Senior Frontend Engineer (Payments)

Location: On-site in Belgrade or Lisbon

Company

hirify.global provides commerce, liveops automation, community engagement, and payments infrastructure for video game studios, helping them build direct relationships with players and sell directly.

What you will do

• Build and evolve the Checkout experience for mobile game purchases.
• Add payment flows, payment methods, and third-party SDK integrations.
• Develop fast, mobile-first interfaces for browsers, WebViews, and in-app browsers, including low-end devices and slow networks.
• Improve performance and stability by identifying bottlenecks and fixing issues in key payment flows.
• Use product data and experiments to reduce Checkout friction and improve conversion.
• Investigate production issues with logs, traces, events, and metrics, collaborating with APIs and backend services when needed.

Requirements

• 5+ years of professional frontend development experience.
• Strong TypeScript and React skills.
• Strong understanding of browsers, networking, and mobile web.
• Experience improving web performance, including FCP, LCP, profiling, bundle size, and resource loading.
• Experience building payment or transactional flows such as checkout, subscriptions, wallets, or payment SDK integrations.
• Strong debugging skills and ownership of implementation, release, and stable production operation.

Nice to have

• Experience in fintech, payments, e-commerce, gaming, or consumer products with a large mobile audience.
• Knowledge of 3DS, payment statuses, saved payment methods, declines, and refunds.
• Understanding of frontend security, including CSP, iframe security, and PCI scope.
• Ability to read Go or Python and understand backend logic and APIs.
• Experience using AI tools in day-to-day development.

Culture & Benefits

• Work alongside experienced professionals across global locations.
• High-growth environment with fast product delivery and significant product impact.
• Autonomy, ownership, and decision-making responsibility.
• Access to modern tools, automation, and AI-assisted development.
• Equity participation in the company’s growth and long-term success.