Robin Sharma
Verified Expert in Engineering
Full-stack Engineer and Developer
Kashipur, Uttarakhand, India
Toptal member since March 6, 2026
Robin is a full-stack engineer with 4+ years of experience building scalable, production-grade systems. He has worked with domestic and international teams in high-ownership roles, both as a tech lead and as an individual contributor. Robin's expertise spans Python, TypeScript, AWS, Docker, Django, FastAPI, Node.js, React, and Next.js, as well as real-time and VoIP technologies such as WebRTC, SIP, and FreeSWITCH.
Portfolio
Experience
- React - 4 years
- Amazon Web Services (AWS) - 4 years
- Python - 4 years
- Django - 4 years
- TypeScript - 4 years
- Large Language Models (LLMs) - 3 years
- Node.js - 3 years
- AI Voice Agents - 2 years
Preferred Environment
Linux, Docker, Amazon Web Services (AWS), Slack, Google Workspace, Python, TypeScript
The most amazing...
...project I've built is Teler, a cloud communications platform purpose-built for AI agents, providing media streaming, SIP trunking, and server-side SDKs.
Work Experience
Technical Lead
FreJun
- Spearheaded full-stack engineering for an enterprise-grade communications platform, powering 500,000+ business calls per day.
- Built and launched Teler, a global voice infrastructure for LLMs and AI agents, providing media streaming, SIP trunking, and live STT/TTS capabilities.
- Implemented a company-wide observability stack using Grafana, Prometheus, and Loki that slashed mean-time-to-detect by 75%.
- Optimized AWS cloud footprint using EC2, RDS, S3, and data transfer, delivering 50% cost savings via architectural improvements, rightsizing, and spot-instance adoption.
Experience
Teler
https://frejun.ai/Enterprise RAG
https://robinsharma.me/blog/rag/It integrates hybrid retrieval combining BM25 ranking with dense vector search, leverages high-throughput vLLM inference for scalable LLM and embedding workloads, and employs advanced chunking strategies to preserve semantic and structural fidelity. It further supports asynchronous, distributed file indexing with robust status tracking, and provides native ingestion for a broad spectrum of enterprise document formats, including PDF, DOCX, PPTX, XLSX, CSV, and markdown.
VoIP Dialer Chrome Extension
https://chromewebstore.google.com/detail/frejun-chrome-dialler-plu/eninbjdhgaccikhclpomppfcclammnoc?hl=enEducation
Bachelor's Degree in Computer Applications
Maharaja Surajmal Institute - New Delhi, India
Skills
Libraries/APIs
Node.js, React, WebRTC, vLLM, Chrome API
Tools
FreeSWITCH, Slack, Google Workspace, NGINX, Grafana, Visual Language Models (VLMs), Haystack
Languages
Python, TypeScript, C++, JavaScript
Frameworks
Django
Platforms
Amazon Web Services (AWS), Linux, Docker, Google Cloud Platform (GCP)
Paradigms
DevOps
Storage
PostgreSQL, MongoDB
Other
Web Development, AI Voice Agents, Session Initiation Protocol (SIP), Large Language Models (LLMs), Retrieval-augmented Generation (RAG), Vector Databases, Operating Systems, Data Structures, Algorithms, FastAPI, Distributed Systems, WebSockets, Embedding Models
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