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Sebastián Vansteenkiste

@sebastinvansteenkist

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Senior .NET full‑stack engineer and engineering manager focused on reliable delivery.

Spain

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What I'm looking for

I seek a collaborative, change-embracing team where I can lead technical delivery, mentor engineers, and tackle challenging problems with empathy and professional courtesy.

I am a senior software engineer and engineering manager with 12+ years of professional experience delivering .NET-based solutions across startups and large enterprises. I have worked as an individual contributor, tech/team lead and line manager for distributed, multicultural teams, coordinating releases, resolving conflicts and improving development practices.

My technical core is the .NET ecosystem including Blazor and Xamarin, complemented by Python, JavaScript/React, Node.js and Azure infrastructure. I have led the design and implementation of backend APIs, micro-frontends, CI/CD pipelines, and integrations with external systems while championing TDD, documentation and cross-team collaboration.

I look for roles where change is embraced, difficult conversations are handled with empathy, and technical excellence aligns with clear product goals. I bring hands-on engineering, hiring and mentoring experience, and a proven record of delivering maintainable, well-documented systems in complex environments.

Experience

Work history, roles, and key accomplishments

Software Engineering Manager

Hitachi Energy

Sep 2024 - Dec 2025 (1 year 3 months)

Led a distributed full-stack team of 10 on the Digital Passport System, improving release coordination, documentation, and deployment processes while resolving team conflicts and conducting performance reviews.

C++.NET SQL Team Leadership Release Management Azure CI CD Technical Documentation

Senior Fullstack Developer

KopiusTech

Apr 2023 - Jul 2024 (1 year 3 months)

Developed a Blazor+Piral micro-frontend module for a US health-sector client, driving TDD-based feature delivery, CI/CD releases, cross-team coordination, and technical documentation.

C++Blazor Piral GraphQL MS SQL Server TDD CI CD

Senior Backend Developer

Svitla

Jul 2022 - Mar 2023 (8 months)

Contributed to a patented fintech platform using .Net and Azure, stabilizing and standardizing APIs and documenting architecture and business logic.

C++.NET Azure API Design Swagger Documentation Jira

Senior Fullstack Developer

CloudX

Jul 2021 - May 2022 (10 months)

Maintained multiple client projects with C# REST APIs and React frontends, supporting fullstack development and database work across diverse industries.

React Angular C++.NET Core Azure DevOps MongoDB SonarQube

Independent Senior Developer

ThinkerSys

Jul 2018 - Jun 2021 (2 years 11 months)

Delivered Python/Django web applications and React SPAs for NGO and client projects, owned deployments on Linux/Azure, and implemented integrations with third-party services.

Python Django React Azure Functions SQL CosmosDB DevOps

Senior .Net Developer

Globant

Mar 2017 - Jul 2018 (1 year 4 months)

Led teams to build Xamarin mobile apps and backend services, coordinating with stakeholders and delivering cross-platform mobile solutions for enterprise clients.

C++Xamarin Mobile Development Team Leadership Moq

Programmer / Scope Lead

Accenture

Mar 2014 - Feb 2017 (2 years 11 months)

Developed enterprise features and automation for internal CIO projects, resolved complex SQL issues, and created tooling to improve team productivity.

VB.NET C++SQL JavaScript Team Collaboration Visual Studio