Engineering, Leadership

When to Move from Dev Agency to In-House Engineering

Your agency got you this far. Here is how to know when it is time to build your own team.

Mike Tempest • 10 min read • 22 March 2026

Most startups begin with a dev agency, and for good reason. You need a product built, you do not have a technical co-founder, and hiring a full engineering team before you have product-market fit is a gamble you cannot afford.

Agencies solve that problem. They give you access to a team of experienced developers without the overhead of recruitment, management, or long-term commitment. For an early-stage company shipping an MVP or testing a market, this makes complete sense.

But there is a moment, usually somewhere between Series A and scaling, where the agency model stops working. Not because the agency is bad. Because your needs have changed. The same qualities that made agencies attractive early on (flexibility, breadth of skills, shared resources) become liabilities when you need deep product knowledge, speed of iteration, and a team that lives and breathes your problem space.

Recognising that moment is one of the most important decisions a founder makes. Move too early and you burn runway on a team you cannot yet manage. Move too late and you lose months of velocity to an arrangement that no longer fits.

The Agency Got You Here

Before we talk about moving on, it is worth acknowledging what agencies do well. We have worked with startups where the agency relationship was genuinely excellent in the early stages.

A good agency brings process, experience across multiple projects, and the ability to staff up quickly. They have seen dozens of MVPs and know which shortcuts are acceptable and which will haunt you. They handle DevOps, testing, and deployment without you needing to think about it. For a founder focused on customers and fundraising, this is invaluable.

The mistake is not using an agency. The mistake is staying with one too long.

Five Signs You Have Outgrown Your Agency

1. Knowledge drain is slowing you down

Agency developers rotate between projects. The person who built your payment integration last quarter may now be working on someone else's product. Every time a developer rotates off your project, institutional knowledge walks out with them. The next developer spends weeks getting up to speed, and subtle context is lost permanently.

You notice this when you start hearing "I am not sure why it was built that way" from the agency team. When nobody on the project can explain the reasoning behind key architectural decisions, you have a knowledge problem that will only get worse.

2. Velocity has plateaued despite growing spend

Early on, adding hours to the agency contract meant more features shipped. At some point, this relationship breaks down. You are spending more each month but shipping at roughly the same pace. The agency is not slacking. The product has become complex enough that coordination overhead, context switching, and communication lag are eating into productive time.

This is a structural problem, not a performance problem. Agencies optimise for utilisation across clients, not for deep immersion in yours. As your product grows, the gap between what you need (dedicated, deeply contextual work) and what the agency model provides (competent, shared resources) widens.

3. The cost crossover point has arrived

Agency rates in the UK typically range from 500 to 1,200 pounds per developer per day. Once you are consistently using two or more full-time equivalent developers through the agency, the maths starts favouring in-house. A senior developer in the UK costs 70,000 to 100,000 pounds per year in salary. Add 30 percent for employment costs, equipment, and overhead, and you are looking at roughly 90,000 to 130,000 pounds fully loaded.

Compare that to the agency: two developers at 800 pounds per day each, five days a week, fifty weeks a year comes to 400,000 pounds. Even accounting for the management overhead of in-house staff, the numbers speak for themselves.

The crossover is not just about cost, though. In-house developers build compounding knowledge. Every day they spend on your product makes them more effective. Agency developers start from a lower baseline each time they rotate.

4. Product complexity demands deep ownership

Simple products work well with agencies. Build a feature, ship it, move on. But as your product matures, decisions become interconnected. A change to the data model affects the API, which affects the mobile app, which affects the analytics pipeline. This kind of work requires someone who holds the full picture in their head, not someone who picks up a Jira ticket and works on it in isolation.

If your product roadmap increasingly involves cross-cutting concerns, refactoring, and architectural evolution rather than isolated feature work, you need people who own the system end to end.

5. You are competing with your agency for talent

This one is subtle but telling. The best developers at your agency are in demand, both within the agency and from other clients. You cannot guarantee that your favourite developer stays on your project. Worse, if you try to hire someone away from the agency, you will likely face contractual restrictions or damage the relationship.

Meanwhile, the agency needs to keep its best people busy across its highest-paying clients. Your interests and the agency's interests are not fully aligned, and they never will be. That is not a criticism of agencies. It is the nature of the model.

The Transition Is Not Binary

The biggest misconception about this transition is that it is an overnight switch. Fire the agency on Friday, hire developers on Monday. That approach fails almost every time.

The reality is that most successful transitions use a hybrid model for three to six months. Your first in-house hires work alongside the agency, gradually taking ownership of different parts of the system. The agency shifts from building features to supporting knowledge transfer, then to being on-call for specific legacy components, and eventually the relationship winds down naturally.

We have seen founders try to cut the agency abruptly after a frustrating month. The result is always the same: the new in-house team inherits a codebase they do not fully understand, with no one to ask questions, and spends months just getting their bearings. The agency's institutional knowledge, flawed as it may be, has value. Extract it deliberately.

A hybrid approach also reduces risk. If your first hire does not work out, you are not left with zero engineering capacity. The agency provides a safety net while you build confidence in the new team.

What the First 90 Days Look Like

If you have decided to make the move, here is a realistic timeline for the first three months. This assumes you have funding in place and are ready to hire.

Weeks 1 to 4: Audit and Plan

Before you hire anyone, understand what you are working with. Conduct a thorough technical audit of the codebase the agency has built. Document the architecture, deployment processes, third-party integrations, and known technical debt. Identify which parts of the system are well-built and which need attention.

This audit informs your first engineering hire. If the codebase is solid and needs feature development, you might start with a mid-level developer. If there are architectural problems, you need someone senior who can refactor while delivering.

Weeks 4 to 8: First Hires and Knowledge Transfer

Your first engineering hire should overlap with the agency for at least four weeks. During this period, the agency walks your new developer through the codebase, explains design decisions, and pairs on any complex areas. Insist on this overlap even if the agency charges for it. The alternative is months of your new hire reverse-engineering decisions from code comments and git history.

Set up the engineering fundamentals that agencies often handle behind the scenes: CI/CD pipelines that your team controls, staging environments, monitoring, and incident response processes. Your new team needs to own the full development lifecycle, not just write code.

Weeks 8 to 12: Gradual Ownership Transfer

Start shifting feature work to the in-house team while the agency handles maintenance and support. Define clear boundaries: the in-house team owns new features and the agency handles bug fixes on legacy components. As confidence grows, shrink the agency's scope.

By the end of week twelve, your in-house team should be delivering independently on at least one area of the product, with the agency available for questions but not actively building.

Where a Fractional CTO Fits

The transition from agency to in-house is exactly the kind of problem that a fractional CTO is built for. You need senior technical leadership to navigate the change, but you do not yet need (or cannot yet afford) a full-time CTO.

A fractional CTO bridges the gap in several specific ways.

Running the technical audit. Most founders cannot objectively assess the quality of the code their agency has produced. A fractional CTO reviews the codebase, identifies risks, and gives you an honest picture of what you are inheriting. This prevents the common scenario where a new hire joins, discovers the codebase is worse than expected, and immediately wants to rewrite everything.

Defining the hiring plan. What roles do you need first? What seniority? What skills matter most given your specific codebase and roadmap? A fractional CTO turns "we need to hire some developers" into a concrete plan with job descriptions, interview processes, and realistic salary expectations. We have written about the working relationship in detail.

Choosing the right stack and processes. If the agency built on a stack that does not suit your long-term needs, the transition is the natural point to address that. A fractional CTO evaluates whether to continue with the current technology or plan a gradual migration, and sets up the development processes (code review, testing, deployment) that your in-house team will use going forward.

Managing the agency relationship during wind-down. This is politically delicate. The agency may resist losing a client or try to extend the engagement. A fractional CTO handles this professionally, ensuring knowledge transfer happens on schedule and the separation is clean.

At Risika, we went through a version of this process, inheriting work from external contractors and building the in-house team that took the product forward. At RefME, we scaled from a tiny team to handling two million users. In both cases, the transition from external to internal engineering was a defining moment for the company.

Mistakes That Derail the Transition

Hiring too junior too early. Your first in-house developer will set the technical culture for everyone who follows. If you hire someone junior to save money, they will not have the experience to evaluate the agency's work, challenge architectural decisions, or set up proper engineering practices. Invest in seniority for the first one or two hires, then bring in mid-level and junior developers once the foundation is solid.

Cutting the agency before the team is ready. Eagerness to reduce costs leads founders to end the agency contract too early. If your in-house team has not fully absorbed the codebase and processes, you will pay for that haste in lost velocity and production incidents.

Ignoring documentation during handover. Agencies rarely document everything. During the transition, make documentation a deliverable. Architecture decisions, deployment runbooks, environment setup guides, API documentation. If it is not written down, it will be lost.

Assuming the agency's code is the right foundation. Sometimes it is. Sometimes it is not. Do not assume either way. Audit the code before committing to building on top of it. We have seen startups spend a year extending a codebase that should have been partially rewritten from day one.

The Right Time Is When It Feels Slightly Early

If you are reading this and recognising the signs, you are probably closer to the transition point than you think. Most founders we work with wish they had started the process three to six months earlier.

The agency model is not failing you. You have simply outgrown it. That is a sign of progress, and it means you are ready for the next stage.

Start planning now, even if you are not ready to hire tomorrow. Audit the codebase. Work out the budget. Think about what "good" looks like for your first hire. When the moment comes, you will be glad you did the groundwork.

LeadershipEngineering

How to Evaluate Your Engineering Team as a Non-Technical Founder

23 March 202610 min read

StrategyEngineeringLeadership

How to Build a Technology Roadmap for Your Startup (Without a CTO)

23 March 202611 min read

FundraisingEngineeringLeadership

Your First 90 Days After Raising: A Technical Playbook for Non-Technical Founders

21 March 202612 min read

Planning the move from agency to in-house?

We offer a free day of product and engineering time with no strings attached. Use it to audit your agency's codebase, plan your first hires, or map out the transition.

Book a Free Day About Mike

Frequently Asked Questions

How do I know if my dev agency relationship is still working?

Track three things: velocity (are features shipping slower despite similar scope?), cost per feature (is the effective hourly rate climbing?), and knowledge retention (can your team explain how the system works without the agency in the room?). If all three are trending in the wrong direction, the relationship has likely run its course.

Can I keep my agency and hire in-house developers at the same time?

Yes, and this is often the smartest approach. A hybrid model lets your in-house team ramp up on the codebase while the agency continues delivering. The key is clear ownership boundaries. Decide which parts of the product the agency owns and which your new hires will take over, then transition module by module.

What is the cost crossover point between agency and in-house engineering?

For most UK startups, the crossover happens around two to three full-time equivalent developers. If your agency bill consistently exceeds the loaded cost of two senior engineers (salary, equipment, benefits, management overhead), you are likely past the crossover point. The exact number depends on your location and the seniority you need.

How long does the transition from agency to in-house typically take?

Plan for six to twelve months from your first hire to full independence from the agency. The first three months focus on hiring, onboarding, and knowledge transfer. The next three to six months involve gradually shifting ownership while the agency remains available for support. Rushing this process is the most common mistake founders make.

Mike Tempest

Fractional CPTO

Mike works with founders across the UK as a Fractional CPTO, providing senior technical leadership on a flexible basis. As Head of Engineering, he scaled RefME from 0 to 2M users (acquired by Chegg), and as CTO turned Risika profitable in 18 months. Previously held technology leadership roles at Google and Apple.

Learn more about Mike