Scaling globalheadless commerceunder extreme retail surges.
Multi-Region Headless Cart & Distributed Inventory Reservation
Flash sales bringing down relational databases. Cart abandonment at 68%. Stale inventory reads.
During seasonal product drops, Nexa's monolithic e-commerce stack experienced severe row locking on inventory tables. Thousands of concurrent buyers attempting to purchase limited-edition footwear caused database connection pools to max out within 45 seconds.
Shoppers across Europe and Asia suffered checkout latency spikes upwards of 4,000ms, driving catastrophic cart abandonment rates and generating angry support backlogs.
Nexa engaged Codedway to decompose their checkout flow into an edge-native, multi-region headless API topology capable of absorbing 180,000 transactions per minute without locking contention.
Decoupled inventory reservation via distributed in-memory consensus.
Decomposition (Wk 1–3)
Isolating cart, payment, and inventory domain models from legacy monolith into lightweight micro-services.
Edge Topology (Wk 4–7)
Setting up multi-region Redis clusters with atomic Lua script reservations and global Cloudflare Workers.
Payment Rails (Wk 8–11)
Designing idempotent asynchronous webhook consumers and redundant Stripe fallback paths.
Load Emulation (Wk 12–14)
Running distributed k6 load tests ramping to 200k synthetic buyers with zero deadlocks.
“For the first time in our company's history, Black Friday came and went without a single page alert or database lockup. Codedway's engineering was flawless.”
Atomic In-Memory Reservation
Optimistic inventory reservation utilizing Redis Lua scripts to eliminate database locking entirely.
Edge Cart Rendering Engine
Sub-25ms cart and catalog rendering delivered through geographically distributed serverless edge workers.
Idempotent Payment Pipeline
Zero-loss transaction processing pipeline handling payment webhooks with guaranteed at-least-once delivery.
Event-Sourced Order Ledger
Append-only order state transitions synchronized asynchronously into PostgreSQL for analytical querying.
Dynamic Currency & Tax Calculator
Real-time automated calculation of VAT, customs duty, and localized pricing across 120 global currencies.
Headless Storefront SDK
Type-safe SDK allowing marketing teams to deploy lightning-fast Next.js landing pages and shopping funnels.
Numbers don't lie.
“We processed our largest product drop in company history in under four minutes with completely flat server CPU graphs.”
Global consumer brand Nexa suffered repeated infrastructure crashes during peak flash sales. Legacy relational database locking produced database connection pooling exhaustion and lost sales.
During peak retail surges, the multi-region distributed cart engine processed 180,000 checkout operations per minute with sub-second P99 response times and zero oversold inventory.
Engineering Bottlenecks
- Inventory Locking Contention: High concurrent requests for identical SKU items caused row-level locks to deadlock Postgres pools.
- Global Latency Disparity: Shoppers in APAC and EMEA experienced 3,000ms+ round trips back to a single US-East central database.
- Third-Party Payment Webhook Drop: Inbound payment notifications from Stripe occasionally timed out during sudden volume spikes.
Engineering Solutions
- Multi-region Redis clusters executing distributed Lua scripts for atomic inventory reservations without persistent DB locks.
- Geo-distributed edge caches terminating SSL and rendering dynamic cart states in under 25ms.
- Asynchronous reconciliation workers using idempotent transactional queues to finalize payments reliably.
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