Nija

NIJA Multi-User Platform Architecture

Executive Summary

This document outlines the complete architecture for transforming NIJA from a single-user trading bot into a scalable, secure multi-user platform. The architecture includes three core components:

Secure API Vault System - Enterprise-grade credential management
Execution Routing Model - Intelligent trade routing and isolation
Mobile App UX Flow - Seamless user experience across devices

Design Principles

Security First

Zero-trust architecture
Encrypted credential storage
Per-user authentication and authorization
Audit logging for all critical operations
Rate limiting and abuse prevention

Scalability

Support 1,000+ concurrent users
Horizontal scaling capability
Database sharding for performance
Microservices-ready architecture

Reliability

99.9% uptime target
Graceful degradation
Circuit breakers and failovers
Comprehensive monitoring and alerting

User Experience

Sub-second API response times
Real-time trade notifications
Intuitive mobile-first interface
Minimal latency for trade execution

Current State Analysis

Existing Components (✅ Implemented)

NIJA already has a strong foundation with the following components:

Layer 1: Core Brain (PRIVATE)

Location: /core/
Purpose: Proprietary trading strategy
Status: ✅ Implemented and locked
Components:
- Trading strategy logic
- Risk management engine
- Technical indicators (RSI_9, RSI_14)
- Entry/exit decision system

Layer 2: Execution Engine (LIMITED)

Location: /execution/
Status: ✅ Partially implemented
Components:
- User permissions system (UserPermissions)
- Permission validator (PermissionValidator)
- Broker adapter framework
- Basic execution controls

Layer 3: User Interface (PUBLIC)

Location: /ui/
Status: ⚠️ Skeleton only
Components:
- Dashboard API structure
- Basic user stats retrieval

Authentication & User Management

Location: /auth/
Status: ✅ Core implemented
Components:
- Encrypted API key manager (APIKeyManager)
- User account manager (UserManager)
- Fernet-based encryption

Hard Controls

Location: /controls/
Status: ✅ Implemented
Components:
- Position size limits (2-10%)
- Daily loss tracking
- Global and per-user kill switches
- Live capital verification
- Error tracking and auto-disable

Configuration Management

Location: /config/
Status: ✅ Implemented
Components:
- User config loader
- YAML-based user profiles
- Per-broker configurations

Gaps to Address

API Vault System: Need production-grade secrets management
Execution Routing: Need intelligent routing and isolation
Mobile App: Need complete mobile UX design
Database Layer: Need persistent storage for users, trades, and analytics
API Gateway: Need rate limiting, authentication, and routing
Monitoring: Need comprehensive observability
Deployment: Need multi-tenant deployment strategy

System Architecture Overview

┌─────────────────────────────────────────────────────────────┐
│                    Mobile App (React Native)                 │
│  - iOS & Android native apps                                │
│  - Real-time WebSocket updates                              │
│  - Biometric authentication                                 │
└────────────────────┬────────────────────────────────────────┘
                     │ HTTPS/WSS
                     ▼
┌─────────────────────────────────────────────────────────────┐
│                  API Gateway (Kong/Nginx)                    │
│  - Authentication (JWT)                                      │
│  - Rate limiting (per user/tier)                            │
│  - Request routing                                          │
│  - SSL termination                                          │
└────────────────────┬────────────────────────────────────────┘
                     │
         ┌───────────┴──────────┬─────────────────────┐
         ▼                      ▼                     ▼
┌─────────────────┐   ┌──────────────────┐   ┌─────────────────┐
│  Dashboard API  │   │  Trading API     │   │  Admin API      │
│  (FastAPI)      │   │  (FastAPI)       │   │  (FastAPI)      │
│                 │   │                  │   │                 │
│  - User stats   │   │  - Trade exec    │   │  - User mgmt    │
│  - Settings     │   │  - Positions     │   │  - Monitoring   │
│  - Analytics    │   │  - Orders        │   │  - Controls     │
└────────┬────────┘   └─────────┬────────┘   └────────┬────────┘
         │                      │                      │
         └──────────────────────┼──────────────────────┘
                                │
         ┌──────────────────────┴──────────────────────┐
         │                                             │
         ▼                                             ▼
┌─────────────────────┐                    ┌─────────────────────┐
│   API Vault         │                    │  Execution Router   │
│   (HashiCorp Vault) │                    │  (Core Service)     │
│                     │                    │                     │
│  - Encrypted keys   │                    │  - Route trades     │
│  - Key rotation     │                    │  - Isolate users    │
│  - Audit logging    │                    │  - Load balance     │
│  - Policy control   │                    │  - Circuit breaker  │
└─────────────────────┘                    └──────────┬──────────┘
                                                      │
                  ┌───────────────┬──────────────────┼──────────────┐
                  │               │                  │              │
                  ▼               ▼                  ▼              ▼
         ┌──────────────┐  ┌──────────┐    ┌──────────────┐  ┌─────────┐
         │  Coinbase    │  │  Kraken  │    │   Binance    │  │  Alpaca │
         │  Executor    │  │ Executor │    │   Executor   │  │ Executor│
         └──────────────┘  └──────────┘    └──────────────┘  └─────────┘

┌─────────────────────────────────────────────────────────────┐
│                     Data Layer (PostgreSQL)                  │
│                                                              │
│  - Users & accounts          - Audit logs                   │
│  - Trades & positions        - Analytics data               │
│  - Permissions & configs     - System events                │
└─────────────────────────────────────────────────────────────┘

┌─────────────────────────────────────────────────────────────┐
│                 Monitoring & Observability                   │
│                                                              │
│  - Prometheus (metrics)      - Grafana (dashboards)         │
│  - ELK Stack (logs)          - Sentry (error tracking)      │
│  - PagerDuty (alerts)        - Datadog (APM)                │
└─────────────────────────────────────────────────────────────┘

Component Details

1. Mobile App Layer

Technology: React Native (iOS + Android)
Features:
- Biometric authentication (Face ID, Touch ID)
- Real-time position tracking
- Push notifications for trades
- Interactive charts and analytics
- Settings management
Communication: REST API + WebSockets for real-time data
Offline Mode: View-only cached data

2. API Gateway Layer

Technology: Kong or Nginx with Lua
Responsibilities:
- JWT authentication validation
- Rate limiting by user tier
- Request logging and metrics
- SSL/TLS termination
- DDoS protection
Rate Limits:
- Basic tier: 60 req/min
- Pro tier: 300 req/min
- Enterprise tier: 1000 req/min

3. API Services Layer

Technology: FastAPI (Python)
Services:
- Dashboard API: User-facing stats and settings
- Trading API: Trade execution and position management
- Admin API: Platform administration and monitoring
Features:
- Async/await for performance
- Pydantic validation
- OpenAPI documentation
- Dependency injection

4. API Vault System

See dedicated section below

5. Execution Router

See dedicated section below

6. Data Layer

Technology: PostgreSQL with TimescaleDB extension
Schema Design:
- User accounts and profiles
- Trading history and positions
- Permissions and configurations
- Audit logs
- Analytics aggregations
Performance:
- Read replicas for analytics
- Connection pooling
- Indexed queries
- Partitioning for large tables

7. Monitoring Layer

Metrics: Prometheus + Grafana
Logs: ELK Stack (Elasticsearch, Logstash, Kibana)
Errors: Sentry for exception tracking
APM: Datadog for application performance
Alerts: PagerDuty for critical incidents

Technology Stack

Backend

Language: Python 3.11+
Framework: FastAPI
Database: PostgreSQL 14+ with TimescaleDB
Cache: Redis 7+
Message Queue: RabbitMQ or Kafka
Secrets: HashiCorp Vault

Frontend (Mobile)

Framework: React Native 0.72+
State Management: Redux Toolkit
Navigation: React Navigation
Charts: Recharts / Victory Native
Real-time: Socket.io client

Infrastructure

Orchestration: Kubernetes (K8s)
CI/CD: GitHub Actions
Cloud: AWS / GCP / Railway
Monitoring: Prometheus, Grafana, ELK
Load Balancer: Nginx / Kong

Security

Encryption: AES-256-GCM
Secrets: HashiCorp Vault
Auth: JWT with refresh tokens
API Security: OAuth2 / API keys
Network: TLS 1.3, VPN for admin access

Deployment Strategy

Development Environment

Docker Compose for local development
Mock API vault for testing
In-memory Redis and PostgreSQL
Hot reload for rapid iteration

Staging Environment

Kubernetes cluster (3 nodes)
Real integrations with test accounts
Production-like configuration
Load testing and QA

Production Environment

Kubernetes cluster (5+ nodes)
Multi-AZ deployment
Auto-scaling (HPA)
Blue-green deployment
99.9% uptime SLA

Security Considerations

Data Protection

At Rest: AES-256 encryption for all sensitive data
In Transit: TLS 1.3 for all communications
Secrets: HashiCorp Vault with auto-rotation
PII: GDPR-compliant data handling

Authentication & Authorization

Multi-factor: SMS/Email OTP, TOTP (Authenticator apps)
Session Management: JWT with short expiry (15 min)
Refresh Tokens: Secure, HTTP-only cookies
Password Policy: Minimum 12 chars, complexity requirements
Brute Force: Rate limiting + account lockout

API Security

Rate Limiting: Per-user and per-IP limits
Input Validation: Strict schema validation
SQL Injection: Parameterized queries only
XSS Protection: Content Security Policy
CSRF Protection: Token-based validation

Compliance

SOC 2: Compliance-ready architecture
GDPR: Data privacy and right to deletion
PCI DSS: If handling payment data
Audit Logs: Immutable audit trail

Scalability Plan

Horizontal Scaling

API Services: Auto-scale based on CPU/memory
Execution Workers: Scale based on queue depth
Database: Read replicas for queries
Cache: Redis cluster for high throughput

Database Optimization

Partitioning: Time-series data by date
Indexing: Strategic indexes on query patterns
Connection Pooling: PgBouncer for connection reuse
Query Optimization: EXPLAIN ANALYZE for slow queries

Caching Strategy

Redis: User sessions, permissions, rate limits
CDN: Static assets for mobile app
Application Cache: In-memory cache for hot data
Cache Invalidation: Event-driven updates

Monitoring & Alerting

Key Metrics

System: CPU, memory, disk, network
Application: Request rate, latency, error rate
Business: Trades executed, active users, PnL
Security: Failed logins, API abuse, anomalies

Alert Thresholds

Critical: System down, data loss, security breach
High: High error rate, performance degradation
Medium: Unusual patterns, approaching limits
Low: Informational, trends

SLA Targets

API Availability: 99.9% (8.76 hours/year downtime)
API Latency: p50 < 100ms, p99 < 500ms
Trade Execution: 95% within 5 seconds
Data Accuracy: 100% (zero tolerance)

Disaster Recovery

Backup Strategy

Database: Daily full backup, hourly incrementals
Secrets: Vault snapshots to encrypted S3
Code: Git with protected branches
Configuration: Infrastructure as Code (Terraform)

Recovery Procedures

RTO: Recovery Time Objective = 1 hour
RPO: Recovery Point Objective = 15 minutes
Runbooks: Documented recovery procedures
Drills: Quarterly DR testing

Cost Optimization

Infrastructure Costs (Monthly Estimates)

Kubernetes Cluster: $200-500
Database (PostgreSQL): $100-300
Redis Cache: $50-100
Vault: $100 (self-hosted) or $300 (cloud)
Monitoring: $100-200
Total: $550-1,500/month for 100-1000 users

Cost Reduction Strategies

Auto-scaling to reduce idle capacity
Spot instances for non-critical workloads
Reserved instances for predictable load
Object storage for cold data
Optimize database queries

Migration Path

Phase 1: Foundation (Weeks 1-2)

Set up PostgreSQL database
Deploy HashiCorp Vault
Implement API gateway
Create basic FastAPI services

Phase 2: API Development (Weeks 3-4)

Dashboard API endpoints
Trading API endpoints
Admin API endpoints
User migration scripts

Phase 3: Mobile App (Weeks 5-8)

React Native app setup
Authentication flow
Dashboard screens
Trading screens
Settings screens

Phase 4: Integration (Weeks 9-10)

Connect mobile app to APIs
Implement WebSocket updates
End-to-end testing
Performance optimization

Phase 5: Launch (Weeks 11-12)

Beta testing with select users
Fix bugs and issues
Production deployment
Gradual rollout

Success Metrics

Technical KPIs

API uptime: 99.9%
API latency: p99 < 500ms
Error rate: < 0.1%
Trade execution success: > 99%

Business KPIs

User acquisition: 100 users in month 1
User retention: > 80% month-over-month
Daily active users: > 60% of total
User satisfaction: NPS > 50

Security KPIs

Zero security breaches
Zero data leaks
100% audit log coverage
< 1 hour incident response time

Next Steps

Review this architecture with stakeholders
Approve technology choices and vendors
Set up development environment (Week 1)
Begin implementation following migration path
Iterate and refine based on feedback

Document Version: 1.0 Last Updated: January 27, 2026 Status: ✅ Comprehensive Design Complete Next Review: Before Phase 1 implementation