Solution Architect

21 hours ago

Belgrade, Central Serbia Unlimit Full time €80,000 - €120,000 per year
About Unlimit   Unlimit is the global fintech powerhouse behind the world's largest proprietary payments infrastructure. Founded in 2009, Unlimit operates across 17 global offices with 700+ experts, seamlessly integrating 1,000+ payment methods into a single platform. From London to São Paulo, we empower businesses to scale across borders with a unified suite of financial tools — including payment processing, alternative payment methods, multicurrency business accounts, card issuing, banking-as-a-service, and crypto on- and off-ramps. Our mission is to break down financial barriers and enable seamless money movement across borders. We give forward-thinking businesses the tools to accept, send, and manage payments effortlessly, wherever they operate.

About the Role
Unlimit is undergoing a deep technology transformation. As a global fintech with a robust suite of products — including card acquiring, banking-as-a-service, payment gateways, crypto solutions, and wallets — we're rebuilding our core backend platforms to be AI-native, modular, and cloud-agnostic. We're seeking a forward-thinking and hands-on Solution Architect to lead this transformation from within. This is a strategic yet execution-driven role: you'll help define and implement next-generation architecture that's scalable, resilient, and designed with real-time AI capabilities. You'll work at the intersection of architecture, infrastructure, and delivery, collaborating closely with Product, DevOps, Engineering, and Data teams. Your work will directly shape systems that serve thousands of merchants globally — with near-zero downtime, built-in observability, and seamless integration of AI agents into critical paths. This is a rare opportunity to join Unlimit at a pivotal point and define the future of financial infrastructure. What You'll Be Doing
  • Take ownership of solution design for backend systems powering payment products (card acquiring, wallets, crypto, BaaS).
  • Design and maintain architecture that is AI-native and cloud-agnostic, aligned with modern security, scalability, and compliance standards.
  • Partner with product managers, engineering leads, QA, and analysts to translate business needs into modular architectural designs.
  • Build out documentation, high-level solution diagrams, system interface contracts, and component-level specifications.
  • Act as a key contributor to API design and service decomposition efforts.
  • Guide cloud migration and infrastructure evolution (AWS-based stack, with Kubernetes, GitLab CI/CD, Terraform).
  • Ensure systems enable zero-downtime deployments, automated rollbacks, and scalable horizontal patterns.
  • Conduct architectural reviews, technical assessments, and work closely with delivery teams to implement designs.
  • Act as a thought leader and "tech compass" across engineering functions, driving architectural maturity and platform modernization.
  • Proactively identify technical debt and long-term design risks; propose mitigation strategies.
What We're Looking For
  • 6+ years in architecture roles, ideally in fintech or high-availability distributed systems
  • Proven experience designing scalable backends in AWS or hybrid cloud environments
  • Hands-on background in backend development, DevOps, or cloud infrastructure (Java, Go, Python preferred)
  • Deep understanding of event-driven systems, microservices, CI/CD, observability (Grafana, Prometheus)
  • Experience with Kubernetes, Terraform, and GitLab CI/CD is strongly preferred
  • Previous work with AI/ML pipelines, AI agent integration, or MLOps is a strong plus
  • Experience in financial services, payment gateways, acquiring, or digital wallets is a bonus
  • Strong stakeholder communication and experience driving system design reviews across teams
  • Comfortable working in fast-paced, cross-functional environments (LATAM, EU, and APAC teams)
What You'll Gain
  • A unique opportunity to drive AI-native backend transformation at scale
  • Exposure to the full fintech product landscape: card processing, crypto, wallets, BaaS
  • Work in a global company with a strong engineering culture, agile mindset, and flat hierarchy
  • Collaborate with international teams that deeply value architecture, resilience, and innovation
  • Strong support for async cross-timezone collaboration
Join Unlimit Team now
Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

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