The Ramp Curve Lab/ 28 Apr 2026
Independent ramp-curve research. The first 90 days cost $20,000 to $80,000 per engineer once you count salary during ramp, mentor time, tooling, and team velocity drag. Salary spend alone is just 40% of the picture.
8-22 wks
Time to 90% velocity
15-20 hrs
Mentor peak / week
22%
Leave inside 90 days
Quick Estimate
Pick a seniority and salary. We use the ramp-curve, mentor-tax, tooling, and velocity-drag formulas from the full calculator. Methodology is transparent here.
Range for Mid (2-5 yrs): $120,000 - $160,000 (Levels.fyi 2025-26)
First-90-Days Estimate
RC-MIDTotal onboarding cost
$47k
That is 4.0x the monthly salary, spread across a 12-week ramp curve.
Salary ramp
$17k
Mentor tax
$11k
Velocity drag
$14k
Tooling + HR
$5k
Productivity ramp (weekly)
Cost Register / Where the money goes
| Line item | Share of total | Typical range per hire | Page |
|---|---|---|---|
| Salary during ramp | 42% | $10k-$32k | Open |
| Mentor / buddy time tax | 22% | $5k-$18k | Open |
| Team velocity drag | 18% | $3k-$14k | Open |
| Tooling and licences | 10% | $1.5k-$10k | Open |
| HR, admin, IT setup | 5% | $0.8k-$2.5k | Open |
| Early-attrition risk reserve | 3% | varies | Open |
Distribution derived from SHRM ($4,700 generalist baseline, $8,000+ for IT roles), DORA report 2024-2025, TeamStation 2025 ramp data, and Brandon Hall Group structured-onboarding studies. Cost per hire varies with salary, codebase, and remote policy.
By Seniority / Ramp varies 4x
Juniors are cheapest to hire and most expensive to onboard per productive hour. Staff engineers ship code in week two but need three months of organisational context to land architectural impact.
Junior (0-2 yrs)
W01-W22$15k - $25k
Total first-90-day cost
Open seniority brief →
Mid (2-5 yrs)
W01-W12$25k - $45k
Total first-90-day cost
Open seniority brief →
Senior (5-10 yrs)
W01-W9$40k - $65k
Total first-90-day cost
Open seniority brief →
Staff+ (10+ yrs)
W01-W16$60k - $85k
Total first-90-day cost
Open seniority brief →
DORA-tier benchmarks
Time to first commit, time to first deploy, time to full velocity. Tied directly to onboarding cost, with elite-to-low-performer ranges sourced from the DORA Accelerate State of DevOps framework and Stack Overflow Developer Survey 2025.
Open the full metrics dashboard →| Metric | Elite | High | Medium | Low |
|---|---|---|---|---|
| Time to first commit | 1-2 days | 3-5 days | 1-2 weeks | 2-4 weeks |
| Time to first deploy | Day 1-3 | Week 1 | Weeks 2-3 | Month 1+ |
| Time to full velocity | 6-8 weeks | 8-12 weeks | 12-20 weeks | 5-8 months |
The full lab
Onboarding Calculator
Multi-input cost model with what-if toggles.
Cost by Seniority
Junior to staff: side-by-side cost & ramp.
Ramp Curve Timeline
Week-by-week productivity and cost accumulation.
90-Day Checklist
Pre-board, day one, week one, month three.
30-60-90 Day Plan
Templates for junior, mid, senior, staff.
Seven Hidden Costs
What nobody puts on the budget line.
Best Practices
12 practices ranked by ROI and effort.
Metrics That Matter
Eight DORA-adjacent onboarding metrics.
Remote Onboarding
Cost premium, async tax, tool stack.
Reduce by 20-40%
Eight strategies with savings per hire.
Tools Compared
IDPs, dev envs, metrics, docs - pricing 2026.
ROI Calculator
The CFO one-pager. Payback in months.
22%
leave inside 90 days
DevPath research and the Zartis 2024 onboarding study put first-quarter developer attrition at roughly one in five. Each early exit means restarting the cost clock.
50-200%
of salary to replace
SHRM and Work Institute peg total replacement cost at half to twice annual salary, including re-recruiting, lost knowledge, and team-morale drag.
82%
higher retention with structure
Brandon Hall Group: organisations with a structured 90-day plan keep new hires at a markedly higher rate than ad-hoc programmes.
FAQ
Onboarding a developer costs $20,000 to $80,000 across the first 90 days. Salary during ramp is roughly 40%; mentor time, team velocity drag, tooling, and HR/admin make up the rest. Numbers scale with seniority: $15k-$25k for juniors, up to $60k-$85k for staff engineers.
Senior engineers typically reach 90% velocity in 6-10 weeks, mid-level in 8-14 weeks, juniors in 4-6 months. Staff engineers can produce code in week two but take three to six months to land strategic impact. DORA elite teams hit time-to-first-commit in 1-2 days; low performers take 2-4 weeks.
Mentor opportunity cost. A senior engineer pulled into 15-20 hours of mentoring per week is producing 30% less. Across an 8-12 week ramp that is $8,000-$18,000 of unbilled senior capacity, and most engineering managers never put it in the budget.
Remote onboarding eliminates facilities cost but adds 8-15% in async overhead, equipment shipping, and cloud dev environment licences. Roughly neutral on dollars and slightly negative on time-to-first-commit unless pre-boarding and a strong buddy system are in place.
Yes. Companies with structured 30-60-90 plans, automated dev environments, and assigned buddies report 20-30% faster ramp and 82% higher 90-day retention (Brandon Hall Group). The investment usually pays back inside one hire.
Updated 2026-04-28