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Mariusz Śliwowski

@mariuszliwowski

Software Engineer at Pockit Limited who maintained Java services on AWS and developed .NET systems and BI workflows.

At Pockit Limited, I maintained, developed, and optimized Java backend services and API flows on AWS following a corporate merger. I also participated in the independent development and maintenance of both .NET and Java systems.

At Pockit Limited, I designed and supported ETL workflows and database structures in MS SQL Server for business reporting. Earlier, I designed and migrated enterprise web applications with .NET Core, C#, ASP.NET MVC, and Azure.

At intive GmbH, I developed and maintained B2B applications and internal systems in .NET Core, and optimized SQL queries and database schemas. I’ve also developed software at Tide Software sp. z o. o., Softech s. c., and X-Code sp. z o. o.

Experience

Work history, roles, and key accomplishments

Software Engineer / Full-Stack & BI Developer

Pockit Limited

Aug 2017 - Jun 2026 (8 years 10 months)

Progressed through technical pivots and corporate restructuring to support critical backend, BI, and cross-platform initiatives. Cross-skilled into Java, PostgreSQL, and AWS to ensure business continuity during a corporate merger.

C#.NET Core MS SQL Server ASP.NET MVC Angular Azure Java AWS PostgreSQL Git Jira BIツール ETL Data Warehouse Azure Data Factory SSIS Azure Data Lake

Senior Software Engineer

intive GmbH

Sep 2016 - Aug 2017 (11 months)

Developed and maintained enterprise-level B2B applications and internal systems within the .NET Core ecosystem. Authored, tuned, and optimized complex SQL queries and database schemas to ensure high performance and reliability.

C#.NET Core MS SQL Server ASP.NET MVC Angular Azure Git

Software Developer

Tide Software sp. z o. o.

May 2016 - Sep 2016 (4 months)

Developed full-stack application features, implementing both the user interface and core backend business logic. Authored and optimized complex MS SQL Server queries to ensure efficient data management and seamless database integration.

C#XAML MS SQL Server WCF Silverlight TFS

Software Developer

Softech s. c.

Oct 2011 - Apr 2016 (4 years 6 months)

Developed and maintained a portfolio of core business applications, ensuring high availability, system stability, and continuous support for legacy desktop software. Engineered new web applications from scratch, aligning technical implementation with modern web development standards and business specifications.

C#Windows Forms MS SQL Server ASP.NET MVC SVN

Junior Software Developer

X-Code sp. z o. o.

Apr 2010 - Aug 2010 (4 months)

Engineered end-to-end application components within the ASP.NET ecosystem, handling server-side development and UI integration. Implemented database-level business logic, focused on authoring stored procedures and handling efficient data retrieval to support application features.

C#ASP.NET MS SQL Server SVN