# Experience: Staff Data, Analytics & AI Engineer — Swisscom (Schweiz) AG
## October 2023 – Present | Bern, Switzerland

### Cross-Position Section

**Career arc framing:** Swisscom is Dennis's current and most senior role — a promotion from Senior to Staff (Engineer IV) in April 2025. This is the anchor position for all target role types. It demonstrates the full stack: owned pipelines, cloud migration, containerized delivery, security ownership, and stakeholder-facing data products. At a major national telco operating AWS-heavy infrastructure, this is the clearest signal for Staff/Senior Data Engineering, Data Platform, and ML Engineering roles.

**CL framing (for cover letters):** "My current role at Swisscom — Switzerland's largest telco — gives me end-to-end ownership of business-critical data pipelines at scale: from Oracle and Kafka ingestion through Teradata DWH to AWS cloud-native architecture. I've led the migration of legacy pipelines to serverless AWS services and own the full DevOps lifecycle including Kubernetes deployment, GitLab CI/CD, and on-call support."

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### Achievement SW-1: AWS Migration of Legacy ETL Stack

**Source:** thiessen_swisscom_zwischenzeugnis.md, thiessen_cv_master_profile.md
**User's role:** Primary owner / sole technical lead
**Status:** Active / ongoing operational achievement

**Context:** Legacy ETL pipelines ran on Teradata and Oracle. Migration to AWS cloud-native stack reduces operational overhead, improves scalability, and positions the team for modern serverless workflows.

**Bullet variants:**
- **2L:** Migrated legacy Teradata/Oracle ETL pipelines to AWS cloud-native architecture (S3, Glue, Athena with Apache Iceberg, Redshift, Airflow, CloudFormation), reducing manual operational overhead and enabling scalable, serverless data processing for downstream analytics.
- **3L:** Led migration of legacy Teradata/Oracle ETL stack to a fully cloud-native AWS architecture using S3, Glue Jobs and Tables, Athena with Apache Iceberg (open table format), Redshift, Lambda, Step Functions, Airflow, and CloudFormation for IaC; reduced operational overhead, improved pipeline observability, and enabled scalable serverless processing — directly accelerating data availability for B2B stakeholder analytics.
- **1L:** Migrated legacy ETL stack to AWS (S3, Glue, Athena/Iceberg, Redshift, Airflow, CloudFormation) for scalable serverless data processing.

**Key skills:** AWS, S3, Glue, Athena, Apache Iceberg, Redshift, Lambda, Step Functions, Airflow, CloudFormation, IaC, ETL migration, cloud-native architecture
**ATS keywords:** AWS, data pipeline migration, ETL, serverless, Airflow, Redshift, Glue, Athena, Apache Iceberg, CloudFormation, IaC
**Reframing notes:**
- Data Platform/Infra: lead with AWS architecture and serverless; de-emphasize downstream analytics angle
- Staff/Senior DE: lead with ownership and scale; emphasize reduction in operational overhead
- Analytics Engineer: lead with enabling analytics outcomes for B2B stakeholders
- ML/AI: minor relevance — mention as infrastructure enabling ML data access

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### Achievement SW-2: Component Ownership — Fulfillment ETL Pipelines

**Source:** thiessen_swisscom_zwischenzeugnis.md, thiessen_cv_master_profile.md
**User's role:** Component Owner — primary responsible engineer
**Status:** Active / ongoing

**Context:** Business-critical Fulfillment domain data flows from Oracle source systems into Teradata DWH via Kafka and Python pipelines. Dennis is Component Owner — accountable for data availability, SLA, quality, compliance and on-call duty.

**Bullet variants:**
- **2L:** Served as Component Owner for business-critical Fulfillment ETL pipelines (Oracle → Kafka → Teradata DWH in Python), ensuring data availability for downstream analysis under on-call SLA and full Data Governance compliance.
- **3L:** Owned end-to-end component responsibility for Swisscom's Fulfillment domain ETL pipelines — ingesting business-critical data from Oracle and Kafka sources into Teradata DWH via Python; enforced Data Governance, security, and privacy standards; covered 2nd/3rd-level support and on-call duty to maintain SLA adherence at scale.
- **1L:** Owned Fulfillment ETL pipelines (Oracle/Kafka → Teradata) as Component Owner under full on-call SLA and compliance accountability.

**Key skills:** ETL/ELT, Python, Kafka, Oracle, Teradata DWH, data governance, component ownership, on-call SLA, SAP BODS
**ATS keywords:** ETL, Kafka, Teradata, Oracle, data pipeline, data governance, SLA, component ownership
**Reframing notes:**
- Staff/Senior DE: this is the flagship ownership bullet — always include; leads with accountability signal
- Data Platform/Infra: de-emphasize "Fulfillment domain" context; emphasize Kafka and Teradata scale
- Analytics Engineer: frame around "enabling data availability for downstream analytics"
- ML/AI: minor — mention as reliable data feed for ML models if needed

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### Achievement SW-3: Python Applications on Kubernetes + GitLab CI/CD

**Source:** thiessen_swisscom_zwischenzeugnis.md, thiessen_linkedin_profile.md
**User's role:** Primary developer / operator
**Status:** Active / ongoing

**Context:** Python data applications deployed on Kubernetes clusters with GitLab CI/CD automation — containerized delivery in an agile DevOps team with full lifecycle ownership.

**Bullet variants:**
- **2L:** Designed, deployed and operated Python data applications on Kubernetes clusters with GitLab CI/CD automation, enabling reliable containerized pipeline delivery and continuous integration in an agile DevOps team.
- **3L:** Built and operated Python-based data applications deployed to Kubernetes clusters; automated the full CI/CD lifecycle via GitLab, including build, test, and deployment pipelines — delivering containerized services reliably in an agile DevOps team with GitLab-managed quality gates and rollback controls.
- **1L:** Deployed and operated Python data apps on Kubernetes with GitLab CI/CD in an agile DevOps team.

**Key skills:** Python, Kubernetes, GitLab CI/CD, Docker, containerization, DevOps, agile
**ATS keywords:** Kubernetes, Python, GitLab, CI/CD, Docker, DevOps, containerization
**Reframing notes:**
- Data Platform/Infra: lead with K8s and CI/CD; emphasize infrastructure automation angle
- Staff/Senior DE: pair with SW-2 to show pipeline + deployment ownership as a unit
- ML/AI: frame as "deployed ML-ready Python services to Kubernetes"

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### Achievement SW-4: B2B Data Products, Stakeholder Analytics & Process Automation

**Source:** thiessen_cv_master_profile.md, thiessen_swisscom_zwischenzeugnis.md, thiessen_linkedin_profile.md
**User's role:** Data product owner / analyst-engineer interface
**Status:** Active / ongoing

**Context:** Delivered data products, dashboards and analyses for B2B stakeholders; also drove automation of technical processes and conducted root cause analysis under 2nd/3rd level support.

**Bullet variants:**
- **2L:** Delivered data products, analyses and dashboards for B2B stakeholders; drove automation of technical workflows and performed root cause analysis under 2nd/3rd-level support responsibility to maintain data platform reliability.
- **3L:** Partnered with Product Owner to refine and prioritize backlog, enabling agile delivery of data products and dashboards for B2B stakeholders; proactively drove automation of recurring technical processes and conducted structured root cause analysis under 2nd/3rd-level support and on-call duty — bridging engineering depth with business delivery cadence.
- **1L:** Delivered B2B data products and dashboards; drove process automation and root cause analysis under 3rd-level support.

**Key skills:** Data products, dashboards, stakeholder management, root cause analysis, agile backlog management, product ownership collaboration, PySpark
**ATS keywords:** data products, stakeholder management, agile, backlog, dashboards, root cause analysis
**Reframing notes:**
- Analytics Engineer: this is the primary bullet for this role type — lead with stakeholder/product angle
- Staff/Senior DE: supporting bullet; frame around reliability and automation
- ML/AI: minor relevance unless JD asks for MLOps/data product ownership

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### Achievement SW-5: Security Champion — 3 Consecutive Years

**Source:** thiessen_swisscom_security_champion.md, thiessen_swisscom_zwischenzeugnis.md
**User's role:** Designated Security Champion (annually renewed)
**Status:** Active (2025/26 badge current)

**Context:** Swisscom's Security Champion program requires 100h of structured training covering Cloud Security, DevSecOps, Security by Design, and Risk Management, plus a 40-question assessment (>80% passing grade). Dennis has held this role for 3 consecutive years.

**Bullet variants:**
- **2L:** Named Swisscom Security Champion for 3 consecutive years (2023/24–2025/26), owning security compliance, risk monitoring and deviation tracking for the team's pipelines; completed 100h annual DevSecOps training with >80% assessment score.
- **3L:** Designated as Security Champion for Swisscom's Data Lake team for 3 consecutive years (2023/24, 2024/25, 2025/26) — responsible for security compliance in development and operation, risk monitoring, and deviation reporting; fulfilled annual 100h structured training across Cloud Security, DevSecOps, Security by Design, and Security Risk Management, passing a 40-question comprehensive assessment with >80% score each year.
- **1L:** Swisscom Security Champion for 3 consecutive years (2023–2026) — DevSecOps, risk monitoring, 100h training + assessment.

**Key skills:** DevSecOps, security compliance, risk management, security awareness, Security by Design
**ATS keywords:** DevSecOps, security champion, security compliance, risk management, cloud security
**Reframing notes:**
- Data Platform/Infra: HIGH relevance — embed security in infrastructure angle
- Staff/Senior DE: include as supporting signal for senior-level ownership breadth
- Analytics Engineer: LOW — de-emphasize or omit unless JD asks for security awareness
- ML/AI: include for AI-adjacent roles where model security/compliance is relevant

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### Achievement SW-6: PySpark Backend Engineering

**Source:** thiessen_linkedin_profile.md
**User's role:** Developer
**Status:** Active / ongoing (Staff-level confirmed)

**Context:** PySpark used in backend data engineering at Staff level at Swisscom. Confirms Big Data processing capability beyond standard Python/SQL.

**Bullet variants:**
- **2L:** Applied PySpark for large-scale backend data processing alongside Python and SQL, extending pipeline capabilities to distributed Big Data workloads within the Swisscom Data Lake platform.
- **1L:** Applied PySpark for distributed data processing in the Swisscom Data Lake environment.

**Key skills:** PySpark, Apache Spark, big data, distributed computing
**ATS keywords:** PySpark, Spark, big data, distributed processing
**Reframing notes:**
- This is a skills signal more than a standalone achievement; roll into skills taxonomy
- Mention in bullet if JD explicitly requires Spark/PySpark
- Can be folded into SW-2 or SW-3 bullet if space is tight

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## Position Summary

| Achievement | ID | Priority for DE | Priority for Analytics | Priority for ML/AI | Priority for Platform |
|-------------|----|-----------------|-----------------------|--------------------|----------------------|
| AWS Migration | SW-1 | HIGH | HIGH | MED | HIGH |
| Component Owner / Fulfillment ETL | SW-2 | HIGH | HIGH | MED | HIGH |
| Kubernetes + GitLab CI/CD | SW-3 | HIGH | MED | HIGH | HIGH |
| B2B Data Products + Automation | SW-4 | MED | HIGH | MED | MED |
| Security Champion | SW-5 | MED | LOW | MED | HIGH |
| PySpark | SW-6 | MED | LOW | MED | MED |