Tech Referent

Sr. Java Engineer - Technical Referent

About Promtior

Promtior is at the forefront of the Agentic AI revolution, delivering cutting-edge solutions that transform businesses across industries — bridging technology and people to turn AI into a real competitive advantage. Since 2023, we’ve helped organizations boost operational efficiency through tailored Agentic AI solutions, from discovery and development to full implementation, across three core lines: AI Product Delivery (predictive analytics, intelligent automation, AI-driven chatbots, image processing), AI Department as a Service (LATAM-based teams that integrate directly with our clients’ teams), and AI Adoption Consulting (helping companies find and act on AI opportunities across their business).

We’re a team held together by genuine relationships, constant exchange, and shared learning. We believe innovation happens when people feel included and collaborate with purpose, and we aim for professional growth to go hand in hand with personal well-being.

About the Role

We’re looking for a Sr. Java Engineer to join our Engineering team as a Technical Referent, working embedded with a global fintech client in its Payment Data Security team. This is a senior, hands-on technical role one level above Senior Software Engineer: you won’t wait for tickets to be assigned, you will spot problems, propose improvements and generate your own work. It is a technical leadership position with no direct reports, where you will be the reference engineers turn to for architecture and design decisions.

Key Responsibilities

You will take product needs and turn them into technical solutions: when a business problem arrives, you will analyze it, design the architecture that fits the existing platform, and drive the solution end to end. You will pay close attention to how systems communicate and where they can fail, anticipating needs such as caching, rate limiting, authentication and security from the design stage rather than discovering them in production.

You will work on backend services in Java within a microservices architecture running on AWS, reviewing a high volume of code in a team that relies heavily on AI-assisted development. You will manage several workstreams in parallel, organizing smaller initiatives and switching context effectively, acting more as the owner of a scope than as the executor of individual tasks.

You will act as a technical reference for engineers inside and outside your team: guiding design decisions, influencing and aligning others around a technical vision, and occasionally supporting other teams in the same vertical with code reviews and technical analysis. You will coordinate cross-team solutions with people from different countries, so you will communicate daily in English. You will also stay curious about the business, asking why things are built and which metrics and KPIs measure their impact.

Required Experience

• Expert-level Java (ideally recent versions such as Java 21+), with the depth to review large amounts of code critically.

• Strong system design skills: service communication, caching, rate limiting, authentication, security and failure modes in distributed systems.

• Solid experience with microservices and cloud-based architectures, ideally on AWS.

• Proven ability to translate product or business problems into technical solutions and architecture.

• Strong, day-to-day use of AI tools in the software development workflow.

• High autonomy and proactivity, with the ability to manage several workstreams and context switches at once.

• Technical leadership skills: mentoring engineers and influencing decisions without formal authority.

• Business and product curiosity: understanding the why behind the work and the metrics that measure it.

• Advanced English Level (mandatory), with clear communication across international teams.

Especially Valued

• Experience with Go (Golang).

• Interest in or hands-on exposure to Rust.

• Prior experience as Technical Referent, Tech Lead or Architect.

• Experience working with security-sensitive systems such as payments, authentication or data protection.

Benefits

• 20 paid days off per year.

• Hybrid work model.

• Flex Days: monthly team activities.

• Professional development courses.

• Internal clubs (soccer, padel, running, cinema).

Location

Montevideo, Uruguay. Buenos Aires, Córdoba, Corrientes or Chaco, Argentina.

· Hybrid work arrangement