// backend · cloud · distributed systems

Sagar
Jaswal_

Software Development Engineer — Backend & Cloud

I architect and ship robust, scalable backend cloud systems — from GPU-accelerated video pipelines to serverless event-driven infra. One year deep, enterprise standards, biased toward open-source and cloud-native tooling.

github↗linkedin↗

01 work_experience.log

Experience

Reverse-chronological. Each entry is a deployment.

2025.07 → NOW

Noida, IND

Clipo AI

Backend Engineer

Built a full-stack video rendering platform on FastAPI + PyCaps with GPU-accelerated processing via hybrid MoviePy/FFmpeg workflows — 40+ customizable templates and real-time subtitle burning.
Containerized with Docker Compose multi-stage builds, NVIDIA GPU passthrough, persistent volumes, and an FFmpeg-optimized runtime for production.
Shipped AI-driven social post generation with writing-style analysis for LinkedIn/Twitter, video export, and a download-analytics system.
Deployed on GCP Compute Engine with MongoDB Atlas, Google Cloud Storage, and MSG91 email services.

FastAPIPyCapsFFmpegMoviePyDockerGCPMongoDB Atlas

2025.01 → 2025.07

Chennai, IND

Panoculon Labs

Software Engineer

Launched a cross-platform meeting app in Flutter — real-time transcription, speaker diarization (Whisper), onboarding, tiered subscriptions, referrals, and payments via Apple IAP + Razorpay. Scaled to 300+ users in 2 weeks.
Architected the backend on AWS (Cognito, API Gateway, Lambda, DynamoDB, Amplify) with async S3–Lambda + WebSocket; later migrated to Firebase, halving latency.
Prototyped a context-aware generative-AI system on Gemini + RAG with function calling, vector search, and contextual memory retrieval.
Cut AWS monthly bills by 70% via cost-explorer audits and stale-resource cleanup; maintained the Next.js (React/TS) marketing site with SEO + CI/CD.

FlutterAWSWhisperFirebaseGeminiRAGNext.js

2024.06 → 2024.10

Chennai, IND

Panoculon Labs

Full Stack Developer — Intern

Built and deployed full-stack apps with AWS Amplify, React, Tailwind — responsive, production-ready UIs.
Shipped serverless functions on AWS Lambda + API Gateway and managed DynamoDB storage for performance and reliability.
Fine-tuned a BERT model for text classification and trained a YOLOv8 model for real-time currency detection with augmentation + transfer learning.

AWS AmplifyReactLambdaDynamoDBBERTYOLOv8

2023.08 → 2023.09

Jaipur, IND

Stoild Private Limited

Flutter Developer — Intern

Engineered a live stock-market app in Flutter with real-time updates via StreamBuilder + Provider.
Architected a cricket fantasy backend from scratch on Node.js + Express + MongoDB with robust RESTful APIs.
Optimized backend calls for responsiveness and meaningful cost savings, working in an Agile/Scrum team.

FlutterNode.jsExpressMongoDB

02 projects.d

Selected Builds

Personal & open-source. Code over slides.

Online Coding IDE

↗

full-stack · sandboxed exec

A Next.js + Tailwind IDE with secure auth and tiered (Basic/Advanced) access. File management on MongoDB plus Docker-sandboxed execution for Python, JavaScript & C++ with real-time output.

Next.jsDockerMongoDBTailwind

Serverless Chat

↗

event-driven · realtime

Real-time Flutter chat with auth, friend management, messaging & profiles — backed by a fully serverless AWS architecture: Lambda, API Gateway, WebSocket, DynamoDB, Cognito, deployed via SAM + Boto3.

FlutterAWS LambdaWebSocketDynamoDBSAM

03 stack.toml

Stack

What I reach for.

languages

C++PythonDartJavaScriptHTMLCSS

cloud & infra

AWSGCPDockerLambdaAPI GatewayDynamoDBFirebase

frameworks

FastAPIReactJSNextJSFlutterNode.jsExpressJS

data & ai

MongoDBPostgreSQLMySQLGemini · RAGWhisperBERTYOLOv8Git

04 signals.log

Awards & Open-Source

001

500+ DSA problems solved across competitive platforms — algorithms

002

Hacktoberfest 2021 — open-source contributions to Flutter projects — open-source

003

2nd place — Youth Parliament 2018 , KV No.2 Kozhikode — public speaking

05 writing.log

Writing

Notes from shipping in prod.

Apr 18, 2026·7 min read

Rendering 40+ video templates on the GPU with FastAPI↗

How we built a GPU-accelerated rendering pipeline at Clipo AI — PyCaps, NVIDIA passthrough in Docker, and a job queue that doesn't melt under load.

FastAPIGPUDocker

Mar 2, 2026·6 min read

How we cut our AWS bill by 70% without breaking prod↗

A startup invoice that doubled month over month, a serverless stack that was over-provisioned everywhere, and the unglamorous fixes that actually moved the number.

AWSCostServerless

Jan 21, 2026·5 min read

Shipping a transcription app to 300 users in two weeks↗

Cross-platform Flutter, real-time Whisper transcription, and the scrappy decisions that let a meeting app go from zero to 300 users without an ops team.

FlutterWhisperRealtime

06 contact.sh

Get in touch

Open to build. Drop a message and I'll reply.