Sprint 24 - November 2025

Migrate REST endpoints to GraphQL. Design schema for User, Profile, Settings queries and mutations. Implement DataLoader for N+1 query optimization. Add field-level authorization. Write integration tests. Expected complexity: 13 story points. Dependencies: None. Acceptance criteria: 1) All REST user endpoints have GraphQL equivalents 2) Response time <100ms for single user query 3) Batch queries resolve in <200ms 4) 90% test coverage 5) API documentation in GraphQL Playground. Tech stack: Apollo Server, TypeScript, Jest.

Implement GraphQL API for user service

Implement Google Docs-style collaborative editing using Yjs CRDT library and WebSocket. Features: 1) Multi-cursor support 2) User presence indicators 3) Real-time sync <100ms latency 4) Offline editing with conflict resolution 5) Version history 6) Comments and mentions. Tech: Yjs, y-websocket, Monaco Editor or Lexical. Handle: network disconnections, reconnection logic, large documents (10K+ lines). Complexity: 21 story points. Testing: manual testing with 10+ concurrent users, automated tests for CRDT operations. Mobile responsive design required.

Build real-time collaborative text editor component

Build internal feature flag service to enable safe deployments and A/B testing. Requirements: 1) Percentage-based rollouts 2) User segment targeting 3) Kill switch for instant disable 4) Real-time flag updates without deployment 5) Admin UI for non-technical users 6) Analytics integration. Tech stack: LaunchDarkly SDK or custom solution with Redis. Features: flag overrides for testing, audit log of changes, environment-specific flags (dev/staging/prod). Include React hooks for frontend flags and middleware for backend. Document rollout strategy and testing procedures. 13 story points.

Implement feature flags system with gradual rollout

<p>Performance profiling shows 47 endpoints with N+1 query issues causing 2-5 second response times. Specific issues: 1) User-&gt;Posts-&gt;Comments loading individually 2) Dashboard aggregations running separate queries 3) Missing indexes on foreign keys. Solution: implement DataLoader pattern, add strategic indexes, use SELECT with joins instead of multiple queries. Target: reduce P95 latency from 3.2s to &lt;500ms. Affected endpoints: /api/feed, /api/user/dashboard, /api/search. Priority: HIGH - enterprise customers complaining. Requires DB migration testing in staging. 5 story points.</p>

Optimize database queries causing N+1 problems

Current auth only supports Auth0. Need to add support for Firebase Auth, AWS Cognito, and custom JWT. Create adapter pattern for different providers. Implement token validation, refresh logic, and user extraction for each provider. Update existing endpoints to use new middleware. Migration plan for existing Auth0 users. Estimated: 8 story points. Prerequisites: Security team review. Deliverables: 1) Provider abstraction layer 2) Config-based provider selection 3) Zero downtime migration 4) Unit tests for each provider 5) Performance benchmarks showing <10ms auth overhead.

Refactor authentication middleware to support multiple JWT providers

Integrate Sentry for error tracking across frontend and backend. Setup: 1) Source maps for meaningful stack traces 2) User context (ID, email, plan) 3) Breadcrumbs for user actions leading to error 4) Performance monitoring 5) Alert rules for critical errors 6) Integration with Slack/PagerDuty. Configure: error sampling (100% for critical, 10% for info), release tracking, environment tagging. Create custom error boundary components in React. Add structured logging with Winston/Pino. Setup dashboards for error trends. Required before production launch. 5 story points.

Add comprehensive error tracking and monitoring

Add Redis caching to reduce database load and improve response times. Cache candidates: 1) User sessions (current: DB, target: Redis) 2) API response caching (user profiles, public data) 3) Rate limiting counters 4) Real-time presence data 5) Job queues. Implement: cache-aside pattern, TTL strategy, cache invalidation on updates, cache warming for hot data. Handle: cache stampede, thundering herd with locking. Setup Redis cluster for high availability. Monitor: hit rate (target >80%), memory usage, eviction rate. Performance goal: reduce DB queries by 60%. 8 story points. Requires infrastructure provisioning.

Implement Redis caching layer for frequently accessed data

Implement end-to-end testing using Playwright or Cypress for critical paths: 1) User registration and onboarding 2) Create/edit/delete projects 3) Team collaboration workflows 4) Payment and subscription 5) Data export. Tests must: run in CI/CD pipeline, generate screenshots on failure, support parallel execution, test across Chrome/Firefox/Safari. Include visual regression testing with Percy. Setup test data seeding and cleanup. Document test writing guidelines. Create reusable page object models. Target: 80% critical path coverage. Est: 13 story points. Blockers: staging environment must match production.

Write E2E tests for critical user flows

Current Jenkins setup is slow (15 min builds) and hard to maintain. Migrate to GitHub Actions for faster builds and better DX. Requirements: 1) Parallel job execution 2) Docker layer caching 3) Separate workflows for frontend/backend 4) Preview deployments for PRs 5) Automated testing and linting 6) Deployment to staging/production 7) Rollback capabilities. Setup: matrix builds for multiple Node versions, dependency caching, secrets management. Target build time: <5 minutes. Include: branch protection rules, required status checks, automated releases. Document workflow for team. 8 story points. Migration plan with rollback strategy.

Migrate CI/CD pipeline from Jenkins to GitHub Actions

Production database backup strategy required before launch. Requirements: 1) Automated daily full backups 2) Point-in-time recovery capability 3) Backup to multiple regions 4) Encrypted backups 5) Automated restore testing 6) Retention policy (30 days full, 90 days incremental). Implement: PostgreSQL WAL archiving, AWS RDS automated backups, S3 lifecycle policies. Document: recovery procedures, RPO (1 hour) and RTO (4 hours) targets, disaster recovery runbook. Test: quarterly DR drills. Monitor: backup completion, storage costs, backup integrity. Setup alerts for failed backups. 8 story points. Critical for SOC 2 compliance.

Design and implement database backup and recovery strategy

Replace polling with WebSocket for real-time updates. Implement: 1) WebSocket server using Socket.io or native WS 2) Authentication via JWT in handshake 3) Room-based messaging for users/teams 4) Automatic reconnection with exponential backoff 5) Heartbeat/ping-pong for connection health 6) Message queuing during disconnection 7) Horizontal scaling with Redis adapter. Events to push: new messages, mentions, status changes, system alerts. Handle: load balancing sticky sessions, connection limits per user (3 devices max). Monitor: active connections, message throughput, reconnection rate. Frontend: React context for WebSocket state. 13 story points.

Add WebSocket support for real-time notifications

Implement comprehensive monitoring stack. Collect metrics: 1) Application: request rate, response time, error rate 2) Infrastructure: CPU, memory, disk, network 3) Business: signups, active users, revenue 4) Custom: feature usage, API endpoints performance. Setup: Prometheus for metrics collection, Grafana for visualization, AlertManager for notifications. Create dashboards: system health, application performance, business metrics, SLO tracking. Configure alerts: critical (PagerDuty), warning (Slack), info (email). Define SLIs/SLOs: 99.9% uptime, P95 <500ms. Include on-call runbooks. 8 story points.

Setup monitoring and alerting with Grafana + Prometheus

Prevent API abuse with intelligent rate limiting. Strategy: 1) Authenticated users: 1000 req/hour, 10000 req/day 2) Anonymous users: 100 req/hour 3) Premium users: 5000 req/hour 4) Webhook endpoints: 100 req/min. Implement using Redis with sliding window algorithm. Features: 1) Return remaining quota in headers 2) Exponential backoff suggestions 3) Whitelist IPs (internal services) 4) Monitoring and alerts for limit breaches 5) Admin override capability. Handle: distributed rate limiting across multiple servers, clock synchronization. Add metrics to track rate limit hits. Test with load testing tools. 5 story points.

Implement API rate limiting per user and IP

Current monolith is 150K LOC and becoming unmaintainable. Phase 1: extract into 4 microservices: 1) User Service (auth, profiles) 2) Content Service (posts, comments) 3) Notification Service (emails, push) 4) Analytics Service (metrics, reporting). Challenges: shared database, service communication, distributed transactions, deployment complexity. Approach: strangler fig pattern - gradually extract services. Tech: Docker, Kubernetes, gRPC for inter-service communication, API Gateway for routing. Implement: circuit breakers, retry logic, timeout handling, distributed tracing. Est: 34 story points over 2 sprints. Requires architecture review and team training.

Refactor monolithic API into microservices architecture

Add social login options to reduce friction in signup. Implement OAuth2 flow for: Google, GitHub, Microsoft, Apple. Features: 1) Account linking (link social to existing email) 2) Profile data import (name, avatar) 3) Permission scope management 4) Token refresh handling 5) Account unlinking. Security: validate state parameter, secure token storage, handle scope changes. Edge cases: user changes email on provider, provider account deleted, privacy mode browsers. UI: social buttons on login/signup pages, settings page for connected accounts. Track: conversion rate improvement, most used provider. Backend: Passport.js or custom implementation. 8 story points.

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Sprint 24 - November 2025

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