Senior IT Solutions Architect – Mobile & Cloud Banking

Expected, Kubernetes, C4, UML, Java, Kotlin, Git, Swift Operating system, Windows, Linux About the project, Our client is Poland’s largest financial institution and a market leader in digital banking, delivering cutting-edge services to millions of active daily users., , Please note: Optiveum is acting as the recruitment partner for this role. You will sign a long-term B2B contract directly with a reputable IT outsourcing company, dedicating your expertise full-time to this Bank's technological transformation., , About the Role, We are seeking a Senior IT Solutions Architect to co-define the target architecture for Poland’s premier mobile banking ecosystem. Operating at the intersection of product and platform engineering (50/50 split), you will design microservices-based, distributed, and cloud-native solutions designed to handle high-concurrency traffic with near 100% availability. This is how we work, at the client's site, you focus on a single project at a time, you develop several projects simultaneously, you have influence on the product, you focus on product development, you focus on code maintenance, agile, scrum Your responsibilities, Architect High-Scale Systems: Design complex, distributed software architecture and system integrations for high-volume mobile banking services., Bridge Platform & Product: Split your focus 50/50 between driving core Tech Platform architecture in the Foundation team and supporting dedicated domain product teams., Define Engineering Standards: Establish requirements for hardware, infrastructure, tech stack, service orchestration, and software development best practices., Integrate & Document: Model system integrations (C4/UML) and maintain complete, high-quality architectural documentation., Ensure Security & Performance: Partner with cybersecurity experts on access layers, OAuth 2.0/OIDC implementations, and cryptographic standards., Drive Data-Backed Decisions: Independently gather technical domain context across the organization to recommend and implement architectural optimizations. Experience: 5+ years in IT solution architecture and complex system integrations., Domain Knowledge: Proven track record in designing architecture for mobile applications and high-availability, high-concurrency systems in the financial sector., Modern Stack & Practices: Practical experience with microservices architecture, Kubernetes (k8s) orchestration, containerization, and cloud CI/CD delivery pipelines., Platform Engineering: Solid grasp of domain-driven platform teams supporting product engineering teams., Security & Auth: Strong understanding of authentication/authorization protocols (OAuth 2.0, OIDC) and cryptography (digital signatures, PKI, encryption)., Code & Modeling: Hands-on ability to model in C4/UML, read/analyze code in Java, Kotlin, or Swift, and work with Git., Education & Languages: Higher degree in Computer Science (or related) and fluency in reading technical documentation in English. What we offer, Salary: 180 – 190 PLN/h net + VAT (B2B contract, depending on experience)., Work Model: Hybrid (minimum 2 days/month in the Warsaw office)., Contract Duration: 6–12 months (with a high probability of long-term extension)., Location: Warsaw, Poland., Impact & Scale: Direct influence on an application powering the daily financial transactions of millions of users using a modern tech stack. This is how we work on a project, architect / technical leader support, Continuous Deployment, Continuous Integration, team-level deployment, documentation, issue tracking tools, testing environments Benefits, remote work opportunities, integration events OPTIVEUM SPÓŁKA Z OGRANICZONĄ ODPOWIEDZIALNOŚCIĄ, Optiveum is a recruitment and consulting company created based on our 20-plus years of experience in HR & IT services., , We work for Clients located in Poland and abroad providing our local and international Candidates with Project-based or Permanent job opportunities in a remote or office-based model. This is how we work,