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Kien Nguyen
Site Reliability Engineer · Photographer
Site Reliability Engineer

Kien Nguyen. SRE by day, photographer by night.

KubernetesGitOpsBlockchainObservabilityAI PlatformsPhotographyKubernetesGitOpsBlockchainObservabilityAI PlatformsPhotographyKubernetesGitOpsBlockchainObservabilityAI PlatformsPhotography
Paris--:--:--
Experience

From metro systemsto blockchain.

Eight years keeping safety-critical and financial infrastructure online, across four cities and two continents.

Ledger

Ledger

Senior Site Reliability Engineer · Ledger

2023 - Now

Paris, France · 48.86°N 2.35°E

Lead reliability for blockchain platforms while building Ledger's self-hosted AI platform for developer productivity.

  • Centralized MCP servers and model providers (AWS Bedrock, GitHub Copilot) behind LiteLLM as a single gateway.
  • Added a persistent memory layer with mem0 and Onyx: agents recall user preferences and past interactions, and query the company knowledge base for grounded, permission-aware answers over internal docs.
  • Cost and usage governance across teams through Langfuse and LiteLLM.
KubernetesvLLMLiteLLMLangfusemem0OnyxCoderNVIDIA A10GPostgreSQLPMMBlockchain

Paris · 48.86°N 2.35°E

Capability radar

8 / 8

Education

FR

ECE Paris, Engineering School

Engineering Degree

Specialization

Computer ScienceBig DataCybersecurity

Paris, France

AI Platform

A self-hostedAI platform.

Designed and deployed an end-to-end AI platform for developer productivity at Ledger: RAG-powered chat, a persistent memory layer, workflow automation, LLM observability, and on-demand dev environments powered by Coder.

1B+
Tokens processed
21K+
Requests / week
100%
Success rate
12+
Services
  1. Access
  2. Interface
  3. Tooling
  4. Automation
  5. Intelligence
  6. Memory
  7. Data

Component

LiteLLM

LLM gateway

LiteLLM gateway unifying access to every model behind one OpenAI-compatible API: prompt routing, load balancing, spend tracking and fallbacks across providers.

KubernetesArgoCDHelmMCPRAGmem0pgvector

Architecture & design

Designed the full platform: LLM routing, RAG pipeline, observability, and evaluated each component for enterprise readiness.

GitOps deployment

Shipped all 12+ services on Kubernetes via ArgoCD + Helm, Terraform IaC, zero-downtime progressive rollouts.

Observability & ops

Built the observability layer: Langfuse for LLM tracing, Datadog for infra, and custom dashboards.

Photography

The other half:
chasing light.

View all albums
The wall

Say hi, by hand.

A little drawn note from whoever passes by.

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Contact

Let's build somethingreliable, or chasethe next light.

Whether it's infrastructure, AI platforms or a remote summit at golden hour. The best way to reach me is a LinkedIn DM.

Off the clock

Photography

Sony A7IV

Piano

9 years

Cycling

Road & gravel

Tennis

Competitor

Got a quick question?

The assistant in the bottom-right corner knows my work, stack and projects. Ask it anything.

KNSite Reliability Engineer
© 2026 Kien NguyenNext.js · Tailwind · Kubernetes