How to Evaluate a Startup Before Joining

That startup offer looks exciting. Fast growth, interesting tech, generous equity. But will the company succeed? And is it the right fit for you?

Don't just trust the pitch. Do your homework. Here's how to evaluate a startup before joining.

Why Due Diligence Matters

The Stakes:

• You're betting 1-4 years of your career
• Your equity might be worth $0 or millions
• Failed startups look bad on your resume
• Culture fit affects your daily happiness

Startups fail 90% of the time. Your job is to find the 10% that succeed—or at least fail fast so you can move on.

The Due Diligence Framework

1. Market and Product

Is there a real problem worth solving?

Questions to ask:

• What problem does the product solve?
• Who experiences this problem?
• How do they solve it today?
• Why is now the right time for this solution?

Red flags:

• Solution looking for a problem
• Tiny addressable market
• "Everyone is our customer"
• Ignoring strong incumbents

Green flags:

• Clear, painful problem
• Large and growing market
• Unique insight or timing
• Early traction validates demand

2. Traction and Growth

Is the product working?

Metrics to investigate:

• Revenue (and revenue growth)
• Active users (and user growth)
• Customer retention
• Sales pipeline
• Unit economics

For Pre-Revenue:

• User engagement metrics
• Waitlist size
• Letters of intent
• Pilot customers

Questions to ask:

• What are your key metrics?
• How have they trended over the past 6-12 months?
• What's your customer acquisition cost?
• What's your churn rate?

Red flags:

• Declining or flat metrics
• High churn
• Vague answers about traction
• "We're pivoting" (again)

Green flags:

• Strong month-over-month growth
• Low churn
• Organic growth and word-of-mouth
• Clear path to next milestones

3. Funding and Runway

How long can they survive?

Questions to ask:

• How much have you raised total?
• How much runway do you have?
• When do you plan to raise next?
• What are the terms of your funding (any unusual liquidation preferences)?

Burn Rate Analysis:

• Monthly burn = Revenue - Expenses
• Runway = Cash on hand / Monthly burn
• Safe runway: 18+ months
• Concerning: <12 months

Red flags:

• Less than 6 months runway
• Multiple down rounds
• Desperate to close next round
• Unusual investor terms (heavy preferences)
• Can't articulate path to profitability

Green flags:

• 18+ months runway
• Path to profitability or next round
• Strong investor support
• Disciplined spending

4. The Team

Can this team execute?

Leadership Assessment:

• Have the founders done this before?
• Do they have relevant domain expertise?
• Do they work well together?
• Can they recruit and retain talent?

Questions to ask:

• Tell me about the founding team's background
• How did the founders meet?
• What's your experience in this space?
• What's your employee turnover rate?

Red flags:

• First-time founders with no advisors
• Co-founder conflicts or recent departures
• High employee turnover
• Toxic glassdoor reviews
• Leaders who are defensive or arrogant

Green flags:

• Complementary skill sets
• Relevant experience
• Strong team culture
• Low turnover
• Impressive early hires

5. Investors

Who's backing them and why?

Questions to ask:

• Who are your investors?
• Why did they invest?
• How involved are they?
• Do they have relevant portfolio companies?

Research their investors:

• Check their portfolio and track record
• Read their investment theses
• Look for relevant domain expertise
• Understand their reputation

Red flags:

• Unknown or inexperienced investors
• Investors known for poor founder support
• No name-brand investors after Series A
• Difficult investor terms

Green flags:

• Reputable VCs with track record
• Investors who add value beyond capital
• Strong syndicate of investors
• Investors with relevant expertise

6. Competition

Can they win?

Questions to ask:

• Who are your main competitors?
• What's your differentiation?
• What's your sustainable competitive advantage?
• How do you win deals against competitors?

Do your own research:

• Google the space
• Check similar products
• Read analyst reports
• Talk to potential customers

Red flags:

• Unaware of competition
• No clear differentiation
• Competing on price alone
• Dismissive of competitors

Green flags:

• Clear competitive advantages
• Unique insight or technology
• Defensible moat
• Winning deals consistently

7. Engineering

What will you actually work on?

Questions to ask:

• What's the tech stack?
• What's the engineering culture like?
• What's your approach to technical debt?
• How do you make technical decisions?
• What does the team need most?

Assess the codebase (if possible):

• Ask to see code samples
• Review their open source contributions
• Check engineering blog posts
• Look at product quality

Red flags:

• Unmaintainable legacy code
• No automated testing
• Frequent outages
• Engineers unhappy (check Blind)
• No clear technical vision

Green flags:

• Modern, maintainable tech stack
• Good engineering practices
• Technical co-founder or strong CTO
• Engineers excited about the work
• Clear technical roadmap

8. Culture and Values

Will you enjoy working here?

Questions to ask:

• What are your company values?
• How do you live those values?
• What's your approach to work-life balance?
• How do you handle disagreements?
• What does success look like for this role?

Observe during interviews:

• How do people interact?
• Are interviewers prepared and respectful?
• Do they ask good questions?
• Do they listen to your answers?

Red flags:

• Values feel generic or forced
• "We work hard and play hard"
• Everyone works crazy hours
• High-pressure interview tactics
• Interviewers seem burnt out

Green flags:

• Authentic, specific values
• Sustainable work practices
• Respectful interview process
• People seem genuinely happy
• Clear communication

How to Do the Research

1. Talk to Current Employees

Find people on LinkedIn and reach out:

• What do they love about working there?
• What frustrates them?
• How has the company changed?
• Would they join again knowing what they know?

Be respectful of their time. Buy them coffee or lunch.

2. Talk to Former Employees

Even more valuable because they can be more honest:

• Why did they leave?
• What did they learn?
• What would they change?
• Would they recommend joining?

Find them on LinkedIn or Blind.

3. Check Online Resources

Glassdoor:

• Employee reviews
• Interview experiences
• Salary data

Blind:

• Anonymous employee discussions
• More honest (sometimes brutally so)
• Good for compensation data

Levels.fyi:

• Compensation benchmarks
• Company-specific data

Crunchbase:

• Funding history
• Investor information
• Leadership team

LinkedIn:

• Employee count and growth
• Hiring trends
• Who's joining and leaving

4. Talk to Customers

If possible, talk to people who use the product:

• What do they love?
• What frustrates them?
• Would they recommend it?
• What alternatives did they consider?

5. Try the Product

Use the product yourself:

• Is it well-built?
• Does it solve the problem?
• Would you pay for it?
• What's the competition like?

Red Flags That Should Make You Run

Immediate disqualifiers:

• Founders won't answer basic questions
• Less than 6 months of runway
• Toxic culture evident in interviews
• High turnover of senior leaders
• Unethical business practices
• Defensive or dishonest responses

Green Flags That Are Great Signs

Strong signals:

• Impressive, mission-driven team
• Strong product-market fit signals
• Clear competitive advantages
• Well-capitalized with good investors
• Sustainable, healthy culture
• Transparent and honest communication

Making the Final Decision

Consider the whole package:

Risk Assessment:

• What's the probability of success?
• What happens if it fails?
• How does this fit your career goals?

Opportunity Assessment:

• What will you learn?
• Who will you work with?
• What's the upside if it works?

Personal Fit:

• Do you believe in the mission?
• Do you like the team?
• Is the culture aligned with your values?

Questions to Ask Yourself

Before accepting:

1. Do I believe in this product and team?
2. Can I afford the risk?
3. What's my backup plan if this fails?
4. Will I learn and grow here?
5. Are the people impressive and kind?
6. Am I excited about the work?
7. Does the compensation make sense?

If you can't answer these confidently, keep investigating or keep looking.

Final Thoughts

Joining a startup is a big bet. Do your homework. Ask hard questions. Trust your instincts.

The best startups are transparent and welcome your diligence. If a company gets defensive about basic questions, that's your answer.

Remember: You're interviewing them as much as they're interviewing you.

Looking for pre-vetted startups with strong fundamentals? Forecareer only partners with startups that pass our due diligence. Let's find you a winner.