Migrating a high-traffic ad platform from JSP servlets to Go
The situation
The client ran a supply-side platform (SSP) that integrated with multiple demand-side platforms (DSPs) over real-time bidding APIs. The existing JSP servlet stack was accurate but couldn't handle the request volume without stacking on more and more servers.
What we were solving for
A single VPS running the JSP servlet implementation topped out around 50 requests per second under real ad-auction load, meaning the client was scaling by throwing hardware at the problem rather than fixing the bottleneck — expensive, and it still couldn't keep up during traffic spikes.
What we built
We re-implemented the request-handling and DSP integration layer in Go, redesigning the concurrency model around the platform's actual traffic pattern instead of porting the Java logic line-for-line. We validated the rewrite with ab and JMeter load testing before it went anywhere near production traffic.
The throughput difference, live
Same VPS, rewritten in Go
What the migration actually changed
Before
JSP Servlets · single VPS
0 req/s
Saturated — adding servers just to keep up
After
Go · same single VPS
0 req/s
Headroom — same box, no extra hardware
Numbers reflect ab and JMeter load testing on the same single-VPS deployment, not a marketing estimate.
A closer look
“They rebuilt our supply-side integration on Go and gave us a straight answer on throughput before we committed to anything. It held up under real load, not just the benchmark.”
Results
~50 req/s → ~2,000 req/s
Throughput, single VPS
ab + JMeter load testing
Validation method
Phased, zero-downtime cutover
Migration approach
Technologies
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