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Senior software engineer with 10+ years of experience architecting and delivering scalable cloud-native backend systems, secure APIs, and event-driven data pipelines using Python and Java. Experienced in FastAPI and Spring Boot, containerization with Docker and Kubernetes, and data management with PostgreSQL and MongoDB, with a focus on reliability, performance optimization, and secure development practices.…Senior software engineer with 10+ years of experience architecting and delivering scalable cloud-native backend systems, secure APIs, and event-driven data pipelines using Python and Java. Experienced in FastAPI and Spring Boot, containerization with Docker and Kubernetes, and data management with PostgreSQL and MongoDB, with a focus on reliability, performance optimization, and secure development practices.

Łukasz Eitner

Back-End Developer, Web Developer, Programmer, +2

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Senior software engineer with 10+ years of experience architecting and delivering scalable cloud-native backend systems, secure APIs, and event-driven data pipelines using Python and Java. Experienced in FastAPI and Spring Boot, containerization with Docker and Kubernetes, and data management with PostgreSQL and MongoDB, with a focus on reliability, performance optimization, and secure development practices.…Senior software engineer with 10+ years of experience architecting and delivering scalable cloud-native backend systems, secure APIs, and event-driven data pipelines using Python and Java. Experienced in FastAPI and Spring Boot, containerization with Docker and Kubernetes, and data management with PostgreSQL and MongoDB, with a focus on reliability, performance optimization, and secure development practices.

Available to hire

Senior software engineer with 10+ years of experience architecting and delivering scalable cloud-native backend systems, secure APIs, and event-driven data pipelines using Python and Java.
Experienced in FastAPI and Spring Boot, containerization with Docker and Kubernetes, and data management with PostgreSQL and MongoDB, with a focus on reliability, performance optimization, and secure development practices.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

Work Experience

Senior Software Engineer at Łukasz Eitner (listed as own profile/role)

March 1, 2024 - May 1, 2026

Architected a multi-tenant SaaS platform for enterprise clients using Python and Java microservices on Kubernetes, serving 150K+ daily API requests with 99.95% uptime. Migrated a legacy monolith to cloud-native architecture on AWS with zero downtime for end users. Built secure API gateways, event-driven pipelines with Kafka for real-time analytics, and CI/CD for zero-downtime deployments. Implemented security practices (OWASP, SAST/secure coding, encryption/access control) and delivered scalable solutions using React and Python/Flask.

Senior Software Engineer at Pragmatic Coders

January 1, 2020 - January 1, 2024

Software consultancy delivering custom digital platforms and IT services for enterprise clients, specializing in cloud-native solutions and agile delivery. Worked across backend and full-stack technologies including Python/Java APIs, React/TypeScript frontends, and containerized deployments on Docker and Kubernetes, integrating with AWS/GCP services and data stores such as PostgreSQL.

Senior Software Engineer at PayFit

November 1, 2017 - January 1, 2020

Payroll and HR SaaS platform automating payroll, benefits, and employee management for over 8,000 SMBs across Europe. Contributed to backend and distributed systems using Python and Java/Spring Boot, building secure REST APIs, event-driven components with Kafka, and deploying on Kubernetes with CI/CD pipelines. Delivered performance improvements, data accuracy/security enhancements (GDPR-aligned practices), and reliability improvements aligned with SLAs.

Software Engineer at Convoy

November 1, 2016 - October 1, 2019

Digital freight network matching shippers with carriers through real-time bidding and technology, optimizing truck utilization and reducing empty miles across North America. Built scalable backend services and data processing components using Java/Python, Docker/Kubernetes, AWS, Kafka, Terraform, and PostgreSQL/Elasticsearch, and supported real-time tracking and low-latency updates.

Junior Software Engineer at DueDil (now FullCircl)

February 1, 2015 - September 1, 2016

Business intelligence platform providing KYC, AML, and compliance data to financial institutions and regulated industries. Developed backend services and APIs with Python/Java and Flask, containerized deployments with Docker/Kubernetes, integrations using AWS, and frontend components with React. Followed security practices (OWASP/PCI-DSS) and CI/CD practices using GitLab CI.