John Mathew, Developer in Dallas, TX, United States
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John Mathew

Verified Expert  in Engineering

IT Security Developer

Dallas, TX, United States
Toptal Member Since
September 27, 2023

John has been a senior in identity and access management (IAM) for over a decade. He is skilled with diverse tools like Okta, Azure, and OneLogin. He is an expert in IAM standards like OpenID Connect (OIDC), the Security Assertion Markup Language (SAML), Fast IDentity Online (FIDO), OAuth, and System for Cross-domain Identity Management (SCIM) provisioning. John has experience with Workday, OIE upgrade, Jamf device trust, passwordless login implementations, and PIV card integration.


Confidential Client
Okta, Identity, Identity & Access Management (IAM)
Caliber Home Loans
Okta, Azure Active Directory, Identity & Access Management (IAM)
Azure, Azure Active Directory, Identity, Identity & Access Management (IAM)




Preferred Environment

Windows, Okta

The most amazing...

...things I've worked on are complex projects related to Okta passwordless authentication.

Work Experience

Identity and Access Management Engineer

2021 - 2023
Confidential Client
  • Oversaw the company's IAM services, handling everything from support and requirements gathering to development. Evaluated and adopted new technologies, implemented top-notch security protocols, and addressed security audit findings.
  • Designed and implemented processes for managing user identities in Okta Identity Engine (OIE), using HR as a master source, enforcing least privilege access, ensuring seamless user lifecycle management, and establishing role-based access controls.
  • Configured various IAM protocols, including SAML, OIDC, authorization servers, APIs, OAuth, etc.
Technologies: Okta, Identity, Identity & Access Management (IAM)

Identity and Access Management Engineer

2019 - 2021
Caliber Home Loans
  • Supported over 10,000 users in a multitenant Okta environment, gathering technical requirements and spearheading initiatives to minimize authentication friction while enhancing overall security measures.
  • Configured and supported various applications within the Okta ecosystem, including Office 365, Salesforce, and Adobe.
  • Used tools and technologies, including Okta AD agents, IWA, Radius, Microsoft Identity Manager, SIEM integration, RSA, Citrix, Cisco VPN, and federation, to secure access to the company's network and applications across multiple Okta tenants.
Technologies: Okta, Azure Active Directory, Identity & Access Management (IAM)

Azure Cloud Identity Engineer

2019 - 2019
  • Supported identity and access within the Azure identity team, which included handling daily tasks such as troubleshooting complex identity issues, particularly those related to Azure and multi-factor authentication (MFA).
  • Configured and troubleshot issues related to single sign-on (SSO), Azure Virtual Machines (VM), ADFS federation, Conditional Access policies, multi-factor authentication (MFA), Okta, Ping Identity, DUO, SAML, Kerberos, FIDO YubiKeys, and SSL.
  • Configured Azure AD connect for SSO, federation, and Secure Sockets Layer (SSL) certificates.
Technologies: Azure, Azure Active Directory, Identity, Identity & Access Management (IAM)

Cloud Identity Specialist

2019 - 2019
  • Conducted meetings with stakeholders to understand their specific requirements and translated them into a technical solution.
  • Established Workday as the source of truth for the identity system, using it as the master source.
  • Configured Okta lifecycle management to automate user onboarding and offboarding processes across various applications.
Technologies: Okta, G Suite, Slack, Identity & Access Management (IAM)

Technology Support Manager

2012 - 2018
Goldman Sachs Personal Financial Management
  • Provided technology support and oversaw identity management at United Capital. This included maintaining various aspects such as cloud services, servers, backups, security measures, desktop systems, firewalls, and phone systems.
  • Managed Okta, overseeing its configuration and implementing automated user provisioning and deprovisioning processes. Collaborated closely with vendors to plan, develop, and test various projects.
  • Configured SAML/OIDC applications to integrate them with Okta. Implemented MFA using Duo for enhanced security. Established security baseline policy and geo-login restrictions.
Technologies: Azure Active Directory, Identity & Access Management (IAM)

Tech Support Assistant Manager

2007 - 2012
Safe Fleet | Coban Technologies
  • Managed the most complex and high-priority environments. Promoted to assistant manager within the tech support group at Coban due to my exemplary performance.
  • Handled the installation and configuration of Windows servers, including planning, executing, and validating system software upgrades according to established schedules.
  • Collaborated directly with the software development team to address and resolve bugs and performance issues. Assumed technical writing responsibilities, which involved maintaining the user manual for our custom software.
Technologies: Azure Active Directory, HP Servers, Troubleshooting

Okta Passwordless Solution

Upgraded Okta to OIE and implemented Device Trust version 2, integrating it with Jamf for enhanced device trust capabilities. Additionally, I designed and enforced policies mandating users to sign in to critical applications exclusively from managed devices. Furthermore, I collaborated closely with the MDM team to deploy the Okta Verify desktop, contributing to the implementation of Okta's passwordless solution.
APRIL 2021 - APRIL 2023

Okta Certified Professional



G Suite, Slack


Azure, Windows, OneLogin




Azure Active Directory, HP Servers


Okta, Identity, Single Sign-on (SSO), Identity & Access Management (IAM), Passwordless Authentication, SCIM, OpenID Connect (OIDC), Troubleshooting

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