Available to hire
Hello, I’m Piotr Maksymiuk, a Senior Software Engineer with 10+ years of experience delivering scalable eCommerce and web solutions. I specialize in Shopify development, Liquid templating, and advanced frontend engineering to build robust storefronts that perform under heavy traffic.
I enjoy turning complex requirements into clean, maintainable code, collaborating with cross-functional teams, and continually improving user experience and storefront performance. I’m passionate about documentation, accessibility, and delivering measurable business value through robust engineering practices.
Skills
Work Experience
Senior Backend / Platform Engineer at Santander UK
December 1, 2025 - PresentDeveloped scalable backend services using Java and Go to support high-volume financial transactions. Built secure microservices architectures ensuring compliance and reliability across distributed services. Implemented event-driven data processing with Kafka to reduce latency in critical transaction workflows. Improved cloud deployments on AWS for scalable service availability and designed secure APIs for data exchange across platforms. Strengthened observability with Prometheus and Grafana and integrated CI/CD pipelines to accelerate release cycles.
Senior Software Engineer at SOTEC CONSULTING
January 1, 2023 - December 1, 2025Architected scalable backend systems using Python and Scala, boosting platform throughput by 40% across distributed cloud environments. Designed microservices with Kubernetes and Docker, improving deployment consistency and provisioning speed. Built high-performance Kafka-based data pipelines and PySpark workloads, enabling terabyte-scale streaming with low latency. Optimized cloud usage across AWS and GCP, cut costs through automation, and integrated Databricks-based analytics for faster insights. Led CI/CD pipelines using Git and Prow, improving release velocity and reducing errors. Implemented monitoring with Prometheus and Grafana for better observability.
Senior Software Engineer at Aztec
January 1, 2019 - December 1, 2022Designed and developed scalable Python and Java backends, built distributed systems with Kafka, and implemented ETL pipelines using Spark and PySpark for large datasets. Deployed containerized apps with Docker and Kubernetes, improved portability and reliability. Optimized MySQL and Redis performance, collaborated with data science teams to deploy ML models, and established monitoring with Grafana and Prometheus. Led backend architecture improvements and implemented CI/CD workflows to reduce technical debt and speed up delivery.
Software Engineer at B3 Consulting Poland
January 1, 2015 - December 1, 2018Developed Java and Python backends for enterprise clients, built microservices to improve modularity and independent deployments. Designed Spark-based data processing workflows for large-scale analytics, provisioned cloud resources on AWS, and integrated APIs for seamless platform interoperability. Optimized performance with profiling and indexing, introduced Docker-based containerization, and established monitoring and logging to improve reliability. Mentored junior engineers and contributed to scalable system design and long-term technology strategy.
Software Developer at HashMicro
August 1, 2013 - December 1, 2014Developed backend applications in Java and Python for ERP systems, designed MySQL schemas and optimized queries, and built REST APIs for cross-module integration. Contributed to feature development, unit testing, and debugging across production environments, and supported deployment with Git-based workflows. Implemented performance improvements and collaborated with team on system architecture and data flow.
Senior Shopify Developer at Santander UK
December 1, 2025 - PresentArchitect custom Shopify theme enhancements using Liquid, JavaScript, and CSS, improving storefront conversion rates and enabling personalized experiences across multiple product categories. Implement dynamic sections and components to support personalized customer journeys. Diagnosed critical production issues affecting checkout flows, reducing cart abandonment through optimized debugging. Integrated third-party APIs and payment solutions to ensure seamless transactions and data synchronization. Refactored Liquid templates to optimize page load times, achieving faster rendering. Collaborated with designers and product managers to translate requirements into scalable features, and conducted code reviews to ensure quality. Implemented advanced analytics tracking to inform decisions and improved cross-browser accessibility.
Education
Master of Computer Science at National University of Singapore
January 1, 2012 - January 1, 2013Bachelor of Computer Science at National University of Singapore
January 1, 2008 - January 1, 2012Master of Computer Science at National University of Singapore
January 1, 2012 - December 31, 2013Bachelor of Computer Science at National University of Singapore
January 1, 2008 - December 31, 2012Qualifications
Industry Experience
Software & Internet, Professional Services, Financial Services, Retail
Skills
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