MARCOSMONTERO
Head of Engineering • Founding Engineer
Architecting high-fidelity digital systems from first principles.
As Head of Engineering and Founding Engineer at Fynza, I am architecting the financial backbone of the Experience industry — designing the 0→1 fintech infrastructure that translates booking data into liquidity for Tour Operators across global Booking Systems and OTAs, built on AWS CDK, Turborepo, tRPC, and Prisma at a scale engineered for millions in transaction volume.
My specialty is forging robust digital foundations from scratch, a capability previously proven as Founding Tech Lead at Enso Coliving, where I unified a fragmented legacy stack into a single PropTech engine and enabled a €30,000/month recurring revenue launch within the first 30 days — ensuring immediate and quantifiable ROI.
Beyond technical leadership, my approach is shaped by a fascination for traveling and exploring diverse cultures, broadening my perspective on global technology interaction and fostering unique problem-solving insights. You can explore my selected work and side projects in my portfolio. I also write about these intersections on my blog, where I share technical and personal reflections from my engineering journey.
The Edge
Strategic Systems Design
My technical leadership goes beyond the conventional; it is a synthesis of strategic vision and an insatiable curiosity for interconnecting ideas across domains. I lead the formation and mentoring of teams, and the cohesion of complex technological environments, building robust digital foundations prepared for the future.
Precise Intelligence & Creative Resolution
My Mensa membership, combined with deep strategic vision, amplifies my innate ability for pattern recognition. This allows me to unravel the essence of problems with exceptional clarity, identifying optimal routes and truly unexpected solutions where others only perceive obstacles.
Signal Optimization & User Fidelity
My training in Sound Engineering instilled an unbreakable perspective: an obsession with reducing noise and amplifying the signal. I apply this philosophy to product development, where every component and interaction is optimized to maximize clarity, performance, and user experience.
High-Velocity 0→1 & Foundational Impact
My specialty is leadership in orchestrating uncertainty: transforming an embryonic idea into a robust and scalable infrastructure in record time, from MVP to enterprise level. As a former CTO and Founding Tech Lead, I build the digital foundations that ensure immediate and quantifiable impact.
Fynza
Head of Engineering · Founding Engineer
First engineering hire at a fintech building the financial backbone of the Experience industry. Architecting a 0→1 platform that translates booking data into liquidity for Tour Operators across FareHarbor, Ventrata, Viator, and GetYourGuide.
- Designed a proprietary Adapter layer aggregating global Booking Systems and OTAs into a canonical source of truth for risk evaluation.
- Spearheaded a Turborepo + AWS CDK (IaC) + tRPC + Prisma stack engineered for millions in transaction volume.
- Establishing SOC2 / ISO 27001 technical readiness and leading a specialized external engineering team.
Enso Coliving
Founding Tech Lead / Architect
Replacing a legacy fragmented tech stack, I architected a unified PropTech engine that handled property management, payments, and user verification in a single flow.
- Enabled €30k/month revenue launch within 30 days of rollout.
- Architected a scalable Supabase + Next.js infrastructure supporting rapid expansion.
- Implemented a high-conversion qualifying flow reducing manual ops by 70%.
Mindera
Senior Frontend Architect
Led the digital transformation of enterprise-scale legacy systems into modern React architectures, serving millions of users across international markets.
- Architected the migration of legacy monolithic infrastructures to modern React + TypeScript stacks.
- Drove mobile innovation by leading React Native adoption for strategic client products.
- Established high-standard CI/CD pipelines and component libraries used across multiple global teams.
Nomoko
Senior Frontend Engineer
Pioneered high-performance 3D visualization layers for urban digital twins. Optimized Three.js rendering pipelines to handle massive datasets on the browser.
- Architected 3D visualization layers using Three.js and React Three Fiber.
- Optimized rendering pipelines for large-scale urban spatial data.
- Improved mobile performance by 40% through custom shader optimization.
Cesce
Software Engineer
Developed secure and regulatory-compliant financial interfaces for one of Spain's leading credit insurance agencies.
- Built mission-critical fintech modules with a focus on data integrity and security.
- Collaborated on the modernization of internal risk assessment tools.
- Integrated complex financial APIs with real-time validation layers.
Engineering Philosophy
Code as a Liability
Every line of code is a maintenance burden. I optimize for deletions and lean architectures that prioritize business agility over technical vanity. Simplicity is the ultimate sophistication.
User-Centric Rigor
Performance isn't just a metric; it's respect for the user's time. I build systems that feel instant and reliable under any load, with a focus on perceived performance and accessibility.
