DPDivya Patel Let’s talk

Backend & Cloud Engineer

Open to remote roles

Hi, I’m Divya. I design and run cloud infrastructure Infrastructure as Code serverless backends caching with Redis event-driven services CI/CD pipelines observability security hardening self-hosted LLM inference cloud infrastructure, Infrastructure as Code, serverless backends, caching with Redis, event-driven services, CI/CD pipelines, observability, security hardening and self-hosted LLM inference in production. Infrastructure comes first; I build the services on top in Node.js and TypeScript.

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Ahmedabad, India · UTC+5:30

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01 About

About Divya

Backend & cloud engineer with 3+ years of production systems on AWS. At Refy9 I’m the main contributor to the Terraform for the whole AWS account and lead developer of OKKAI’s core API: serverless and event-driven services, caching with Redis, CI/CD, observability, security hardening and self-hosted LLM inference, with the services built in Node.js and TypeScript.

Based in Ahmedabad, India (UTC+5:30). Open to remote roles.

Illustrated portrait of Divya Patel in a black hoodie, with headphones around his neck
Divya Patel (he/him)Backend & Cloud Engineer

  • 45+

    Lambda functions run with GitHub Actions CI/CD

  • <2 s

    cold starts, down from slower

  • 54

    -point server checklist for Google’s CASA

  • 3+

    years building production systems

  • 144

    API endpoints tested against live dev

  • 140

    notification types in one service

02 How I build — Refy9, OKKAI

The system I run in production.

A simplified view of the platform I work on. Scroll to take it apart, layer by layer.

  1. 01 / 06

    Requests in

    • Lead developer of the core Node.js/TypeScript API (Express 5, Sequelize, Zod-generated OpenAPI, JWT + Google OAuth via a Lambda authorizer, SQS jobs); co-develop the admin API and Next.js dashboard.
    • Built Google sign-in and Gmail/Calendar consent (offline tokens, scope checks) and connected it to the wardrobe-import and calendar-based styling services.

  2. 02 / 06

    Serverless at scale

    • Run 45+ Lambda functions with GitHub Actions CI/CD that redeploys only the functions a change affects; cut cold starts to under 2 s and stabilised Aurora connections with a shared PgBouncer pool.

  3. 03 / 06

    Caching

    • Built caching into the core API, with Redis as the shared cache in front of Aurora PostgreSQL.

  4. 04 / 06

    Infrastructure as Code & security

    • Maintain the Terraform for the whole AWS account as its main contributor and one of two reviewers; hardened IAM (per-developer keys, rotation) and made Aurora private behind an SSM bastion.
    • Prepared OKKAI for Google’s CASA security assessment (restricted Gmail scopes): rate limiting, audit logging, ClamAV scanning of uploads, SSH opened only to CI runners, and a 54-point server checklist.

  5. 05 / 06

    Async & real-time

    • Built the notification service on Firebase Cloud Messaging (500-recipient bulk sends, 140 notification types, frequency caps, EventBridge scheduling) and WhatsApp OTP via the Meta Cloud API.
    • Built the first Communities backend (SQS FIFO event feed, REST API, API Gateway WebSocket chat) and tested all 144 API endpoints against live dev, fixing 4 bugs.

  6. 06 / 06

    Observability & AI

    • Set up and run the EC2 servers for the AI team’s services (deploy CI, Docker, Nginx) and built their Grafana dashboards and alerts, with Grafana Alloy agents shipping metrics and logs to Prometheus and Loki.
    • Set up a self-hosted Gemma LLM on RunPod GPUs with the AI team (vLLM, OpenAI-compatible API), cutting third-party AI API costs.

03 Journey

Let’s go back in time.

  1. Feb 2026 – Present

    Backend & Cloud Engineer at Refy9

    Product: OKKAI, an AI fashion stylist and digital wardrobe platform (mobile and web)

    • Lead developer, core API
    • Caching with Redis
    • Terraform for the whole AWS account
    • 45+ Lambda functions
    • CASA security assessment
    • Grafana dashboards and alerts
    • Self-hosted Gemma LLM
    See how I build it, in 3D

  2. Feb 2024 – Jan 2026

    Full-Stack Developer at Blisslers Technolabs LLP

    • Built production backends for client products in golf training, ad-tech, carbon credits, EV lifecycle and fuel monitoring with Node.js, TypeScript, Express, MongoDB and PostgreSQL (key projects below).
    • Designed serverless, event-driven microservices on AWS (Lambda, API Gateway, EventBridge, SQS, RDS) and handled deployments and CI/CD for client releases.

  3. Feb 2023 – Jan 2024

    Freelance Developer self-employed

    • Delivered small web projects during college and redesigned the TweeFeed Chrome extension’s interface, adding brand settings to the extension and its website (Plasmo, Next.js, TypeScript).

04 Key projects — Blisslers Technolabs LLP

Client work, shipped.

Five client products, each in a different industry. Golf Daddy and E4RTH are live: their cards open the sites.

P-01 · Golf training

Golf Daddy

A golf training and gaming platform that connects players and coaches.

  • Developed the APIs behind the Coach Portal and User App.
  • Designed serverless microservices on AWS: Lambda, API Gateway, EventBridge, SQS and RDS.
  • Implemented event-driven workflows and dynamic notifications for gameplay and session updates.
  • Node.js
  • TypeScript
  • Aurora PostgreSQL
  • AWS Lambda
  • API Gateway
  • EventBridge
  • SQS
  • RDS
  • Amazon S3

P-02 · Carbon credits

E4RTH

A platform that rewards environmental action through carbon certificates.

  • Built REST APIs for user onboarding, project registration and certificate tracking.
  • Integrated third-party services to verify and manage carbon credits.
  • Modelled the database for projects, credits and users.
  • Node.js
  • Express.js
  • MongoDB
  • Amazon S3

P-03 · Ad-tech

AdUP

A Chrome extension that replaces the New Tab page with dynamic content and ads.

  • Built the admin portal and backend for users, ads and real-time analytics.
  • Integrated the Google Ads / AdSense APIs, with dashboards for earnings, impressions and clicks.
  • Added JWT authentication with role-based access; stored user and extension data in MongoDB.
  • Node.js
  • TypeScript
  • Express.js
  • MongoDB
  • React.js
  • Plasmo

P-04 · EV lifecycle

GREEN_EV

A multi-role CRM that manages the full lifecycle of electric vehicles.

  • Built the entire backend for 5 roles: Admin, Dealer, Service Station, Manufacturer and EV Owner.
  • Developed role-based APIs for inventory, bookings, servicing, billing and ticketing.
  • Created modules for reporting, real-time status updates and lifecycle tracking.
  • Node.js
  • TypeScript
  • Express.js
  • MongoDB
  • React.js

P-05 · Fuel monitoring

Petrol Pump

A real-time monitoring system for fuel dispensers.

  • Ingested live dispenser data over MQTT and recorded every transaction automatically.
  • Built real-time dashboards for fuel and transactions, plus PDF reports and billing.
  • Added role-based user and admin management.
  • Node.js
  • TypeScript
  • Express.js
  • MQTT
  • MongoDB
  • React.js

Working in another industry?

Let’s talk

05 Industries

Different industries, same problems.

I’ve built production backends in six industries: OKKAI at Refy9, and the five client projects above. The domains change; the backend work repeats.

  • Sign-in and roles

    JWT, Google OAuth and role-based access, for coaches and players, dealers and EV owners, users and admins.

    • Fashion & AI
    • Golf training
    • Ad-tech
    • EV lifecycle
    • Fuel monitoring

  • Live data

    Real-time analytics and status updates, dispenser data over MQTT, and chat over WebSockets.

    • Fashion & AI
    • Ad-tech
    • EV lifecycle
    • Fuel monitoring

  • Events and queues

    EventBridge and SQS for event-driven workflows, scheduling and background jobs.

    • Fashion & AI
    • Golf training

  • Notifications

    Gameplay and session updates, 140 notification types with frequency caps, and WhatsApp OTP.

    • Fashion & AI
    • Golf training

  • Third-party APIs

    Gmail, Google Calendar, Google Ads and AdSense, the WhatsApp Cloud API, and carbon-credit verification services.

    • Fashion & AI
    • Carbon credits
    • Ad-tech

  • Reports and billing

    Dashboards for earnings, fuel and transactions, PDF reports, billing and ticketing.

    • Ad-tech
    • EV lifecycle
    • Fuel monitoring

06 Skills

The toolbox I reach for.

System design
Serverless, event-driven microservices on AWS, caching with Redis, connection pooling with PgBouncer, SQS FIFO queues, WebSocket APIs, cold starts under 2 s
Cloud (AWS)
Lambda, API Gateway, EC2, VPC, S3, Aurora PostgreSQL, SQS, EventBridge, CloudFront, WAF, Route 53, IAM, Secrets Manager, SES
IaC & CI/CD
Terraform (Infrastructure as Code), GitHub Actions, Docker, Nginx
Observability
Grafana, Prometheus, Loki, Grafana Alloy
Security
IAM hardening, rate limiting, audit logging, ClamAV upload scanning, SSM bastion access
Databases
PostgreSQL, MongoDB, PgBouncer, Redis
Backend
Node.js, TypeScript, JavaScript, Express.js, REST APIs, OpenAPI, Zod, Sequelize (ORM), JWT, OAuth 2.0, WebSockets, MQTT
LLM serving
vLLM, Gemma, RunPod (GPU), OpenAI-compatible APIs
Integrations
Gmail & Google Calendar APIs, Firebase Cloud Messaging, Meta WhatsApp Cloud API
Frontend
React.js, Next.js, TanStack Query, Tailwind CSS

07 Education

Education

Aug 2024 – May 2026

Master of Science in Information Technology (part-time)

Ganpat University · CGPA 7.74/10

Jul 2021 – Jun 2024

Bachelor of Science in Information Technology

Ganpat University · CGPA 7.85/10

08 Contact

Let’s build something reliable.

Hiring for a cloud or backend role, or need someone to design and run your AWS infrastructure and the services on it? Send a note; I reply by email.

Divya PatelBackend & Cloud Engineer, Ahmedabad

Based in
Ahmedabad, India (UTC+5:30)

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What’s it about?

Your message goes straight to iamdivypatel@gmail.com.