// industries
The constraints differ — microseconds, peak weekends, multi-tenant blast radius — but the practice is the same: measure, gate, ship, repeat.
// sector · hft
Tick-to-trade pipelines, deterministic matching engines, kernel-bypass networking, market-data normalization. The latency budget is microseconds; the testing budget is a recorded production tape replayed on every commit. We design and ship both.
Tick-to-trade cut
Throughput ×
Deterministic replay
// sector · ecommerce
Catalog services, search ranking pipelines, checkout backbones, fulfillment orchestration. The platforms that move billions of dollars in the four-week window between Black Friday and the year-end freeze. We harden them for the burst and the steady-state.
Checkout p99 cut
Infra spend cut
Peak shed events
// sector · saas
Multi-tenant platforms outgrowing the architecture that got them to product-market fit. Cell-based isolation, noisy-neighbor mitigation, per-tenant rate budgets, and CI architecture that keeps shipping speed up while the codebase doubles every 18 months.
PR → prod cut
Tenant isolation
On-call pages cut
// case study
A top-20 e-commerce platform engaged us 14 weeks before peak. The previous year's Black Friday had seen 11 minutes of degraded checkout — survivable, but expensive. The target this time: zero shed events through a 72-hour window at 4× the prior year's RPS.
# load test · 4× peak→ checkout p99: 6.2s→ db saturation: cart_items.write→ cache: 71% miss on session restore
✓ cart writes: per-user shard + batch✓ session: edge KV w/ stale-while-revalidate✓ price oracle: request coalescing✓ shadow traffic gate in CI
→ p99 6.2s → 410ms · 4× peak sustained→ zero shed events / 72h window→ infra spend: -23% vs prior peak→ held throughput: $2.1B over window
The pattern catalog transfers. A consistent-hash refactor that saved a trading firm's tail latency last quarter is the same shape that stabilized a SaaS platform's tenant-isolation story this one. If your workload looks adjacent to these sectors, the diagnostic is identical.
