Senior FullStack Engineer

Unleash innovation at the forefront of financial technology — shape the future of cloud-enabled enterprise solutions Krakow-based opportunity with hybrid work model (up to 5 days remote per month). As a Senior FullStack Developer – Cloud and Financial Services , you will be working for our client, a global financial institution committed to large-scale modernization of its technology landscape. Your expertise will drive the transformation of legacy systems into modular, cloud-ready platforms, fostering high performance, reliability, and security across diverse teams. This role offers the chance to influence architectural strategies and lead impactful development initiatives that support mission-critical applications used worldwide. Join us to be part of pioneering digital financial solutions that deliver tangible impact and fuel your professional growth. Your main responsibilities: Lead architecture decisions and define system boundaries, modularization strategies, and standards Create and maintain Architecture Decision Records (ADRs), API versioning, and contract standards Implement and review core backend services and React front-end applications Mentor engineers and facilitate pair or mob programming sessions Design CI/CD pipelines, automation workflows, and Infrastructure as Code (IaC) templates Own observability and reliability practices, including logging, tracing, and resiliency patterns Oversee data integrations, ETL/reporting platforms, SQL Server performance, and high availability strategies Manage technical risks, prioritize technical debt, and monitor quality gates Collaborate with architects, product owners, and QA teams to shape roadmaps and acceptance criteria You're ideal for this role if you have: 8 years of experience in senior or full-stack engineering roles Expert knowledge of C# and .NET with strong backend design skills Proven experience with Azure architecture and cloud deployments Advanced SQL Server expertise, including performance tuning and high availability strategies Strong React experience and familiarity with Angular Practical hands-on experience modernizing legacy UIs and applications Experience with WCF and workload migration to modern protocols Solid understanding of ETL and reporting tools such as SSIS, SSRS, and Power BI Familiarity with Databricks or Spark for data processing Strong CI/CD and automation skills, including Jenkins and GitOps practices It is a strong plus if you have: Kubernetes operational experience including autoscaling and rollout strategies Advanced Terraform skills and ephemeral environment management Knowledge of SSAS and Power BI advanced capabilities Experience with Databricks, Delta Lake, or Spark SQL optimization Familiarity with event streaming platforms and event-driven architectures Skills in performance profiling tools and chaos engineering Application of security-by-design principles and zero-trust security models Experience migrating Jenkins jobs to pipeline-as-code solutions Test automation expertise with xUnit, Jest, Playwright, or Pact Language Required for the role: Fluent Polish and English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. We offer you: ITDS Business Consultants is involved in many various, innovative and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious and driven people. The offer includes: Stable and long-term cooperation with very good conditions Enhance your skills and develop your expertise in the financial industry Work on the most strategic projects available in the market Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years Participation in Social Events, training, and work in an international environment Access to an attractive Medical Package Access to Multisport Program GETREADY Internal job ID 8092 You can report violations in accordance with ITDS's Whistleblower Procedure available here .