As UK retailers prepare for the biggest online shopping weekend of the year, new research from LaunchDarkly, a feature management platform, warns that mounting deadline pressure is causing software teams to take dangerous shortcuts, putting millions in online sales and customer loyalty at risk.
Unsafe code releases threaten Black Friday performance
The findings reveal that 40 per cent of software teams admit to deploying risky or untested code changes under pressure, while more than 80 per cent experience production incidents weekly or more often.
For retailers, these behaviours can translate directly into downtime, lost sales, and reputational damage during Black Friday and Cyber Monday. The event has become an annual stress test for digital infrastructure, with engineering teams under intense pressure to roll out discounts, adjust pricing engines, and update online experiences in real time. Even a minor glitch can mean thousands in lost revenue during these critical trading windows.
To safeguard performance, LaunchDarkly experts recommend five guardrails every retailer should have in place before the big weekend:
- Plan for failure, not just success: load test at three times expected peak traffic and have a plan B and C ready
- Use feature flags as guardrails: toggle features on or off instantly to respond to incidents without redeploying code
- Automate recovery where possible: link feature flags to real-time telemetry so systems react before users notice
- Audit key channels: ensure email deliverability and critical service providers are tested and backed up before the big weekend
- Replace risky code freezes: adopt progressive delivery to keep releasing safely, with full control over who sees what and when
“Black Friday exposes how fragile many digital systems still are,” said Joe Byrne, Global Field CTO, LaunchDarkly. “Retailers spend all year preparing for this weekend, yet too many are still gambling on unstable code and hope-for-the-best releases. Retailers who build resilience into every release — through testing, automation, and control will not only move fast, but recover faster.”
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