Hire the Best Freelance SQL DevelopersHire a Freelance SQL Developer

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Freelance SQL Developer - Adrian Segui
Freelance SQL Developer5.0 (84 reviews)
React JS | React Native | Node | Python | Java | Full-Stack Expert

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, 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.

Freelance SQL Developer - Shashank Polasa
Freelance SQL Developer5.0 (70 reviews)
Fullstack Software Developer

Software Developer & Architect driven to build high quality products. Skilled in multiple languages & frameworks C#.NET, Python, Javascript, Full Stack Web, AI/Deep Learning Microsoft Certified Professional

Freelance SQL Developer - Humayun Shabbir
Freelance SQL Developer5.0 (2495 reviews)
Expert Visual Basic, C# and JavaScript Developer | 3500+ sessions

Welcome to my profile on Codementor! I'm a dedicated full-time mentor with a track record of over 3500 sessions since 2015. My journey in programming has been marked by a deep engagement with P5.js, among other technologies. My career as a software developer spans over two decades, with a strong focus on Rapid Application Development (RAD). This approach has been a cornerstone of my work, allowing me to efficiently tackle complex and large-scale projects. As an expert in Visual Basic, I bring a wealth of experience, complemented by my proficiency in C#, JavaScript, VBA, and SQL. I'm passionate about problem-solving and navigating intricate code bases. Whether you're dealing with challenges in Visual Basic, C#, JavaScript, or any of the other languages I specialize in, I'm here to help you find effective and streamlined solutions. Let's work together to achieve your programming goals! I love working with: ⭐ Visual Basic ⭐ C# ⭐ JavaScript ⭐ VBA ⭐ SQL ✅ Recognitions: ------------------------- 🔹 Codementor of The Year 2018 🏆 https://twitter.com/CodementorIO/status/1076225048837586944 💎 Achievements: -------------------------- 🔹 3000+ Sessions 🔹 3 Arc/CodementorX projects

Freelance SQL Developer - Funbi Yusuf
Freelance SQL Developer5.0 (408 reviews)
Full Stack Software Developer | Software Engineer

Hire me to fix your code-related Bugs/Blockers, Hire me to bring life into your project. I have five (5) years experience in web development, Debugging and troubleshooting, I also have a well developed analytical and problem solving skills and an excellent knowledge of the MERN stack. scroll down to see great reviews from previous clients HTML | CSS | JAVASCRIPT | AJAX | JSON | API | NODE.JS | REACT.JS | REACT-NATIVE |MONGODB | JQUERY | EXPRESS | BOOTSTRAP | FIREBASE | GIT | MYSQL | SQL |REACT-CONTEXT |REACT-REDUX | HEROKU | PHP | WORDPRESS| GRAPHQL/APOLLO | NEXT.JS | PYTHON | SQLITE | FLASK |DJANGO

Freelance SQL Developer - Calvin Tham
Freelance SQL Developer5.0 (339 reviews)
Construct 3 and Python/Java Tutor (5+ years game dev exp)

- 5+ projects in freelancing mobile+website games in Construct 3 for clients - 1 year of daily tutoring in Construct 3 - 2 years of dev experience with Construct 2 - 1 year experience in tutoring game dev/design with Construct 2 - 3 years of school learning experience with Java - published one commercial Construct 2 game on Wii U - tutored Intro to Computer Science material using Python with Minecraft every week since Dec 2019

Freelance SQL Developer - Asaduzzaman Pavel
Freelance SQL Developer5.0 (64 reviews)
Senior Full-Stack / Software Engineer

With over a decade of experience as a full-stack/software engineer, I am proficient in developing websites and applications using Golang, Nodejs, PHP, and modern front-end JavaScript and TypeScript frameworks. [https://Iampavel.dev](https://iampavel.dev/)

Freelance SQL Developer - Karishma Mittal
Freelance SQL Developer5.0 (211 reviews)
Solution Architect | 12 years’ experience - Java, Python, DSA & DBMS

Senior Designer with 12 years’ experience - Java | Python | Data Structures | Spring Boot | Micro Services | Docker | Cloud Computing ● Total experience of 12 years as Senior Back-end Designer in Development and Maintenance environments. ● Excellent skills in developing and debugging Java applications. ● Experience in Application Level Software development for various domains like Telecom, Investment Banking and Android mobile apps. ● Great problem solving, communication and presentation skills. Enjoy working in team as well as independently.

Freelance SQL Developer - Tanisha Bhayani
Freelance SQL Developer5.0 (265 reviews)
AI Researcher and Developer

6 years of experience in building and managing AI Systems. * I develop end-to-end AI systems from requirements analysis, and data gathering to deployment, implementing new methods/research papers, and turning projects into research outcomes. I have achieved substantial performance in DL/ML/RL models for CV and NLP domain problems. * Implementing and deploying projects handling and maintaining scalability, research papers as well as POCs. * Project planning, requirements gathering, and analysing requirements to define the system's architecture, and implementation timeline. * Provide mentoring to junior developers for ML projects. Website: [roshantanisha.github.io/?ref=codementor](http://roshantanisha.github.io/?ref=codementor) Summary: I like to work on technology that is smart, simple and sophisticated. This sums up the vast knowledge required to work on projects to excel in a working product. I like to train Deep Neural Networks and understand them well. I have mentored many students for their AI careers, teaching them Machine Learning and Mathematics. I am a mentor for the RFS (Reach for the Stars) Programme by the Aga Khan Education Board for India. I am an alumnus of this program as well. I have a cumulative experience of 6 years working in the product and service-based industry for creating Machine Learning projects. I have done some innovative work that I am proud of and am continuing to do so. I try my best to contribute my expertise to the project I am working on. Highly Experienced in Machine Learning, Deep Learning, Advanced Deep Learning, Artificial Intelligence, and Algorithms, including models in the production environment, and deploying ML models. Working with top Indian colleges like BITS, niche NLP and CV, real-estate startups, MNCs, and Fortune top 20 companies, working with sensitive anonymized datasets, and creating state-of-the-art models are some of my achievements. I have strong and correct knowledge of Deep Learning concepts from the above experiences.

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Frequently asked questions

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:

  • Explain DBMS.
  • What is the difference between DBMS and RDBMS?
  • What are foreign keys?
  • What are UNIQUE constraints?
  • Name the different join clauses in SQL.
  • What does maintaining data integrity involve?
  • How long have you been working freelance?
  • How much time can you devote to our project?

As a platform, we strive to ensure you’re always happy with your SQL project’s results. If you’re unsatisfied with the results, you can choose to get a refund for the project. Additionally, you can contact our support team should you need any further assistance with your project.

For more answers to frequently asked questions, see here.

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