Senior Full Stack Engineer
Back-end Engineer
Available for hire
Years of
experience
11+ years
Experience
level
Staff
Available
for
Full-time, Contract, Freelance
Available from
23 Jun 2026
I am a CTO and co-founder with 11+ years of experience in full-stack engineering, specializing in AI systems, distributed architecture, and blockchain infrastructure. Currently, I lead Katha Ads, an AdTech platform I co-founded, which has scaled to 1.2M+ users and ₹5+ crore ARR, with products across creator marketing, AI-driven influencer intelligence, and regional content.
I have deep expertise in LLMs, RAG, microservices, Kubernetes, and cloud platforms (AWS, GCP, Azure), along with extensive experience in Web3 and crypto systems, including building a cryptocurrency exchange that was later acquired and developing Solana analytics infrastructure.
Previously, I’ve held leadership roles at Topledger, DeHaat, and Sama, where I built large-scale systems, IAM solutions, fintech integrations, and cross-border payment platforms.
Overall, I bring a combination of deep technical expertise, startup leadership, and strong product thinking, with a proven track record of building and scaling complex, high-impact systems.
Skills
JavaScript
CSS
Astro.js
TypeScript
Solidity
React.js
Next.js
React Native
TensorFlow
Node.js
Express.js
Tailwind CSS
SQL
Redis
Kafka
Elasticsearch
Web sockets
gRPC
Docker
AWS
Azure
Vercel
Blockchain
Opencv
GitLab
SASS
OpenShift
GCP
Software as a Service
Web components
NoSQL
REST
Lambda
JIRA
Kubernetes
Web3
Micro-frontends
Microservices
OpenAI
jQuery
Swagger
JSON
Jest
npm
Selenium
Mongoose
Netlify
JWT
Socket.io
Puppeteer
CircleCI
RPC
NextAuth
Sentry
SCSS
PostCSS
Ant Design
Natural Language Processing
Text to speech
Speech to text
Responsive design
MERN stack
LAMP stack
MongoDB
PostgreSQL
MySQL
Firebase
Dynamodb
SQLite
Heroku
RabbitMQ
SQS
Digital Ocean
Cloudflare
Git
GitHub
Figma
Agile
CI/CD
ChatGPT
Machine Learning
Payment gateways
Webhook
Serverless
OAuth
E-commerce
Progressive Web Apps
Server Side Rendering
Platform as a Service
Infrastructure as a Service
Smart Contract
Crypto
Generative AI
Large Language Models
HTML
Python
Bash
Java
Rust
Ruby
BigQuery
Cassandra
Clickhouse
Hetzner
Akamai
Hostinger
WordPress
Flask
Spring Boot
Django
FastAPI
Ruby on Rails
NumPy
Pandas
Spring Framework
Apache Kafka
Cloudwatch
PyTorch
Capacitor
Airflow
LangChain
Languages
Employment History
Technical Lead at
Topledger
2022
-
2024
Web3 data infrastructure and analytics platform that provides real-time and historical insights on
Solana to help developers, analysts, and institutions make data-driven decisions.
• Architected Solana on-chain data analytics systems in Python and Rust; built custom binary
parsers for decoding tightly-packed Solana account and transaction data that no off-the-shelf tool
handled correctly.
• Built and deployed WebAssembly (WASM) libraries executing inside Google BigQuery as
user-defined functions (UDFs) — a rare in-database computation pattern enabling analysts to
query raw Solana data directly from the warehouse.
• Optimised data storage using Apache Parquet columnar format for scalable analytics throughput
Technical Lead at
DeHaat
2021
-
2022
Agritech platform providing farmers with end-to-end agricultural services, from inputs to market
access.
• Led API architecture for agri supply-chain platforms (AgriTech) connecting farmers to
food-processing companies across India.
• Managed a cross-functional team of 12 engineers (backend and frontend) across multiple
concurrent product lines.
• Built centralised Identity and Access Management (IAM) for the DeHaat ecosystem on Keycloak
— including OAuth 2.0 / OpenID Connect (OIDC) flows and Single Sign-On (SSO) — leading a
7-member cross-platform team and designing custom authentication flows for internal clients and
services.
India
Phone: +91 96364 46294
• [email protected]
• abouthvs.com
• linkedin.com/in/harsh-vardhan-sharma-06a4049a
• github.com/harshvardhansharma
EDUCATION
Antler, Singapore, Entrepreneur in Residence
JAN – MAR 2019
Selected to be a part of 2nd cohort of Antler
Singapore; amongst world’s 100 founders
BITS Pilani, Pilani, India
2011 – 2015
M.Sc. (Tech.) Information Systems
CGPA 7.69
INTERNSHIPS
Amazon, Chennai, India
JUL 2014 – DEC 2014
Designed and implemented a repository
service for Registration, Version Controlling
and Domain Separation of config files.
Functionality was exposed via APIs using the
REST framework.
BISAG, Gandhinagar, India
MAY 2013 – JUL 2013
Dynamic Creation of Bump Images and
Profile Generation from DEM. Worked on
creating 3D images of India using Geo-TIFF
images showing the impact of an
earthquake.
ACHIEVEMENTS AND AWARDS
BISAG INNOVATION CHALLENGE, D.S.T,
Govt. of Gujarat, Winner – 2013.
Application is in production and is backed
by the then CM of Gujarat, Mr. Narendra
Modi
HISAAB, .NET Innovation Challenge–2014,
IIM – Ahmedabad, top 10 teams for final
presentation of a startup idea
• Output Domain workflows in Odoo ERP and integrated them with downstream APIs.
CoFounder & CTO at
Katha Ads
Current
2020
-
Now
Vernacular focused AdTech and creator marketing platform building scalable products across
influencer intelligence, WhatsApp-status advertising, and regional content ecosystems for South
India. Leading product, engineering, and platform strategy:
• Conceptualized & scaled Unizone from zero to 1.2M+ users and INR 5Cr+ ARR, architecting
high-throughput WhatsApp-status ad delivery, attribution, analytics, and event-driven fulfillment
systems end to end.
• Architected IGNITE, an AI-first influencer intelligence platform, including MediaScribe — a
multimodal video understanding system for transcript extraction, scene/visual analysis, hook
detection, creator scoring, and engagement/play-rate prediction powering automated campaign
execution at scale.
• Creator-support RAG bot - OpenAI text-embedding-3-small + Pinecone FAQ retrieval,
GPT-4o-mini intent classification (10+ categories), grounded multilingual support (Hindi, Tamil,
Telugu, Malayalam, Kannada).
• Built Katha News, a regional content platform reaching 200K+ installs, with on-device ML feed
ranking, automated content ingestion, QC, and text-to-speech audio pipelines for personalized
vernacular consumption.
• Reduced infrastructure costs by 95% (USD 5,000 → USD 200/month) across 40–50 TB monthly
CDN traffic through delivery architecture optimization, caching strategy, and cost engineering.
• Cut WhatsApp communication costs by 85% across 500K+ monthly messages via smarter session
orchestration, routing logic, and messaging infrastructure redesign.
Technical Consultant at
Sama
2019
-
2021
• Owned full-stack engineering across web, mobile, infrastructure, and security for a
Singapore-based FinTech serving blue-collar migrant workers across Southeast Asia.
• Integrated WhatsApp Business API via Twilio for a two-way Slack-based customer
support channel with on-the-fly language translation for multilingual users — a
conversational commerce integration.
• Built Optical Character Recognition (OCR) and Robotic Process Automation (RPA)
onboarding and verification flows directly on WhatsApp, including SGWorkPass work-visa
verification for Singapore — a KYC / identity verification workflow.
• Enabled cross-border payments from Singapore to India, Indonesia, Vietnam,
Bangladesh, and Philippines using Rapyd APIs and in-app digital wallet infrastructure.
• Built a digital credential store for blue-collar worker certifications, work history, and
education records.
Technical Consultant at
Biqmind
2019
-
2020
Singapore-based cloud-native technology company specializing in Kubernetes, DevOps,
and application modernization.
• Setup a video content streaming service using ApsaraVideo VOD on Alibaba Cloud.
• Led the setup and guidance of an internal team to deliver a customer onboarding
application for Malaysian Bank(AmBank) in Kuala Lumpur - developed in partnership with
Red Hat on Red Hat OpenShift.
• Built a tool for managing multi-cluster Kubernetes applications for Disaster Recovery
(DR) and High Availability (HA) — a cloud-native infrastructure engagement.
CoFounder at
Absolute
2019
-
2019
NFC based anti-counterfeit platform for brands, raised 100k SGD from Angels.
• Founded an NFC (Near Field Communication) anti-counterfeiting platform connecting
physical products to digital systems — IoT / hardware-software integration at the
intersection of brand protection and supply chain authentication.
• Led end-to-end product development: proprietary cryptographic tag-encoding
algorithms, web application, native Android and iOS mobile apps, analytics dashboard,
third-party integrations, and cloud infrastructure.
Software Engineer at
Synaptic
2016
-
2019
Data engineering at a market-intelligence platform — multi-source extraction,
Lambda-backed image infrastructure, and an early production Web3 analytics module
(pre-dating the 2020 DeFi cycle).
• Built microservices for multi-source data extraction, Extract-Transform-Load (ETL)
processing, and analytics, feeding into analytical dashboards.
• Developed an AWS Lambda–based image server for converting and storing scraped
assets (images, logos).
• Wrote advanced SQL on large datasets using Amazon Redshift and Amazon Athena.
• Built a cryptocurrency analytics module tracking market data, GitHub activity, news,
trading volume, and social signals across Facebook, Twitter, and Reddit.
• Executed on-chain analysis for Bitcoin, Ethereum, and ERC-20 tokens — evaluating user
growth, active users, wealth distribution, miner community strength via hashrates, and
mempool statistics (transaction count, size, fees).
Software Engineer at
Snapdeal
2015
-
2016
E-commerce platform engineering at Snapdeal during its peak scaling period — then one
of India's three largest online marketplaces.
• Built the Seller side shipping module - REST APIs for the SellerFront mobile app and
KAM (Internal Account Manager app).
• Implemented a Two-Factor Authentication (2FA) filter for the KAM app.
• Scheduler to sync data daily from the data warehouse to Aerospike servers for
low-latency APIs.
Education
Bachelors of Computer Science at
BITS, Pilani (Pilani Campus)
2011
-
2015