Part of the Primis "Built for Scale" series.
Scaling an engineering team is one of those things that looks straightforward until you are actually doing it. The structure that works at 15 engineers quietly stops working somewhere around 50, and by the time most companies notice, delivery has already started to slip and the best people are getting frustrated.
The good news is that the inflection points are predictable. Here is what we see again and again from the hiring side.
Under 20 engineers: forget the structure
Honestly, at this size you do not need much structure at all. Everyone knows what everyone else is doing, communication happens naturally, and the founders or CTO are usually still close enough to the work that formal layers would just get in the way.
What matters here is who you hire, not how you organise them. The engineers who thrive at this stage are the ones with a product mindset. People who use what they are building, push back when something does not make sense, and treat the company's problems as their own. Pure technical excellence without that instinct tends to underdeliver at this stage.
The thing to avoid: Hiring managers before you have enough people to manage. It adds overhead, frustrates the person you just hired, and solves a problem you do not yet have.
20 to 80 engineers: the first real decisions
This is where it gets interesting, and where a lot of companies start to feel the strain without quite knowing why. The team is too big for everyone to know what everyone else is doing. The CTO is stretched across too many conversations. Delivery starts to feel less predictable.
A few things need to happen here. Engineering managers start to make sense, typically promoted from within, each owning a team of five to eight engineers. Anything above eight and you are not really managing, you are triaging. The average engineering manager in 2026 handles over 12 direct reports, well above what actually works, and it shows.
You also need someone who can hold technical direction without going into management. A Staff or Principal Engineer who is close to the architecture, makes the calls that keep quality high, and gives your best senior engineers somewhere to grow that is not a people manager role.
And if the CTO is still running the day-to-day at 60 or 70 engineers, that is probably the conversation to have. A VP of Engineering to own delivery, team health, and hiring frees the CTO up for the things only they can do.
The thing to avoid: A CTO with 15 direct reports is not leading, they are coordinating. If that sounds familiar, the structure needs attention before the person does.
80 to 250 engineers: specialisation is no longer optional
At this scale the idea of one unified engineering team stops being useful. You have squads forming around product areas, infrastructure becoming a bottleneck, and onboarding new engineers taking longer than anyone is comfortable admitting.
This is when a dedicated platform engineering team stops being a nice-to-have. In 2026, 80% of software engineering organisations are expected to have one. The signal that you need it is usually obvious: slow deployments, painful onboarding, engineers spending too much time on infrastructure problems rather than product work. A good rule of thumb is one platform engineer for every eight to twelve product engineers, with a minimum of two or three before the function has any real impact.
The VP of Engineering is earning their salary hardest at this stage. The org design decisions made between 80 and 250 engineers shape everything that follows. Stripe found that productivity drops nearly 20% during rapid headcount growth when teams lack clear ownership. More process is rarely the answer. Clearer ownership almost always is.
The thing to avoid: Teams that have grown without boundaries. When nobody is quite sure who owns what, the best engineers start looking elsewhere.
250 to 500 engineers: the leadership layer matures
By this point you likely have multiple Directors or VPs across engineering domains, a platform team with its own leadership, and a CTO who is spending more time at board level and industry events than in sprint reviews. That is exactly right.
The CTO and VP of Engineering are peers here with genuinely different jobs. The CTO owns the technology strategy and the external conversation. The VP of Engineering owns the organisation that does the building. Neither role works as well when one person is trying to do both.
The platform function also reaches a real threshold at this stage. Sub-teams form around CI/CD, cloud infrastructure, and developer experience. A Director or Head of Platform Engineering becomes a necessary hire.
The thing to avoid: A CTO who is still too close to delivery at this scale is usually a symptom of an unclear leadership structure rather than admirable hands-on instinct. The VP of Engineering exists so the CTO does not have to be in those rooms.
500 people and beyond: engineering becomes an institution
At this scale you are not just building a product, you are building an organisation that builds a product. The platform function becomes a full internal product team with its own VP. The CTO operates more like an industry executive than an engineering manager. And the technical decisions made at 30 engineers start showing up as very real costs.
The companies that built well early tend to scale here with relatively low friction. The ones that cut corners on infrastructure and architecture spend significant engineering resource on remediation rather than growth.
The thing to avoid: Assuming the structure that got you here will get you to the next stage. Every phase of growth needs someone actively questioning whether the current design still fits. The best VPs of Engineering are redesigning the organisation before the problems arrive, not after.
A few things that hold true at every stage
Keep span of control honest. Five to eight direct reports per engineering manager is not a guideline, it is the range where good management actually happens.
Build the individual contributor track seriously. Your best senior engineers should not feel that management is the only way to grow. Staff and Principal Engineer roles are not consolation prizes, they are how you retain the people who keep your technical quality high.
And hire ahead of the pain. The structure that works perfectly today is probably already wrong for where you will be in twelve months. The companies that scale well design for the next stage before the current one starts to break.
Thinking about your next engineering hire?
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If you want to talk through the right hire for where you are right now, we would love to help! Drop a message to Marketing@primis-talent.com and we'll be in touch.