Sachin Patel
⚡ Software Engineer · 🐍 Backend Python Developer · 🤖 AI Enthusiast
Backend Software Engineer with 4+ years of experience building scalable async REST APIs, microservices, and AI-powered applications using Python, FastAPI, and cloud infrastructure. Currently pursuing M.C.A. with specialization in AI & Machine Learning.
About Me
Backend Software Engineer with 4+ years of hands-on experience at Infosys, building async REST APIs, microservices, and data pipelines for telecom and networking clients. Delivered backend solutions achieving $700K+ in cost savings.
Currently pursuing M.C.A. with specialization in AI & Machine Learning at Parul University. Working with LLMs, RAG pipelines, and vector databases to build intelligent, production-grade applications.
Technical Skills
Technologies and tools I work with
Languages
Python
JavaFrameworks
FastAPI
SQLAlchemyDatabases
PostgreSQL
MySQL
MongoDB
RedisDev Tools
Docker
Git
GitHub
Swagger
VS Code
AWSAI & ML
Professional Experience
4+ years building backend systems and APIs for global clients
Software Engineer – Python Developer
TekWissen · Netweb Software
Apr 2026 – Present
Vadodara, Gujarat, India
- ▹Developing backend services and REST APIs using Python with a focus on serverless architecture and event-driven systems on AWS.
- ▹Building scalable, cloud-native applications leveraging AWS Lambda, DynamoDB, API Gateway, and related services for high-availability production workloads.
- ▹Designing event-driven pipelines and microservices for efficient data processing and real-time system integrations.
Senior Systems Engineer
Infosys Limited
Aug 2023 – Apr 2025
Remote - Pune, Maharashtra, India
- ▹Designed and developed async REST APIs and microservices using FastAPI and Pydantic for telecom and networking clients, modernizing legacy internal operations tooling and achieving over $700,000 USD in cost savings.
- ▹Implemented data validation layers using Pydantic and SQLAlchemy ORM, reducing data integrity issues in production pipelines and cutting process times by 25% across multiple workflows.
- ▹Collaborated directly with client stakeholders to gather requirements and deliver backend solutions, managing end-to-end ownership of API features with SLA compliance.
- ▹Recognized with 2x CISE RISE Ninja Awards for outstanding performance in backend development within the CIS unit.
Systems Engineer
Infosys Limited
Dec 2020 – Aug 2023
Remote - Pune, Maharashtra, India
- ▹Built and maintained backend APIs and internal tools for telecom clients using Python, FastAPI, and SQL, supporting operational workflows across multiple teams.
- ▹Integrated Redis caching and WebSocket-based real-time communication into client systems, improving data delivery performance and system responsiveness.
- ▹Maintained clear API documentation via OpenAPI/Swagger and collaborated with cross-functional teams across time zones to deliver upgrades on schedule.
- ▹Recognized with 3x Infosys RISE Insta Awards for excellent individual and team performance.
Projects
A selection of projects showcasing backend and AI engineering work.
- ▹Built a RAG application using FastAPI, LlamaIndex, Google Gemini, and Qdrant enabling natural language querying over uploaded documents with grounded answers and source attribution.
- ▹Implemented async ingestion pipeline — document loading, chunking via SentenceSplitter, Gemini embeddings, and Qdrant vector storage — with per-document metadata filtering for targeted queries.
- ▹Developed a WebSocket-based streaming chatbot with Redis-backed persistent conversation memory, sliding window token management, and per-session custom personas using Google Gemini.
- ▹Designed a services layer separating memory operations (Redis) from LLM streaming logic (Gemini), with session TTL-based auto-expiry and graceful WebSocket disconnect handling.
- ▹Built an async FastAPI service using Google Gemini for sentiment analysis, named entity extraction, context-aware Q&A, and dynamic text classification with Pydantic structured outputs.
- ▹Implemented prompt engineering best practices — system prompt templates, few-shot examples, JSON mode — with tenacity retry logic and full OpenAPI/Swagger documentation.
- ▹Developed a scalable backend with Node.js for a Netflix-style platform enabling users to watch and chat in real time via session-based rooms using Socket.IO and JWT-based authentication.
- ▹Designed full MVC architecture and built 25+ secure REST APIs for user auth, video management, session control, and TMDB movie integration; implemented role-based access (admin, host, participant).
Get In Touch
I'm always open to discussing new opportunities, interesting projects, or just having a chat about technology.