Fixed-Price vs. Hourly Developer Billing

The decision hinges on one question — can you write down what "done" means before work starts? If yes, fixed-price is the cleaner fit: the spec becomes the contract, and the developer absorbs the estimation risk. If no, hourly is more honest, because nobody can quote a price for work that isn't yet defined.

A practical rule: discovery, debugging an unfamiliar legacy codebase, and open-ended maintenance belong on hourly. A new MVP, a specific feature, or a marketing site belong on fixed-price. When a project has both — an unknown phase followed by a known build — split it: a small hourly or fixed-fee discovery sprint to produce the spec, then a fixed-price quote against that spec. That sequencing removes most of the disputes that come from quoting a blurry target.

Hourly looks cheaper on the rate card and is harder to budget in total — the final number depends on hours nobody can count in advance, and every revision adds to the invoice. Fixed-price quotes the whole outcome up front, so the developer prices in a buffer for the unknowns. You pay for that certainty; in exchange you can plan around a single number and a milestone schedule.

Real delivery speed matters more than the model. As a solo full-stack developer, I work without an account-manager layer or internal handoffs, which keeps either model affordable. For exact figures, contact me for a quote — a fixed-price number only means something against a written scope, and an hourly estimate only means something once the work is actually understood.

Fixed-price suits a contained, well-described build. BookBed — a booking SaaS with bidirectional iCal sync, built on Flutter, Firebase, and Stripe — and Pizzeria Bestek, a React and Supabase ordering app, both had a clear target before code started, so a fixed scope and a known budget fit cleanly. Callidus, a clinic SaaS on React and Firebase, was the same shape: a defined product, milestone-billed.

Hourly earns its place after launch. Once a product is live, the work becomes a stream of small, undefined tasks — a bug here, a tweak there, a third-party API that changed its response. Pricing each of those as a separate fixed quote creates friction and slows you down. A monthly hourly retainer or a support arrangement covers that ongoing, unpredictable work without re-scoping every small change.

The usual hourly mistake is treating the rate as the budget. A low hourly rate paired with no estimate and no cap is how a project quietly doubles in cost — ask for a not-to-exceed ceiling and a rough hour range so the open-ended model still has guardrails. The usual fixed-price mistake is signing a fixed quote against a vague brief: when requirements shift mid-build, the developer is now delivering something different from what was priced, and someone ends up resentful.

The fix for both is the same — a written spec. Fixed-price forces that document before any code is written, which is its quietest advantage. With hourly, write the spec anyway and revisit it whenever scope changes. Either way, agree how change requests are handled — re-quote on fixed-price, log and bill on hourly — before they arrive, not after.