The founders' growth partner.
At BORRN, we bring the expertise founders need, before Series B, but can’t afford full-time.
The heartbeat of our offering: deep expertise, be it functional or in a given industry, delivered with flexibility, helping founders move faster and more efficiently without losing control.
The most impactful growth comes when founders can access specialized expertise—just enough to break through barriers but not so much that it disrupts their vision. Early stage founders, don't always need a full time team—they need the right team, at the right time. We offer them a closed network of in-house experts and collaborators, an exceptional mix with international expertise.
How we work
By the hour
Access our expertise when you need quick, specific and focused guidance.
By the day
Get fractional experts on a daily basis, to help you solve bigger challenges as you grow.
By the Sprint
Execute big parts of work with speed and efficiency, working with us on sprints.
(WORKED WITH)
Building in Sprints
We deal with bigger parts of work in Sprint mode.
A tailored, multidisciplinary team working alongside founding teams, tackling their most significant challenges or decisions head-on. Think of it as a short-term, high-impact team for startups.
Book experts by the hour/the day
By the hour
Sometimes, all it takes to overcome a challenge is a few hours of focused advice from someone who has seen it all before. Whether it's about a strategy pivot, product launch advise, or deep industry knowledge—our advising service allows you to meet with our team by the hour for immediate support.
By the day
For the founders who need ongoing support but don't have the resources for full-time hires, we offer part-time experts. These aren't just consultants—they're fractional members of their team, rolling up their sleeves and diving into their business as if it were their own.
How working together looks like.
Intro meeting
Get to know each other and discuss your needs.
First thoughts on challenge & Definition of Done
Outline the challenge and define success criteria.
Startup Assessment Process
Evaluate your startup's current state and potential.
Crafting the next day: Advising or Partnering or Building
Determine the best approach for your specific situation.
Delivery
Execute the plan and achieve results.
The founding team
Mathilda Nathan
Co-founder & CEO
Scale-up master, spending 12 years in the European start-up ecosystem. Business, Growth & Commercial @ Groupon, Deliveroo, Zego.
Costas Mantziaris
Co-founder
Six-time founder with a 20-year background in digital transformation and business growth. Co-founder of Reborrn and former Chief at Isobar & iProspect Greece, steering expertise towards groundbreaking investments.
Giorgos Vareloglou
Co-founder
Serial founder, and most recently co-founder of Reborrn, challenging how a modern consultancy should look in the 21st century. He is a seasoned storyteller and strategist, driven by change, people, and the digital economy.
The edge founders need.
Fast & Flexible
Quick execution with the agility to adapt as your business evolves.
Business & Creativity
Merging strategy and creativity to drive growth and engagement.
C-Level Expertise
Filling your C-suite gaps until your team is ready to take over.