LaunchDarkly or Split When You Build Software for Clients

A statement of work usually fixes a delivery date months out, while your team keeps shipping code every sprint in between. Merging finished work behind a flag and flipping it on the day the contract says lets you keep a normal engineering cadence without freezing the branch for weeks before a deadline. LaunchDarkly's scheduled flag changes let you set that flip in advance and forget it, which matters when the person who negotiated the go-live date isn't the same person doing the deploy.

Client engagements often include an acceptance criterion tied to a metric, not just a feature list, and that's where Split's approach earns its keep: wiring the flag straight to the usage or conversion number the client cares about gives you evidence for the handoff meeting, not just a demo. LaunchDarkly can track basic flag-level metrics too, but Split's experimentation model was built for exactly this kind of before-and-after comparison.

Deployment frequency and recovery time vary a lot across engineering organizations, and the fastest-shipping teams recover from a failed deployment in under an hour, while the slowest can take weeks¹. A client project is not the place to find out which cluster your process falls into. A flag you can flip off from a dashboard, without a redeploy, is the fastest recovery path either platform offers, and it works the same way whether the client noticed the bug or your team caught it first.

A shop running five or six active client engagements at once can end up with flags scattered across as many repos, each with its own naming convention if nobody sets one. Pick a single naming scheme (client, feature, date) before your second engagement starts, and assign flag cleanup as a deliverable in every project's closeout checklist, not an afterthought once the invoice is paid.

A short checklist for keeping client flags manageable:

• Pick one naming scheme built from client, feature and date before your second engagement starts, so flags across repos stay readable.
• Assign flag cleanup as a named deliverable on each engagement instead of leaving stale flags for whoever inherits the code.
• Keep a flag inventory for each client repo that lists what is still active and what can be deleted, ready for handoff.
• Add a small, explicit cleanup line item to fixed-bid estimates, since removal hours compete directly with margin.

Some clients want a private preview of finished work ahead of the official go-live date, which is a different targeting problem than a public staged rollout: you're gating by a specific reviewer's account, often just one or two people, rather than a percentage of traffic. Both platforms handle this the same way, targeting a flag to a specific user identifier, but it's worth setting up a dedicated preview environment or account so a client reviewer never accidentally sees a different client's in-progress work.

On a fixed-bid engagement, flag cleanup competes directly against margin, since every hour spent removing stale flags after delivery is an hour not billed to a new project. Build a small, explicit cleanup line item into your delivery estimate from the start rather than treating it as free overhead, and a client will usually accept it once you explain that leftover flags are technical debt they'd otherwise inherit.

Some clients, especially larger ones with their own engineering team waiting to take over post-launch, will want to own the LaunchDarkly or Split account from day one rather than inheriting it from your shop later. Set that expectation early in the statement of work rather than negotiating it at handoff, since retrofitting account ownership after dozens of flags already exist under your organization's account is more disruptive than starting the engagement with the client as the account holder.

Adopting either platform mid-engagement is a real cost, not a quick swap, since every existing config flag or environment variable gating a feature needs a matching entry in the new system before you can trust it in production. Budget that migration as its own short phase in the project plan rather than assuming your team can absorb it alongside a normal sprint's regular delivery work, and tell the client directly if it will add time to an already-quoted deadline rather than quietly absorbing the cost yourself.