Cumulative cost / mid-level / 13 weeks

Fig 02

Y axis: cumulative onboarding cost (USD)Total at W13: $32,861

Phase register

Day -7 to 0

Pre-board

Productivity 0%

Laptop ordered, accounts created, repository access granted, buddy assigned, calendar pre-populated, welcome packet sent.

Zero day-one friction

Phase cost

$500-$1,500

W01

Week 1

Productivity 5-10%

Orientation, environment running locally, architecture overview, first small ticket assigned (docs, bug, test).

First commit

Phase cost

$3k-$5k

W02-W04

Weeks 2-4

Productivity 15-32%

Mentor pairing peaks. First PR merged. Code review cycle established. Team ceremonies routine.

First PR merged

Phase cost

$8k-$15k

W05-W08

Weeks 5-8

Productivity 32-55%

Owns first feature end-to-end. Rework rate dropping. Mentor time falling to 4-6 hrs/wk.

First production ship

Phase cost

$10k-$20k

W09-W12

Weeks 9-12

Productivity 55-75%

Full sprint contributions. On-call rotation eligibility. Mentor time minimal.

First oncall rotation

Phase cost

$6k-$14k

W13-W16

Weeks 13-16

Productivity 75-95%

Onboarding formally complete. Contributing to technical decisions. 90-day review.

Full velocity

Phase cost

$3k-$8k

Source notes

Productivity percentages derived from logistic ramp models calibrated against TeamStation 2025 developer-ramp data, daily.dev First-90-Days Playbook, and DORA Accelerate State of DevOps. Cost figures assume $160K base salary, $110/hr mentor blended rate, and a four-engineer surrounding team. Adjust on the calculator.

Common questions

How long does developer onboarding actually take?+

Senior engineers reach 90% velocity in 6-10 weeks. Mid-level engineers in 8-14 weeks. Junior engineers in 4-6 months. Staff engineers ship code in week two but take 3-6 months to land strategic impact. Codebase complexity can add 50-100% to any of these.

What is the cumulative cost during ramp?+

For a $160K mid-level engineer in a moderate-complexity codebase, expect $18k-$22k cumulative cost by week four, $35k-$40k by week eight, and $48k-$55k by week twelve. The rate of accumulation slows as productivity rises.

When does a new hire actually break even?+

Break-even (cumulative value contributed > cumulative cost) typically lands at week 14-22 for mid-level engineers, week 9-13 for seniors, and week 26-40 for juniors. Past that point, every additional week is positive ROI.

What changes the ramp curve most?+

Codebase complexity (1.2x for legacy, 0.85x for documented), programme maturity (1.25x for ad-hoc, 0.72x for excellent), and pre-boarding quality. Of these, programme maturity is the most controllable on a quarter-to-quarter basis.