Looking for a job

david kapitan

@davidkapitan

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Backend-oriented full stack engineer building scalable cloud-native systems.

Slovakia

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What I'm looking for

I seek backend- or cloud-focused roles building scalable, secure, real-time systems with strong ML/data integration, collaborative teams, and opportunities to improve performance and compliance.

I am a backend-oriented Full Stack Software Engineer specializing in Python, Golang, and Node.js, focused on building scalable APIs, distributed systems, and cloud-native applications for finance and healthcare. I design microservices, event-driven architectures, and data pipelines that meet strict regulatory frameworks such as HIPAA and PCI-DSS.

At Visa I implemented low-latency payment pipelines, AI-powered anomaly detection, vector search, and federated learning solutions; at Bayer I developed large-scale claims processing systems, FHIR/HL7-compliant APIs, and predictive analytics for fraud detection. I have led cloud migrations, optimized large-scale databases, and delivered production-grade observability and security integrations.

I bring a pragmatic, security-first engineering approach, with strong experience in real-time streaming, machine learning integration, and frontend integrations (React, Angular, Vue) to deliver end-to-end solutions. I enjoy mentoring teams, improving system performance, and designing systems that scale to millions of users.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Engineer

Current

Visa

Feb 2023 - Present (2 years 9 months)

Designed and implemented scalable microservices and low-latency payment pipelines using Python and Go, and developed ML-based anomaly detection and real-time data platforms to strengthen fraud prevention and dispute resolution.

Python Golang fastAPI Kafka PyTorch GraphQL Kubernetes PostgreSQL

Backend Developer

Bayer

Apr 2019 - Jan 2023 (3 years 9 months)

Developed cloud-native healthcare claims and interoperability platform using Python and Node.js, building FHIR/HL7-compliant APIs, ETL pipelines, and predictive analytics to improve claims processing and HIPAA compliance.

Python Django Node AWS FHIR Apache Airflow XGBoost PostgreSQL

Full Stack Developer

Sytoss

May 2014 - Mar 2018 (3 years 10 months)

Built and maintained enterprise web applications and multi-tenant SaaS platforms with Python and Node.js, optimizing databases and automating ETL and backend workflows to improve performance and scalability.