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Data Engineer
About US:
CETIN is a service provider for the digital business ecosystem, delivering connectivity, data center, cloud, and cybersecurity services. As a leading national and international interconnection hub in the CEE region, CETIN holds a unique position in the Serbian market. Born in telecom, with deep engineering expertise, the company provides secure, reliable, and high availability infrastructure for businesses whose operations depend on performance, resilience, and trust. With all services internally developed and validated, CETIN ensures proven quality, scalability, and operational excellence, enabling partners and customers to focus on their core business while digital ecosystems connect, scale, and grow across the region.
CETIN offers an environment for people so they can grow, continually learn, and build deep expertise, while being respected and supported to do their best.
Join us and build your expertise by working on meaningful projects and complex and large scale systems.
We are seeking a Data Engineer to become an integral part of our data and analytics team. This position involves building, deploying, and maintaining advanced data pipelines that enable both real-time and batch processing workflows. The successful candidate will work across diverse network and IT infrastructure domains, supporting AI‑enabled solutions. This role is suited for individuals who enjoy hands-on engineering and are passionate about working with data pipelines, orchestration, and applied AI within production environments.
Key Responsibilities:
- Build and operate reliable, scalable ETL/ELT workflows across multiple data sources.
- Maintain and extend the data ingestion framework to handle large-scale network telemetry, log data, and KPIs.
- Develop chatbots and AI assistants utilizing:Retrieval‑Augmented Generation (RAG)
- On‑premise, open‑source LLM solutions
- Integrate AI solutions with internal data platforms, APIs, and knowledge bases.
- Contribute documentation, best practices, and platform standardization
Required Technical Skills:
- Proficiency in Python (Pandas, PySpark, etc.) and dbt for data transformation and scripting
- Advanced SQL (analytical queries, window functions, performance tuning)
- Good command of Linux/Unix environments
- Experience with Docker containers and orchestration using Kubernetes
- Workflow automation using Apache Airflow (DAG creation, scheduling, dependencies)
- Exposure to monitoring/logging tools (e.g., Prometheus, Grafana, ELK stack) is a plus
- Experience with LLMs, RAG architecture, or AI chatbots is a plus
- Knowledge of data warehousing or Lakehouse architecture
Soft Skills & Expectations:
- Structured, self-managed, and capable of working independently
- Strong team collaboration in Agile/Scrum environments
- Fluent in English (written and spoken)
- Continuous learning with a proactive approach to new technologies and patterns
What we offer:
- Open working space and flexible working hours
- Training and development programs
- 25 days paid holiday leave per annum
- Laptop, mobile phone and tariff package in line with company policy
- Health package
- Recreation or health program
- Participation in annual bonus system
- Competitive terms and conditions
Only short-listed candidates will be contacted.
CETIN d.o.o. Beograd
CETIN je član CETIN International-a, vodećeg veleprodajnog provajdera usluga aktivne i pasivne telekomunikacione infrastrukture u centralnoj i istočnoj Evropi, koji posluje u Slovačkoj, Mađarskoj, Srbiji i Bugarskoj. CETIN upravlja telekomunikacionim portfoliom visokog kvaliteta koji obuhvata kompletnu infrastrukturu mobilne mreže širom Srbije, optičku i bežičnu mrežu, agregacione mreže i data centre. Pokrivenost naše mreže na nivou cele države kao i veliko iskustvo omogućavaju nam da…
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