Peter K.
Senior Software Engineer
Experience
Oct 2022 - Oct 2025
3 years 1 monthRomania
Senior Software Engineer
LiftUP
- Led AI/LLM training project leveraging Ruby and Python, integrating multi-language datasets, optimizing model performance, and annotating complex data samples.
- Designed and implemented containerized LLM training environments using Docker and Kubernetes, ensuring reproducible deployments and scalable infrastructure across cloud providers.
- Performed extensive code review and debugging in Ruby and Python, identifying code smells, anti-patterns, and optimizing application performance in AI pipelines.
- Implemented CI/CD pipelines using GitHub Actions and Jenkins, automating testing, deployment, and monitoring of LLM projects for consistent delivery.
- Collaborated with data engineers and solution architects to benchmark AI models, analyze outputs, and refine training datasets to improve accuracy by over 20%.
- Developed internal Ruby scripts for automation of repetitive tasks, including data cleaning, preprocessing, and sandboxed agent-based code execution for LLM evaluation.
- Documented high-quality technical notes, test results, and defect tracking to ensure maintainability and reproducibility across multiple AI projects.
- Mentored junior engineers in Ruby, Python, and containerized development practices, fostering knowledge sharing on AI model training and deployment.
- Integrated monitoring tools such as Prometheus and Grafana to track model performance, system metrics, and infrastructure health across environments.
- Optimized multi-language LLM training workflows, reducing resource usage and training time while maintaining model accuracy and stability.
- Developed APIs and data pipelines to feed training data efficiently into LLMs, ensuring compliance with data security and governance policies.
- Collaborated with project leads to adapt guidelines for new AI domains, ensuring flexible adoption and continuous improvement in model quality.
Mar 2020 - Sep 2022
2 years 7 monthsFaro, Portugal
Senior Full Stack Engineer
SOFTLOFT
- Developed and maintained web applications using Ruby on Rails and React, integrating AI-assisted code review tools to improve developer productivity.
- Implemented containerized development and deployment workflows using Docker and Kubernetes, reducing release cycle times by 30%.
- Built and integrated REST and GraphQL APIs to enable real-time data flow between AI tools and frontend applications.
- Collaborated with cross-functional teams to optimize ML-powered features and enhance system performance and scalability in client-facing applications.
- Led technical design and code review sessions to ensure adherence to best practices, OOP principles, and Ruby idioms across projects.
- Developed automation scripts in Ruby for data processing and testing, improving code quality and reducing manual intervention.
- Integrated monitoring and logging solutions, including Grafana and ElasticSearch, to ensure system reliability and quick incident resolution.
- Documented development processes, test coverage, and AI integration approaches for future onboarding and maintenance purposes.
- Participated in LLM pilot projects by validating prompt generation, evaluating outputs, and providing actionable feedback to improve model performance.
- Mentored junior engineers in full-stack development and best practices for code quality, testing, and deployment automation.
- Engaged with project leads to assess AI integration opportunities, delivering insights to enhance product features and user experience.
Apr 2019 - Mar 2020
1 yearCupertino, United States
Full Stack Developer
Sibedge
- Implemented web applications using Ruby on Rails and React, supporting automated data processing and testing pipelines for AI/ML experiments.
- Developed CI/CD workflows using GitLab CI and Docker, streamlining deployment of multi-language applications and improving system reliability.
- Performed Ruby code reviews, refactored legacy code, and addressed test gaps to maintain high-quality standards in production environments.
- Built APIs and integrated third-party services to enhance application functionality, focusing on AI-driven data workflows and user interactions.
- Created and maintained technical documentation, defect tracking, and test reports to support knowledge sharing and reproducibility.
- Supported pilot AI projects by evaluating generated outputs, documenting anomalies, and refining workflows to improve LLM performance.
- Optimized database queries and data pipelines for high-performance data handling, ensuring accurate and efficient AI model training.
- Collaborated with DevOps teams to deploy containerized solutions and manage environment configurations for AI experiments.
- Mentored team members on best practices in Ruby, automated testing, and CI/CD, fostering technical growth and productivity.
May 2016 - Mar 2019
2 years 11 monthsPoznań, Poland
Junior Full Stack Developer
Netguru
- Assisted in building full-stack applications using Ruby on Rails, React, and PostgreSQL, contributing to data processing and AI model integration tasks.
- Participated in code reviews, learning Ruby best practices, OOP principles, and testing methodologies to improve code quality and maintainability.
- Supported CI/CD pipeline setup with GitHub Actions, ensuring smooth deployment of web applications and automated test execution.
- Developed helper scripts and small modules in Ruby and Python to preprocess data for internal AI and analytics projects.
- Documented development tasks, test cases, and bug reports to improve project transparency and team collaboration.
- Worked with containerized environments using Docker to develop, test, and deploy applications consistently across platforms.
- Assisted in integrating APIs and external services, gaining experience in automation and AI-powered tool adoption within projects.
- Collaborated with senior developers to troubleshoot issues, debug applications, and learn best practices in full-stack software engineering.
Summary
Accomplished software engineer with 9+ years in full-stack development, cloud-native architecture, and AI/LLM projects.
Experienced in Ruby, Python, and containerized environments.
Adept at code review, CI/CD integration, and training AI models across multiple domains.
Languages
Polish
AdvancedRomanian
IntermediateEnglish
ElementaryPortuguese
ElementaryEducation
Oct 2012 - Jun 2016
University of Technology Koszalin
Bachelor of Science · Computer Science · Koszalin, Poland
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