Anastasios
Krikonis
Scalable Fintech & IoT Platforms | React, React Native, Node.js | Driving Revenue Growth through Technical Excellence
About
Senior Software Engineer with 7+ years of engineering experience and 13+ years in professional roles spanning tech and business operations. I build production-grade web and mobile applications that drive measurable business growth, specializing in the JavaScript and TypeScript ecosystems where reliability and scalability are non-negotiable.
What sets me apart is a rare combination: I've managed P&Ls, led teams, and optimized operations across multiple countries before writing my first line of production code. That business DNA means I don't just ship features — I understand unit economics, conversion funnels, and what makes a product succeed. I take full ownership from architecture to production, with automated CI/CD and end-to-end observability.
Core Impact
Fintech Excellence: Owned Bitvavo's end-to-end onboarding journey, leading A/B experimentation that increased first-trade conversions by 4% — directly impacting revenue.
Architectural Leadership: Architected real-time communication layers at Gamgee and led development of IoT smart router control apps serving thousands of users.
Full-Cycle Ownership: From initial architecture to stable production — I bridge technical decisions with user needs, shipping systems backed by CI/CD and observability.
“Engineer with a business mind. Builder by nature.”
Experience
Lead Software Engineer
The New Black
- Leading mobile development efforts, driving architecture decisions and team collaboration for a new product.
Senior Software Engineer
Bitvavo BV
- Owned the end-to-end onboarding journey (account creation → KYC → first trade) for a high-volume crypto exchange, balancing regulatory compliance with conversion-focused UX.
- Led A/B experimentation across onboarding flows, increasing first-trade conversion by 4% and driving measurable revenue uplift.
- Built onboarding observability dashboards and alerting systems, reducing incident response time and improving reliability.
- Partnered with compliance, product, and engineering to translate evolving regulatory requirements into scalable technical solutions without degrading UX.
Software Engineer
Gamgee BV
- Led development of a React Native smart router control app, implementing scalable state management with Redux-Saga.
- Architected real-time communication layer using WebSockets and REST APIs, reducing device response latency and improving reliability of remote router management.
- Built internal Python services for router testing and automation, improving QA reliability and reducing manual testing overhead.
- Streamlined development process by implementing CI/CD pipelines using Jenkins.
- Developed and integrated a payment system for VPN and app subscriptions using Revenue Cat, facilitating seamless in-app purchases and subscription management.
Software Engineer
Rebelslab BV
- Contributed to developing a MaaS (Mobility as a Service) solution app for a major public transportation company.
- Translated UX wireframes and mockups into interactive features using JavaScript and React Native, ensuring a superior user experience.
- Refactored and enhanced legacy React Native codebase, introducing Redux-based state management to improve scalability and maintainability.
Operations & Store Manager
Crepe Restaurants
- Managed daily operations for multiple retail locations across Greece and the Netherlands, overseeing staff, inventory, suppliers, and financial performance.
- Developed strong skills in process optimization, team leadership, problem solving, and data-driven decision making — skills that later became the foundation of an engineering career.
Skills
Front-End
Back-End & Testing
Infrastructure
Projects
CountryQuest
An interactive geography quiz app that challenges users to explore and learn about countries around the world.
Voltchek
A utility app for monitoring and checking electrical voltage and power consumption metrics.
TireSpy
A smart tire monitoring application for tracking tire health, wear patterns, and maintenance schedules.
Oros Ensemble
A website for Oros Ensemble, a musical group showcasing their performances and events.
Vaso's Kitchen
A recipe blog featuring curated home-cooked dishes with step-by-step cooking instructions.
Contact
Let's Connect.
Always open to discussing new projects, creative ideas, or opportunities to be part of something great.