Available for Work

Piyush
Sontakke

>Full-Stack Engineer

ProductEngineerwhoships—notjustcodes

Full-Stack Product Engineer · Pune · Python · Django · React · GenAI

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2.5+

Years Shipping

Companies

Payment Integrations

E2E

Ownership

Founder-led business

ElixirFlow

See the business website behind my product engineering and delivery work.

Visit ElixirFlow

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// about me

I don't just
write code.
I own products.

Ships Fast

0→1 product delivery

Full Ownership

Schema design to production deployment

Systems Thinker

Backend architecture, async pipelines

I think in systems, not just features. From database schema to deployment pipeline, I make architecture decisions - not just implement tasks handed to me. I'm the engineer who asks "why are we building this?" before asking "how?"

For 2.5 years, I've built production backend systems across two companies. At Hushbox Gifting Solution, I own the full backend as Lead Product Engineer - APIs, payment integrations, async pipelines, deployment. At Techdenovo before that, I built fintech integration workflows connecting multiple payment gateways with 100% reconciliation accuracy.

Now I'm expanding into AI - completing a PG Certification in Generative AI & Multi-Agent Systems from IIT Mandi, and building with OpenAI APIs, LangChain, and RAG pipelines. Evolving from backend engineer to AI-capable product engineer.

> skills --list --all

Backend & APIs

PythonDjangoDjango REST FrameworkREST APIsWebhook ArchitectureJWT AuthRBAC

Async & Queues

CeleryRedisBackground JobsCron Scheduling

Databases

PostgreSQLDjango ORMQuery Optimization

Infrastructure

AWS EC2DockerNginxLinux

Frontend

ReactNext.jsTypeScriptTailwind CSSReduxZustandTanStack Query

Animation

Motionlearning

Testing

pytestJestlearningCypresslearningPlaywrightlearning

Tools

GitPostmanFigmaDocker Compose

AI / GenAI

In Progress

OpenAI APIRAG PipelinesPrompt EngineeringLangChainLlamaIndexVector DatabasesAI AgentsMulti-Agent SystemsLLMOps

// experience

Where I've shipped

Lead Product Engineer

Hushbox Gifting Solution Pvt. Ltd.

Nov 2025 – PresentRemote

StartupFull Backend OwnershipRemote

Own the full backend lifecycle — schema design, API development, payment integrations, Docker/Nginx deployment on AWS EC2, and production stability monitoring.

Associate Software Engineer

Techdenovo

May 2024 – Nov 2025India

FintechAPI IntegrationsBackend

Built fintech integration workflows connecting SabPaisa, PhonePe, and Pinelabs APIs with 100% reconciliation accuracy.

// projects

What I've built

ProductionPrivate · Company Product

Gyfton

Product Gifting Platform — backend architecture & API development

Next.jsPythonDjango Rest FrameworkPostgreSQLRedisCeleryAWS EC2NginxGunicornDockerAWS S3

▸Architected backend APIs for products, orders, categories, and user management with clean service separation

▸Implemented secure JWT authentication and role-based access control (RBAC)

▸Built webhook-driven integrations for async data fetching from external catalogue and logistics providers

▸Background task processing using Celery/Redis for order lifecycle management and audit logging

▸Automated tests (pytest) covering API endpoints, webhook simulations, and integration edge cases

▸Deployed on AWS EC2 with Docker Compose and Nginx, optimized for high concurrency

In ProgressIn active development

High Concurrency Ticketing

Flash-sale ticketing: 10,000 users, 100 seats, zero double-bookings

DjangoDRFPostgreSQLRedisCeleryDockerPrometheusGrafanaSentry

architecture.md

> Hybrid Locking:Redis SETNX + PostgreSQL SELECT FOR UPDATE

> Idempotency Keys:UUID on all payment ops

> CAP Theorem:CP — Consistency over Availability

> Architecture:SOA Monorepo

> Failure Handling:Redis fallback → DB locks

> Reconciliation:Celery Beat cron for orphaned locks

<200ms

Seat Check

<2s

Booking

99.9%

Uptime Target

10x

Traffic Spike

Roles: Attendee · Organizer · AdminTickets: VIP · Early Bird · Standard

View on GitHub

// education & certifications

Credentials

B.Tech — Electronics & Communication Engineering

Rajiv Gandhi College of Engineering, Chandrapur

2023·India

PG Certification in Generative AI & Multi-Agent Systems

CodingNinjas × IIT Mandi-TIH

NSDC Approved · Govt. Recognized · Skill India

In Progress

Module 2 of 450%

Prompt EngineeringRAG PipelinesLLM APIsAI AgentsMulti-Agent SystemsLangChainLlamaIndexVector DBsLLMOps

// contact

Let's connect

Open to new opportunities

Founding Engineer · Product Engineer · Backend Engineer

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2.5+

Years