VAVIGNESH ATHIAPPAN
Engineering Lead · Enterprise Systems Architect · AI & Integration Platforms

Vignesh Athiappan

7.5+ years building the systems 5,000+ employees run on: a multi-agent AI assistant on Microsoft Teams, a real-time integration backbone across 15+ systems, and an enterprise data lake on Fabric — leading ~25 engineers, shipping production systems in 3–60 day timelines.

Namakkal, Tamil Nadu, India  ·  +91 94863 04676  ·  [Open to — set your availability line]

5,000+
Employees served
15+
Systems, one backbone
50+
Production workflows
~25
Engineers led
200+
Data-lake tables
3–60d
Ship timelines
Systems index

Everything I've architected, in one screen

// tap any row for role & impact
AI · Agents Nexi — multi-agent AI assistant on Microsoft Teams 5,000+ users · demoed to CEO/COO

RoleArchitect & lead. Teams bot in C# / .NET 8 / Bot Framework SDK on Azure App Service; central Logic App router dispatching to 4 production specialist agents (Resource Info, Leave, ADO Sync, Knowledge Base) integrating Pulse, NetSuite, CRM and more. End-to-end observability in Application Insights; 14+ prompt iterations.

Under the hoodThe Knowledge Base agent is production RAG on Azure AI Search — 15+ country- and domain-specific policy indexes fronted by a query classification + rewriting layer that resolves follow-up questions into self-contained searches. Multilingual via Azure AI Translator.

Next generationArchitected 3 next-gen agent systems — L&D Agent, PRM Agent (10 sub-agents), Opportunity Agent (7 sub-agents) — and established reusable patterns: promise-ledger, action registry, domain-driven sub-agent decomposition.

Integration Nexus — enterprise digital backbone across 15+ systems 50+ workflows · 200+ job reqs/mo

RoleSole architect. Real-time integration layer connecting 15+ internal and SaaS systems across HR, Sales, Finance and Resource Management — 50+ Logic App workflows behind API Management, including Greenhouse ATS at 200+ job requisitions/month. Eliminated operational silos organization-wide.

The hard 20%OAuth token-invalidation race conditions, WAF false positives on legitimate traffic, schema-validation overflows, private ILB triggers with APIM as the sole front door, fixed egress via NAT gateway for partner whitelisting.

Data platform Fabric Data Lake + AI Data Agent — Bronze→Silver→Gold 200+ tables · demoed to CEO

RoleArchitect & team lead (4 data engineers + 3 Power BI analysts); migrated 2 source systems personally. Medallion architecture, 10+ curated Gold datasets.

The interesting partA dynamic GraphQL API as an MCP layer — the AI model reads the schema, constructs its own queries, and answers conversationally. Democratized data access for Operations, FP&A, HR, Sales and the C-suite; HR Data Agent demoed to the CEO.

Knowledge graph CRM Knowledge Graph — schema-as-graph for grounded AI demoed to leadership

WhatA knowledge graph built entirely from the code layer — table relationships, per-column definitions, and join paths — designed to power natural-language query answering and automated report generation. The ontology layer between the warehouse and the agents, so schema context stops being hand-fed into every prompt.

Security Azure landing zone & security architecture APIM as the single front door

ScopeDriving the security architecture across the estate: least-privilege integration identities (after auditing an over-broad access grant), bulk secret centralization into Key Vault with managed identities, private ILB workflow triggers with API Management as the only public surface, Front Door / WAF rule tuning, and secret-rotation discipline.

NowBuilding a per-application security assessment framework — methodology and dimensions first, piloted application-by-application before any tooling.

Reporting Lake Reports — reporting hub on Fabric Gold 20+ reports · 6 categories

RoleArchitected the full greenfield solution (Angular + .NET + Fabric Gold) and directed the team: catalog UI, dynamic filters, favorites, multi-format export (Excel, CSV, PDF, JSON). Single reporting hub replacing fragmented reporting for FP&A, HR, Operations, Sales and executive leadership.

AI · Revenue Sales Summary — AI-driven revenue intelligence shipped in 3 weeks · ~15 key accounts

RoleDesigned a two-tier parallel architecture ingesting Teams, Email and CRM data into Fabric Gold for Copilot insights. The COO uses it for deal tracking across ~15 key accounts.

HR platform Performance Management System — configurable workflow engine live in 60 days · org-wide

RoleIndependently designed the complete schema and configurable workflow engine; led the full lifecycle to production. Live within 60 days, now used organization-wide across all geographies.

HR platform Skills Intelligence Platform — competency framework & reporting end-to-end in 45 days

RoleSolo architect — schema, workflow, competency framework, reporting. Enterprise-wide skill visibility, delivered end-to-end in 45 days.

Operations OPM — resource allocation & compliance EU rollout · 2,000+ employees

RoleDesigned allocation workflows with 38 test scenarios and 7 compliance checks. Led the EU rollout in Serbia — 2 months, 2,000+ employees, 20+ project managers — unifying global operations under one framework.

Governance Approval Hub + SSRS migration — Azure readiness ~90 reports replaced

RoleConsolidated approval workflows into a single auditable platform, and replaced ~90 on-prem SSRS reports with SheetJS Excel builders — removing the critical blocker for the Azure cloud migration.

Reliability Performance engineering — load testing & capacity planning P95 < 1s under load

RoleJMeter load testing across core platform screens and integration paths (P95 backend 0.72s), read/write contention analysis, and the capacity plan — tier upgrade, load balancing, autoscaling — with monthly cost forecasting to leadership.

Recognition & beyond the day job

Proof it landed — and what I do off the clock

Recognition & leadership
  • 2024 Pinnacle Team Award · 2025 Pinnacle Nominee (Dream Team) · SPOT Award — Execution & Innovation · Bronze Badge — Learning Credits
  • Demoed AI systems directly to the CEO and COO — demo-first delivery strategy to secure executive buy-in before scaling
  • Built 3 new org capabilities from zero: the Fabric Data Lake team, the Automation Testing practice, and AI Agent engineering
  • Trained 3 fresher batches into production-ready engineers; led ~25 engineers across platform, AI, integration, data and QA
  • Led the EU rollout in Serbia — 2,000+ employees onboarded onto one operating framework in 2 months
  • Embedded AI-first engineering practices — prompt engineering as a daily force multiplier for architecture, code, debugging and docs
In public / currently sharpening
  • github.com/av-vignesh — incl. Orbit: a single-file Microsoft 365 workspace (MSAL + Graph — calendar, mail, meeting transcripts) with AI summarization, live on GitHub Pages
  • Microsoft AI Innovation Day — attended; wrote a full field-notes debrief on Fabric IQ/ontology, agent architectures and frontier tuning — read it
  • Start here: the Logic Apps hosting decision · the Orbit build story · a knowledge graph for a warehouse with no foreign keys
  • dev.to/vicky_acedia — 26 articles in the first month: Azure integration at scale, agentic AI, design patterns, platform war stories
  • Currently deep in: model fine-tuning (SFT / LoRA) on Azure — working the ladder from baseline evals toward trained adapters
  • Off the clock: Namakkal, Tamil Nadu — a garden that gets more attention than it admits, and travel whenever the release calendar allows
Capabilities

The full toolbox

// deep on Azure — the patterns travel to any cloud
AI / LLM
Azure OpenAI (GPT-5-chat · GPT-4o · GPT-4.1)Azure AI Foundry AgentsMulti-agent orchestrationAzure AI SearchRAGPrompt engineeringAgent tool callingDynamic GraphQL MCPQuery rewritingAzure AI Translator
Cloud
App ServicesBot ServiceFunctionsLogic AppsService BusAPI ManagementKey VaultFront Door / WAFManaged IdentityCI/CD
Backend
.NET 8C#Bot Framework SDKWeb APIRESTSignalRGraphQL
Frontend
AngularTypeScriptPrimeNG
Data
Microsoft Fabric (Pipelines · Notebooks · Mirroring · Copy Jobs)SQL ServerMongoDBPower BIKQL
Bot / Teams
Adaptive CardsCloudAdapterTeams Admin Center deploymentMicrosoft GraphMSAL
Tools
ClaudeGitHub CopilotChatGPTM365 CopilotApplication InsightsDockerPostmanJMeter
Track

Where the scope came from

Sep 2021 — Present

Orion Innovation

Technical Lead — operating at enterprise-architect scope

Own architecture and delivery for enterprise platforms serving 5,000+ employees. Scope grew from a single platform to the full internal estate — applications, the integration backbone, the data lake, and the AI agent ecosystem — plus leadership of ~25 engineers. The title stayed the same. The blast radius didn't.

Apr 2019 — Sep 2021

Accenture

Software Developer — AQA Education (UK examination & certification body)

Enterprise web services and RESTful APIs for examination management and certification workflows — full lifecycle from requirements through integration testing to production deployment.

2015 — 2019

Sri Krishna College of Engineering and Technology

B.E. — Electrical & Electronics Engineering

An EEE graduate who ended up architecting AI platforms — the circuit-analysis instinct never left.

Contact

Hiring for platform, AI, or integration architecture?

I'm looking for a role where the title matches the scope. A short call is the fastest way to know — reach out.

Namakkal, Tamil Nadu, India [Notice period / availability] References on request