Hire a Freelance SQL DeveloperFind top freelance SQL developers quickly and easily on Codementor. Work with our vetted developers who have the proven skills and experience to get the job done. Get help with projects by-the-hour or long-term. Hire a trusted SQL freelancer on Codementor today.
Working in the IT sector for more than 10 years. With over 10 -years of freelancing and professional experience taught me all kinds of frameworks and languages, ranging from React, Angular, Vue, Node js, Express js, React Native, Redux, Rx JS, JavaScript, Typescript, WordPress, PHP, MySQL, MongoDB, Firebase, Sqlite, Postgresql, ES5+, Python3, Machine Learning, Deep Learning, RNN, CNN, Android Java/Kotlin, iOS Swift/SwiftUI, C/C#/C++, .Net, Assembly, VBA, VB, Excel Macro, Java, Spring Boot Micro-services, R, Shiny, STATA, MATLAB, Google Sheet, App Script, Bubble io, etc. Over my long career, I have come across all kinds of challenges and gained vast experience with different kinds of industries like portals, medical industry, perception exercise, employee management, etc. I have good experience with frontend development using React JS along with Typescript, Firebase, GraphQL, React Native, Native Script, React, Material UI, Ionic, Node.js, Web Sockets, and real-time communication. I have also worked on containerization technologies like Kubernetes, Docker, AWS, GCP, Azure etc. I am very good with backend technologies as well like Java Spring boot, Microservices, MySQL, Postgres, Elasticsearch, AWS/Google integration. Please contact me to get the result done in a professional way.
With over five years of experience in health logistics management systems, HealthTech, and EdTech, I specialize in developing cloud-based applications. I've participated and led key roles in large projects, optimizing processes, server management, and system performance for efficiency. Aside being experienced as a hands-on engineer, I have had the priviledge of teaching and mentoring a few tech enthusiasts helping them develop their enthusiasm into full technical proficiency and professional growth. It has been rewarding to see their passion evolve into tangible skills and career achievements, and witnessing their development has reinforced my own understanding and appreciation of the field. Through this mentorship, I've gained insights into different learning styles and challenges, which has further enriched my own engineering practice and approach to problem-solving.
Engineer with a strong sense of appealing user interfaces, efficient software design, and outstanding online platforms. I use my stack to create scalable and high-performing web solutions. I am a full-stack software engineer who is passionate about creating amazing products and collaborating with other exceptional engineers to find quick fixes for issues.
A full-stack software engineer passionate about crafting scalable, high-performing web solutions. With a strong focus on appealing user interfaces, efficient software design, and outstanding online platforms, I leverage my tech stack to build exceptional products. I thrive on collaborating with other talented engineers to deliver quick and effective solutions.
I am a software engineering with 10+ years of enterprise experience in software development, leadership and coaching. My favorite development area is Mobile Development I am also able to help any person begin a new career or reach the next level in software engineering :)
With years of experience in finance, web3, and education, i specialize in developing cloud-based applications. I've led key roles in large projects, optimizing processes, server managements, and system performance for efficiency. My dynamic problem-solving approach drives creative solutions, always staying updated with the latest technical breakthroughs to enhance my skills.
Hello, I am Emmanuel and I have over 5 years of hands-on experience in software development, data analysis, and machine learning, I'm excited to bring my expertise to the role of a mentor. My passion for guiding and nurturing the next generation of developers fuels my desire to share experiences, insights, and best practices. I believe in the transformative power of mentorship and am committed to making a positive impact on the lives and careers of aspiring individuals. Through dedication, integrity, and a nurturing approach, I aim to provide guidance, support, and encouragement in an environment where mentees can thrive and grow. I'm eager to contribute to the program and embark on this fulfilling journey of mentorship, inspiring and empowering others to reach their full potential.
Seasoned Web Developer and Blockchain enthusiast with a proven track record in the IT and services industry. Expertise in Research, PHP, HTML, JavaScript, and Blockchain development, including Smart Contracts. Skilled in automation, application testing, and cybersecurity analysis for web and mobile apps.
I am a **Multi-talented** professional adept in **Full Stack Web Development**, **Web Security Research**, and **Robotics Engineering**. As a dedicated Web Security Researcher and ethical hacker, I uncover vulnerabilities and mitigate security risks, bridging the gap between development and cybersecurity. Additionally, as a Robotics Engineer, I design and build sophisticated robotic systems, applying my deep understanding of mechanics, electronics, and programming. Passionate about crafting clean, scalable code and innovative robotics solutions, I contribute to projects that prioritize both robust development, cybersecurity practices, and cutting-edge robotic technology.
I'm an experienced React Native developer with five years in the field, specializing in creating cross-platform mobile applications. Alongside my frontend expertise, I have strong experience as a backend engineer and MERN stack developer, allowing me to work across the full stack. I also bring DevOps experience, including Kubernetes orchestration and deployments on platforms like AWS, Digital Ocean, Google cloud and Azure. My journey has involved collaborating on diverse projects, staying updated on industry trends, and contributing to both frontend and backend development. Looking forward, I aspire to contribute to innovative projects, leveraging my full-stack and DevOps expertise to create seamless, scalable, and user-centric solutions.
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Structured Query Language – or SQL – is one of the most popular database languages in the world. It’s used to manipulate and, as the name suggests, query data found in relational databases. As data processing is becoming an essential process for almost every industry on the planet, SQL developers remain in high demand.
Companies have more ways to utilize data than ever, making SQL vital for non-technical and technical professionals alike. Via SQL databases, organizations can structure data in ways that help them learn more about their customers’ preferences, behaviors, and tastes across various platforms.
Furthermore, SQL is crucial for back-end development – it’s used to manage the databases on which most applications and servers are based. For brand-new developers, SQL is also handy because it’s effortless to learn – its syntax is almost as understandable as any human language.
Basically, any company with a website that functions by retrieving any kind of data from a back-end database probably uses SQL. Of course, many of those databases are proprietary and come with certain system-specific features and quirks. However, most of them still use SQL whenever they need storage for relational data.
That includes everyone from Facebook to music streaming services like Spotify, social media platforms like Instagram and Twitter, and even banking apps. Logging, e-commerce, and data warehousing – if we’re talking about any process that involves data on web servers, it probably uses SQL.
In practice, most companies won’t develop their own proprietary database management systems – there are already plenty of open-source options based on SQL, such as MySQL, Ingres, PostgreSQL, Firebird, etc.
The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance SQL project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance SQL request on Codementor, check out our article.
We don’t charge anything when you post a freelance hiring request for SQL developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.
While the exact skills your ideal SQL coders need vary from project to project, there are some things that every decent SQL programmer should know. For instance, they need some basic knowledge of relational theory, as well as SQL design skills and performance tuning. The same applies to SQL refactoring skills, knowledge of NoSQL, and XSLT experience.
Relational theory and SQL design skills are vital for new projects that are just getting off the ground – if a database was mismanaged and poorly designed early on, migrating them will be problematic down the line. Once you’ve established a system, design skills become less important – though they’re still helpful.
Also, SQL refactoring knowledge is excellent for larger teams, where the SQL work can become quite complex. While Java refactoring is simpler nowadays, mainly because of IDE tooling, SQL code is still relatively difficult to test.
We do a comprehensive technical and communications screen of all SQL developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing SQL developers’ user satisfaction rates.
If you’re hiring freelance SQL developers for your project, there are a couple of things you want to check during your interview. On the one hand, you want to see whether they have the technical expertise you need, and on the other, you need to learn whether they’re dedicated freelancers ready to commit to your project.
Here are a few interview questions you can use to that effect:
For more answers to frequently asked questions, see here.