A guide to hiring a SAML developer
SAML is a standard that lets a person sign in to many apps with one company account. If you sell software to businesses, sooner or later a customer will ask for it, often during a security review. A SAML developer adds that login to your product, connects it to each customer’s login system and fixes it when something fails. Here is what the job includes, how to judge a candidate and how to work well with a remote engineer. It is most useful for founders and product leads who sell to companies and need single sign-on without slowing down the rest of the roadmap.
What SAML does, in plain words
When a user opens your app, the app sends them to their company’s login system, called the identity provider. The user signs in there. The identity provider then sends back a signed message that says who the user is. Your app checks the signature, reads the details and lets the user in. The user never types a password into your app, and the company can switch off access in one place when someone leaves.
What a SAML developer is responsible for
The job covers your side of the exchange and the connection with each customer. The developer builds the sign-in and sign-out flow, checks signed messages, turns the user details into accounts and roles, and writes clear setup steps for customers. They also deal with certificates, which expire, and with the many small differences between login systems such as Okta, Microsoft Entra ID and Google Workspace.
How a SAML developer differs from other roles
A back-end developer builds the server side of your product and may not have worked with company login systems before. A software developer covers general product work. An IT support specialist manages the accounts and apps inside a company, which is the other side of the same connection. A SAML developer sits between them, with deep knowledge of one standard and the habits that keep logins secure.
When a SAML developer makes sense
- A business customer or a large prospect asks for single sign-on before they buy.
- Your current SAML login fails for some customers and nobody can say why.
- You use a login service and need someone to connect it to your app and map users.
- You are adding company accounts or teams to a product that started with simple passwords.
- A signing certificate is about to expire and you want a safe plan.
If you only need to manage accounts for your own staff, an IT specialist is the better fit. If your customers use newer standards, ask a candidate about OpenID Connect too.
Security comes first
Login code is a target, so a developer should treat it with care. Signed messages must be checked in full, including who they are for and when they were made. Secrets and keys should live in a secure store and not in the code. Ask candidates how they test for common mistakes and how they would respond if a problem was found. This guide is general information, and your own security team or adviser should review the final design.
Reading a SAML developer’s background
Ask for examples where they connected a real identity provider or solved a hard login failure. Good answers describe the symptom, the cause and the change. Be careful with a background that says only that someone used a library. Libraries help, but the hard part is the many settings, the customer differences and the safe handling of errors.
Interview questions to try
- Walk us through what happens from the moment a user clicks sign in to the moment they see our app.
- What do you check in a signed response before you trust it?
- A customer says their staff cannot sign in. What do you ask for, and what do you look at first?
- How do you plan a certificate renewal without locking users out?
- How would you let each customer connect their own login system?
Listen for a clear order of steps and for examples from real projects. Doubt anyone who answers with a library name and no reasoning.
Try a paid mini project
Hand each finalist a small task based on your own setup. Useful examples are a review of your current sign-in flow with a list of risks, a plan for adding SAML to your product, or a written guide your customers could follow to connect their provider. Pay for the time. Look at how careful the thinking is and how well the person explains it to someone who is not technical.
Agree access and routine
Give your developer a test environment and test accounts, and keep production keys with your own team. Agree who talks to customers during setup, how problems are reported and how fast fixes are expected. Ask for a short written note for each customer connection, with the settings used. Remove access when the work ends.
Working with your team
Tell your sales and support teams what single sign-on will and will not cover. A shared page with setup steps for each identity provider saves time on every new customer. A short weekly call and a shared list of tasks keep everyone aligned.
Mistakes to avoid
- Trusting a signed response without checking who it is for and when it was made.
- Letting a certificate expire because no one owned the renewal.
- Testing with real customer accounts instead of test ones.
- Keeping signing keys or secrets inside the code.
Want to look at the wider role? See our software developers for product work, or our IT support specialists for managing company accounts and apps.