Go Overseas

The Situation

Go Overseas is an established platform helping people find international opportunities—from study abroad programs to volunteer positions. With thousands of daily visitors and years of SEO equity, any disruption could have significant business impact.

Their existing homepage and search functionality were built on aging technology. Performance was declining, and the codebase was becoming increasingly difficult to maintain and extend. A modernization was overdue, but the stakes were high.

The Constraints

• Zero downtime: The site needed to stay live throughout the entire rebuild
• SEO preservation: URL structures and metadata needed careful handling
• Gradual rollout: Changes needed to be testable and reversible
• Existing team: Solution needed to integrate with their development workflow

The Approach

We designed a migration strategy that prioritized safety and reversibility at every step.

Phase 1: Foundation

• Set up feature flag infrastructure for controlled rollouts
• Established parallel deployment pipeline
• Created comprehensive test coverage for existing functionality

Phase 2: Search Rebuild

• Designed new Elasticsearch schema optimized for their query patterns
• Built new search API with backward-compatible endpoints
• Implemented gradual traffic shifting between old and new systems

Phase 3: Frontend Migration

• Rebuilt homepage components in React with TypeScript
• Maintained visual parity while improving performance
• Progressive rollout by user segment and geography

Phase 4: Cutover & Cleanup

• Monitored key metrics during full rollout
• Deprecated legacy code paths
• Documentation and knowledge transfer

What We Built

• Modern React frontend with TypeScript for type safety
• Elasticsearch-powered search with improved relevance
• Feature flag system for safe deployments
• Performance monitoring and alerting

The Tech Decisions

Feature flags over big-bang migration: Every major change was gated behind a feature flag. This let us test in production with small percentages of traffic before full rollout—and instantly revert if anything looked wrong.

Elasticsearch optimization: Rather than just migrating the existing search logic, we redesigned the index structure based on actual user query patterns. This improved both relevance and performance.

TypeScript migration: We didn't try to migrate everything at once. New code was written in TypeScript, and existing code was migrated incrementally as we touched it. This kept the project moving forward without getting bogged down in a full rewrite.

Results

The migration completed on schedule with zero user-facing downtime. More importantly, the new infrastructure set Go Overseas up for future feature development—something that had been increasingly difficult on the old stack.

Search performance improved noticeably, and the team could now iterate on the homepage without fear of breaking existing functionality.