Kas Tsaedu, Developer in Washington, United States
Kas is available for hire
Hire Kas

Kas Tsaedu

Verified Expert  in Engineering

DevOps and Software Developer

Washington, United States
Toptal Member Since
February 5, 2023

Kahsay is an Office 365 engineer with over 10 years of experience working on numerous projects, including administrating, designing and deploying infrastructure, mailbox migration, email security solutions, and Azure AD. He is passionate, organized, and meticulous about planning, always focusing on delivering the right solution. While he has a good technical background, he strives for simple and elegant solutions to solve the most complex of problems.


Windows PowerShell, Microsoft Exchange Online, Troubleshooting, Gmail...
Windows PowerShell, MS Exchange, Microsoft Exchange Server, Email Protocols...
Networking, IT Helpdesk, Desktop Support, SMTP, Email, Office 365




Preferred Environment


The most amazing...

...migrations I've led are tenant-to-tenant multiple mailboxes from on-premises to the cloud from third-party providers like G Suite to Office 365.

Work Experience

Senior O365 Engineer

2020 - 2023
  • Gave expert-level technical support to Cloud-based MS customers, such as Office 365, exchange online, SP online, Teams Outlook, security, and compliance, MS endpoint management (Intune), Microsoft Defender for 365, Azure AD, and eDiscovery.
  • Led effort to improve outbound email authentication rates across many high-volume domains and business units, including SPF, DKIM, and DMARC, within a large complex messaging environment, leading to improved authentication rates.
  • Improved company's security using Azure AD permission, conditional access policy, MFA, identity and access management, RBAC, Azure Security, SSO in Azure AD, and group policies. I'm an expert in MFA, SSPR, CBA, and IAM like SAML, OpenID, and OAuth 2.
  • Managed mailbox migration from on-prem to cloud and complex messaging migration scenarios, including Hybrid Office 365 configuration. Acquired knowledge of migration best practices and troubleshooting.
  • Led the mailbox migration process, MS teams, and SharePoint files from private to public cloud environments and tenant-to-tenant migration using tools like Sharegate, Quest on Demand, Bit Titan, and Microsoft built-in migration tools.
  • Implemented automated, manual, or PowerShell methods to migrate mail, rules, contacts, and calendar from Gmail to Office 365. Hands-on experience migrating mailboxes from Google Workspace (G Suite) and more IMAP-based email servers to Office 365.
  • Acquired demonstrable knowledge of migration best practices and pre- and post-migration troubleshooting skills using PowerShell and logs.
  • Provided hands-on customer support for Exchange Online, Microsoft security solutions, Outlook, enterprise security, and compliance, M365/O365 web apps, MS365 Admin Centre, SharePoint, OneDrive, MS Teams, and Azure AD portal.
  • Managed user accounts, permissions, and groups. Created and managed SharePoint sites, libraries, and lists. Enforced security policies and managed permissions. Fixed issues on SP functionality, performance, and integration with other systems.
  • Migrated SharePoint files and resources from on-premises to cloud and tenant-to-tenant. I'm an expert on SP migration tools, migration using migration manager, and other 3rd-party SaaS solutions like Sharegate, Quest On Demand Migration, etc.
Technologies: Windows PowerShell, Microsoft Exchange Online, Troubleshooting, Gmail, Office 365, SharePoint 365, SharePoint 2016

Exchange Online Administrator

2017 - 2020
  • Maintained smooth company workflow by managing Exchange 2013 and 2016 servers, Microsoft 365 exchange online, and technical support to end-users. Built strong relationships with team members by resolving staff problems using the PowerShell script.
  • Led migration efforts from on-premises to Office 365. Migrated 2,400 mailboxes, DL, resource mailboxes, and active users from on-premises to Exchange Online (Cloud) to create a hybrid deployment.
  • Set up and configured Exchange online accounts for over 2,500 users, retention policies, and eDiscovery management. Enforced email security and calendar policies. Managed users' permission, license, mailbox size, quota, and mail flow rules.
  • Spearheaded efforts to improve inbound email security controls by evaluating best-in-class providers, conducting pilots, and overseeing selected solutions' configuration, deployment, tuning, and maintenance.
  • Followed up and validated the health, status, operations, and maintenance of identity management systems such as Active Directory, Azure Active Directory, Directory Synchronization (AADC/DirSync), and Active Directory Federation Services (ADFS/CBA).
  • Worked as SP administrator, managing user accounts, OneDrive accounts, permissions, and groups. Gained experience in creating and managing SharePoint sites and libraries.
  • Configured policies like retention, information protection, OneDrive access policies, file management, security updates, and careful management.
  • Gained knowledge in SharePoint functionality, performance, and integration with other systems.
Technologies: Windows PowerShell, MS Exchange, Microsoft Exchange Server, Email Protocols, Azure Administrator, Troubleshooting, Office 365

IT Administrator

2015 - 2017
  • Collaborated with the Information Security and Network Team, supporting and maintaining our email firewall.
  • Provided hands-on support in installing new computer systems, resolving hardware issues, upgrading software, troubleshooting network systems, and providing general IT support.
  • Implemented the best available solutions to meet the needs of the organization. Analyzed feasibility and performed testing of new features as they became available.
  • Managed documentation of security processes, evaluated tooling in the ever-changing environment, and ensured we were secure.
  • Utilized Agari Brand Protection to analyze and monitor the status of email authentication solutions for compliance with phishing resistance solutions.
  • Improved enterprise desktop and email security solutions for busines stakeholders.
Technologies: Networking, IT Helpdesk, Desktop Support, SMTP, Email, Office 365

Data Analyst

2013 - 2015
Policy Studies Institute
  • Undertook research or policy gaps analysis, developing and administering survey collecting, organizing, and analyzing opinions and data, creating reports, analyzing data, and presenting the findings.
  • Organized and maintained research databases and analyzed data using tools like Stata, SPSS, Python, R, and Excel sheet.
  • Served as supervisor of research projects, communicating with team members and verifying that all projects and tasks were on schedule.
Technologies: Econometrics, STATA, SQL, Python, R, SharePoint 2016

Mailbox Migration

I led a migration process of mailboxes from on-premises to Office 365. Engaged in the project by collecting requirements and functional and technical design documentation and collaborated with project implementation.

I managed and ran the hybrid migration wizard, which creates a hybrid migration endpoint in the exchange center, and deployed the exchange hybrid. I led a team of engineers from on-premises and the cloud server and successfully migrated 2,400 users' mailboxes, DL, contacts, and calendars from on-premises to Office 365.
2011 - 2013

Master of Science (MSc) in Policy Analysis

Mekelle University - Mekelle, Ethiopia

2005 - 2008

Bachelor's Degree in Economics

Arbaminch University - Arbaminch, Ethiopia


Microsoft Certified: Power BI Data Analyst Associate



Microsoft 365 Certified: Exchange Online Support Engineer Specialty



Azure Fundamentals


APRIL 2022 - APRIL 2024

MuleSoft Certified Developer



API Development


MS Exchange, Azure Active Directory B2C (ADB2C), Microsoft Teams, STATA, Microsoft Exchange Online, Anypoint Studio


SharePoint 2016, Windows, Azure IaaS, MuleSoft, SharePoint 365


Microsoft Exchange Server, DataWare, Azure Active Directory


Python, SQL, R


Windows PowerShell


Migration, Email Authentication, Office 365, Econometrics, Computer Skills, Economics, Data Analysis, Database Analytics, Economic Analysis, Research, Troubleshooting, Data Analytics, Data Entry Analysis, Data Visualization, Azure Administrator, CloudHub, API Integration, Email Protocols, Networking, IT Helpdesk, Desktop Support, SMTP, Email, Gmail

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.


Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring