03.08.2026 aktualisiert

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Tech Lead / Senior Software Engineer | Python | Full-Stack | DevOps | Cloud Solutions | AWS

Berlin, Deutschland
Weltweit
M.Sc. Mathematics
Berlin, Deutschland
Weltweit
M.Sc. Mathematics

Profilanlagen

profile-martin-winkel.pdf

Über mich

Lead Software Engineer and Certified AWS Solutions Architect with over 10 years of experience. Combining deep technical expertise, a strong product mindset, and excellent communication skills. I worked for some of Europe’s most ambitious tech companies including Auto1, Zalando & HelloFresh.

Skills

FlutterHTMLAmazon Web ServicesAcceptance Test-Driven DevelopmentAuthenticationsTest AutomationUnit TestingBootstrapCSSMobile Application DevelopmentCloud ComputingCloud DatabaseCloud-EngineeringDjangoInfrastrukturPythonNoSQLOAuthE2e TestingAzure Active DirectorySwaggerSQLiteSQLTypeScriptOpenapiDocker ContainerMultithreadingCloud PlatformTest-Driven DevelopmentTailwindFlaskGrafanaBoto3Swift (Programmiersprache)AWS LambdaCloud TechnologiesBackendFastAPIpandasPytestGitlab-CiAWS AuroraIntegrationstestsPlaywrightGithub EnterpriseAzure AKSGraphQLFront EndApi-GatewayRestful ApisTerraformServerless ComputingDocker
I build reliable, secure, and maintainable web-based applications end-to-end — from frontend and backend development to infrastructure and CI/CD pipelines. I actively engage with the product domain to challenge assumptions and shape solutions that balance quality with practicality. I’m a dependable problem-solver who can lead complex work autonomously or make strong contributions in a team. I deliver on time and communicate clearly with all stakeholders throughout the process.

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2017

Sprachen

DeutschMutterspracheEnglischverhandlungssicher

Projekthistorie

Senior Backend Developer

Vonovia SE

Sonstiges

>10.000 Mitarbeiter

Helped Vonovia to extend its internal elevator IoT platform to support external clients.
  1. Took proactive role in architecture and feature design
  2. Collaborated directly with users and non-technical stakeholders
  3. Developed features in a vast micro-service landscape
  4. Upgraded tooling and improve app stability

Technology:
  1. Python: Alembic, Asyncio, Boto3, FactoryBoy, FastAPI, Httpx, Mypy, Pika, Pydantic, Pytest, Ruff, SQLAlchemy, Threading, Uv, Uvicorn
  2. Azure: ACR, AKS
  3. Others: Azure DevOps, Azure DevOps Pipelines, Bash, ConceptBoard, Docker, Grafana, Helm, Just, K9s, MariaDB, OpenAPI, PostgreSQL, Pre-Commit, Prometheus, RabbitMQ

Senior Backend Developer

Bayer AG

Sonstiges

>10.000 Mitarbeiter

Bayers Crop Protection Innovation Lab offers AI-driven products for farmers (https://magicscout.app/de-DE/magictrap).
  • Backend for mobile apps and tens of thousands of IoT devices
  • Ingestion of GB's of image data daily using a cost-effective, serverless, event-driven architecture on AWS
  • Integration of in-house AI models to deliver insights to customers in seconds
  • Proactive voice in architecture and feature design discussions
  • Proactive communication across teams
  • Reference expert for all questions related to Python
Technology:
  • Python: AWS Lambda Powertools, Asyncio, Boto3, FastAPI, Httpx, Locust, Motor, Mypy, PyMongo, Pydantic, Pytest, Ruff, Strawberry
  • AWS: API Gateway, Athena, Backup, CloudFront, CloudWatch, CloudTrail, Cognito, Cost Explorer, DevOps Guru, DocumentDB, DynamoDB, EventBridge, Grafana, IAM, Incident Manager, Lambda, KMS, Route53, S3, SES, SNS, SQS, Systems Manager (SSM), Transit Gateway, VPC, WAF, XRay
  • Others: Azure DevOps, Bash, Dependabot, Docker, Draw.io, FigJam, GitHub Actions, GitLab CI, Go, ImageMagick, JavaScript, OAuth 2.0, OpenAPI, Sentry, SonarQube, Terraform, TFSec, Trivy

Solution Architect & Advisor

https://www.selly.biz/

Konsumgüter und Handel

10-50 Mitarbeiter

Design of a scalable data ingestion application using Apache Airflow on AWS.
  • Design of the system directly with the CEO & CTO
  • Provide in-depth Apache Airflow knowledge
Technology:
  • Python: Airflow, Dagster, Prefect
  • AWS: S3, Managed Airflow

Lead Full Stack Developer

https://www.selly.biz/

Konsumgüter und Handel

10-50 Mitarbeiter

Kickstart a new platform for German companies to hire international kitchen staff (chef-bao.com).
  • Custom application that allows companies to add job listings and users to submit their CVs
  • In-house experts with domain knowledge (i.e. kitchen staff) review the CVs and match them with job postings
  • The applicant-facing pages were optimised for mobile devices and small screens
  • After 2 months, the platform went live smoothly to an international user base
Technology:
  • Python: Boto3, Celery, Django, Gunicorn, Mypy, Pytest, Weasyprint
  • AWS: Route53, S3, SES
  • Others: Dependabot, Docker, Draw.io, GitHub Actions, Heroku, HTML, JavaScript, Localstack, OAuth 2.0, PostgreSQL, Redis, Sentry, Tailwind CSS

Lead Full Stack Developer & Co-Founder

Lemon Tree

Konsumgüter und Handel

< 10 Mitarbeiter

Collaborating with Europe's leading producer (Lonza), we built a start-up to sell innovative food supplements.
  • We scaled to a 6-figure annual revenue while automating nearly all recurring operative tasks
  • Built the full-stack webshop using the Django Oscar framework
  • Payments were handled via PayPal and Stripe
  • Built a reporting system using Apache Airflow and Metabase
  • Built custom reports combining marketing spending and revenue figures to deepen customer understanding and drive budget decisions (e.g. cohort analyses and customer lifetime value)
  • Designed and built a custom bidding algorithm to automate the management of our Amazon Ads campaigns
Technology:
  • Python: Airflow, Alembic, Boto3, Celery, Django, Gunicorn, Mypy, Oscar, Pandas, Polars, Pytest, Ruff, SQLAlchemy
  • AWS: IAM, S3, SES
  • Others: Amazon Order API, Amazon Ads, Bootstrap (CSS), Dependabot, Docker, Draw.io, Facebook Ads, GitHub Actions, Google Ads, Heroku, HTML, JavaScript, Localstack, Metabase, OAuth 2.0, PayPal, PostgreSQL, Redis, Sentry, Stripe

Lead Backend Developer

Zalando Marketing Services

Konsumgüter und Handel

>10.000 Mitarbeiter

Zalando was unhappy with their Salesforce integration, so we set out to build a greenfield CRM application to manage sales processes end to end.
  • After 2 months, we onboarded the first users; after 4 months, Salesforce was deprecated
  • After 1 year, our application had managed campaigns worth >100 million €
  • I led the backend team and wrote most of the backend code
  • Close collaboration with the CTO, PO, other teams and users
  • Proactive ideation of new features and identification of current bottlenecks
  • Proactive voice in architecture and feature design discussions
  • Proactive communication with other teams across Zalando
  • Mentoring of junior developers
Technology:
  • Python: Airflow, Boto3, Celery, Django Rest Framework (DRF), Gunicorn, Mypy, Pytest, Requests, Weasyprint
  • AWS: Application Load Balancer (ALB), EC2, IAM, Lambda, RDS, Route53, S3, SQS, SES, Systems Manager (SSM)
  • Others: Docker, Draw.io, GitHub, Grafana, HTML, Kubectl, Kubernetes, Localstack, Nakadi (Kafka), Nginx, OAuth 2.0, OpenAPI/Swagger, PostgreSQL, React, Sentry

Senior Backend Developer

Zalando Marketing Services

Konsumgüter und Handel

>10.000 Mitarbeiter

Automate critical sales processes to enable growth.
  • Flask-based microservices to create sales reports and slide decks
  • Close collaboration with the CTO, BI & Sales
Technology:
  • Python: Flask, Openpyxl, Pandas, Pytest, Python-pptx
  • AWS: Application Load Balancer (ALB), EC2, IAM, S3
  • Others: BigQuery, Docker, Draw.io, GitHub, OAuth 2.0

Performance Marketing Automation Engineer

AUTO1 Group

Automobil und Fahrzeugbau

1000-5000 Mitarbeiter

Dramatically improved efficiency and decision-making with custom tools for online marketing platforms.
  • Design and implement a Google Ads bidding algorithm to outperform our competitors drastically
  • Build various other scripts and tools to automate online marketing campaign management
Technology:
  • Python: Pandas, Pytest
  • Others: BitBucket, DigitalOcean, Facebook Ads, Google Ads, Jenkins

Zertifikate

AWS Certified Developer - Associate

AWS (PearsonVue)

2025

AWS Certified Solutions Architect - Associate

AWS (PearsonVue)

2024

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Versichert bis: 01.04.2028

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