Cezary Wiśniewski
Warsaw
Summary
Adaptable Application Support Engineer with robust experience in troubleshooting, maintaining, and enhancing software applications. Strong background in providing technical support, streamlining processes, and improving system performance. Skilled in collaborating with cross-functional teams, ensuring seamless operations, and delivering high-quality user support. Eager to leverage expertise to drive operational efficiency and elevate user satisfaction.
Overview
6
6
years of professional experience
1
1
Certification
Work History
Application Support Engineer
Nitrogen
Warsaw, Mazowieckie
02.2025 - Current
- - API and development support, covering internal and external integrations, frontend/backend issue resolution, and bug fixes
- - Data management, including imports, processing, and transformations
- - API and development support, covering internal and external integrations, frontend/backend issue resolution, and bug fixes
- - Infrastructure and monitoring, including system performance tracking, troubleshooting, and optimization
- Technologies & tools:
- AI: Devin AI, Cursor CLI
- Databases: SQL (MySQL, PostgreSQL, Snowflake)
- Programming: PHP, Python, Node.js, TypeScript, Go
- Cloud & DevOps: AWS (S3, CloudWatch, Step Functions, EC2, RDS, SQS, DMS), Kubernetes, K9s
- Monitoring & Incident Management: DataDog, IncidentIO, JIRA
- Version Control & APIs: GitHub, REST APIs (Postman)
Systems Support Analyst
Amelco Limited
02.2024 - 02.2025
- Managing and supporting multi-server, containerized environments across both cloud and on-premises infrastructures. Prioritising and resolving issues in alignment with customer SLAs to ensure optimal performance and satisfaction.
- Collaborated with development and infrastructure teams to deploy, test, and maintain services across PROD, DEV, and UAT environments for cloud-based sportsbook applications, enhancing reliability for multiple betting companies.
- Automated infrastructure tasks using AWX to streamline deployment processes.
- Analysing logs and troubleshooting issues with Loki, Splunk or directly on Linux servers. Using Zabbix for applications and infrastructure monitoring.
- Created and analysed dashboards and alerts in Grafana for performance monitoring, identifying areas for improvement and enabling data-driven decision-making.
- Proficient in GitHub for repository management, version control, and workflow automation. Troubleshooting code and configuration changes in collaborative environments.
- Strong skills in Ubuntu for server and application management. Basic experience with Linux shell scripting for automation and system monitoring.
- Administered and troubleshot PostgreSQL databases, writing SQL queries for application support and debugging, and implementing database changes to enhance system performance.
Senior Support Engineer
MicroStrategy
Warsaw, Mazowieckie
08.2022 - 02.2024
Technical Support Engineer
MicroStrategy
Warsaw, Mazowieckie
07.2021 - 07.2022
Service Process Controller
Fujitsu
02.2021 - 06.2021
Information Technology Help Desk Support
Fujitsu
11.2019 - 01.2021
Education
Data Modeling/Warehousing and Database Administration
Warszawska Wyższa Szkoła Informatyki
Warsaw06-2021
High School Diploma -
ZS UMK Gimnazjum i Liceum Akademickie
Torun06-2015
Computer Science
Warszawska Wyższa Szkoła Informatyki
Warsaw02-2025
Bachelor of Science - BS - Chemical Engineering
Warsaw University of Technology
Warsaw01-2020
Skills
- AWS
- AI: Claude
- AI: Devin
- AI: Cursor
- Snowflake
- Unix
- Git
- Github
- REST API
- K8s
- Docker
- Python
- Datadog
- Grafana
- Loki
- Splunk
Certification
- MicroStrategy Certified Architect
- CCNA: Introduction to Networks
- MicroStrategy Certified Analyst
- AWS Certified Cloud Practitioner
Websites, Portfolios and Profiles
www.linkedin.com/in/cezaryw-785b471b3
Languages
English
Advanced
C1
Polish
Proficient
C2
Interests
- Cooking
- DIY enthusiast
Timeline
Application Support Engineer
Nitrogen
02.2025 - Current
Systems Support Analyst
Amelco Limited
02.2024 - 02.2025
Senior Support Engineer
MicroStrategy
08.2022 - 02.2024
Technical Support Engineer
MicroStrategy
07.2021 - 07.2022
Service Process Controller
Fujitsu
02.2021 - 06.2021
Information Technology Help Desk Support
Fujitsu
11.2019 - 01.2021
Data Modeling/Warehousing and Database Administration
Warszawska Wyższa Szkoła Informatyki
High School Diploma -
ZS UMK Gimnazjum i Liceum Akademickie
Computer Science
Warszawska Wyższa Szkoła Informatyki
Bachelor of Science - BS - Chemical Engineering
Warsaw University of Technology