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Simarpreet singh

@simarpreetsingh

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Backend Software Engineer at Atvantiq Networks building ONAQT’s multi-tenant SaaS APIs and Zoho Books synchronization.

India

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At Atvantiq Networks Pvt Ltd, I developed FastAPI and PostgreSQL APIs for ONAQT, a multi-tenant workforce management SaaS. I built its authentication and authorization layer and implemented Zoho Books synchronization for accounting data.

For SusMafia, I developed a WhatsApp prospecting agent that lets users query a private climate-tech executive database, backed by a retrieval-augmented generation system. I also built the Smart Router for multi-model LLM orchestration and a PII masking layer.

Experience

Work history, roles, and key accomplishments

Freelance AI Engineer

SusMafia

Jan 2026 - Nov 2026 (10 months)

Developed an AI prospecting agent on WhatsApp for 40+ users, enabling real-time natural-language queries over a private climate-tech executive database. Built a RAG backend with FastAPI, PostgreSQL, and Supabase, integrated with Twilio WhatsApp API.

fastAPI PostgreSQL Supabase Twilio WhatsApp RAG LLM orchestration PII Masking

Software Engineer (Backend)

Atvantiq Networks Pvt Ltd

Mar 2025 - Nov 2026 (1 year 8 months)

Designed and developed scalable RESTful APIs with FastAPI and PostgreSQL for a multi-tenant workforce management SaaS, owning modules end to end. Built authentication and authorization layers, integrated Zoho Books, and managed Docker-based deployments.

fastAPI PostgreSQL REST APIs JWT OAuth RBAC OTP SQLAlchemy Alembic Docker Linux Zoho Books API Webhooks

Software Engineer Intern

BPTP Pvt. Ltd.

Aug 2024 - Nov 2024 (3 months)

Built a Salesforce app with Lightning Web Components, migrated data via Data Loader, and automated workflows in Asite. Worked with SAP ABAP SmartForms.

Salesforce Lightning Web Components Data Loader Asite SAP ABAP