SQL Developers Hiring Guide

Your Gateway to Database Management

Databases are the heart of your businesses. After all, without databases, you wouldn’t have data. And without data, your business would struggle to remain competitive in a world that is constantly growing more and more so.

Databases come in all shapes and sizes. And although NoSQL databases have become the de-facto standard for enterprise businesses that depend on very large amounts of data, the relational database is still a crucial component. Even when there are plenty of GUI tools available to manage the various relational databases (such as phpMyAdmin), the single best method of working with those databases is the command-line Structured Query Language (SQL).

SQL (pronounced “sequel”) was developed by Donald D. Chamberlain and Raymond F. Boyce at IBM. The initial release was in 1986 and, since then, the language became the standard for relational database management. SQL can work with databases such as:

  • MySQL
  • MariaDB
  • Oracle
  • Sybase
  • Microsoft SQL Server
  • Access
  • Ingress
  • PostgreSQL

SQL is so prevalent, you’d be hard-pressed to successfully manage a corporate database without it. But SQL isn’t a language that is easily picked up by the average user. In fact, many consider SQL to be a very specialized language, which is why the database administrator is a very specific job. In order to become a successful DB admin, you must learn the SQL query language.

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    Hiring Guide

  • SQL Developers Hiring Guide 9

    Interview Questions

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    Job Description

One thing to keep in mind about database administration is that this job can’t exist in a silo. At one point in time that might have been the case, but because so many types of applications (such as web and mobile apps) now depend on databases, it has become imperative that DB admins can collaborate with developers and designers. And, in some cases, developers must also be familiar with many of the SQL queries, otherwise, they wouldn't be able to integrate their apps with databases.

Because of this, your company will probably have to rethink how to search for and hire database administrators. This is especially so if you're looking to expand your business with web or mobile applications that depend on databases to function. For that, you'll want to hire developers who are not only solid with their programming language of choice (such as Java, JavaScript, .NET, PHP, Python, Ruby, and C++) but also SQL. 

When those developers have the skills to run SQL queries, they are better capable of troubleshooting and debugging issues between their apps and the databases those apps depend on.

And considering one of the most popular mobile app databases is SQLite, which also uses SQL, it's in your best interest to hire developers who have (at least) a fundamental understanding of the SQL query language. In fact, without such knowledge, those developers would struggle.

The good news is that most engineers usually have a solid understanding of SQL. And you shouldn't have to worry about finding a software engineer who has a DB admin-level understanding of SQL. For that, you'll want to also hire an actual database administrator. Both ways will have SQL covered quite well.

Whether those developers have a fundamental or an expert level knowledge of SQL, it is, without a doubt, a language your company must invest in. But if you do hire a developer with only a cursory knowledge of SQL, you'll need to make sure they hone those skills quickly. Considering how so many applications are dependent on databases, there's no way around the requirement.


If your business has any plans on rolling out either web or mobile applications, you'll need developers who understand SQL and probably a DB admin to serve as the staff expert. Without data, the software you depend on (or distribute to clients and/or consumers) will lack modern functionality. Because of this, SQL should be considered a necessity.

What does DBMS Stand For?

DBMS stands for Database Management System.

What is SQL?

SQL stands for Structured Query Language and is the tool used for querying and managing relational databases.

What are tables and fields?

A table is an organized collection of data, formed by rows and columns. Fields are the columns in a table.

What are the 7 Constraints in SQL?


What is a primary key?

The primary key identifies each row in a table and must contain UNIQUE values and have an implicit NOT NULL constraint.

What is the UNIQUE Constraint?

The UNIQUE constraint ensures that all values in a column are different.

What is a FOREIGN Key?

A FOREIGN KEY is either a single field or a collection of fields that refer to the PRIMARY KEY in another table.

What is a Join?

A join is used to combine records from 2 or more tables in a SQL database based on a related column between the two tables.

What is an Index?

An index is a data structure that provides for quick lookups of data in table columns.

What is Data Integrity?

Data integrity is the assurance of accuracy and consistency of data over the entire lifecycle of a database.

We are looking for a developer familiar with the SQL query language to analyze, design, and support applications that require database integration. Your job will include developing SQL databases and writing applications that interface with those databases. 

The ideal candidate will be fluent in both the basic and more complex queries available with SQL. You might be required to work with a number of databases, so a solid understanding of those platforms will be helpful. 


  • Develop high-quality database solutions to be used for web, mobile, and desktop applications.
  • Build, implement, and optimize stored procedures and functions using T-SQL.
  • Review and interpret ongoing business report requirements.
  • Research required data.
  • Build appropriate and useful reporting deliverables.
  • Analyze existing SQL queries for performance improvements.
  • Suggest new queries.
  • Develop procedures and scripts for data migration.
  • Provide timely scheduled management reporting.
  • Investigate exceptions with regard to asset movements.
  • Integrate user-facing elements developed by front-end developers with server-side logic.
  • Write reusable, testable, and efficient code.
  • Design and implement low-latency, high-availability, and performant applications.
  • Implement security and data protection.
  • Integrate data storage solutions.

Skills And Qualifications

  • Degree in Computer Science or related field.
  • At least 5 years experience with SQL and database administration.
  • Solid understanding of more than one relational database.
  • Excellent skills with the languages you were hired to develop with.
  • Understanding of the principles behind scalable applications.
  • Fundamental understanding of version control systems (such as Git).
  • Solid problem-solving skills.
  • Excellent written and verbal communication.
  • Good organizational skills.
  • Ability to work as part of a team.
  • Attention to detail.
  • Understanding the nature of asynchronous programming and its quirks and workarounds
  • A positive attitude.

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