Data Engineer for AI Stack (f/m/d) @ A1 Competence Delivery Center
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Before you apply
LocationСофия
Work modehybrid
Typefull-time
Company size1,001–5,000 people
PostedSep 16, 2026 · 1mo ago
Verified live22h ago
At a glanceSummarised by Seekless from the posting.
Strong data-engineering experience using Python, SQL, and modern orchestration or integration tools
Experience building reliable production pipelines across heterogeneous data sources
Knowledge of ETL/ELT, APIs, relational databases, object storage, file ingestion, and schema evolution
Understanding of data-quality controls, lineage, metadata, replay, backfill, and idempotency
Experience with workflow orchestration and automated deployment
Familiarity with containerised execution environments and Kubernetes-based data workloads
Ability to analyse failure modes and design recoverable data processes
Strong communication skills and the ability to work with source-system owners, architects, platform engineers, governance teams, and use-case developers
Airflow, Airbyte, Meltano, OpenMetadata, dbt, Spark, Trino, Dremio, DuckDB, Iceberg, or Delta Lake
MLflow, Feast, vector databases, embedding pipelines, or RAG ingestion
Azure, Exoscale SOS/S3, Cloudera, Synapse, Teradata, PostgreSQL, Oracle, or Microsoft SQL Server
Streaming technologies such as Kafka or Flink
Experience with OpenLineage and OpenTelemetry
Knowledge of AI/ML data lifecycles, feature engineering, or model-serving integration
Skills
Python
SQL
Airflow
Airbyte
Meltano
OpenMetadata
dbt
Spark
Trino
Dremio
DuckDB
Iceberg
Delta Lake
MLflow
Feast
Kafka
Flink
Azure
Exoscale SOS/S3
Cloudera
Synapse
Teradata
PostgreSQL
Oracle
Microsoft SQL Server
OpenLineage
OpenTelemetry
Kubernetes
Benefits
Health insurance
Remote flexibility
Learning opportunities
Career development
Strength. Care. Growth
A1 Competence Delivery Center is a vital component of A1’s telecommunications business. Acting as an expertise hub, CDC is dedicated to delivering a full range of high-quality IT, network, financial and other services to support A1’s operations across all OpCos, independent of location.
Using the power of being OneGroup and leveraging synergies, CDC enables transparency of resources, key skills and knowledge expansion and personal career growth opportunities’ enhancement, paired with job stability.
You will know we are the right place for you, if you are driven by:
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Opportunities to learn and build your career.
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Meaningful work in a stable and fast-paced company.
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Diversity of people, projects, and platforms.
•
A supportive, fun, and inspiring place to work.
Would you like to join us?
Job Purpose:
As a Data Engineer for AI Stack, you will make enterprise data usable by the AIaaS platform. Your focus will be data ingestion, transformation, orchestration, metadata, lineage, replay, quality, and secure integration with A1 data sources.
You will work across APIs, databases, files, object storage, event sources, and analytical platforms. You will help establish reusable integration patterns that can support AI, machine-learning, RAG, analytics, and operational automation use cases.
Role insights:
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Design and implement batch, incremental, API-based, and file-based data-ingestion pipelines.
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Integrate the AIaaS platform with enterprise systems, databases, object storage, SaaS services, data lakes, and approved on-premises sources.
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Define processing patterns for transformation, enrichment, validation, deduplication, checkpointing, retries, replay, and backfill.
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Implement idempotent pipelines with clear failure and recovery semantics.
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Develop reusable connectors, Python jobs, orchestration workflows, and data-service APIs.
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Establish source-to-target mappings, schemas, contracts, and validation rules.
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Contribute to the design of operational storage, object storage, analytical layers, open-table formats, vector stores, and feature stores.
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Integrate pipelines with orchestration, metadata, lineage, observability, and data-quality services.
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Define how lineage is generated and propagated rather than relying solely on passive metadata cataloguing.
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Support RAG ingestion, document processing, embedding pipelines, feature engineering, model-training data preparation, and batch inference.
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Work with security and privacy stakeholders on data classification, minimisation, pseudonymisation, retention, and access controls.
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Provide realistic workload profiles for capacity, storage, network, and performance planning.
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Produce data-flow diagrams, interface catalogues, operational runbooks, and support documentation.
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Help distinguish reusable platform capabilities from use-case-specific engineering.
What makes you unique:
•
Strong data-engineering experience using Python, SQL, and modern orchestration or integration tools.
•
Experience building reliable production pipelines across heterogeneous data sources.
•
Knowledge of ETL/ELT, APIs, relational databases, object storage, file ingestion, and schema evolution.
•
Understanding of data-quality controls, lineage, metadata, replay, backfill, and idempotency.
•
Experience with workflow orchestration and automated deployment.
•
Familiarity with containerised execution environments and Kubernetes-based data workloads.
•
Ability to analyse failure modes and design recoverable data processes.
•
Strong communication skills and the ability to work with source-system owners, architects, platform engineers, governance teams, and use-case developers.
Nice to have:
•
Airflow, Airbyte, Meltano, OpenMetadata, dbt, Spark, Trino, Dremio, DuckDB, Iceberg, or Delta Lake.
•
MLflow, Feast, vector databases, embedding pipelines, or RAG ingestion.
•
Azure, Exoscale SOS/S3, Cloudera, Synapse, Teradata, PostgreSQL, Oracle, or Microsoft SQL Server.
•
Streaming technologies such as Kafka or Flink.
•
Experience with OpenLineage and OpenTelemetry.
•
Knowledge of AI/ML data lifecycles, feature engineering, or model-serving integration.
Our gratitude for the job done will be eternal, but we’ll also offer you:
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Innovative technologies and platforms to work with.
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Modern working environment for your comfort.
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Friendly, ambitious, and motivated teammates to support each other.
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Thousands of online and in-person learning opportunities to grow.
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Challenging assignments and career development opportunities in multinational environment.
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Attractive remuneration package.
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Flexible working schedule and opportunity for home office.
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Numerous additional goodies, including, but not limited to free A1 services, discounts, health insurance and services, sports center, childcare, team and family events, etc.
If you have any questions, please do not hesitate to contact Mariya Ivanova.
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