Onkar Lapate

Software Engineer

Pune, Maharashtra, India4 yrs 6 mos experience

Key Highlights

Engineered a high-accuracy attribution system.
Optimized APIs reducing response times significantly.
Authored extensive series on Python and Django internals.

Stackforce AI infers this person is a Backend Engineer specializing in Fintech and HealthTech solutions.

Contact

onkar.lapate040@gmail.com LinkedIn

Skills

Core Skills

PythonDjangoStripePostgresqlApi OptimizationFastapi

Other Skills

RedisAWSStripe APIData PipelinesLangChainFlaskOAuthSQLREST APIsSystems DesignBack-End Web DevelopmentWeb Application DevelopmentSoftware DevelopmentPySparkFacebook API

About

Backend Engineer with 5 years of experience building high-performance, scalable systems in Python, Django, and Postgres. I've worked across the full backend surface - API optimization, payment systems, data pipelines, RBAC, and third-party integrations, at startups ranging from early-stage to YC-backed. Most recently at LayerFive, I owned the end-to-end design and delivery of a Stripe-based subscription payments module, engineered an attribution system that went from 80% to 99.5% accuracy, and optimised APIs that were taking 30–80 seconds down to under 6. Outside of work, I write deeply about Python and Django internals on LinkedIn. I've completed a 30+ post series on Python internals (CPython, GIL, memory model, bytecode) and I'm currently 35+ posts into a Django internals series covering the request lifecycle, ORM execution, middleware, and architecture patterns. Writing forces me to understand things properly and it's become one of the most consistent things I do. What I work with: Python · Django · FastAPI · PostgreSQL · Redis · AWS · Stripe · LangChain 📩 onkar.lapate040@gmail.com

Experience

Layerfive

Software Engineer

May 2025 – Present · 10 mos · Pune District, Maharashtra, India · Remote

Tech Stack: Python · Django · PostgreSQL · Redis · AWS · Stripe API · Meta API · Google Ads API
Owned end-to-end design and delivery of the subscription-based payments module — from architecture through production supporting recurring billing, webhooks, proration, and automated notifications using Stripe; reduced payment failures by 20%.
Actively contribute to engineering quality through regular PR reviews and proactive participation in system design discussions; engaged on decisions around data modeling, query optimization, and service boundaries.
Engineered L5 attribution system achieving 99.5% accuracy (up from 80%) and 80% reduction in processing time by consolidating 6 queries into 1 unified DB-driven approach with intelligent priority handling.
Optimized critical APIs: Client Registration (30s → 6s), Marketing Funnel (10s → 1s), IG Organic Posts (80s → 30s).
Built comprehensive integration management system with automated data validation across 5+ ad sources (Meta, Google Ads, Shopify), reducing data inconsistency detection time from hours to minutes with real-time Slack notifications.
Created marketing funnel analytics leveraging PostgreSQL materialized views, tracking 50K+ visitors/day from anonymous to known users; reduced identity resolution query time by 70%.
Implemented RBAC system with custom roles, access groups, and product-module mappings; deployed across entire platform without any downtime.
Built guided onboarding flow with integration status tracking, improving activation rate by 30% and reducing setup time from days to minutes.

PythonDjangoPostgreSQLRedisAWSStripe API

Overstand labs

Software Engineer

Dec 2024 – May 2025 · 5 mos · Pune District, Maharashtra, India

Tech Stack: Python · FastAPI · LangChain · Palantir Foundry · PostgreSQL
Built and integrated a RAG-based search service using LangChain and FastAPI over a Customer Data Platform (CDP), enabling semantic search across 100K+ customer messages per day spanning multiple communication channels.
Developed data ingestion and processing pipelines handling large-scale customer interaction datasets using Palantir Foundry, enabling reliable downstream AI feature development.
Integrated third-party APIs (Slack, Google) enabling structured data inflow into the platform.

PythonFastAPILangChainPostgreSQL

Bombay softwares

Software Development Engineer

Nov 2022 – Nov 2024 · 2 yrs · Mumbai, Maharashtra, India · On-site

Tech Stack: Python · Django · PostgreSQL · Django REST Framework · Flask · Redis · AWS
Project: Messaging Module (Fitness Application)
Developed scalable messaging backend handling 1000+ daily messages with 95% success rate
Implemented asynchronous processing with Redis and RQ workers, reducing response times by 40% during peak traffic
Built task scheduling system delivering notifications across multiple time zones with 99% accuracy
Improved deployment workflows with CI/CD pipelines using AWS EC2 and GitHub Actions, reducing deployment time by 15%
Project: Integrated IoT Admin Panel
Designed database schema supporting multi-level roles and permissions for 500+ users
Implemented secure authentication flows using JWT and OAuth 2.0 (Google API integration)
Engineered RESTful APIs using Django on Linux-based systems