• Lead the design and evolution of our backend architecture (microservices, event-driven systems, AWS serverless, data pipelines) • Drive technical decisions and ensure best practices in code quality, security, and scalability • Mentor and support backend developers, reviewing code and helping them grow as engineers • Design and build robust APIs and data flows powering AI-driven language learning features • Partner with Product and Data Science teams to turn cutting-edge AI models into real-world educational experiences • Anticipate technical risks, propose solutions, and balance speed with long-term scalability

• Design and build backend services for corporate card issuance and management, including roles and user permissions • Integrate with core banking providers, AML systems, and SWIFT to enable reliable, compliant payment flows (SEPA, SWIFT, payout to cards) • Analyze third-party documentation and translate it into concrete integration and architecture plans • Participate in product decisions across the full development lifecycle — from RFC and PRD to production • Improve the performance, scalability, and observability of the system using tools like Kafka, tRPC/Connect RPC, Loki, and VictoriaMetrics • Hold quality to a high standard: write unit and functional tests, follow security best practices, and contribute to automated CI/CD pipelines • Collaborate daily with design, finance, and platform teams to ship a seamless end-to-end user experience

• Architect and Build scalable, high-performance backend services utilizing Java (Quarkus/Spring Boot) and Node.js architectures • Model and Evolve complex distributed domains using Domain Driven Design (DDD), bounded contexts, and event-driven patterns • Design and Implement robust asynchronous workflows and decoupled communications leveraging Kafka, AWS SQS, and AWS SNS • Own End-to-End Reliability by defining SLIs/SLOs, instrumenting observability via Datadog, and leading production incident response and log analysis • Optimize Data Architecture across relational (Aurora RDS), analytical (Google BigQuery), and caching layers (Redis) • Deploy and Operate cloud-native services on AWS/Azure utilizing Kubernetes (EKS) and driving CI/CD and progressive rollouts • Collaborate and Mentor across cross-functional Agile teams (Product, Mobile, QE, Data) to champion engineering excellence and continuous delivery

Role Description Our mission: - As a dynamic, flat and international organization, we shape the future of Deutsche Telekom IT in integrated teams consisting of all relevant competencies. Our Focus: - Architectural Evolution: Transitioning from monolithic systems to a decoupled API architecture to improve efficiency, reliability, and scalability. - Cloud Transition: Utilizing top-tier cloud solutions including AWS, Azure, and Google Cloud, while migrating from on-premise setups to a robust, scalable cloud infrastructure. - Cutting-Edge Technology: Employing modern technologies and fostering an environment that encourages learning and professional growth. - Agile Collaboration: Implementing the Scrum methodology and SAFe in our biggest projects for dynamic collaboration and efficient workflow. - Innovation & Value Creation: Redesigning solutions to fit contemporary standards and embarking on greenfield projects with high business potential. Lead Application Developer handles all phases of the software development lifecycle, providing professional support in: - Deep system analysis and technical documentation. - Building related infrastructure for developed applications through prototyping and research. - Acting as lead development architect and substituting project manager for small to midsize software projects. - Discussing and aiding Product Owners or Product Managers to align development with business goals. - Technical project management within planning phases. WHAT WILL YOU DO? - Develop new and maintain existing source code of applications. - Work in SCRUM team on developing and building complex application solutions for customer DTAG. - Serve as professional mentor for junior, medior, and senior developers. - Listen to user requests and consult with internal/external customers and project managers. - Analyze customer requirements and propose overall application/framework design of midsize application architecture. - Provide complex business analysis to build application functionality. - Provide project estimates, timelines, and bug fixing reports to customers for budget planning. - Implement customer requirements based on specifications in selected object-oriented programming languages. - Test programmed functionality before deployment to avoid bugs and ensure quality of code. - Implement security concepts according to PSA policy in developed applications. - Participate in internal evaluation processes. - Take product responsibility from a technology point of view. - Negotiate with PO/PM about technology stacks used in projects. Qualifications - Master Degree in Information Technologies. - Minimum 7 years experience in ICT Systems Engineering. - Experience in a Senior Application development position. - Certification in the technology stack used (e.g., Java – OCP, .Net – MCSA). - Expert in programming. - Overview of HW/SW and General IT Skills. - Advanced soft skills such as Communication, Team Cooperation, Mentoring, and Product Management. - English proficiency at least on B2 level. Requirements - Experience in Senior Application development position. - Preferred tech stacks for projects: - Tech stack 1: Java, Spring Boot. - Tech stack 2: Angular, React, VueJS. - Tech stack 3: C#. - Additional preferred knowledge/experience (as an advantage): - Any testing tool/framework. - Kubernetes. - Docker. - Microservices. - Git. - Cloud technologies (AWS, Azure, Google). - Database knowledge. Benefits - Financial benefits. - Benefits focused on learning and development. - Benefits focused on health and sport. - Benefits focused on family and work-life balance. - Other benefits. For more information about our benefits, click here. Company Description Our brand Deutsche Telekom IT Solutions Slovakia entered the life of Košice region in 2006 under the name of T-Systems Slovakia and has since become one of the founding members of Košice IT Valley. We have grown to be the second largest employer in the eastern part of the country with more than 3900 employees. Our goal is to proactively find new ways to improve and continuously transform into a company providing innovative information and communication technology services.