About us Are you looking for an exciting opportunity to join a fast-growing fintech company that is revolutionizing the payment industry? Do you want to work with cutting-edge technologies and a talented team of professionals? If yes, then Wallester AS might be the perfect place for you! Wallester AS is an Estonian licensed payment service provider that develops financial digital technology and issues VISA cards. Since 2018, we have been an official Visa partner and Visa FinTech Fast Track Member issuing physical and virtual cards of any type: debit cards, credit cards, prepaid cards, and cards for business. Our distinctive advantage is a unique REST API created by our in-house development team. Easily integrated with any platform, it allows you to launch your card program in no time! We are looking for passionate and driven individuals who share our vision of creating truly high-quality and profitable products for our clients. About the role As a Technical Support Engineer at Wallester, you will play a key role in resolving complex technical issues reported by our clients and internal teams. You'll work on identifying, analyzing, and resolving problems related to backend services, APIs, infrastructure, and databases, ensuring our clients receive timely and accurate solutions. This role requires strong technical skills, excellent problem-solving abilities, and a clear customer-first mindset. You'll collaborate closely with Support, Operations, Engineering, and DevOps teams to drive issue resolution, improve system reliability, and enhance the overall support process. If you thrive on helping customers, enjoy diving into technical challenges, and want to contribute to a high-performance fintech environment, we'd love to meet you. Technology stack + Golang + PostgreSQL + Redis + JSON REST API + Kubernetes + AWS infrastructure + Microservices Architecture + ElasticSearch + Kibana + Prometheus + Grafana + OpsGenie What will you do? + Serve as the final escalation point for issues & incidents escalated from Operations team (L2 support). + Diagnose and troubleshoot backend, API, and infrastructure-related issues. + Troubleshoot and resolve minor issues when possible, escalating as appropriate for urgency or scope. + Own root cause analysis for complex problems and collaborate with Engineering and DevOps to implement durable fixes. + Maintain and write internal knowledge base and runbooks. + Automate repetitive investigation or diagnostic steps using scripts or internal tools. + Monitor system alerts and logs to detect and prevent issues proactively. + Track internal SLAs for issue response and resolution. + Participate in post-incident reviews and provide documentation to the wider team. + Own & drive monitoring, logging, and alerting in collaboration with DevOps & Engineering teams. + Support audit readiness by documenting processes, recurring issues and resolutions. + Participate in on-call rotations. What you'll need + 3+ years of experience in technical support, software engineering or SRE roles. + Experience troubleshooting issues in backend and microservice-based systems by analyzing application logs, API traffic, request flows, and service interactions. + Skilled in identifying and resolving database-related problems, including query performance issues, data inconsistencies. + Familiarity with observability tools like Prometheus, Grafana, ELK stack, CloudWatch, Rollbar and Honeycomb. + Excellent communication skills and ability to convey technical details clearly to non-technical peers. + Strong analytical thinking and incident management skills. + Proven ability to work cross-functionally during time-sensitive or stressful situations. Nice to have + Prior experience supporting payment systems or fintech platforms. + Understanding of card issuing platforms and APIs (e.g., Visa, Mastercard ecosystems). + Experience writing diagnostic scripts in Python, Go, or Bash. + Knowledge of PCI-DSS, OWASP, or other compliance and security standards. + Familiarity with CI/CD workflows and deployment pipelines to track releases, investigate deployment-related issues, and support troubleshooting. Also, a spark in the eyes is always a plus! ​We offer + Competitive salary + Development and career opportunities + Medical Insurance upon the completion of the probationary period + Supportive and caring Leadership + A modern office in the center of Tallinn + A chance to work as part of a highly motivated and talented team + Referral program + Stebby + Team building and Company Events + Free parking