API Gateway
Auth, authorization, rate limiting, and request routing across the cluster.
Node.jsTypeScriptExpressgRPC
GitHub →Projects / PropSpaceX
Systems
PropSpaceX
A microservice-based real estate management platform combining Web2 and Web3. Decentralized ownership verification via Ethereum smart contracts, hybrid email/password and wallet auth, plus web and mobile clients over a gRPC service cluster.
01 Walkthrough
One short demo and two screens from the product.
02 Stack layers
Clients
React webReact Native mobile
Services
GatewayUserPropertyMediaMailPayments
Data & chain
MongoDBPostgreSQLEthereumRabbitMQ
03 Architecture
REQUESTPOST /v1/properties/verifytracing
Gateway handles auth and rate limits, verifies the user, then routes over gRPC to property and payment services. Mail runs async via RabbitMQ.
- Web + mobile clients over a gRPC microservice backend
- Hybrid email/password and wallet authentication
- Ethereum ownership verification and multi-provider payments
04 Services
User Service
Hybrid email/password and wallet login, device trust, and audit logging.
JWTPostgreSQLWallet AuthgRPC
GitHub →Property Service
Property lifecycle with geospatial search and Ethereum ownership verification.
MongoDBEthereumgRPCWeb3
GitHub →Media Service
Chunked uploads, Sharp optimization, S3/Cloudinary abstraction.
AWS S3CloudinarySharpgRPC
GitHub →Mail Service
RabbitMQ jobs with retries, DLQ, and Nodemailer SMTP delivery.
RabbitMQNodemailergRPC
GitHub →Payment Service
Stripe, Paystack, and Flutterwave with webhooks and reconciliation.
NestJSStripePaystackFlutterwave
GitHub →05 Engineering challenges
01
Hybrid authentication
One identity model backing email/password and Ethereum wallet signature verification.
02
Service mesh complexity
gRPC routing, rate limiting, and correlation IDs across a multi-service real-estate cluster.
03
On-chain ownership
Smart-contract integration proves ownership on Ethereum and records tokenized transfers.
04
Multi-provider payments
Stripe, Paystack, and Flutterwave behind one API with idempotent webhooks and reconciliation.
06 Trade-offs & decisions
gRPCvsREST everywhere
Binary protocol and streaming make inter-service calls cheaper than JSON over HTTP.
MicroservicesvsMonolith
Independent deploy and scaling for media, payments, and property under different load profiles.
EthereumvsDB-only records
Tokenized real estate needs an ownership record no single operator can rewrite.