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VARUNDEF

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DAILY SYSTEMS // ONE PERSON

Purchasing, inventory, and booking. Systems your staff use every day.

I own them through production. After go-live I stay with the system for fixes and the next module. I am the person to contact when the warehouse or the books are stuck. Each week there is a working slice, reviewed with the people who will use it.

Angular, .NET, Next.js.

SYSTEM STATUS

> SYSTEMS: PURCHASING | INVENTORY | BOOKING

> OWNED: THROUGH PRODUCTION

> STACK: ANGULAR | .NET | NEXT

> AFTER: FIXES | NEXT MODULE

> _

Developer snapshot

I deliver the work and stay with the system once it is running. For 6+ years I have taken daily company systems — purchasing, inventory, booking, and the rest of the work staff repeat — through to production. I work directly with the person who runs the business, then stay for fixes and the next module.

What I build

Most of my time goes to the systems staff open every day. Write if the work crosses more than one of these.

Web & product UI

Angular, React, Next.js

AngularNext.jsReact

Screens and flows staff use every day — purchasing, inventory, and booking — in Angular, React, and Next.js, taken through to production.

Backend & data

.NET, NestJS, SQL & NoSQL

.NETNestJSMySQL

ASP.NET Core, NestJS, and Node — the APIs, MySQL and MongoDB, and background jobs behind those screens, including fixes when production load hits the database.

Shipping & keeping it up

AWS, Docker, CI/CD

AWSDockerCI/CD

AWS, Docker, and GitHub Actions, and keeping a system stable after launch. Retrieval, transcription, and embeddings only when a workflow needs them.

Experiences

Roles and engagements

Freelance / Contractor

Senior Angular Developer

November 2025 – Present · Remote · AU automotive client

Built purchasing and inventory tracking in Angular for an Australian automotive client. Delivered on the agreed date. It is in production.

Independent full-stack builds

November 2025 – Present · Remote

PlantOps MVP (Agricultural SaaS): Sole engineer on a multi-tenant SaaS MVP (Next.js, NestJS, MySQL) — zero to deployed product, owning architecture and product calls. Shipped background jobs, containerised deployment, and a CI/CD pipeline.
DineWithDalators.com: Designed and launched a full tour booking platform (Next.js, MongoDB) — solo, with real bookings in production from day one, Telegram notifications, and a custom CMS.

Mercu

Closed

Full-Stack Developer

May 2024 – October 2025 · Remote

Redesigned the media processing pipeline, cutting file sizes by ~80% — faster loads and lower running cost.
Diagnosed and fixed MSSQL connection pool exhaustion under load, restoring production stability without downtime.
Hangfire background jobs kept message scheduling running.
Shipped Twilio and Cronofy integrations alongside that scheduling.
Worked hands-on with AWS (EC2, S3, Lambda, RDS) in production.
Worked on an AI-powered hiring platform with RAG architecture, using Pinecone for embedding storage and contextual candidate intelligence.
Built the virtual interview module end-to-end (ASP.NET Core, Angular, MySQL) and integrated OpenAI Whisper for transcription, chained into a custom OpenAI scoring prompt for automated candidate review.

Simplify Dalat

Full-Stack Developer

January 2021 – May 2024 · Lam Dong, VN

Led a full Angular frontend refactor (v8–17) across a large codebase — improved long-term maintainability without disrupting ongoing feature delivery.
Mentored 3 junior developers and established frontend coding standards adopted across the team.

B-Gate Solutions

Back-End Developer (.NET)

May 2020 – November 2020 · Lam Dong, VN

Delivered CRM modules (ASP.NET MVC, Entity Framework, AngularJS) in a startup environment — contributed to feature shipping across the full stack from day one.