Adrián Calleja PolancoSharePoint & Microsoft 365
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Senior developer · Microsoft 365

Hi, I’m Adrián. I build SharePoint and Microsoft 365 for businesses.

I’ve spent 4+ years designing and delivering enterprise solutions across Microsoft 365 and Azure: SharePoint Framework (SPFx) with React and TypeScript, Microsoft Graph and REST integrations, and automation with Power Automate and Power Apps. I’ve led the architecture and modernisation of large SharePoint Online environments, cloud migrations and CI/CD with Azure DevOps.

See my servicesGet in touch
years in Microsoft 365
4+
users on the portals I build for
300,000+
departments on a single platform
16
consultancies, with clients in banking, industry and government
4

Experience

Four consultancies and projects for government, banking and multinationals.

  1. Sogeti

    Oct 2025 – present

    Senior M365 Developer · Technical Lead

    Technical lead and solutions architect: I define scalable SharePoint architectures and engineering standards for delivery teams, and lead the design and build of SharePoint Online solutions for enterprise and public-sector clients.

    • Custom development for a regional government’s portals, used by 300,000+ people across 16 departments, optimised to the limit so SharePoint Online holds up at that scale.
    • Migrated legacy JavaScript components to modern SPFx web parts, owning the architecture and functional design end to end.
    • A reusable base web part (services, state, error handling and UI patterns) that speeds up development across the team.
    • Site-specific conditional navigation, which SharePoint doesn’t offer out of the box, and server-side pagination for 5,000+ item lists without throttling errors.
    • Secure integrations with corporate services over OAuth 2.0 (Keycloak and Azure API Management), plus Power Apps and Copilot agents for internal processes.
    • SPFx
    • React
    • TypeScript
    • Microsoft Graph
    • OAuth 2.0
    • Azure API Management
    • Power Apps
    • Azure DevOps

  2. Viseo

    Apr 2025 – Nov 2025

    M365 Developer

    Full lifecycle of a SharePoint Online engagement for a Swiss-headquartered multinational: client communication, requirements, architecture and development.

    • End-to-end modernisation of the employee portal, from a legacy SharePoint site to a modern, responsive and automated one.
    • Scattered Power Automate flows consolidated into a single SPFx and TypeScript solution that’s easier to control and maintain.
    • Automated multilingual content, with an external translation API wired into Power Automate.
    • SharePoint Online
    • SPFx
    • React
    • TypeScript
    • Power Automate
    • Power BI
    • SQL Server

  3. Hiberus

    Jul 2023 – Apr 2025

    M365 Developer

    SPFx components and Azure Functions (.NET/C#) for national and international clients, SharePoint and Entra ID administration with PowerShell, and the full SDLC in Azure DevOps.

    • Swiss multinational: Confluence to SharePoint Online, and SharePoint Server to Online with ShareGate, keeping data and permissions intact.
    • SPFx web parts with Redux and the Context API, and Confluence pages embedded in SharePoint.
    • Two banks: SPFx web parts, sector-specific data and permission logic, and Power Automate flows for complex permission cases.
    • SPFx
    • React
    • Redux
    • Azure Functions
    • PnP PowerShell
    • Entra ID
    • ShareGate
    • Azure DevOps

  4. Inetum

    Jan 2022 – Oct 2022

    Intern software developer

    First role: building and maintaining the company’s main web application in a Kanban team.

    • Java
    • Spring
    • Hibernate
    • JSF
    • PostgreSQL
    • Oracle

Selected work

  • Public sector

    SharePoint for 300,000+ users

    Custom development for a regional government’s portals, tuned for that scale: 5,000+ item lists without throttling, server-side paging, batched and cached requests.

    • SPFx
    • React
    • Performance
  • Multinational

    Quality portal, from SharePoint Server to Online

    I moved the quality (QA) portal to SharePoint Online and modernised the whole process, automating and streamlining its workflows.

    • SPFx
    • Power Automate
  • Internal AI

    Copilot agents to track AI adoption

    Agents that gather how AI is being adopted across the company and classify that information automatically.

    • Copilot
    • Microsoft 365
    • AI

What I work with

SharePoint & SPFx
  • SharePoint Online
  • SPFx
  • React
  • TypeScript
  • Fluent UI
  • Redux
  • PnP
Integrations
  • Microsoft Graph
  • REST APIs
  • Entra ID
  • OAuth 2.0
  • Azure API Management
  • Keycloak
Power Platform & AI
  • Power Automate
  • Power Apps
  • Power BI
  • Copilot agents
Azure & DevOps
  • Azure Functions (.NET/C#)
  • Azure DevOps (CI/CD)
  • PowerShell (PnP, SPO)
  • SQL Server
Migration
  • ShareGate
  • SharePoint Server → Online
  • Confluence → SharePoint

Certifications

  • Microsoft Certified: Azure Fundamentals (AZ-900)
  • Microsoft Certified: Azure AI Fundamentals (AI-900)

I also take on projects

For companies that want their SharePoint intranet without waiting months: I build it, migrate their documents and add AI on the Microsoft 365 they already pay for, working directly with them at a fixed price.

  • SharePoint intranet
  • Document migration
  • Document governance
  • AI on Microsoft 365
  • Monthly administration
See services
Video of a custom-built intranet with its AI assistant

Let’s talk

Write to me about a project, a collaboration or a role. I reply within one or two working days.

adrian190401@gmail.comLinkedIn