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new file mode 100644
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diff --git a/davo-cv/portfolio/img/danusys-sys-arch/server-minimalistic.svg b/davo-cv/portfolio/img/danusys-sys-arch/server-minimalistic.svg
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+<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" aria-labelledby="walkingIconTitle" stroke="#000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" color="#000000"> <title id="walkingIconTitle">Walking</title> <circle cx="13" cy="5" r="1"/> <path d="M15 20L14 17L11 14M11 14L12 9M11 14L8 20M12 9L15 12L17 13M12 9L9 11L8 14"/> </svg>
+\ No newline at end of file
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diff --git a/davo-cv/portfolio/index.md b/davo-cv/portfolio/index.md
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+# Davo's Portfolio
+*This is part of [Davo's resume](https://cdn.snart.me/hireme/). This is a living
+document. Revision: 0*
+
+Dear human readers,
+
+In this era of ATS and AI, I cannot thank you enough for taking your valuable
+time to have a look at my portfolio. Here, I present you my best efforts to
+showcase my work experience in simple terms for both non-technical and technical
+audience. I hope you enjoy.
+
+(c) 2025 David Timber
+
+## Keywords
+C/C++ dev, sysadmin, network engineering
+
+Linux, OpenWrt, Qt, MSVC++, MFC, WinAPI, ffmpeg, OpenCV, OpenGL, DirectX, WebGL
+
+Embedded development, kernel development, React, ReactNative, Unity
+
+WebRTC, real-time streaming/processing, web development, frontend, backend
+
+AWS, GCP, Azure, Orchestration, Ansible, Docker, CD/CI(Github, Gitlab), libvirt
+
+## Language Skills
+| Expert | Good/average | Good/average but rather not use it |
+| - | - | - |
+| C, Python, Shell | C++, PHP, Basic, CSS, SQL | Javascript, Java |
+
+## Danusys
+In Korea, video surveillance is a multi-million dollar industry. Danusys has had
+a fair share of the market since 2007 a contractor for multiple municipal
+government across South Korea.
+
+<img src="img/camsite-wa-0.webp" alt="wa" width="500">
+<img src="img/camsite-sv-0.webp" alt="stockholm" width="500">
+<a href="https://www.boannews.com/media/view.asp?idx=83159">
+<img src="img/camsite-kr-1.webp" alt="boannews.com" width="500">
+</a>
+<a href="https://www.dailycc.net/news/articleView.html?idxno=245890">
+<img src="img/camsite-kr-0.webp" alt="dailycc.net" width="500">
+</a>
+
+### System architecture
+https://www.datapanik.org/wp-content/uploads/CCTV-Cameras-by-City-and-Country.pdf
+
+<a href="https://www.arcgis.com/index.html">
+<img src="img/gis.webp" alt="GIS showing camera locations(screenshot)" width="650">
+</a>
+
+A usual metropolitan city council operates 10k+ fixed camera sites. Over the
+dark fibre network, the video streams are relayed to the city council data
+centre, where the video streams are stored and monitored by the operators.
+
+A massive amount of data has to be transferred, processed, stored in real-time.
+Numerous contractors are involved to build the infrastructure required. Multiple
+technologies, including ones home-brewed by Danusys, are employed to overcome
+many engineering challenge to build such systems.
+
+<img
+	src="img/danusys-sys-arch.webp"
+	alt="Simplified architecture diagram"
+	width="850">
+
+Simplified diagram of Danusys VMS architecture
+
+*(This is a typical architecture of any VMS solution. The actual product names
+are replaced with generic tech industry jargons to avoid breach of NDA.)*
+
+#### Edge Node
+The video streams from multiple cameras are gathered on the edge node. A
+specialty hardware is used where the cameras are traditional analogue cameras to
+transcode the footage to modern encodings like H264 and HEVC. The video streams
+are encapsulated in one unified internal protocol for ease of processing,
+transport, and storage. The edge node is responsible for (but not limited to):
+
+- Relaying streams to the data centre
+- Processing footage and decision making in real-time
+  - Track moving objects using [PTZ camera](https://en.wikipedia.org/wiki/Pan%E2%80%93tilt%E2%80%93zoom_camera)
+  - Alerting the command centre and sounding alarms in case of events
+  - Facial recognition and [ANPR](https://en.wikipedia.org/wiki/Automatic_number-plate_recognition) (where required)
+- Storing video
+
+Due to RTT(round-trip time), "edge computing"(a technique that's been
+popularised recently) is employed. The edge nodes are often equipped with
+sufficient computing power to processing video in real-time. The edge nodes
+operate autonomously(without the need to communicate to the data centre) to
+issue commands to the PTZ cameras and other peripheral devices. The edge nodes
+are also capable of storing video on site so that no data is lost during link
+failure.
+
+#### Stream Relay Agent
+The data link between the camera sites and the local government's data centre is
+often limited and unstable. To prevent network overload, real-time streams are
+relayed to the data centre where they're duplicated for other purposes such as
+storage, further analysis, and manual monitoring by human operators.
+
+The Stream Relay Agent also features conversion from and to standard streaming
+format(RTP/RTSP) and vendor-specific proprietary streaming protocols.
+
+#### Stream Store Agent
+To implement the [3-2-1 rule](https://www.seagate.com/gb/en/blog/what-is-a-3-2-1-backup-strategy/),
+a backend program that stores data relayed from the stream relay agent runs on
+the servers at the data centre. The servers are backed by enterprise data
+storage(SAN, directly attached SCSI HDDs). The agents are responsible for
+storing data for the duration required by local legislation(30 days in Korea)
+and deletion of data.
+
+The operators can use the front apps to access data stored on the store agents
+to search and view stored videos and events.
+
+#### Master Control Plane Server
+The master control plane server is a program that supervises overall operation.
+The operation includes:
+
+- Access control: user authentication and authorization
+- Distribution of centralised configurations to all backend and frontend nodes
+- Enforcing site-specific policies
+- Other stateful functionality: scheduled tasks, pre-programmed logic and
+  behaviour set by site operators
+
+As the server is a crucial component of the system, the server is hosted on
+hardware with additional redundancies. The server also features active-backup
+failover.
+
+#### Front GUI Apps
+<img src="img/Luxriot-Monitor-Playback-1.webp" alt="Typical VMS front app" width="650">
+
+Multiple front-end apps are developed for client's use cases. The apps can be
+categorised in these feature groups:
+
+- Control Plane Manager: talks directly to the master control plane server, used
+  to configure site-wide settings
+- Operator Software: used by command center operators and other external
+  stakeholders, including police dept., defense agents, city maintenance
+  contractors
+  - Viewer for live and stored stream
+  - Search engine for stored data
+- Diagnostics tools for experts and devs
+
+### My Involvement
+Building such a complex software architecture requires a team effort. The
+following highlights my involvement and achievement during my time with Danusys.
+
+#### Edge Node
+- General maintenance
+- Complete rewrite of the existing vision algorithm (detailed in later section)
+- Other performance improvements in video decoding, memory management
+
+#### Server Products
+- Porting existing Windows server products to Linux
+- Linux tech support
+- Embedded Linux dev
+
+#### Codec Research
+(detailed in later section)
+
+#### Network and Systems Administration
+- HQ office net admin, sysadmin
+- Site net admin support
+
+---
+
+### Computer Vision R&D
+<!-- TODO: hide in printed form -->
+<img
+	src="img/danusys-prism-animated.webp"
+	alt=""
+	width="600"
+	class="no-print">
+
+- **Project duration**: 1.5 years
+- **Written in**: C++
+- **Platforms**: Windows, Unix-like
+
+The following diagram illustrates the pipeline of the computer vision algorithm
+module for object detection and tracking I myself, under the supervision senior
+devs, developed from scratch.
+
+<img
+	src="img/danusys-prism_pipeline-0.webp"
+	alt=""
+	width="850">
+
+Live video streams are decoded on the edge node and fed to the pipeline for
+analysis. The estimated background image constantly gets updated by input
+frames. The generated background image is then diff'd against the latest frame
+to extract foreground objects. The object association model then takes the
+extracted foreground object as input to associate them with the objects appeared
+in the previous frames to make the best model of the object's characteristics
+including travel path, direction, speed, and type of object.
+
+The information is then consumed by other modules to perform various tasks,
+including, but not limited to:
+
+- PTZ tracking
+- Preset events e.g. intrusion, loitering
+- AI models, facial/plate recognition
+
+<img
+	src="img/danusys-prism_pipeline-1.webp"
+	alt=""
+	width="850">
+
+<!-- https://www.nytimes.com/2018/08/13/lens/surveillance-camera-photography.html -->
+
+The module is an amalgamation of several algorithms from various papers
+optimised for real-time performance and memory footprint. The module is still in
+use county-wide.
+
+### Media Codec Research
+<img
+	src="img/codec-research.webp"
+	alt=""
+	width="850">
+
+- **Project duration**: 6 months
+- **Written in**: C++
+- **Platforms**: Windows, Linux
+
+Media codecs are one of the critical components of the VMS solutions. New
+encoding standards are release every decade whilst numerous old cameras are
+stuck with legacy video encoding. Some camera vendors insist on supporting their
+own proprietary video encoding only to circumvent patent and
+[licence fee](https://en.wikipedia.org/wiki/MPEG_LA) issues.
+
+It's not unusual for a VMS solutions to support more than 20+ different video
+and audio encodings. This calls for a good codec abstraction layers to keep the
+software maintainability at bay.
+
+I was tasked to bring the codec abstraction and APIs up to the modern standard.
+
+#### Hardware accelerated codec
+<img
+	src="img/codec-traditional.webp"
+	alt=""
+	width="850">
+
+Another engineering challenge for the front apps is the large number of
+real-time video streams to decode simultaneously. Mid 2010 was when Intel, AMD
+and Nvidia started to embed ASIC video codec in the silicon die. Historically,
+the VMS apps had to rely soley on software-based decoding. Modern CPUs and GPUs
+are now capable of decoding 2-3 1080p streams at the same time. By utilising all
+of the hardware codecs in the CPU and GPU on a regular PC, some of the load
+required for video decoding can be offloaded to ASIC decoders. To put things in
+perspective, in a 4x4 viewing configuration, 5-6 out of 16 streams could be
+offloaded.
+
+Software-based codecs suffer from memory bandwidth starvation since fully
+decoded frames need to be transferred back and forth before they can be
+displayed:
+
+1. Decoding: encoded 264/HEVC data from memory to full YUV picture to memory
+1. Scaling: full YUV picture from memory to scaled down/up RGB picture to memory
+1. Rendering: RGB picture from memory to VRAM framebuffer
+
+Some optimisations can help skip the step 2, but there still remains the problem
+of having to transfer full 1080p frames 30 times per second through the PCIe
+bus. ASIC codecs provide what's called "zero-copy" solution, in which encoded
+frames are copied to the VRAM where they are decoded directly to the frame
+buffer.
+
+#### SoC codec
+<img
+	src="img/codec-research/imx.webp"
+	alt=""
+	width="250">
+
+There was a brief period when the company endeavoured the venture into the
+consumer NVR market in effort of diversifying the B2G portfolio. This meant the
+development of a low-cost SoC based NVR.
+
+Many video surveillance companies are faced with the same problem and constantly
+try to break free from government funding by venturing into the consumer market.
+The major issue is the scale of the domestic market and the fact that the global
+market is dominated by cheap Chinese and Taiwanese brands.
+
+Although the product never saw the light of day, my expertise was required for
+the development of the product. I added SoC codec support and ported all the
+backend daemons and frontend apps.
+
+## Hobbyist years
+### Failed video game project
+2018
+
+https://youtu.be/PaBgZEkTaFw?si=rI-nD-GpPrW28bEL
+
+### "Proone" Research Linux Worm Virus
+2019 - 2022
+
+https://github.com/dxdxdt/proone
+
+### Book: "Dev Log"
+Deep dive into network engineering(work in progress).
+
+## Open source project contributions
+| project | what | url |
+|-|-|-|
+| http-server | -H/--header option in line with curl(1) | https://github.com/http-party/http-server/pull/887 |
+| NetworkManager | Bug fix: default route pushed RIO(Router Information Option, RFC 4191) in IPv6 RA not honoured | https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1666 |
+| TP-Link C20-v5 OpenWrt port | OpenWrt port for TP-Link Archer C20 v5, a cheap router found in Australian consumer retail | https://github.com/dxdxdt/tp-link_c20-v5.dev |