For Venture Capital firms.
Technology insight across the full venture lifecycle, from pre-investment screening to portfolio value creation, wherever in Europe the company sits.
Stage-Appropriate Technology Assessment
Seed & Pre-Seed
Targeted review of founding team capability, architecture direction, and technical debt trajectory. Priced for early-stage economics, delivered across any European jurisdiction.
Series A
Two to three week assessment across all five pillars. Has the team built well enough to scale, and can the technology support growth across the markets the business plan targets?
Series B+
Full-depth due diligence equivalent to PE-style assessment. Operational maturity, team scaling, IP defensibility, and product-market fit, with explicit attention to cross-border regulatory posture.
The VC-Specific Challenge in European Markets
Most VC firms know technology assessment matters but lack the in-house capability. The typical approach, asking a portfolio CTO to glance at the code or relying on the founding team's self-assessment, misses structural issues that experienced operators spot in hours. When the portfolio company sits in a different country from the fund, that gap widens further: regulatory expectations, engineering culture, and employment law all vary by jurisdiction.
Our model is built around venture realities: rapid turnaround, stage-appropriate expectations, portfolio-level support, and pricing that reflects earlier-stage economics. We operate across European VC ecosystems, from Berlin and Amsterdam to Stockholm, Dublin, Paris, and Helsinki, with the same depth and consistency. For PE-backed portfolio companies, we offer a more intensive model with dual reporting to operating partners. Our technology due diligence checklist gives a clear picture of what a thorough assessment covers across each of the five pillars.
What We Look For at Each Stage
Seed and Pre-Seed
At the earliest stage, there is often little to assess beyond the founding team and their initial technical decisions. But those decisions set the trajectory for everything that follows.
Technical founder capability. Can this team build what they claim? We assess capability not by reading CVs but by talking to founders about their decisions: why they chose this stack, how they thought about scalability, what trade-offs they made.
Architecture direction. Has the team made choices that will need unwinding at scale? A seed company on an exotic stack has constrained its hiring pool. A team running microservices with three engineers has created complexity that slows rather than speeds. When the company plans to hire across multiple European markets, technology choices that limit the talent pool matter even more.
Technical debt trajectory. Some debt at seed stage is expected. The question is whether the team understands the debt they carry and has a credible plan to address it. Unconscious debt, where the team does not realise they are making compromises, is far more concerning than deliberate trade-offs made for speed.
Series A
By Series A, the product exists and has traction. The question shifts from "can they build it?" to "have they built well enough to scale?"
Scalability architecture. Will the platform handle ten times the current load? We look not for perfection but for whether the path to the next order of magnitude is clear and achievable, including across multiple markets if the growth plan is international.
Team structure and leadership. Is the founding CTO still the right person to lead through the next phase? The skills that make an excellent founding engineer (hands-on coding, rapid prototyping) are not always those needed at twenty or fifty engineers. We assess this with diplomacy but without evasion.
Process maturity. A Series A company does not need enterprise-grade processes, but it needs foundations: proper branching, some automated testing, deployments that do not require the CTO to be awake. Without these by Series A, scaling will be painful.
Security and regulatory basics. If the company handles customer data across jurisdictions, fundamental practices should be in place: encryption at rest and in transit, basic access controls, awareness of data residency obligations, and an understanding of how GDPR is enforced differently by different national authorities. A company operating from Berlin with customers in France faces both the BfDI and the CNIL, even under the same regulation.
Series B and Beyond
At Series B, technology should be maturing towards operational standards. Our assessment approaches PE-style depth, because the company has had time and resources to build properly.
Operational maturity. Monitoring, alerting, incident response, disaster recovery. A Series B company should have these in place, not at enterprise grade, but with enough maturity to sustain the growth trajectory.
Team scaling. Has headcount growth outpaced process development? A team that went from five to thirty engineers in twelve months without investing in supporting processes and tooling will be slower at thirty than at ten. When that team spans offices in multiple countries, the effect is compounded. One of the most common patterns we see.
Product-market fit in the technology. By Series B, the architecture should reflect validated product-market fit, built around use cases customers actually value, not the assumptions of the original pitch deck.
IP and defensibility. For investments where technology is core to the thesis, we assess depth of IP: not just patents, but actual sophistication, difficulty of replication, and whether the technology creates a genuine moat versus a temporary feature advantage.
Portfolio Support Models
Shared Technology Partner
A senior CTO who serves as the fund's technology advisor across multiple portfolio companies, wherever they sit in Europe. Attends quarterly board meetings, reviews technology strategies, and provides ad-hoc advisory when portfolio companies face technology decisions or challenges.
Portfolio-Wide Initiatives
Programmes that benefit multiple portfolio companies simultaneously: AI strategy sessions, technology leadership workshops, and cross-portfolio events that provide practical insights and give the fund visibility into technology maturity across its European investments.
On-Demand Advisory
A retained relationship that gives the firm priority access to our partners for deal assessment, portfolio questions, and technology decisions. The retainer ensures availability; the billing reflects actual usage.
How We Support VC Portfolios Across Borders
Portfolio-wide advisory. What often begins as individual due diligence engagements evolves into portfolio-level support: AI readiness sessions for portfolio companies, attendance at internal partner days, and ongoing technology advisory across deal flow. When portfolio companies need hands-on technology leadership, our fractional CTO services for PE and VC provide embedded operational support calibrated to investment timelines. Every engagement concludes with our Rational Closedown, a structured handover that ensures continuity whether the company is hiring a permanent CTO or preparing for exit.
Founder development. We deliver sessions to CEOs and heads of development covering technology leadership, team scaling, and AI strategy. Practical frameworks and decision tools, not theoretical presentations. These work particularly well when delivered across a portfolio, so founders in different markets can learn from one another's challenges.
Due diligence that informs decisions. Our assessments provide clear, comprehensive feedback on technology and engineering teams, with findings that feed directly into investment decisions. Whether the target sits in the Nordics, the Benelux, Southern Europe, or the UK, we deliver findings in a consistent format that investment committees can compare.
Engagement Models and Pricing
Stage-Appropriate Pricing
Seed/Pre-Seed validation: Two-day targeted assessment of team capability, architecture direction, and technical debt trajectory. Priced to reflect the lighter-touch engagement.
Series A due diligence: Two to three week assessment across all five pillars, calibrated for stage. Comprehensive enough to surface material risks, pragmatic enough to acknowledge that not everything will be in place.
Series B+ due diligence: Full-depth assessment equivalent to PE-style DD, four to six weeks, with detailed reporting and a value creation roadmap. Where the portfolio company operates across jurisdictions, we include explicit regulatory and data residency commentary.
Portfolio Pricing
For firms that engage us across multiple deals or for portfolio-wide support, we offer portfolio pricing, from retainer arrangements for on-demand advisory to annual contracts for periodic reviews. Designed to make professional technology assessment practical across your deal flow, not just for your largest bets. Portfolio pricing is denominated in EUR.
Delivery Format
VC firms do not always need the formal documentation that PE firms require. For earlier-stage deals, we often deliver through structured verbal briefings with supporting materials, faster, more cost-effective, and for many partners more useful than a fifty-page document. For larger deals or investment committee requirements, we produce the same comprehensive reports we deliver for PE clients.
What You Get
Stage-Calibrated Assessment
Findings benchmarked against what good looks like at your company's specific stage, not generic enterprise standards.
Risk Register
Prioritised technology risks with severity ratings, commercial implications, and remediation estimates.
Team Evaluation
Honest assessment of founding team capability and whether leadership is right for the next phase of growth.
Scaling Roadmap
Practical recommendations for the technology investments needed to support the growth thesis, including cross-border scaling considerations.
Verbal or Written Briefing
Delivered in the format that works for you, structured conversation or formal report for IC papers.
Client Testimonials
"Rational Partners have been fantastic in giving us insight into the portfolio, as well as stepping in to a number of fractional roles to add a lot of value and stability."
"We're very happy with the support we got from Rob and his team in diligencing an investment opportunity. They were very responsive, giving clear and comprehensive feedback on the company's technology and engineering team."
Frequently Asked Questions
Whether you are running pre-deal DD on a target in another European market, building portfolio support across jurisdictions, or need a technology perspective on your cross-border deal flow, speak to a partner who has been on both sides of the table.