Event Ticketing & NFT Backend Development
Budget: ₹12,500 – ₹37,500 INR
Responsibilities
API Design & CRUD Endpoints
For each core entity, design and implement full CRUD (Create, Read, Update, Delete) operations, plus any specialized actions:
Events:
Create, read (single & list with filtering/pagination), update, delete events.
Manage event details: name, description, date/time, venue, organizer, category, tags.
Support drafts vs. published states, visibility controls (public/private).
Venues/Locations:
CRUD venues or location entries (address, capacity, seating layout if applicable).
Associate events with venues or support virtual events.
Organizers/Hosts:
CRUD organizer profiles (name, bio, logo, contact info).
Permissions: manage which users/accounts can create or manage events for an organizer.
Users/Accounts:
CRUD user profiles (registration, profile updates, deletion).
Authentication & authorization: sign-up, login/logout, password reset, OAuth if needed.
Role management: attendee, organizer-admin, super-admin.
Wallet linking: associate blockchain wallet addresses with user accounts.
Tickets:
CRUD ticket definitions/templates (e.g., ticket types: general admission, VIP, early bird).
Inventory management: total supply, seat assignments or quotas.
Pricing models: fixed price, tiered pricing, dynamic pricing rules.
Specialized actions: reserve, hold, release holds.
Orders & Purchases:
Create/retrieve orders: initiate purchase, payment intent creation, status tracking (pending, paid, failed, refunded).
Read/list orders for user/admin, update status (e.g., marking manual refunds).
Delete or cancel orders within allowed windows.
Idempotency handling for retrying payment or blockchain operations.
NFT Minting Workflows:
Prepare metadata records for each ticket instance (unique token data, seat info, event details).
Generate/upload metadata & assets (images, JSON) to IPFS or chosen storage.
Trigger on-chain minting: create unsigned transactions or server-relayed transactions; handle confirmations.
Read/Update status of minting jobs: pending, success, failed, retry logic.
Burn or invalidate NFTs on cancellations/refunds if appropriate.
Gas Estimation & Pricing:
Endpoint to fetch current gas/base fee recommendations for Ethereum and Polygon networks.
CRUD or configuration for caching policies or thresholds (e.g., acceptable gas price caps).
Monitor historical gas usage patterns and expose analytics endpoints.
Ticket Validation & Check-in:
Endpoint to verify ticket authenticity/ownership: input could be token ID, QR code payload, wallet address.
Real-time validation at gates: ensure low latency; optionally pre-cache valid token lists for events.
Support off-chain proofs or Merkle-tree approaches to reduce on-chain calls.
CRUD for validation sessions or logs: record check-in attempts, statuses (used, invalid, duplicate).
Secondary Marketplace / Transfers (optional/advanced):
Endpoints for listing tickets for resale, browsing listings, purchase/resale workflows.
Transfer NFT ownership off-chain/on-chain with appropriate approval flows.
CRUD for resale listings: create, read/list, update (price), delete/cancel listing.
Payments & Refunds:
Integrate with payment gateways (e.g., Stripe) via CRUD on payment intents, webhooks to update order statuses.
Endpoint to issue refunds and tie to burn or invalidate NFTs as needed.
Manage refunds policy configurations: windows, fees, automatic vs manual.
Metadata Management:
CRUD metadata templates or global settings (e.g., default image templates, attribute presets).
Endpoints to preview generated ticket visuals (with event info, seat, QR code).
Manage storage lifecycle: pinning to IPFS, CDN caching.
Notifications & Communication:
Endpoints or background jobs to send emails/SMS/webhooks: purchase confirmations, reminders, event updates, check-in confirmations.
CRUD for notification templates and schedules.
Webhook endpoints for third-party integrations (e.g., Slack alerts, CRM).
Search, Filtering & Pagination:
Implement search endpoints for events, tickets, orders, users: support filters (date range, category, status), sorting, pagination.
Full-text search considerations (e.g., ElasticSearch or database-supported search).
Reporting & Analytics:
Endpoints to retrieve metrics: ticket sales over time, revenue reports, attendance statistics, gas usage analytics.
CRUD for custom report configurations or scheduled report jobs.
Export endpoints: CSV/JSON exports for external analysis.
Admin & Management Tools:
CRUD for admin-managed settings: global platform configurations (fee percentages, supported chains, whitelists).
Role-based access control: endpoints to manage user roles and permissions.
System health/status endpoints for monitoring.
Integrations & Webhooks:
CRUD for registering third-party webhooks (e.g., notify external systems on purchase, mint events).
Endpoints to receive external webhooks (e.g., payment gateway events) and process them.
Cache & Off-chain Indexing:
CRUD or configuration for caching strategies (Redis) for frequent reads: gas prices, event ticket lists, validation data.
Integrate with indexing services (e.g., The Graph or custom indexers) to speed up on-chain data retrieval.
Security & Compliance:
Input validation, sanitization for all endpoints.
Rate limiting/throttling: per-IP or per-user to protect public endpoints.
CRUD for allowed origins or API keys if exposing partner APIs.
Audit logs: record key actions (ticket mint, transfer, refund, validation) with immutable logs.
Data protection: secure storage of user data, encryption where needed.
Testing & QA:
CRUD or configuration for test environments: switch endpoints between testnets (e.g., Ropsten/Mumbai) and mainnets.
Endpoints or scripts to simulate bulk operations for load testing (e.g., high-frequency purchases).
DevOps & Deployment:
Infrastructure-as-code endpoints or scripts (though primarily external) to support Docker deployments, Kubernetes manifests.
Health-check endpoints for all services.
CRUD for feature flags or environment-based configurations.
API Documentation:
Maintain OpenAPI/Swagger definitions covering every endpoint, request/response schema, error codes.
Versioning strategy: CRUD for API version metadata; support multiple API versions coexisting.
Localization & Internationalization (if applicable):
CRUD for locale-specific content: event descriptions, notification templates.
Endpoints to fetch supported locales or formats.
Accessibility & Performance:
Ensure endpoints respond within SLAs; optimize database queries, use indexes.
Bulk/batch endpoints (e.g., batch validate multiple tickets).
CRUD for batch job statuses and logs.
Backup & Recovery:
Endpoints or background jobs to trigger backups of critical data (though actual backup storage is infra).
CRUD for recovery job configurations or status monitoring.
Blockchain & Web3 Integration
Integrate with Ethereum/Polygon via ethers.js or web3.js.
CRUD for smart contract addresses and ABI configurations per environment.
Manage wallet operations: prepare unsigned transactions, relay signed transactions, handle nonce management.
Monitor on-chain events: listen to mint, transfer, burn events and sync to off-chain database with CRUD operations for event logs.
Provide endpoints for clients to fetch transaction status or historical on-chain data.
Error Handling & Observability
Standardize error responses: consistent error codes and messages for CRUD operations.
Logging endpoints or middleware configurations for structured logging (e.g., correlation IDs).
Expose metrics endpoints (e.g., Prometheus-compatible) to track request rates, latencies, error rates.
Scalability & High Availability
Design stateless services where possible; CRUD operations should support horizontal scaling.
Endpoint optimizations for high-concurrency scenarios (e.g., ticket drops): rate limits, queueing, optimistic locking for inventory.
CRUD or configuration for feature toggles (e.g., enable/disable certain flows during peak).
Data Modeling & Database Design
Design schemas for all entities: events, venues, users, tickets, orders, NFT metadata, validation logs, notifications, analytics data.
CRUD via ORM/ODM (e.g., Prisma/TypeORM or Mongoose).
Index strategies for efficient reads (search, filtering), relationships (one-to-many, many-to-many).
Collaboration & Documentation
Write clear README and setup guides covering environment variables (CRUD-configurable), deployment steps, testnet/mainnet switching.
Document data models and entity relationships.
Collaborate with frontend, smart contract teams: ensure endpoints meet UI needs; provide mocks or stubs for frontend development.
Additional Advanced Features (Optional but Valuable)
Promotions & Discounts: CRUD for promo codes, discount rules, bulk issuance.
Dynamic Pricing: endpoints or background jobs to adjust pricing based on demand or time.
Loyalty & Rewards: manage user reward points or perks, CRUD for reward rules.
Analytics Dashboard Backend: endpoints to feed real-time dashboards for organizers (sales trends, audience demographics if collected).
Multi-chain Support: CRUD for chain configurations, ability to issue NFTs on multiple networks per event.
Meta-transactions / Gasless Flows: endpoints to facilitate relayer logic, manage credits, and allow users to mint without holding native tokens.
Integration with Identity/AML/KYC: CRUD workflows for verifying organizer identities if required by jurisdiction.
Offline Validation Tools: endpoints to generate signed proofs or QR code payloads that can be validated without connectivity.
SDK or Client Library: optionally design and publish a Node.js or TypeScript SDK that wraps the CRUD endpoints for easier integration by partners.
Type the words: NFTDEVELOPERSTARTER so that i know that you have read this whole post.
API Design & CRUD Endpoints
For each core entity, design and implement full CRUD (Create, Read, Update, Delete) operations, plus any specialized actions:
Events:
Create, read (single & list with filtering/pagination), update, delete events.
Manage event details: name, description, date/time, venue, organizer, category, tags.
Support drafts vs. published states, visibility controls (public/private).
Venues/Locations:
CRUD venues or location entries (address, capacity, seating layout if applicable).
Associate events with venues or support virtual events.
Organizers/Hosts:
CRUD organizer profiles (name, bio, logo, contact info).
Permissions: manage which users/accounts can create or manage events for an organizer.
Users/Accounts:
CRUD user profiles (registration, profile updates, deletion).
Authentication & authorization: sign-up, login/logout, password reset, OAuth if needed.
Role management: attendee, organizer-admin, super-admin.
Wallet linking: associate blockchain wallet addresses with user accounts.
Tickets:
CRUD ticket definitions/templates (e.g., ticket types: general admission, VIP, early bird).
Inventory management: total supply, seat assignments or quotas.
Pricing models: fixed price, tiered pricing, dynamic pricing rules.
Specialized actions: reserve, hold, release holds.
Orders & Purchases:
Create/retrieve orders: initiate purchase, payment intent creation, status tracking (pending, paid, failed, refunded).
Read/list orders for user/admin, update status (e.g., marking manual refunds).
Delete or cancel orders within allowed windows.
Idempotency handling for retrying payment or blockchain operations.
NFT Minting Workflows:
Prepare metadata records for each ticket instance (unique token data, seat info, event details).
Generate/upload metadata & assets (images, JSON) to IPFS or chosen storage.
Trigger on-chain minting: create unsigned transactions or server-relayed transactions; handle confirmations.
Read/Update status of minting jobs: pending, success, failed, retry logic.
Burn or invalidate NFTs on cancellations/refunds if appropriate.
Gas Estimation & Pricing:
Endpoint to fetch current gas/base fee recommendations for Ethereum and Polygon networks.
CRUD or configuration for caching policies or thresholds (e.g., acceptable gas price caps).
Monitor historical gas usage patterns and expose analytics endpoints.
Ticket Validation & Check-in:
Endpoint to verify ticket authenticity/ownership: input could be token ID, QR code payload, wallet address.
Real-time validation at gates: ensure low latency; optionally pre-cache valid token lists for events.
Support off-chain proofs or Merkle-tree approaches to reduce on-chain calls.
CRUD for validation sessions or logs: record check-in attempts, statuses (used, invalid, duplicate).
Secondary Marketplace / Transfers (optional/advanced):
Endpoints for listing tickets for resale, browsing listings, purchase/resale workflows.
Transfer NFT ownership off-chain/on-chain with appropriate approval flows.
CRUD for resale listings: create, read/list, update (price), delete/cancel listing.
Payments & Refunds:
Integrate with payment gateways (e.g., Stripe) via CRUD on payment intents, webhooks to update order statuses.
Endpoint to issue refunds and tie to burn or invalidate NFTs as needed.
Manage refunds policy configurations: windows, fees, automatic vs manual.
Metadata Management:
CRUD metadata templates or global settings (e.g., default image templates, attribute presets).
Endpoints to preview generated ticket visuals (with event info, seat, QR code).
Manage storage lifecycle: pinning to IPFS, CDN caching.
Notifications & Communication:
Endpoints or background jobs to send emails/SMS/webhooks: purchase confirmations, reminders, event updates, check-in confirmations.
CRUD for notification templates and schedules.
Webhook endpoints for third-party integrations (e.g., Slack alerts, CRM).
Search, Filtering & Pagination:
Implement search endpoints for events, tickets, orders, users: support filters (date range, category, status), sorting, pagination.
Full-text search considerations (e.g., ElasticSearch or database-supported search).
Reporting & Analytics:
Endpoints to retrieve metrics: ticket sales over time, revenue reports, attendance statistics, gas usage analytics.
CRUD for custom report configurations or scheduled report jobs.
Export endpoints: CSV/JSON exports for external analysis.
Admin & Management Tools:
CRUD for admin-managed settings: global platform configurations (fee percentages, supported chains, whitelists).
Role-based access control: endpoints to manage user roles and permissions.
System health/status endpoints for monitoring.
Integrations & Webhooks:
CRUD for registering third-party webhooks (e.g., notify external systems on purchase, mint events).
Endpoints to receive external webhooks (e.g., payment gateway events) and process them.
Cache & Off-chain Indexing:
CRUD or configuration for caching strategies (Redis) for frequent reads: gas prices, event ticket lists, validation data.
Integrate with indexing services (e.g., The Graph or custom indexers) to speed up on-chain data retrieval.
Security & Compliance:
Input validation, sanitization for all endpoints.
Rate limiting/throttling: per-IP or per-user to protect public endpoints.
CRUD for allowed origins or API keys if exposing partner APIs.
Audit logs: record key actions (ticket mint, transfer, refund, validation) with immutable logs.
Data protection: secure storage of user data, encryption where needed.
Testing & QA:
CRUD or configuration for test environments: switch endpoints between testnets (e.g., Ropsten/Mumbai) and mainnets.
Endpoints or scripts to simulate bulk operations for load testing (e.g., high-frequency purchases).
DevOps & Deployment:
Infrastructure-as-code endpoints or scripts (though primarily external) to support Docker deployments, Kubernetes manifests.
Health-check endpoints for all services.
CRUD for feature flags or environment-based configurations.
API Documentation:
Maintain OpenAPI/Swagger definitions covering every endpoint, request/response schema, error codes.
Versioning strategy: CRUD for API version metadata; support multiple API versions coexisting.
Localization & Internationalization (if applicable):
CRUD for locale-specific content: event descriptions, notification templates.
Endpoints to fetch supported locales or formats.
Accessibility & Performance:
Ensure endpoints respond within SLAs; optimize database queries, use indexes.
Bulk/batch endpoints (e.g., batch validate multiple tickets).
CRUD for batch job statuses and logs.
Backup & Recovery:
Endpoints or background jobs to trigger backups of critical data (though actual backup storage is infra).
CRUD for recovery job configurations or status monitoring.
Blockchain & Web3 Integration
Integrate with Ethereum/Polygon via ethers.js or web3.js.
CRUD for smart contract addresses and ABI configurations per environment.
Manage wallet operations: prepare unsigned transactions, relay signed transactions, handle nonce management.
Monitor on-chain events: listen to mint, transfer, burn events and sync to off-chain database with CRUD operations for event logs.
Provide endpoints for clients to fetch transaction status or historical on-chain data.
Error Handling & Observability
Standardize error responses: consistent error codes and messages for CRUD operations.
Logging endpoints or middleware configurations for structured logging (e.g., correlation IDs).
Expose metrics endpoints (e.g., Prometheus-compatible) to track request rates, latencies, error rates.
Scalability & High Availability
Design stateless services where possible; CRUD operations should support horizontal scaling.
Endpoint optimizations for high-concurrency scenarios (e.g., ticket drops): rate limits, queueing, optimistic locking for inventory.
CRUD or configuration for feature toggles (e.g., enable/disable certain flows during peak).
Data Modeling & Database Design
Design schemas for all entities: events, venues, users, tickets, orders, NFT metadata, validation logs, notifications, analytics data.
CRUD via ORM/ODM (e.g., Prisma/TypeORM or Mongoose).
Index strategies for efficient reads (search, filtering), relationships (one-to-many, many-to-many).
Collaboration & Documentation
Write clear README and setup guides covering environment variables (CRUD-configurable), deployment steps, testnet/mainnet switching.
Document data models and entity relationships.
Collaborate with frontend, smart contract teams: ensure endpoints meet UI needs; provide mocks or stubs for frontend development.
Additional Advanced Features (Optional but Valuable)
Promotions & Discounts: CRUD for promo codes, discount rules, bulk issuance.
Dynamic Pricing: endpoints or background jobs to adjust pricing based on demand or time.
Loyalty & Rewards: manage user reward points or perks, CRUD for reward rules.
Analytics Dashboard Backend: endpoints to feed real-time dashboards for organizers (sales trends, audience demographics if collected).
Multi-chain Support: CRUD for chain configurations, ability to issue NFTs on multiple networks per event.
Meta-transactions / Gasless Flows: endpoints to facilitate relayer logic, manage credits, and allow users to mint without holding native tokens.
Integration with Identity/AML/KYC: CRUD workflows for verifying organizer identities if required by jurisdiction.
Offline Validation Tools: endpoints to generate signed proofs or QR code payloads that can be validated without connectivity.
SDK or Client Library: optionally design and publish a Node.js or TypeScript SDK that wraps the CRUD endpoints for easier integration by partners.
Type the words: NFTDEVELOPERSTARTER so that i know that you have read this whole post.