You pitched your product, shared your vision, showed the numbers, and still heard «no». Rejection is part of the founder journey, but what stings most is not knowing why. Was the idea too early, the deck too ambitious, or something quietly off that no one pointed out?
Many investors won’t explain their decision, leaving founders to guess, but Ukrainian investor Ruslan Tymofieiev believes founders deserve clarity. After more than a decade of working with startups, he has identified five mistakes that recur again and again.
Ruslan Tymofieiev
Ruslan Tymofieiev was born on June 3, 1991 in Makiivka, Donetsk region of Ukraine. He started his studies at Vasyl Stus Donetsk National University and later earned his degree from Yaroslav Mudryi National Law University. He began his entrepreneurial journey at 18 while still at university, working in internet marketing with a focus on personal development and entrepreneurship. Ruslan is currently the managing partner of the venture fund Adventures Lab and the venture builder CLUST, where he helps turn early-stage ideas into scalable global startups.
Mistake 1: Skipping CustDev
One of the most common — and costly — mistakes young entrepreneurs make is skipping the customer development phase. Ruslan Tymofieiev notes that many founders unintentionally ignore the market by relying too heavily on instinct or rushing into product development without proper validation. This leads to a predictable pattern: ideas are generated based on personal experience or assumptions, with little interaction with potential users. Founders avoid interviews, dismiss feedback, and often treat opinions as confirmation rather than opportunities to test whether their product addresses a real need.
As a result, startups frequently invest time and resources into building polished MVPs that solve non-existent problems. Product launches often fail, with no signups, traction, or feedback, simply because the team never validated whether anyone needed what they built.
In contrast, the most successful early-stage teams treat CustDev as a foundational process. Before writing code, they conduct dozens of interviews to uncover real user pain points, understand daily struggles, and identify unmet needs. The insights are then realised into testable hypotheses and validated using lightweight MVPs such as landing pages, prototypes, or mock features. Engagement metrics, not opinions, guide decisions. Rather than chasing speed blindly, Ruslan Tymofieiev recommends a disciplined loop of research, testing, and iteration. Product-market fit emerges not from guesswork but from systematically learning what truly matters to users.
Mistake 2: Building your business for everyone without a target audience
A recurring issue Ruslan Tymofieiev observes in early-stage startups is the tendency to define «everyone» as the customer. While it may sound ambitious, such broad targeting usually leads to vague messaging, poor conversion rates, and limited traction. Tymofieiev views this as a red flag, not a strength.
From his experience in Adventures Lab and CLUST, the investor recalls a fintech startup that positioned itself as a product for «everyone who sends money», offering a digital wallet with support for cross-border transfers, crypto, fiat, P2P, and B2B use cases — all in one interface. Despite its polished pitch, the startup lacked a clear user persona or focused use case. The result was predictable: no real engagement from any segment.
But imagine the opposite case: a business that chooses to focus on a razor-sharp niche, for example, crypto payroll solutions tailored for Web3 startups. From the start, the team clearly defines their target user, understands their pain points around multi-currency payouts and compliance, and builds messaging that speaks directly to those challenges. With that focus, they’re able to iterate quickly, test what resonates, and land their first ten paying customers within a few months. Their narrow positioning doesn’t limit growth — it accelerates early traction and sharpens product-market fit.
To avoid the pitfalls of vague targeting, Ruslan Tymofieiev advises founders to define a narrow Ideal Customer Profile (ICP) — not just demographics, but roles, pain points, motivations, and decision-making triggers. The investor also advises tracking repeat behaviour — who uses the product consistently, returns on their own, and shares it with others. Pricing, tone, and onboarding should all be tailored to the specific audience. The investor notes that success comes not from reaching the broadest group, but from deeply understanding and winning over the right one.
Mistake 3: Hiring too fast — and hiring wrong
In early-stage startups, every hire carries weight — done well, it accelerates progress; done poorly, it creates drag. Ruslan Tymofieiev often sees founders rush into hiring right after raising their first investment, driven by pressure to scale rather than strategic need. This haste typically leads to misaligned hires, underperformance, and growing inefficiencies that eventually fall back on the founder.
For example, a startup closes a $300,000 pre-seed round and immediately opens five roles: product manager, marketing lead, sales, designer, and junior developer. But within six months, the company is burning $35,000 a month without a functional product to show for it. The CEO, overwhelmed by management overhead, is finding himself doing the core work that they had hired others to handle.
Ruslan Tymofieiev warns that poor hiring isn’t just about one weak link — it’s about the compounding effect: low performers introduce delays, lower execution quality, and increase communication breakdowns. A particularly damaging trend is hiring people into key roles who treat the startup as a regular job. They wait to be managed, avoid taking ownership, and lack the urgency required in a fast-paced environment. In contrast, early-stage startups thrive on generalists and builders — people who act like owners, adapt quickly, and contribute across functions.
Another common mistake is skipping role definition altogether. Founders often begin recruitment without a clear understanding of what success looks like. They don’t define the mission of the role, what problem it’s meant to solve, or the outcomes expected during the first 90 days. Even strong candidates will struggle in this kind of ambiguity.
To avoid these traps, Ruslan Tymofieiev advises founders to treat hiring with the same discipline they apply to product development. That starts with clarity of purpose: what is the role for, what does progress look like, and how will it impact the company’s trajectory? Just as important is assessing mindset and motivation, not just technical skills: the most valuable hires in a startup are those with an ownership mentality — people who are curious, proactive, resilient, and committed. Success comes not from hiring quickly, but from hiring thoughtfully and strategically.
Mistake 4: Overselling in pitches
In the effort to impress the investor, many founders overreach — inflating projections, generalising metrics, and making sweeping claims that don’t hold up under scrutiny. Ruslan Tymofieiev frequently sees pitch decks filled with oversized market estimates, aggressive growth forecasts, and expansion plans for markets that haven’t even been researched or tested. This tendency often stems from a belief that showing a «big vision» is the key to securing investment. But an experienced investor has reviewed hundreds of pitches and can quickly spot when numbers are unrealistic or claims lack substance.
Ruslan stresses that strong founders are upfront about their current stage, openly share both progress and challenges, and support their narrative with concrete data and customer insights. Investor is more interested in what’s been learned than in what’s being promised. Instead of making inflated claims, the founder should focus on transparent traction.
Ruslan Tymofieiev encourages presenting realistic projections framed as testable hypotheses, especially when entering new markets or launching new features. He also advises founders to highlight real customer understanding in their pitch. Instead of focusing on theoretical market size, founders should explain why users engage with the product, what problems it solves, and how those insights guide the roadmap. Your investor wants to see alignment between the product and user behaviour, not just ambitious claims on slides.
Mistake 5: Copy-pasting go-to-market from Ukraine to global
Expanding internationally is a key milestone for any Ukrainian startup, although many teams mistakenly assume that local strategies will also work in foreign markets. Ruslan Tymofieiev frequently sees founders enter foreign markets using the same messaging, sales tactics, and go-to-market (GTM) playbook they used in Ukraine, without adapting to the distinct realities of a new customer base.
This mistake stems from overlooking consumer habits, sales approaches, and purchasing logic in another market. Everything from pricing sensitivity and communication channels to the role of trust in sales can vary, so a pitch that resonates in Kyiv may fall flat in Berlin or São Paulo. Even a brand name that works locally may need to change, as in the case of the Ukrainian startup Rozmova, which rebranded to Clearly for international audiences.
Another common mistake the investor highlights is expanding into multiple countries simultaneously. Spreading efforts across multiple untested markets often results in shallow insights, wasted resources, and missed opportunities to gain deep traction in any one region.
Sales culture is another critical variable. In some markets, personal relationships and local presence are non-negotiable — a trusted local face or even a small office can dramatically improve trust and close rates. Ignoring cultural nuance in favor of a «global from day one» mindset may alienate buyers before a single meeting happens.
To avoid the pitfalls, Tymofieiev advises founders to treat each new market as a separate venture, with its hypotheses, discovery process, and GTM validation. The process starts with localised research into the market’s competitive landscape, customer behaviour, pricing sensitivity, and sales channels. Small-scale experiments, such as targeted ads or localised landing pages, can provide early signals. Founders should speak directly with both buyers and non-buyers to understand what drives — or blocks — adoption.
True localisation goes well beyond translation — it may involve adjusting pricing models, refining key features, redesigning onboarding experiences, and even rebranding the product for a new market. Ruslan Tymofieiev emphasises that the sales journey must be understood market by market — in some regions, cold outreach works; in others, trust is earned through networks or referrals.
Mastering these five pitfalls won’t guarantee success, but ignoring them almost guarantees failure. So, treat customer discovery as a discipline, define a clear and focused ideal customer profile, hire for ownership over résumés, keep investor decks honest, and tailor your go-to-market strategy to fit your target audience.
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