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SQL is a language that has many applications, from online shopping, to database management, to online analytical processing.
SQL experts can help your company understand data management in a way that they never thought was possible, making it more productive than ever. Consult with an SQL expert for free today at Freelancer.com!
Post your project for free and connect with skilled SQL Experts ready to start today. Compare bids, ratings and portfolios, and only pay when you're happy with the work.
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No upfront cost · pay only when you're happy with the work
9.0
9.0
99%
Dublin, Ireland
$50 USD per hour
My name is Marcelo, and I am a 45-year-old professional programmer with over two decades of experience. Since 2003, I have specialized in coding a diverse range of Expert Advisors (EAs) and indicators for the MetaTrader platform, providing tailored solutions to clients worldwide. In addition, I have been actively trading live accounts since 2005, which enables me to incorporate practical market insights into every project I undertake. I hold a Bachelor's degree in Computer Science and an MBA in Project Management. My strong technical background and hands-on trading experience equip me to deliver high-quality, efficient, and innovative trading tools. ==> Why Choose Me? * Over 600 reviews rated 5.0 stars, reflecting a proven track record of excellence in Metatrader programming. * Experience developing projects of varying sizes and complexities, all concluded with 100% client satisfaction. * A commitment to providing professional quality and competitive pricing. ==> How I Can Help You Whether you need a simple indicator, a complex trading strategy automated, or custom EAs, I am here to help. I take pride in understanding your specific needs and translating them into reliable and efficient solutions. Please do not close the project before discussing your requirements with me—I am confident that I can offer the expertise and value you’re looking for. Thank you for considering my application. I am eager to collaborate with you and bring your trading ideas to life. Best regards, Marcelo Dublin, GMT+0
7.9
7.9
100%
dublin, Ireland
$40 USD per hour
Hi. I am a full stack developer with mobile and web skills. The area of my experience includes, but not limited to mobile and website development, maintenance and e-commerce development. I have been working with following skills for over 7 years. 1. Mobile development - Java, Kotlin, Android development, SDK - Objective-C, Swift, iOS app development - Flutter, React Native, Xamarin, Ionic, Cordova. 2. Web development - Php : Laravel, Codeignitor, Symfony - Javascript : Node.js, Angular 2/4/5/6, Angular.js, React.Js, Next.js, Vue.Js, Nuxt.js - Python : Django, Flask, Bottle - Ruby : Ruby on Rails - Golang : Gin Gonic, Buffalo - Database : Mysql, Mongodb, PostresSql, Sqlite - Ecommerce : Shopify, Magento, Woocommerce, Prestashop, Bigcommerce - Cloud : AWS, Azure, Google cloud 3. AI development. - Deep learning : Tensorflow, Pytorch, Keras, Caffe - Computer vision 4. Programming languages - C++, C#, Java, Qt, Python selenium
5.4
5.4
97%
Carlow, Ireland
$20 USD per hour
major skills: Node.js, Typescript, Koa2, MongoDB, HTTP, WebSocket, MQTT, Ionic2+, Angular2+, SASS, Typescript, Android, Objective-C, Cordova, Zepto.
7.4
7.4
100%
Tramore, Ireland
$43 USD per hour
My work experience began in embedded software development for home automation systems - C programming, microcontollers (PIC, Atmel AVR and STM32s), real-time operating systems, API design and communication protocols. Since then I have developed embedded software for a variety of applications - for both hobbyists and small companies. I have meaningful experience with server-side development and relational databases also - in Perl, Python and PostgreSQL primarily. I have a first-class Bachelors degree of Electrical & Electronic Engineering. To students / interns: I am happy to offer tuition, but I am not willing to facilitate plagiarism under any circumstances - so don't ever approach me asking me to do your project for you. Note: Don't take my hourly rate seriously. It may be (significantly) more or less depending on the job. I sometimes take on small jobs - partly to boost my knowledge in a particular technical area, partly for fun. Even if I manage to deliver such projects at a relatively low cost, please note that this is not necessarily indicative of my usual hourly rate. I'm not obliged to offer the same 'low-cost' terms to everyone I work with.
6.3
6.3
97%
Cavan, Ireland
$38 USD per hour
Over the last few years . I have developed a wide range of Odoo, AWS, ROR and MySQL include sites for start up companies and business . I have also experience in OOP, MVC, C++ , And Software Design and testing . I have expert-level experience in the following technologies: Server-side • PHP • Swift 2 • Dotnet Client-side • HTML5, CSS, LESS • Twitter Bootstrap • Responsive Design • JavaScript, jQuery Data • MySQL, MSSQL • DynamoDB • SQL server Server-side Frameworks • CodeIgniter , Cakephp , Dotnetnuke ,Laravel Platform • Odoo • Magento • Laravel • Shopify • Joomla • Bigcommerce • Volusion Cart • Pinnacle Cart • WordPress • WooCommerce • Dotnet • Cakephp • IOS development • Android Development Tools / Other • Git, GitHub • SubVersion (SVN) Methodologies • Agile I want to achieve the peak position by providing high quality work and by learning new technologies . I used to write English articles as My Hobby . and have vast experience in English writing . I Am Cs graduate from the top university of Pakistan . And have experience of over 12years .
5.5
5.5
100%
Gorey, Ireland
$30 USD per hour
I have 10 years experience in web and application development with excellent knowledge of .Net, , HTML/CSS, Javascript, AngularJS, SQL, 3 years experience creating websites and programming modules in DNN/DotNetNuke.
4.9
4.9
100%
Woodford, Ireland
$40 USD per hour
Hallo, ich entwickle beruflich seit ca. 16 Jahren in C# .Net und habe sehr viel Erfahrung in den folgenden .Net Technologien: WinForms, WPF (MVVM), WCF, WF (Workflow Foundation), TPL, Async Await, Rx, EF (Entity Framework/Core), Asp.Net/Core (MVC and API) und .net core 2-7. --------------------------------------------------------------------------------------------------------------------------------------- Hi, I am a senior C#/.Net developer with about 16 years on the job experience. I am most experienced in the following .Net technologies: WinForms, WPF (MVVM), WCF, WF (Workflow Foundation), TPL, Async Await, Rx, EF (Entity Framework/Core), Asp.Net/Core (MVC and API) and .net core 2-7.
2.7
2.7
100%
Dublin, Ireland
$20 USD per hour
I am a software engineer who has participated in the architecture, design, development, and debugging of various projects. Agents bid for everything and try to find the freelancer once hired, I work on the project myself so I only bid for those I am confident with, and I value my reputation. I prefer smaller projects as I have a daytime job.
3.8
3.8
100%
Waterford, Ireland
$25 USD per hour
Webie is a full-service web design and development agency specialising in creative design, intelligent and affordable web solutions.
A SQL developer is a database specialist who designs, writes, and optimizes Structured Query Language code to store, retrieve, and manage data inside relational database systems. SQL developers build the queries, stored procedures, views, triggers, and schemas that power applications, reporting tools, and analytics pipelines across virtually every data-driven business.
Hiring a freelance SQL developer gives you direct access to the engineer who will turn raw business requirements into reliable, performant database code. The work goes far beyond writing SELECT statements. A skilled SQL developer designs normalized schemas, enforces referential integrity, tunes slow queries, and ensures that the data layer keeps pace with application growth.
Commercially, this matters because the database is usually the bottleneck. Slow queries cost conversions, broken reports cost decisions, and poorly designed schemas cost months of refactoring. A competent SQL expert prevents those costs and turns data into a strategic asset.
SQL development covers a broad set of tasks. Most freelance engagements include some combination of the following:
A strong SQL consultant is fluent across multiple relational engines and the surrounding ecosystem. Common platforms and tools include:
Almost every sector that handles structured data benefits from SQL expertise. Typical use cases include:
The strongest SQL specialists combine theoretical database knowledge with hands-on experience optimizing real workloads. When reviewing candidates, look for portfolios that include schema designs, before-and-after query tuning examples, and migration case studies. Vendor certifications such as Microsoft Certified: Azure Database Administrator Associate, Oracle Database SQL Certified Associate, or PostgreSQL Associate Certification are useful credibility signals, though practical experience usually carries more weight.
Ask candidates to walk through a query they optimized and explain the reasoning. The ability to read execution plans, identify index opportunities, and justify schema decisions separates senior database developers from junior ones.
Sample interview questions you can use directly:
Freelancer.com gives you access to a global pool of database engineers covering every major SQL dialect, cloud platform, and industry vertical. Whether you need a short engagement to fix a slow report or a long-term database architect to design a new data warehouse, you can post a project on Freelancer.com and receive competitive bids within hours.
Profiles on Freelancer.com include verified ratings, completion rates, portfolios, and client reviews, so you can shortlist confidently. Milestone Payments hold funds securely and only release them when you approve the work, giving both sides a clear, protected workflow. The scale and diversity of freelancers on Freelancer.com means you can match technical specialty, time zone, and budget to your exact project.
Hiring a SQL developer is straightforward when you describe the database environment and the outcome you need. The clearer your brief, the more accurate the bids will be. The process below walks through how to post your project, evaluate proposals, and award the work with confidence.
The project post is the single biggest determinant of bid quality. A precise brief filters for SQL developers whose dialect, tooling, and domain experience genuinely match your work. Head to the
Bids are short proposals that reveal how each SQL developer interprets the brief. Read them carefully. A strong proposal will reference your specific database engine, suggest a likely cause for performance issues you described, and outline a realistic plan rather than a generic pitch.
Final selection should combine proposal quality with profile evidence. For database work, look for consistency across multiple completed projects rather than a single impressive example. Pay close attention to written reviews that mention performance gains, on-time delivery, and clean documentation.
Simple work such as writing a set of stored procedures or tuning a handful of queries can be completed in a few days. Larger engagements like full schema redesigns, data migrations, or building a reporting back-end usually take several weeks. Timelines depend on data volume, the number of integrations, and how clean the existing database is.
A SQL developer focuses on writing and optimizing queries, stored procedures, and schemas that support applications and reporting. A database administrator focuses on the running database itself, including backups, replication, security, patching, and uptime. Many freelancers cover both, but for complex production environments you may want one of each.
Yes. Short, scoped engagements such as fixing a slow query, writing a specific stored procedure, or building a one-time data export are common on Freelancer.com. Provide the schema, sample data, and current execution plan in your brief so the freelancer can quote accurately.
Choose a SQL developer when the work centers on relational database design, query writing, and procedural logic inside engines like SQL Server, PostgreSQL, or Oracle. Choose a data engineer when the project requires building large-scale pipelines across distributed systems, streaming data, and tools like Spark or Kafka. Many freelancers carry both skill sets, so describe the workload clearly in your brief.
Generally no, at least not initially. Provide a sanitized copy, a staging environment, or an anonymized data sample so the freelancer can develop and test safely. Production access can be granted later under proper credentials and with version-controlled deployment scripts.
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