Ashwani Shakya

Backend Engineer

Mainpuri, UP 3+ yrs exp 87 · Excellent

About

Backend Engineer with 4+ years of experience building and scaling high-performance REST APIs, microservices, and distributed systems using Python (FastAPI) and Node.js. Expert in designing event-driven architectures, PostgreSQL optimization, and real-time systems with WebSockets, Redis, and Celery. Experienced in integrating AI capabilities (RAG pipelines, embeddings, OpenAI) into production backends. Proven track record of reducing query latency by 95%, improving messaging throughput by 40%, and delivering robust, high-availability platforms supporting large concurrent user loads end-to-end.

Skills & Expertise (29)

Python Advanced

8.6/10

Years Exp

FastAPI Advanced

8.4/10

Years Exp

REST APIs Advanced

8.2/10

Years Exp

Microservices Advanced

8.0/10

Years Exp

Postgresql Advanced

8.0/10

Years Exp

WebSockets Docker Postman Swagger AWS EC2 S3 Lambda OpenAI API RAG Pipelines Embeddings RabbitMQ Celery Cd pipeline JWT Git Redis MongoDb MySql Express.js Node.js SQL Typescript JavaScript

Work Experience

Backend Engineer

Digi Interacts Pvt Ltd

May 2025 - Apr 2026

Built and scaled REST APIs for real-time chat and voice systems, ensuring low-latency and high-throughput performance for thousands of concurrent users. Deployed and integrated locally hosted TTS models (Kitten TTS) along with OpenAI APIs into backend systems for real-time voice and chat interactions, reducing dependency on external services. Designed backend architecture handling 5k+ concurrent users with low-latency communication using FastAPI, Redis, and async processing. Optimized PostgreSQL queries, reducing latency from 200ms to <10ms — a 95% improvement in response time. Built event-driven knowledge ingestion pipelines using async workers (Celery/Redis) for real-time data processing. Designed idempotent billing system with Stripe ensuring transactional accuracy under concurrent load.

Backend Developer

Janbask Consulting Pvt Ltd

Sep 2022 - Apr 2025

Built scalable REST APIs and microservices for multi-tenant CRM systems used by enterprise clients. Developed a Python (FastAPI) based microservice for a core CRM module, integrating seamlessly with the existing Node.js backend via REST APIs. Implemented RBAC and JWT-based authentication for secure, role-governed access control. Improved real-time messaging performance by 40% using event-driven architecture (RabbitMQ, MongoDB). Designed and maintained relational database schemas with optimized queries and data lifecycle management.