting, and fault-tolerant workflows.
Developed 50+ production features across Next.js, TypeScript, JavaScript, and Razor Pages for dashboards, reporting, and operational workflows.
Integrated 7+ external APIs including Amazon SP-API, Amazon Ads API, Stripe, OpenAI, Gemini, Jungle Scout, and DataForSEO with resilient retry/rate-limit handling.
Deployed and maintained Docker-based Linux production environments with continuous troubleshooting and iteration.

C#ASP.NET CoreEntity Framework CoreRazor PagesNext.jsTypeScriptSQL ServerHangfireLinuxDockerStripeAmazon Ads APIAmazon SP-APIOpenAIGeminiJungle ScoutDataForSEO

Projects ->

Professional Experience

SellerVisor

Full Stack Software Engineer

July 2025 - Present | New Jersey, United States

Designed and developed a multi-tenant SaaS platform supporting analytics, automation, billing, reporting, and AI-powered workflows.

Designed and developed scalable backend services with ASP.NET Core, Entity Framework Core, SQL Server, RESTful APIs, and Hangfire for synchronization and automation workflows processing thousands of records per execution.
Implemented asynchronous background processing with Hangfire, retry policies, exponential backoff, pagination, rate limiting, and fault-tolerant workflows.
Developed 50+ production features using Next.js, TypeScript, JavaScript, and Razor Pages across dashboards, reporting, and operational workflows.
Designed SQL Server schemas, indexing strategies, stored procedures, and optimized complex reporting queries.
Integrated external APIs including Amazon SP-API, Amazon Ads API, Stripe, OpenAI, Gemini, Jungle Scout, and DataForSEO with retry logic, pagination, rate-limit handling, and fault-tolerant processing.
Built customer-facing dashboards, reporting systems, operational workflows, billing flows, and AI-assisted automation features.
Deployed and maintained Docker-based Linux production environments to improve deployment consistency, reliability, and operational efficiency.

ASP.NET CoreSQL ServerNext.jsHangfireAmazon APIsStripeDockerLinux

Samsung SDSA via Snelling

Application Operations & Monitoring Engineer

February 2024 - Present | New Jersey, United States

Support enterprise applications across large-scale production environments, multiple servers, and business-critical applications.

Developed internal automation scripts and operational tools to improve monitoring and incident response efficiency.
Built and maintained centralized monitoring, alerting, and observability solutions using Prometheus, Grafana, Alertmanager, Elasticsearch, Kibana, Docker, Linux, and Spring Boot Admin.
Supported Dockerized Elasticsearch and Kibana logging workflows for troubleshooting and operational analysis.
Participate in incident response, root-cause analysis, production troubleshooting, and cross-team communication to maintain operational stability.
Contribute to GenAI initiatives by translating business requirements into technical discussions and solution planning.

WebLogicPrometheusGrafanaAlertmanagerElasticsearchKibanaDockerGenAI Discovery

Beauty Plus

ERP Migration & Data Systems Analyst

April 2020 - January 2024 | New Jersey, United States

Supported ERP migration from a legacy C# system to a web-based platform through workflow documentation, data validation, and SQL-driven reporting.

Coordinated cross-functional migration requirements and translated business workflows into implementation-ready technical specifications.
Developed SQL reporting solutions, analytical queries, and operational dashboards used for management decision-making.
Improved reporting performance through SQL query tuning and indexing strategies.
Created migration validation procedures, database handoff materials, and documentation to support deployment readiness.

ERP MigrationSQL ReportingRequirements GatheringWorkflow DocumentationData Validation

Professional Experience ->