Founder-minded engineering leader with 15+ years building products and teams from 0 to 1 — twice as seed-stage CTO, and across fintech companies that collectively serve hundreds of thousands of merchants. Deep expertise in payment infrastructure, mobile and web SDKs, and cloud architecture. Proven track record scaling teams of up to 30 engineers through B2C-to-B2B pivots, rapid international expansion, and cross-functional organisational change. Active international speaker and community builder across the functional programming and payments ecosystems.
Leading the Acceptance Experience Team at a Series B payments company, owning the full mobile and web SDK surface that powers checkout for merchants globally. 9 direct reports across iOS, Android, and Web, operating across mobile and web platform guilds.
Leading the Ecommerce Team (8 direct reports), responsible for client facing Online Booking, Retail, Voucher services and Branded Apps in Phorest Salon Software - a major Beauty industry SAAS product
Built and shipped a knowledge management product from zero, owning the full technical remit alongside co-founder responsibilities: product strategy, fundraising conversations, headcount planning, and direct customer engagement.
Operations and Architecture for CleverGift platform
Technical leader for payments software toolkits serving fintech clients including CleverCards and EuroSEPA. Responsible for system architecture, high-availability design, and whitelabel product strategy. Led a team of up to 4 engineers.
Founded and led software technology consultancy providing senior engineering leadership to fintech, healthtech, and financial services clients. Managed end-to-end client relationships from discovery through delivery.
Seed-stage CTO leading the technical transformation from a direct B2C consumer product to a B2B self-serve platform. Reported directly to CEO, co-owned the product roadmap alongside CPO, and participated in business and investor meetings. Led a team of 4 engineers.
Leading the project to deliver Pin+ - state of the art Chip and PIN solution for SMBs. Working with hardware engineering closely in the integration phase of Pin+ to bring it into production. Turning the product from early prototype phase into production ready state. Creating a delivery focused culture and advocate continuous delivery. Support the device and system certification process: GICC - EMV payments, MTIP - MasterCard, ADTV - Visa, Visa Live tests.
Built the Dublin Software Team from 0 to 15 engineers at SumUp's inception. Working directly with SumUp's founders, designed and delivered the core API and surrounding platform. Led the team to launch self-serve merchant sign-ups across 10 countries within the first year, going from 0 to hundreds of active merchants. Working closely with SysOps on bootstrapping deployment processes. Delivered and maintained internal admin interface for Customer Service, Payment Operations, and AML.
Created DSL to describe onboarding flows that can be controlled from the backend on all signup channels (web, iOS, Android). Creating early prototypes for our award winning 'customer app' proof of concept. Creating the SumUp app-switch API. Receipt delivery and printing R&D.
Creating critical features for the business working on Hostelworld's flagship site and internal admin. Conduct the migration from Bugzilla to Jira. Exploring and advocating new ways of enhancing the delivery tools used. Piloting agile workflows with key members of the organisation.
Enhancing our mobile presense on dedicated site and mobile app. Conduct code migration from JS to CoffeeScript. Delivering v1.0 of our cross platform mobile app on iOS and Android using the mobile site as a base. Reorganise the backend APIs used for mobile and external services for payments, bookings and account details.
Delivered and supported over 50 projects of various complexity, all of which were mission critical for the business. Most notable ones include: Single click deposit, Cancel withrawal, Targeted marketing messages, Flexible player limits. Designed and delivered analytics and monitoring tools for our production systems. Slimmed down our deployment process from a 25-step list into a single click solution.
Helping small businesses with invoicing and accounting solutions. Web solutions consulting for small businesses (HTML, PHP, Javascript, web hosting)
Organizer of Erlang & Elixir meetup, Dublin
Co-Host of Functional Kubs, Dublin
Coach @ Rails Girls, Galway & Dublin
Graduate coach @ Progmasters, Budapest
Don't let it crash! - Erlang OTP workshop, CodeMesh, London
Building the largest payment sandbox on a tiny machine, CUFP
Building resilient systems for high traffic - Erlang OTP workshop, Big Data Vilnius
Elixir on its best behaviour - workshop, ElixirConf EU
Elixir Katas workshop & "Managing High Load on Low Budget" presentation, Big Data Moscow
Elixir Katas workshop, CodeMesh
BSc in Computer Science, Eötvös Loránd University, Faculty of Informatics, Budapest
Leadership: Team building & hiring, engineering culture, IC growth & mentorship, cross-functional influence, headcount planning, seed-stage 0→1, team topologies
Domain: Payments infrastructure, mobile & web SDKs (iOS, Android, Web), cloud architecture & DevOps, high-availability systems
Technical: Elixir, Erlang, Ruby, JavaScript, React, PostgreSQL, AWS, Azure, Python
Methods: Agile, Kanban, CI/CD, TDD, incident management, engineering metrics