Outsource or Build In-House? How to Actually Decide
Salary tables lie. Timing, domain knowledge, and post-launch operations decide it — three models, one table.
The deciding factors are timing and whether the product is your core business, not headline cost. Need to ship in 3–6 months and software isn't what you sell? Outsource. Is development the business, with a system you'll touch weekly for 2+ years? Build in-house. With a senior developer in Korea typically costing KRW 80–120 million a year fully loaded, a 4–8 week MVP is faster with an outside team — and the hybrid that moves operations in-house afterward is what most often succeeds in practice.
"Should we just hire a developer?"
We regularly meet founders holding three quotes and no decision. One is cheap, one is expensive, and the third tells them to hire a developer instead. What makes it hard is that none of the three is wrong.
The question feels impossible because the comparison axis is off. Put an outsourcing quote next to a developer's salary and one side always looks cheap. What actually separates the two paths is timing — and whether this product is your core business.
When does outsourcing fit, and when does in-house?
The in-house case is clear-cut. Development is the business, you'll change this system every week for two years or more, and someone who can evaluate code already works for you. With all three in place, outsourcing is just a way to buy speed.
The reverse is equally clear. If the product supports your real business and has to prove itself within 3–6 months, outsource. Start by recruiting and it typically takes 2–3 months to hire and another 1–2 to onboard before the first feature ships.
Decision checklist — three or more 'yes' answers point in-house
- If this system stops, does revenue stop? (development is the business)
- Will you change features weekly for 2+ years after launch?
- Is there someone in-house who can evaluate code and architecture?
- Can you carry one senior salary through a first year with no revenue from it?
- Do regulation or security rules keep outside engineers away from the code?
How should you actually compare costs?
The salary table is only the starting line. A senior developer in Korea typically costs KRW 80–120 million a year once insurance and severance are included, and a minimum team covering planning, design, and engineering is 3–4 people.
Outsourcing slices that spend into project-sized pieces, but costs appear outside the contract. Split planning, design, and development across three vendors and coordination lands on your desk — in our experience it eats 20–30% of the total timeline.
| Criterion | In-house team | Separate vendors (planning / design / dev) | Integrated partner (one team) |
|---|---|---|---|
| Initial cost structure | Fixed — 3–4 salaries leave every month regardless of revenue | Variable — vendor quotes add up; coordination cost is on you | Variable — priced per project; with a demo-first partner, nothing is billed before approval |
| Time to start | 2–3 months to hire + 1–2 to onboard | Selecting and contracting three vendors, 2–4 weeks each | Typically 1–2 weeks after requirements are settled |
| Domain knowledge | Best — it stays inside the company | Scattered across vendors, gone when contracts end | Accumulates at the partner — put documentation in the contract |
| Handover and accountability | No boundaries — but resignation risk | Gaps between planning, design, and dev; blame gets blurry | One team owns the whole thing — dependence on that partner rises |
| Post-launch operations | Immediate response — the team's cost never stops | Separate maintenance contract; a new vendor needs time to learn the code | The build team carries into operations — maintenance is billed separately |
| Scaling flexibility | Low — hard to shrink | High — adjust per project | Medium — adjust per phase; drops under long-term contracts |
Why does outsourced development fail?
Outsourcing fails at the boundaries far more often than in the code. When agency A writes the spec, agency B produces the Figma mockups, and agency C builds, each deliverable is made without assuming the others — and the client's project manager ends up filling the gaps.
The second cause is handover. The source may arrive in a GitHub repository, but if deployment scripts and AWS account access are missing, the next team typically spends 2–4 weeks just understanding what they have. What you receive at contract end needs to be documented before kickoff.
The third is payment structure. When 30–50% is paid upfront by convention, the client loses leverage before seeing any result. Contracting only after a working demo reverses that order.
Is a hybrid possible?
The pattern that succeeds most often is a hybrid split by sequence. An outside team builds the 4–8 week MVP; then, during the 6–12 months after launch when operating data accumulates, you hire one in-house developer who takes over the code and operations.
For that to work, the handover has to be prepared from day one. The GitHub repository belongs to your organization, infrastructure accounts on AWS or Supabase are opened in your name, and decisions are logged in Notion or Jira. A partner reluctant to work this way is a reason to reconsider.
Frequently Asked Questions
- What does outsourced development typically cost?
- It varies with scope, but in the Korean market a corporate website runs from a few million to tens of millions of KRW, a service MVP with admin screens, accounts, and payments typically KRW 30–100 million, and internal systems (SI) scale beyond that with feature count. When comparing quotes, put what's missing — maintenance, handover, hosting, number of design revisions — in the same table as the total.
- Can our own developers take over outsourced code later?
- Yes, if the contract spells out source ownership, whose name the repositories and infrastructure accounts are in, and the documentation scope. The stack matters too: systems built on widely used tools like React, Node.js, and PostgreSQL — all near the top of the Stack Overflow 2024 developer survey — are far easier to staff than ones built on a framework only the vendor knows.
- When does building an in-house team go wrong?
- Most often when the first hire is a single junior developer rather than a senior. Architecture built with no one to review it typically gets rebuilt within a year. The second pattern is product direction changing every six months while the team remains a fixed cost — validating with an outside team first is cheaper in that situation.
- What are the limits of the integrated-partner model?
- Dependence on a single partner. When planning, design, and development sit in one team, coordination is fast, but if that team gets busy or the relationship sours, replacing it is hard. That's why documentation, account ownership, and source rights belong in the contract, along with a quarterly check: could we operate this without them?
- Doesn't building a demo first add time?
- No — a demo typically takes 1–2 weeks and makes one core flow work, not the whole product. It catches the interpretation gaps that paper requirements hide, which cuts rework during the 4–8 week MVP. EnterNext bills nothing until the demo is approved.
- Do the same rules apply to a company website or online store?
- Not really. Projects you won't touch weekly for two years rarely justify an in-house team. There the comparison shifts to search visibility on Naver and Google, whether a Korean platform like Cafe24 or Imweb already covers the need, and whether your staff can edit content through an admin screen. Custom development is worth it only when a platform clearly can't do what you need.
Sources
- Stack Overflow Developer Survey 2024 — Stack Overflow, 2024
EnterNext's system integration practice puts planning, design, and development in one team and builds a working demo before any contract is signed. Nothing is billed until the demo is approved, and an MVP typically ships in 4–8 weeks. If you're weighing outsourcing against building in-house, bring the requirements as they are — we'll show you a demo first.
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