Staff Software Engineer - Payments Gateway

About the role

Nu is one of the largest digital financial platforms in the world, with more than 127 million customers across Brazil, Mexico, and Colombia. Guided by our mission to fight complexity and empower people, we are redefining financial services in Latin America and beyond - and this is still just the beginning of the purple future we're building. We combine proprietary technology, data intelligence, and an efficient operating model to deliver financial products that are simple, accessible, and human. Our impact has been recognized by global rankings such as Time 100 Companies, Fast Company's Most Innovative Companies, and Forbes World's Best Bank. Learn more at: https://international.nubank.com.br/careers/ You will join the engineering group behind Nubank's Acquiring solutions, as Tap to Pay (TAP) experiences - turning phones and dedicated terminals into secure, reliable payment devices for our merchants. As a Staff Software Engineer - Payments Platform, you will lead the design and implementation of our systems for authorization, clearing and settlement Today we rely heavily on partners (e.g., Zoop); our strategic direction is to verticalize : building our own Payments SDKs and gateway to reduce dependency, gain end-to-end observability, and control core parts of the merchant experience. This is a high-impact role : you will both build critical gateway components and act as a key knowledge source on payments protocols and acquiring, seeding expertise across multiple squads (TAP, Acquiring platforms) over a 3-5 year roadmap. You'll be responsible for Designing and building Nubank's payments gateway backend that processes POS and Tap to Pay transactions after they leave the terminal, acting as the core authorization and routing layer between our devices and external acquirers/partners. Verticalizing partner-provided capabilities by developing our own Payment SDK and gateway , reducing reliance on third parties for transaction processing and improving observability, stability and control over the end-to-end flow. Designing architecture for constrained Payment environments , collaborating with embedded/mobile teams to account for hardware peripherals (NFC, EMV readers, printers), offline/latency-sensitive flows, and tight data-plan limits on terminals. Acting as a technical bridge between our acquiring solutions , ensuring both surfaces share a robust, scalable core transaction processing flow while serving different form factors and partners. Integrating with acquirers and networks , designing robust flows for authorizations, settlements and error handling, and progressively increasing our ownership of these interactions. Leading long-term platform design (3-5 years) for acquiring and gateway, ensuring we build scalable, reusable components instead of point solutions, and that we can support new products and geographies over time. Seeding and multiplying domain knowledge : running whiteboard sessions, design reviews and knowledge-sharing routines so that other backend engineers can learn POS/acquiring patterns and contribute effectively. Collaborating with external experts and partners , representing Nubank in technical discussions with vendor and acquirer engineering teams, and shaping agreements and interfaces that allow our platform to scale cleanly. We are looking for a person who has Required Staff-level backend engineering experience (or equivalent) designing and operating high-scale, mission-critical systems. Strong background in payments / POS / acquiring backends, with experience in transaction processing and connectivity with acquirers and/or payment networks. Hands-on experience with ISO 8583 (or very similar card-payment protocols) and the surrounding concepts (authorization flows, reversals, settlement, offline/queued transactions). Experience working with or alongside POS / embedded / payments hardware teams, understanding constraints around peripherals, connectivity, offline behavior and latency. Proven track record designing and evolving gateways or switches that connect to multiple acquirers or processors. Ability to operate as a technical leader and knowledge-multiplier : mentoring senior engineers, running structured design sessions and defining long-term technical direction. Strong communication skills and resilience : comfortable dealing with incidents, complex cross-team situations and external stakeholders, and able to keep discussions productive under pressure. Proven experience with PCI DSS v4.0 compliance standards, with the ability to design architectures that ensure secure isolation of the CDE (Cardholder Data Environment) and meet payment data security requirements. Comfort working in a hybrid model in Brazil (São Paulo or Belo Horizonte ) collaborating in English and Portuguese across local and global teams.

Requirements

• Experience at companies that have internalized POS/acquiring stack

Additional Information

Staff Software Engineer - Payments Gateway

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