Senior Backend Engineer & Team Lead - SaaS Architect

Abhay Pratap Singh

Senior Backend Engineer · Team Lead

********************@*****.*** +91-829******* LinkedIn

Summary

Senior Backend Engineer and Team Lead with 5+ years of experience architecting scalable multi-tenant SaaS platforms, AI-integrated analytics engines, and high-throughput e-commerce systems. Core expertise in PHP, Laravel, Node.js, and NestJS. Leading cross-functional overseas teams with ownership of architecture, delivery, and mentoring.

Technical Skills

Languages & Frameworks

PHP, Laravel, Node.js, NestJS, TypeScript, JavaScript

Databases

PostgreSQL, MySQL, Prisma ORM, pgvector, Query Optimization, Indexing

AI & Search

OpenAI GPT-4o Mini, GPT-4.1 Mini, LLM-to-SQL, Semantic Search, Vector Embeddings

Caching & Queues

Redis, Laravel Horizon, Async Job Processing, Rate Limiting

Architecture

Multi-Tenant SaaS, REST APIs, DDD, Microservices, Service-Repository, MVC, OOP

DevOps & Cloud

AWS, Docker, Git, CI/CD, Cloudflare

Integrations

ERP (Acumatica), Payment Gateways, Shipping APIs (UPS, FedEx, Purolator), SendGrid, Klaviyo, Google Merchant Center

Security & Auth

JWT with Token Rotation, Session Management, Fraud Prevention

Professional Expeience

Senior Backend Engineer · Team Lead Apr 2021 – Present

Voyantt Consultancy Services LLP, India

Leading backend engineering across multiple SaaS products. Owning architecture decisions, sprint planning, code reviews, and mentoring. Managing cross-functional collaboration with overseas teams across time zones. Reduced API p95 latency by 35% via query optimization, N+1 elimination, indexing, and Redis caching

Estimate Master — Multi-Tenant Financial SaaS NestJS, PostgreSQL, Prisma, Redis, JWT

• Designed tenant isolation using JWT claims + AsyncLocalStorage + Prisma middleware — zero cross-tenant leakage. • Built dual pricing engine (Hourly & OPEX) with profit margin, waste-adjusted costing, and deterministic logic. • Implemented snapshot-based audit model for historical financial integrity across pricing changes.

Frontier Dental — Multi-Vendor E-Commerce PHP, Laravel, MySQL, Redis, Horizon, Acumatica

• Built ERP-integrated storefront with real-time Acumatica sync for products, pricing, inventory, orders, and return• Implemented payments,and marketing tools (SendGrid, Klaviyo, Google Merchant Center) and courier (UPS,ICS)— reducing invalid signups by 18%. • Used Redis queues + Horizon for async processing with real-time throughput monitoring.

Dialpad Call Intelligence — AI Analytics Engine NestJS, PostgreSQL, pgvector, Redis, OpenAI

•Designed LLM-to-SQL pipeline (GPT-4o Mini) converting natural language to optimized PostgreSQL queries. • Implemented pgvector semantic search over transcript embeddings for similarity retrieval at scale.

Education

B.Tech in Mechanical Engineering 2015 – 2019 Dr. A.P.J. Abdul Kalam Technical University

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