Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm Patrick Seelemeyer, a Senior Full-Stack Software Engineer with a Bachelor's in Computing. I thrive in fast-paced, agile environments and am a strong remote team player who communicates clearly and delivers robust software. I am result-driven, solution-oriented, and passionate about solving complex problems. I specialize in designing scalable backend services, delightful frontend experiences, and robust APIs, with a focus on security, interoperability, and UX. I enjoy collaborating with data scientists and product teams to ship impactful, compliant solutions across healthcare, payments, ERP/CRM, and cloud-native ecosystems.…I'm Patrick Seelemeyer, a Senior Full-Stack Software Engineer with a Bachelor's in Computing. I thrive in fast-paced, agile environments and am a strong remote team player who communicates clearly and delivers robust software. I am result-driven, solution-oriented, and passionate about solving complex problems. I specialize in designing scalable backend services, delightful frontend experiences, and robust APIs, with a focus on security, interoperability, and UX. I enjoy collaborating with data scientists and product teams to ship impactful, compliant solutions across healthcare, payments, ERP/CRM, and cloud-native ecosystems.

Patrick Seelemeyer

Web Developer, Full Stack Developer, Developer, +3





I'm Patrick Seelemeyer, a Senior Full-Stack Software Engineer with a Bachelor's in Computing. I thrive in fast-paced, agile environments and am a strong remote team player who communicates clearly and delivers robust software. I am result-driven, solution-oriented, and passionate about solving complex problems. I specialize in designing scalable backend services, delightful frontend experiences, and robust APIs, with a focus on security, interoperability, and UX. I enjoy collaborating with data scientists and product teams to ship impactful, compliant solutions across healthcare, payments, ERP/CRM, and cloud-native ecosystems.…I'm Patrick Seelemeyer, a Senior Full-Stack Software Engineer with a Bachelor's in Computing. I thrive in fast-paced, agile environments and am a strong remote team player who communicates clearly and delivers robust software. I am result-driven, solution-oriented, and passionate about solving complex problems. I specialize in designing scalable backend services, delightful frontend experiences, and robust APIs, with a focus on security, interoperability, and UX. I enjoy collaborating with data scientists and product teams to ship impactful, compliant solutions across healthcare, payments, ERP/CRM, and cloud-native ecosystems.

Available to hire

I’m Patrick Seelemeyer, a Senior Full-Stack Software Engineer with a Bachelor’s in Computing. I thrive in fast-paced, agile environments and am a strong remote team player who communicates clearly and delivers robust software. I am result-driven, solution-oriented, and passionate about solving complex problems.

I specialize in designing scalable backend services, delightful frontend experiences, and robust APIs, with a focus on security, interoperability, and UX. I enjoy collaborating with data scientists and product teams to ship impactful, compliant solutions across healthcare, payments, ERP/CRM, and cloud-native ecosystems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Fluent

Bashkir

Advanced

Work Experience

Senior Software Engineer at Delivery Hero

April 1, 2025 - August 28, 2025

Led a team of 6 engineers to develop an AI-driven healthcare platform for automated diagnostics using real-time ECG analysis. Designed and implemented a Revenue Cycle Management system integrating HL7 and FHIR APIs to ensure HIPAA-compliant data exchange. Migrated a legacy monolithic app to scalable microservices using design patterns like Strangler and CQRS. Developed backend microservices in Node.js (NestJS) and Python (FastAPI) with RabbitMQ communication. Built GraphQL APIs integrated with React frontend. Created secure authentication microservice with OIDC, SSO, JWT, and 2FA, deployed on AWS Lambda. Developed scalable WebSocket servers using Node.js and Redis Pub/Sub. Built React/Next.js frontend infrastructure with best practices including SSR, SSG, and ISR. Ensured 80%+ test coverage with Jest and React Testing Library. Defined and deployed AWS infrastructure with Terraform, with container orchestration using Docker and Kubernetes. Mentored juniors to improve team efficiency and

Senior Web Developer at Spotify

April 1, 2021 - August 28, 2025

Architected high-throughput microservices in Java and Scala on Google Kubernetes Engine, handling 50M playlist requests daily with 99.9% uptime. Built real-time Apache Kafka pipelines for processing 1.2 billion user interactions daily, powering personalized playlists. Tuned Cassandra clusters reducing read latency and storage costs. Developed Web Player features in React/Redux and Next.js, improving performance and session length. Led batch workflow orchestration with Luigi and Flo and collaborated on ML model deployment with CI/CD pipelines. Established observability via Prometheus, Grafana, and OpenTracing for prod anomaly detection. Mentored squad on microservices, Kafka streams, and Kubernetes, accelerating feature delivery. Designed serverless architectures using AWS Lambda, API Gateway, and DynamoDB with secure IAM integration, optimizing costs and performance.

Frontend Engineer at Zalando

July 1, 2018 - August 28, 2025

Developed full-stack iGaming platform integrating cryptocurrency payments via Web3 APIs, enabling secure wallet operations and real-time gameplay. Managed Firestore and Firebase Authentication on GCP for database optimization and secure user management. Built high-performance RESTful APIs using Node.js (Express.js) and Python (Django, Flask) with ORM integrations. Improved frontend performance by 40% through code-splitting, lazy loading, and asset optimization. Implemented TDD and BDD in CI/CD pipelines achieving over 80% test coverage. Enhanced search and analytics by integrating Elasticsearch with MongoDB. Configured Cloudflare and Nginx for CDN caching, DDoS protection, and load balancing. Collaborated with DevOps to streamline automated CI/CD pipelines using GitHub Actions and Jenkins.

Software Consultant (Full Stack) at ThoughtWorks

June 1, 2016 - August 28, 2025

Developed enterprise web applications using Ruby on Rails and React, delivering agile consulting in fintech and healthcare sectors. Enhanced backend functionality with Python and Java by applying OOP and SOLID principles, boosting data processing efficiency by 25%. Utilized AWS and GCP services including EC2, S3, Lambda, Cloud Functions, Big Query, and Firestore to deploy and manage scalable cloud applications.

Senior Software Engineer at Delivery Hero

April 1, 2025 - September 3, 2025

Led a team of 6 engineers in developing an AI-driven healthcare platform automating diagnostics and prescriptions through real-time ECG data analysis. Designed a Revenue Cycle Management system integrating HL7 and FHIR APIs for HIPAA-compliant healthcare billing and claim processing. Migrated legacy monoliths to scalable microservices architectures employing design patterns like Strangler, Saga, and CQRS. Developed high-performance microservices using Node.js (NestJS) and Python (FastAPI), implementing RabbitMQ for inter-service messaging. Created secure authentication microservices with OIDC, SSO, JWT, 2FA deployed on AWS Lambda. Built scalable WebSocket servers with Redis Pub/Sub to handle concurrent connections. Developed React/Next.js frontend infrastructures with SSR, SSG, and ISR techniques for optimal SEO and performance. Implemented unit and integration testing maintaining over 80% coverage. Deployed cloud infrastructure using Terraform, Docker, Kubernetes, and AWS CDK. Mentore

Senior Web Developer at Spotify

April 1, 2021 - September 3, 2025

Architected high-throughput microservices in Java and Scala on Google Kubernetes Engine using Spring Boot and Akka HTTP serving over 50 million playlist requests daily with 99.9% uptime. Developed real-time event pipelines with Apache Kafka and Scio processing 1.2 billion user interactions daily for personalized playlists. Tuned Apache Cassandra clusters reducing 99th-percentile read latency by 63% and cutting storage costs by 25%. Developed next-gen Web Player features with React/Redux and Next.js implementing SSR and dynamic imports boosting user engagement. Led data workflow orchestration with Luigi and Flo, and collaborated with ML teams on CI/CD deployments. Instituted observability using Prometheus, Grafana, catching 90% of anomalies pre-user impact. Mentored a 6-engineer squad enhancing feature delivery cadence by 30%. Designed and deployed serverless architectures using AWS Lambda, API Gateway, and DynamoDB with secure IAM access and infrastructure as code with AWS CDK.

Frontend Engineer at Zalando

July 1, 2018 - September 3, 2025

Developed a full-stack iGaming platform integrating cryptocurrency payments with Web3 APIs for secure transactions and real-time gameplay. Managed Firestore and Firebase Authentication on GCP, optimizing performance and security. Built high-performance REST APIs using Node.js (Express.js) and Python (Django, Flask) integrating ORM tools for efficient data management. Improved frontend performance by implementing code-splitting, lazy loading, and asset optimization achieving a 40% page load speed improvement. Integrated Elasticsearch with MongoDB for enhanced search and analytics. Configured Cloudflare and Nginx for secure, high-performance applications with CDN, load balancing, and DDoS protection. Collaborated with DevOps on CI/CD pipeline optimization using GitHub Actions and Jenkins. Practiced TDD and BDD with automated testing achieving over 80% test coverage.

Software Consultant (Full Stack) at ThoughtWorks

June 1, 2016 - September 3, 2025

Developed enterprise web applications with Ruby on Rails and React for fintech and healthcare clients. Applied OOP and SOLID principles with Python and Java backend development improving data processing efficiency by 25%. Delivered agile consulting to improve client software projects. Gained hands-on experience deploying and managing cloud infrastructure using AWS and GCP services including EC2, S3, Lambda, Cloud Functions, BigQuery, and Firestore ensuring scalable and performant cloud applications.

Senior Software Engineer at Delivery Hero

September 1, 2025 - September 1, 2025

Led a team of 6 software engineers to develop an AI-driven healthcare platform enabling automated diagnostics and real-time ECG data analysis. Designed and built a robust Revenue Cycle Management (RCM) system with HL7 and FHIR APIs for interoperable, HIPAA-compliant data handling. Migrated a legacy monolithic application to a scalable microservices architecture, implementing Strangler, Database-per-Service, API Gateway, Saga, and CQRS for efficient service communication and transaction management. Architected a C# 9/.NET 6 microservices ecosystem for hotel reservations, payments, and loyalty programs with 99.99% uptime across 10+ services. Defined OpenAPI contracts and auto-generated client SDKs, containerized services with Docker, and orchestrated deployments via Kubernetes. Optimized PostgreSQL schemas for high-volume workloads and implemented Redis caching to accelerate read-heavy endpoints. Built Kafka pipelines for real-time availability updates and audit logs processing millions

Senior Web Developer at Spotify

April 1, 2021 - April 1, 2021

Architected high-throughput Java and Scala microservices on Google Kubernetes Engine using Spring Boot and Akka HTTP to serve 50M+ playlist requests daily with 99.9% uptime. Built real-time event pipelines with Apache Kafka and Scio (Apache Beam/Dataflow), processing 1.2B user interactions daily for Discover Weekly and Release Radar. Optimized Cassandra metadata storage, achieving lower latency and cost, and developed domain-driven .NET Core microservices with CQRS and Event Sourcing. Standardized environments with Docker Compose and Azure Container Registry, implemented serverless architectures using AWS Lambda/API Gateway, and designed scalable infrastructure with AWS CDK/CloudFormation. Enhanced performance with partitioning, Redis Streams, and caching (DAX).

Frontend Engineer at Zalando

July 1, 2018 - July 1, 2018

Developed a full-stack iGaming platform with cryptocurrency payments and real-time features. Managed Firestore and Firebase Authentication on GCP, and designed 12 domain-oriented services in .NET 6 using CQRS and Event Sourcing with Kafka. Containerized services with Docker and deployed on AKS, implemented API contracts and documentation with Swashbuckle/OpenAPI, and optimized data layer with PostgreSQL partitioning and Redis caching. Collaborated across teams (including Mandarin-speaking counterparts) to accelerate feature delivery and supported CI/CD pipelines using GitHub Actions and Jenkins.

Software Consultant (Full Stack) at ThoughtWorks

June 1, 2016 - June 1, 2016

Developed enterprise web applications using Ruby on Rails and React; delivered agile consulting for fintech and healthcare clients. Built backend functionality with Python and Java, optimizing data processing with OOP, SOLID principles, and algorithmic improvements. Gained hands-on experience with AWS and GCP, deploying scalable cloud-based applications for performance and reliability.

Senior Software Engineer at Simple Online Healthcare

July 1, 2025 - December 1, 2025

Led end-to-end development of a compliant digital healthcare platform supporting remote diagnosis, prescription fulfillment, and medication delivery; built a Django-based backend with DRF and PostgreSQL on AWS; integrated machine learning for prescription eligibility checks; developed a real-time ECG processor with TensorFlow Lite for AI-augmented diagnostics; migrated from a monolith to Python microservices; implemented a Saleor-based pharmacy backend with Stripe for payments; integrated HL7 and FHIR APIs; implemented OAuth2/JWT RBAC; containerized with Docker and orchestrated on AWS EKS; built a real-time ERP/CRM connector using webhooks; defined OpenAPI-based APIs and generated TypeScript SDKs; optimized PostgreSQL schemas; enhanced observability with Sentry and Datadog; collaborated with data scientists for patient segmentation and Braze engagement flows.

Senior Software Engineer at Delivery Hero

May 1, 2021 - June 1, 2025

Built a scalable, multi-tenant financial transaction platform using Kotlin, Spring Boot, AWS Lambda, DynamoDB and Apache Kafka; designed an event-sourced CQRS architecture for reliable state management and auditability; implemented OAuth2/API gateway with Kong; established CI/CD with GitLab, Terraform, and Spinnaker; implemented real-time ledger reconciliation with PostgreSQL; integrated security tooling for GDPR/ISO controls; led resilience efforts including incident response and chaos testing.

Senior Web Developer at Spotify

August 1, 2018 - April 1, 2021

Architected high-throughput microservices in Java and Scala on Google Kubernetes Engine to serve 50M+ playlist requests daily with 99.9% uptime; built real-time event pipelines with Kafka/Scio processing billions of user interactions daily for Discover Weekly and Release Radar; optimized metadata with Cassandra tuning; contributed to .NET Core microservices and serverless patterns; containerized services with Docker and AKS; implemented advanced data storage strategies and monitoring; drove CI/CD pipelines and scalable infrastructure designs.

Frontend Engineer at Zalando

July 1, 2016 - July 1, 2018

Extended Zalando's wholesale platform with a full-stack B2B extension, integrating secure payments and multi-currency support; managed Firestore and Firebase Authentication on GCP; contributed to C#/.NET microservices using CQRS and Event Sourcing; implemented real-time pricing via WebSockets and Redux middleware; defined API contracts with Swagger/OpenAPI; containerized services with Docker and AKS; optimized PostgreSQL with partitioning and Redis-based caching; configured Nginx/Cloudflare for performance and security; supported CI/CD via GitHub Actions/Jenkins.

Software Consultant (Full Stack) at ThoughtWorks

June 1, 2014 - June 1, 2016

Delivered enterprise web applications using Ruby on Rails and React; provided agile consulting for fintech and healthcare clients; enhanced backend with Python/Java, applying OOP, SOLID principles, and data-structure optimizations to boost performance by approximately 25%; gained hands-on cloud experience with AWS and GCP for scalable deployments.

Frontend / Backend Engineer at Zalando

July 1, 2016 - July 1, 2018

Engineered a full-stack B2B platform extension, integrating secure digital payments and multi-currency checkout; managed Firestore and Firebase Authentication; developed C#/.NET 6 microservices with CQRS and Event Sourcing using Kafka; implemented real-time features with WebSockets; created API contracts and documentation with Swagger/OpenAPI; containerized services with Docker and deployed on AKS; tuned PostgreSQL with partitioning and Redis caching to reduce latency; optimized Cloudflare/Nginx configurations for performance and security.