In the first year of Vulpine Creations, I spent approximately 80% of my time building and 20% selling. The ratio felt right. The products were beautiful. The quality was impeccable. The packaging was refined. The brand was polished.
Revenue was terrible.
Not because the products were bad — they were excellent. But because excellent products sitting in a warehouse generate exactly zero revenue. The market doesn’t reward the best product. It rewards the best product that people know about.
A founder I met at a conference in Vienna told me something that changed my ratio overnight: “You’re building an art collection. You need to be building a business. Businesses sell things.”
She was right. I reversed the ratio. Within six months, revenue quadrupled. Not because the products improved — they were already good. Because I finally spent the time telling people they existed.
The Engineer’s Trap
I came from engineering. Engineers build. That’s the training, the identity, the source of pride. A well-built thing is its own reward. The beauty of a system that works, a product that performs, a design that solves the problem elegantly — these are the things that light up the engineering brain.
Sales is the opposite of everything engineering values. Sales is messy, subjective, emotional, and uncomfortable. It requires putting yourself in front of people who might say no. It requires making claims about value that feel uncomfortably close to bragging. It requires learning a skill that engineering school doesn’t teach and engineering culture doesn’t respect.
So engineers build more. They refine. They improve. They add features nobody asked for. They redesign the packaging for the fourth time. Every hour spent building feels productive because building produces tangible outputs. Every hour spent selling feels uncomfortable because selling requires confronting the possibility that nobody wants what you’ve built.
The from engineering to entrepreneurship shift is largely about this ratio. Engineers become entrepreneurs when they accept that building is 30% of the job and selling is 70%.
Why 70/30 and Not 50/50
Fifty-fifty sounds balanced and reasonable. It’s also insufficient.
Here’s why: selling compounds in a way that building doesn’t. Every sales conversation teaches you something about your customer. Every piece of marketing content creates an asset that works while you sleep. Every email sent builds a relationship that may produce revenue for years.
Building, past a certain quality threshold, has diminishing returns. The difference between a product that scores 85/100 and one that scores 95/100 is enormous in development time and negligible in customer perception. Customers don’t buy the best product — they buy the product they find, trust, and understand.
At Vulpine, our product quality stabilized around month eight. From that point forward, every additional hour of product development produced marginal improvements. Every additional hour of marketing, sales outreach, and customer communication produced significant revenue growth. The math dictated the ratio.
Among the 40+ startups at Startup Burgenland, the pattern was consistent. Startups that spent more time selling than building reached profitability faster. Startups that spent more time building than selling had better products that fewer people knew about. Both groups worked the same number of hours. The selling group made money.
What “Selling” Actually Means
Most founders hear “selling” and imagine cold calls, aggressive pitches, and slimy tactics. This fear prevents them from selling at all.
Selling, for a founder, means any activity that puts your product or service in front of a potential buyer:
- Publishing content that demonstrates your expertise
- Sending emails to people who might benefit from your product
- Having conversations about problems your product solves
- Asking satisfied customers for referrals
- Optimizing your product listings for search
- Running paid advertising
- Speaking at events
- Partnering with complementary businesses
- Following up with leads who expressed interest
- Asking for the sale
That last one is the one most founders skip. You can do everything else perfectly and still leave money on the table because you never actually asked someone to buy. The ask isn’t aggressive. It’s helpful: “Based on what you’ve told me, this product would solve your problem. Would you like to try it?”
Daily revenue tracking makes the 70/30 ratio tangible. When you see the direct correlation between selling activities and revenue, the motivation to sell increases naturally. The numbers don’t lie, and they don’t respect your preference for building.
The Practical 70/30 Week
Here’s how the ratio maps to a 50-hour work week:
Selling (35 hours):
- Content creation and publishing: 10 hours
- Direct outreach and sales conversations: 8 hours
- Email marketing and list building: 5 hours
- Advertising management and optimization: 4 hours
- Networking and partnership development: 4 hours
- Customer follow-up and referral requests: 4 hours
Building (15 hours):
- Product improvement based on customer feedback: 6 hours
- Systems and process development: 4 hours
- Financial management and tracking: 3 hours
- Administrative tasks: 2 hours
Notice that building time is focused on customer-informed improvements, not speculative development. Every building hour responds to something the selling hours revealed. Customer feedback drives product changes. Sales data drives process improvements. Revenue patterns drive financial decisions.
The selling activities feed the building activities with real information. Without the selling, the building is based on assumptions. With the selling, the building is based on evidence.
Transitioning From 30/70 to 70/30
If you’re currently spending 70% of your time building, flipping the ratio overnight is impractical and disorienting. Here’s the transition I recommend:
Week 1-2: Audit your time. Track every hour for two weeks using a simple spreadsheet. Categorize each hour as “selling” or “building.” See the actual ratio. Most founders are shocked — they estimate they’re at 50/50 when the data shows 20/80.
Week 3-4: Shift to 40/60. Block two additional hours per day for selling activities. Move two hours of building activities to a “parking lot” list. The building tasks don’t disappear — they get deprioritized. Fill the selling blocks with the easiest selling activities first: publishing content you’ve already drafted, sending follow-up emails to existing contacts, optimizing existing product listings.
Week 5-6: Shift to 50/50. Add another two selling hours. Remove another two building hours. By now, you’ll start noticing the revenue impact. The increased selling is producing responses, conversations, and possibly sales. The building you’re not doing? You’re probably not missing it as much as you feared.
Week 7-8: Shift to 60/40. Getting close. The selling activities are now producing enough feedback to inform your building activities, which makes the remaining building time more productive. You’re not building less effectively — you’re building more effectively, because you know what to build.
Week 9-10: Shift to 70/30. The full ratio. Building is now focused exclusively on the highest-impact improvements identified through selling activities. Selling is now your primary activity. Revenue should be noticeably higher than when you started.
The transition takes two months. The revenue impact lasts the life of the business.
The Resistance and How to Overcome It
Every builder-founder will resist this ratio. Here’s what the resistance sounds like and how to address it:
“But the product isn’t ready.” It’s ready enough. Ship it ugly. The market will tell you what “ready” actually means, and it’s almost certainly a lower bar than you’ve set for yourself.
“But I’m not good at selling.” Neither was I. Nobody is, at first. Selling is a skill, and like every skill, it improves with practice. The only way to become good at selling is to do it badly for a while. The 70/30 ratio gives you enough reps to improve quickly.
“But the quality will suffer.” Only if you stop building entirely. The 30% building time — focused on the right things, informed by customer data — produces better quality outcomes than 70% building time guided by assumptions. Targeted improvement beats diffuse refinement.
“But I enjoy building more.” Of course you do. Building is comfortable. Selling is uncomfortable. Comfort doesn’t build businesses. The discipline of doing the uncomfortable thing — daily, consistently, at 70% of your available time — is what separates businesses that make money from businesses that make products nobody buys.
The Exception
There is one period where the ratio can flip: the initial product development phase. Before you have something to sell, building must dominate. But this phase should be measured in weeks, not months. Get to a minimum viable product as fast as possible, then flip the ratio.
The one habit that separates builders from dreamers is shipping weekly. Once you’re shipping, the 70/30 ratio takes over. Sell what you’ve shipped. Learn from the selling. Build the next version informed by what you learned. Ship again. Repeat.
Build less. Sell more. The revenue will tell you whether I’m right.
