Agency vs. In-House Dev Team: The Real Cost Breakdown for Startups

The Fully-Loaded Cost of a Senior Engineer

A $120K/year senior engineer in the US doesn't cost $120K. Add payroll taxes (7.65% FICA = $9,180), health insurance ($6,000–$10,000/year for single coverage), equity (typical 0.25–1% over 4 years for early stage), recruiting cost (15–25% of first-year salary = $18K–$30K), laptop + tooling ($3,000–$5,000), and 3–6 months to full productivity. Fully loaded, you're looking at $160,000–$180,000 per year in cash, plus equity that could be worth 10–100× that if the company succeeds. Most founders do not account for recruiting costs or ramp time.

• Base salary: $120,000
• Payroll taxes + benefits: +$20,000–$30,000
• Recruiting (headhunter or time): +$15,000–$30,000
• Equity: 0.25–1% (not cash, but real cost at exit)
• Ramp time (3–6 months at partial productivity): +$30,000–$60,000 opportunity cost
• Total first-year cost: $185,000–$240,000

What an Agency Actually Costs

A quality MVP agency charges $3,000–$20,000 for a fixed-scope MVP depending on complexity. Hourly rate engagements run $100–$250/hour for strong US/EU teams. The math that matters: a 3-month build at 40 hours/week × $150/hour = $72,000. That's also approximately what a single senior engineer costs for 3 months fully loaded. The difference: the agency ships a complete product (design + backend + frontend + deployment), while a single engineer ships backend code that still needs a designer, a QA engineer, and a DevOps person — all separate costs.

• Fixed-scope MVP: $3,000–$20,000 (predictable, bounded)
• Hourly retainer: $100–$250/hour × hours used
• No recruiting, no benefits, no ramp time cost
• Full cross-functional team in one engagement

When Agency Wins

Agency is almost always the right choice when: you're pre-seed and every dollar of runway is a month of survival, you need a full product (design + mobile + web + backend) not just code, your scope is bounded and you don't need 40 hours/week of engineering output yet, and you want to validate with real users before committing to a $500K/year eng team. The question isn't 'is the agency hourly rate high?' — it's 'what does 3 months of building actually cost in each scenario?' On that comparison, agencies win in the first 18 months for most startups.

When In-House Wins

In-house wins when you have product-market fit and need continuous iteration at pace. Once you're doing 3+ feature releases per month and have a stable product foundation, a dedicated in-house team gets faster feedback loops, deeper product context, and lower marginal cost per feature. Series A+ startups with $1M+ ARR and a validated product should be building in-house teams. Pre-PMF startups almost always get more value from agency speed.

• Post-PMF: in-house team builds faster product context over time
• Series A+: hiring budget exists, team size justifies overhead
• Continuous iteration (5+ features/month): in-house marginal cost drops
• IP-sensitive architecture: in-house reduces knowledge distribution risk

The Hidden Cost: Equity

Early employees take equity. A CTO at a seed-stage startup typically gets 1–5% equity. At a $50M exit, that's $500K–$2.5M the founders didn't keep. An agency takes no equity. This is the comparison most founders forget. If you're choosing between giving away 2% equity to hire a CTO pre-product or spending $15K on an agency MVP to validate before hiring, the agency option is almost always financially superior — and it keeps your cap table clean for investors.

The Hybrid Model: Agency for Launch, In-House for Scale

The strategy that wins most often in practice: use an agency to ship the MVP and the first 2–3 iterations, then hire in-house once you have revenue, users, and a validated codebase to build on. The agency de-risks the product, the in-house team scales it. You also get to hire engineers into a working product — which is a much better recruiting story than 'help us build from scratch.'