# KyoungSig Kim

> Software Engineer at Altigen

Location: Pleasanton, California, United States
Profile: https://flows.cv/kyoungsig

I am excited to apply for the Full-Stack Software Engineer (Backend-Focused) position. With more than 20 years of experience building scalable software across cloud, VoIP, and real-time communication systems, I bring deep backend engineering expertise along with strong full-stack capabilities.

I specialize in cloud-native applications on Azure Kubernetes Service (AKS), developing RESTful APIs and distributed backend services, and implementing SIP/VoIP proxy systems. My experience spans the full software lifecycle, from backend infrastructure to front-end products, enabling me to deliver secure, reliable, and multi-tenant solutions.

My technical skill set includes:
- Languages: C#, C/C++, Go, Python, Kotlin, Java, JavaScript, TypeScript, SQL
- Frameworks & Libraries: .NET, Node.js, React, Angular
- Cloud & DevOps: Azure Kubernetes Service (AKS), Terraform, Helm, Docker, CI/CD, YAML
- Telecom/VoIP: SIP, RTP, CTI, PBX systems, VoIP protocols
- Databases: MySQL, Postgres, SQL Server
- Operating Systems: Windows, Linux (Debian)

Throughout my career, I have architected cloud-based microservices, improved system reliability and performance, automated infrastructure, and developed full-stack applications across web, mobile, and desktop environments. I am comfortable owning complex systems end-to-end and collaborating in fast-paced engineering teams.

## Work Experience
### Software Engineer @ Altigen
Jan 2015 – Present | United States
•	Cloud Infrastructure & Deployment
•	Designed and deployed Anconnect server systems on Azure Kubernetes Service (AKS) for in-house and Fiserv environments, developed using Python and Go.
•	Automated provisioning and deployment using Terraform, Helm, and YAML, ensuring scalable and reliable infrastructure.
•	VoIP & API Development 
•	Developed SIP CallInfo Proxy (C# REST API) to intercept, modify, and forward SIP messages.
•	Developed PBXInfo Proxy integrating AS7 and CoreViewUC for communication, session/role control, and data exchange.
•	Unified Communications Platforms
•	Developed CoreViewUC App (React, JavaScript) supporting voice, chat, and SMS, integrating with AS7 for SIP signaling and call control. 
•	Built CoreViewUC for Android (Kotlin), extending UC capabilities to mobile. 
•	Created modular, reusable React components for scalable and maintainable frontends.
•	Service Hub & Team Portal
•	Developed centralized Service Hub (C#, JavaScript/jQuery, SSO) integrating MaxACD Admin, Max Communicator, MaxReport, and UMS.
•	Implemented Team Portal with real-time call tracking and automated billing workflows, including usage logging and account management.
•	Max Communicator 
•	Developed a unified voice + chat client (C# backend, ReactJS frontend) leveraging Mattermost for collaboration.


## Education
### Bachelor's degree in Communication and Media Studies
Inha University 인하대학교


## Contact & Social
- LinkedIn: https://linkedin.com/in/kyoungsig-kim-551374227

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Source: https://flows.cv/kyoungsig
JSON Resume: https://flows.cv/kyoungsig/resume.json
Last updated: 2026-04-10