Freelance Data Engineers in GandhinagarFreelance Data Engineers in Gandhinagar
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Kalpesh Prajapati's avatar
Kalpesh Prajapati
Ahmedabad, India
Experienced Senior Software Development Engineer
New to Contra
Experienced Senior Software Development Engineer
Cover image for A healthcare booking platform connecting
A healthcare booking platform connecting patients with the right doctor: Patients search by speciality, see genuinely live availability, and book a slot in a few taps. The hard part is concurrency: two patients tapping the same 10:30 slot at the same moment must not both get it. Slot locking and transactional booking make that safe, and reminders cut no-shows. Built - Doctor search and profiles with speciality and location filters - Real-time slot availability with race-safe booking and cancellation - Appointment lifecycle: book, reschedule, cancel, remind - Patient records with role-based access, so staff see only what they should
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Cover image for Baccarat — real-time multiplayer card
Baccarat — real-time multiplayer card game: An online Baccarat table where players bet, deal and settle in real time, together. Multiple players sit at the same table and watch the same round unfold at the same instant, so every client has to stay in sync to the card. A server-authoritative game loop runs the round — betting window, deal, third-card rule, settlement — and pushes state over WebSockets, which means no client can influence the outcome. The shoe is shuffled with a cryptographically secure RNG and every round is recorded, so any hand can be replayed and verified after the fact. **Built** - Player / Banker / Tie betting with per-round bet windows and limits - Real-time multiplayer tables synchronised over WebSockets - Server-authoritative game loop implementing full Baccarat drawing rules - Cryptographically secure RNG shuffle with a verifiable, replayable round log - Automatic settlement, payout and per-player hand history
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Cover image for A central authorization service that
A central authorization service that decides who can do what — in real time: Instead of permission checks scattered through every service, one engine answers a single question: given this user, this action and this resource, ALLOW or DENY? Policies combine roles (RBAC) with attributes (ABAC) — department, ownership, region, time of day — so product teams change a policy instead of shipping code. Every decision is logged, which is what auditors actually ask for. Built - Role-based and attribute-based policy evaluation - Low-latency decision API with policy caching - Policy authoring and versioning, so changes are reviewable and reversible - Immutable audit log of every allow/deny decision
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Cover image for An e-commerce storefront for buying,
An e-commerce storefront for buying, gifting and redeeming digital gift cards. Customers pick a card and an amount, pay through a secure checkout, and the recipient gets the card by email within seconds. Behind it sits the part that actually matters: a balance ledger that stays correct under concurrent redemptions, idempotent payment handling so a retried request never double-charges, and a full audit trail of every issue and redemption. Built - Card catalogue, custom amounts and gift-to-a-friend flow - Payment gateway integration with idempotent, retry-safe order handling - Email delivery pipeline for instant card issuance - Balance, partial redemption and expiry logic backed by a transactional ledger
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Data Engineer(1)
Jineshwar Khatri's avatar
Jineshwar Khatri
Ahmedabad, India
Data Expert: BI, Modelling & Pipeline Developer
Data Expert: BI, Modelling & Pipeline Developer
Cover image for Developing Reliable Data Pipelines
Developing Reliable Data Pipelines
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Cover image for Building a Highly Interactive Dashboard
Building a Highly Interactive Dashboard
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Cover image for Persona Development - Customer Segmentation
Persona Development - Customer Segmentation
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Data Engineer(1)
Hittanshu Bhanderi's avatar
Hittanshu Bhanderi
Ahmedabad, India
Data Analysis Expert
Data Analysis Expert
Cover image for Real-Time Face Recognition
Real-Time Face Recognition
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5
Cover image for Covid cases tracker
Covid cases tracker
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5
Cover image for Bank Loan Defaulter Prediction
Bank Loan Defaulter Prediction
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Data Engineer(1)
Krupa Parmar's avatar
Krupa Parmar
Ahmedabad, India
Data Engineer · Python · Airflow · dbt · Kafka · AWS
New to Contra
Data Engineer · Python · Airflow · dbt · Kafka · AWS
Cover image for Project 4 — RAG Document
Project 4 — RAG Document Chatbot Title: RAG Document Chatbot — LangChain · ChromaDB · Streamlit Description: Fully local RAG application: PDF ingestion → 500-token semantic chunking → 73-chunk ChromaDB vector store → LangChain retrieval chain with source citations and multi-turn memory. Streamlit UI, no external API dependency. Link: https://github.com/Krupa03/rag-document-chatbot
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Cover image for Project 3 — Data Quality
Project 3 — Data Quality Checker Title: Data Quality Checker — AWS S3 · Terraform · GitHub Actions Description: A CLI tool automating data quality checks (nulls, duplicates, referential integrity, freshness, and schema drift) on a Kimball star-schema warehouse. AWS S3 provisioned as IaC with Terraform. Full CI/CD via GitHub Actions on every push. Link: https://github.com/Krupa03/data-quality-checker
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Cover image for Project 2 — Real-Time Sales
Project 2 — Real-Time Sales Pipeline Title: Real-Time Streaming Pipeline — Kafka · PySpark · Grafana Description: Real-time event pipeline processing $368,919 in transaction volume at 110 orders/minute peak. Python producer → Kafka → PySpark Structured Streaming → TimescaleDB → Grafana dashboard with 30s auto-refresh. Full stack on Docker Compose. Link: https://github.com/Krupa03/realtime-sales-pipeline
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Cover image for Project 1 — E-Commerce ELT
Project 1 — E-Commerce ELT Pipeline Title: E-Commerce ELT Pipeline — Airflow · dbt · BigQuery Description: End-to-end ELT pipeline on 99.4K Brazilian e-commerce orders. Airflow orchestrates daily ingestion into BigQuery → dbt transforms across staging to mart layers. Surfaced R$16.4M customer LTV and R$1.25M peak monthly revenue for Looker Studio dashboards. 16 consecutive successful DAG runs under 6 minutes. Link: https://github.com/Krupa03/ecommerce-elt-pipeline
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Data Engineer(4)
Aliabbas Bhojani's avatar
Aliabbas Bhojani
Ahmedabad, India
Cloud & Data Engineer, DevOps, Software Dev
Cloud & Data Engineer, DevOps, Software Dev
Cover image for Advertising and Marketing Analysis
Advertising and Marketing Analysis
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Cover image for Customer Data Platform
Customer Data Platform
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Cover image for Real Time Pose Estimation
Real Time Pose Estimation
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Data Engineer(2)
Nihar Thakkar's avatar
Nihar Thakkar
Ahmedabad, India
#1 Data Analytics Professional at Contra
#1 Data Analytics Professional at Contra
Cover image for Creating a Data Warehouse for a Pharmacy Chain Based in UK
Creating a Data Warehouse for a Pharmacy Chain Based in UK
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Cover image for Building a Scalable Machine Learning Model
Building a Scalable Machine Learning Model
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Cover image for Predictive Analysis for Healthcare Outcomes
Predictive Analysis for Healthcare Outcomes
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9
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Data Engineer(3)