Most engineering leaders think they know what hiring costs. They're usually off by 300%. You count recruiter fees and salary, maybe some job board credits. But hiring has dozens of micro-costs that compound into six figures per role without anyone noticing. Here's how to track what you're actually spending.

The Visible Costs Everyone Tracks

These are the line items that show up on invoices. They're easy to measure but represent maybe 40% of your total spend.

Recruiter fees: 15-25% of first-year salary per hire. For a $120K engineer, that's $18K-$30K per placement.

Job boards and sourcing tools: LinkedIn Recruiter runs $8K-$12K annually. Stack Overflow, AngelList, or niche boards add another $3K-$5K each.

ATS and hiring software: Greenhouse or Lever cost $6K-$15K per year depending on volume.

Background checks and assessments: $50-$200 per candidate who reaches final rounds.

For a team hiring 8 engineers a year through agencies, you're at roughly $200K before anyone on your team does anything.

The Hidden Labor Costs That Actually Kill You

This is where CTOs consistently underestimate by 5-10x. Your senior engineers aren't just "helping with interviews." They're running a part-time recruiting operation.

Resume screening time: If you get 150 applications per role and your VP Engineering spends 2 minutes per resume, that's 5 hours at $150/hour loaded cost. $750 per role, just to say "no" to 140 people.

Phone screens: 30-minute calls with 20-30 candidates per role. Assume your EM does these at $100/hour loaded. That's 10-15 hours per role. $1,000-$1,500 in labor before anyone writes code.

Technical interviews: Here's the real cost. You run 4-5 rounds with 8-10 candidates who make it past screens. Each round burns 60-90 minutes of engineering time, usually with 2 people in the room.

Do the math: 10 candidates × 4 rounds × 75 minutes × 2 engineers = 100 hours of engineering time per hire. At a blended rate of $120/hour loaded cost, you just spent $12,000 in engineering labor to hire one person.

Take-home assignment reviews: If you give take-homes to 10 candidates and spend 45 minutes reviewing each one, that's 7.5 hours per role. Another $900-$1,200.

Coordination and scheduling: Someone is emailing candidates, booking rooms, rescheduling when people cancel, debriefing after each round, updating the ATS. Budget 10-15 hours of administrative time per role at $50-$75/hour.

Most engineering teams hiring 6-8 people per year are burning 600-800 hours of existing engineering time on interviews. That's half an engineer's annual productivity just running hiring loops.

The Opportunity Costs No One Measures

Your staff engineer who spent 15 hours last week interviewing didn't ship the API refactor that's blocking two other teams. Your EM who did 12 phone screens this month didn't mentor the junior who's now stuck.

The typical small engineering team (15-25 people) spends 30% of their senior engineering time on hiring when they have open roles. For a team with 5 senior engineers at $180K loaded cost each, that's $270K in opportunity cost annually.

You can't invoice this. But it directly impacts roadmap velocity, technical debt, and team morale.

The Failure Costs That Hurt Twice

Bad hires: If you hire someone who doesn't work out in 6 months, you've paid their salary ($60K), benefits and overhead (add 30%, so $78K total), plus severance if you're decent about it ($10K-$20K). You also burned all the interview costs above and now have to start over. Total cost of one failed hire: $110K-$130K.

Extended time-to-fill: Every extra month a role stays open costs you the monthly value that engineer would have produced. For a senior engineer who would generate $20K-$30K of value per month, a 90-day hiring process that stretches to 120 days costs you an extra $20K-$30K in delayed output.

Candidate drop-off: When your process takes 8 weeks and has 6 rounds, you lose 40-60% of candidates to other offers. You just wasted all the screening and interview costs on people who never join. If you spent $3K in labor getting someone to final rounds and they accept elsewhere, that's pure loss.

What To Actually Track

Build a spreadsheet. Update it monthly. Track:

• Total applications per role

• Hours spent screening (person × hours × loaded hourly rate)

• Number of phone screens conducted (person × hours × rate)

• Number of technical interview rounds (people in room × hours × rate)

• Take-home reviews completed (person × hours × rate)

• External costs (recruiters, tools, job boards)

• Time-to-fill in days

• Offer acceptance rate

• 6-month retention rate

Calculate cost-per-hire by dividing total costs (labor + external) by number of hires. Most small engineering teams discover they're spending $25K-$45K per successful hire when they include labor. With a bad process, it's closer to $60K-$80K.

The Real Number

For a 20-person engineering team hiring 6 people per year through a mix of agencies and internal process:

• External costs: $120K (agencies, tools, job boards)

• Internal labor: $180K (screening, interviews, coordination)

• Opportunity cost: $200K (delayed projects, distracted seniors)

• Failure tax: $40K (one bad hire every 18 months, extended time-to-fill)

Total: $540K to hire 6 engineers. That's $90K per hire. And you're probably still spending 30% of your time in interview loops because your shortlisting process doesn't actually work.

Most CTOs don't track this because it's uncomfortable. But you can't fix what you don't measure.