Gideok Seong (Kevin) | Software Engineer | Full-Stack Developer | Backend Engineer | DevOps Engineer

Software Engineer building and operating production SaaS products, multi-tenant platforms, and enterprise systems.

Hands-on experience across ASP.NET Core, SQL Server, Next.js, Docker, Linux, API integrations, observability, CI/CD, and production operations.

View Projects View Experience Contact Me

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

New Jersey, United States

Engineering Focus

Product engineering with practical ownership across API integrations, deployment, billing, and operational support.

Technical Summary

Product-focused engineer with practical experience in ERP/data workflows, enterprise operations, and end-to-end SaaS platform development.

SellerVisor Product Engineering

Built and operate a multi-tenant SaaS platform with full-stack features, billing, automation, AI workflows, and production ownership.

Business Systems & Data Collaboration

Supported ERP migration, cross-functional requirement gathering, workflow documentation, and SQL reporting for decision support.

Operations, Monitoring & GenAI Discovery

Supported WebLogic operations, Prometheus/Grafana/Alertmanager observability, Dockerized Elasticsearch/Kibana logging, and GenAI solution planning.

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 ownership across full-stack product delivery, backend architecture, database optimization, API integrations, and Linux-based production operations.

Architected 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, REST APIs, and Hangfire for synchronization and large-scale automation processing.
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-APIOpenAIGeminiDataForSEO

Projects ->

Experience

SellerVisor

Co-Founder / Lead Product Engineer

July 2025 - Present | New Jersey, United States

Built and operate a multi-tenant SaaS platform for Amazon sellers with analytics, automation, billing, reporting, and AI-powered workflows.

Built backend services with ASP.NET Core, Entity Framework Core, SQL Server, REST APIs, and Hangfire for large-scale synchronization and automation workloads.
Developed 50+ production features using Next.js, TypeScript, JavaScript, and Razor Pages across dashboards, reporting, and operational workflows.
Designed and optimized SQL Server schema, indexing, and reporting queries to improve performance and scalability.
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.
Implemented automation engines for campaign optimization, keyword analysis, bid management, and reporting to reduce manual operational effort.
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 production environments across multiple servers, services, and business-critical applications.

Built and maintained centralized monitoring and alerting using Prometheus, Grafana, Alertmanager, and Spring Boot Admin to improve visibility and incident detection.
Supported Dockerized Elasticsearch and Kibana logging workflows for troubleshooting and operational analysis.
Participated in incident response, troubleshooting, and root-cause analysis to help maintain operational stability.
Contributed to GenAI initiatives by translating business requirements into technical discussions, document-processing use cases, and solution/cost 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.
Built SQL reporting 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 ->