John Hamelink, top Postgis developerHire Now
John Hamelink4.9
Freelance Postgis developer in Glasgow, United Kingdom

CTO: Elixir, Ruby, Rails, Android Developer (and scrum master) with 10+ years experience

I've now completed over 130 sessions on Codementor! I'm a consultant developer who's been coding for over 10 years now; 6 of those years professionally. I mainly work in Rails, EmberJS and Elixir these days, but I've built things in languages ranging from C to NodeJS to Go. I've had the opportunity to have large multi-nationals on my client list such as Mozilla, IBM,, and multiple large financial businesses. Outside of Codementor, I'm a CTO at a Startup in Scotland, as well as a consultant adviser for various startups and small businesses in Scotland and the UK.
Marco Afonso, Postgis freelance coderHire Now
Marco Afonso
Freelance Postgis developer in Tavira, Portugal

Web dev fanatic with more that 10 years of experience

Postgis is the best option for geospatial data storage and management
Raditha Dissanayake, Postgis consultant and programmerHire Now
Raditha Dissanayake5.0
Freelance Postgis developer in Nugegoda, Sri Lanka

Polyglot, Software architect, RDBMS expert.

Done a heck of a lot of programming and software design since I wrote my first on a Sinclair ZX spectrum in 1987. Not enough of it has been made open source.
Ariadni-Karolina Alexiou, Postgis engineer and developerHire Now
Ariadni-Karolina Alexiou4.9
Freelance Postgis developer in Frankfurt am Main, Germany

Python expert for Data Applications & Web Dev

I'm a Python and Java/Scala developer, with main focus on Big Data solutions and some full stack web dev experience. I will happily look at your code or system and point out bugs or suggest a better way to do something. Have experience with most popular Python libraries including pandas, matplotlib and numpy. If you want a great code review/refactoring of your Python code, from which you are going to learn and improve as a developer, I am the person to go to. If you have a data transformation that is taking ages, ask me for my help. I have been able to achieve speedups of up to 500x for people here, by using libraries such as pandas in an optimized way and being aware of memory usage patterns. I also am particularly well versed in geospatial data management and the open source proje...
Andy Maleh, Postgis freelance developerHire Now
Andy Maleh5.0
Freelance Postgis developer in Chicago, United States

Software Development, Architecture and Team Management Consultant

Writing code since 1987 and developing professional software since 2003. Master Software Engineer (DePaul University, Chicago, USA) with a Bachelor of Science in Computer Science (McGill University, Montreal, Canada). Master Software Craftsman. Engineered deal personalization and subscription features for (serving 33MM+ users). Architected Primary languages/skills: Ruby, Rails, JavaScript, Java SE/EE, Spring, TDD, Software Engineering, Software Architecture, Engineering Management, Agile Project Management, and Web/Desktop Development. Hobbies when not coding include drumming, snowboarding, and longboard riding. I like to help honest self-motivated individuals. Please include what you've attempted in your help request to demonstrate effort. Messages sent witho...
Mischa, Postgis programmer for hireHire Now
Freelance Postgis developer in Wrocław, Poland

Jack of all trades, master of some

I've been writing code or reading about software nearly every day for about 20 years. I've been working full-time as a professional software engineer for 12. Software and hardware are super interesting and fun for me, but what I really enjoy is helping other people to learn. I've put together a wiki with some articles and lots of links and resources for people who want to learn to code, learn more about particular topics or up their game: Not only do I have knowledge and experience in specific areas such as databases, web applications, security, networking, Linux, C, and plenty more, I also have real-world experience building commercial products and explaining complex technical concepts in straightforward English to non-technical...
Rick van Hattem, Postgis software engineerHire Now
Rick van Hattem5.0
Freelance Postgis developer in Rotterdam, Netherlands

Very experienced Python and Postgresql architect with a vast experience in scaling and helping others

Author of Mastering Python (, a book to teach advanced Python programmers everything they need to master the language. No cure, no pay for specific problems. I only accept issues if I'm confident I can fix them in a short amount of time. Always happy to give advice :) Over the last 15 years I've started several companies and according to Stackoverflow I've helped ~3.2 million people using my knowledge. I'm one of the top Python contributors on Stackoverflow and have over 30k points. My main interests are scaling of large infrastructures and websites to millions of users as I did with my last large startup ( I have many years of experience consulting people and companies with varying programming, dba...
Hitesh Garg, Postgis freelance programmerHire Now
Hitesh Garg5.0
Freelance Postgis developer in Noida, India

Google Summer of Code 2017 Participant with Open States || Python Developer

Google Summer of Code 2017 Participant with Open States . Working Experience with Django, Flask, Amazon Web Services, Heroku, Bluemix, SQL & NoSQL Databases. Open Source Developer at Open States. Portfolio ::
Adam Michel, Postgis freelance programmerHire Now
Adam Michel
Freelance Postgis developer in Portland, United States

Software Engineer and Techstars Alumni

I am a self-taught software engineer with the patience to listen and the experience of knowing what works at scale. Through my Startup Weekend experience and time spent freelancing in co-working spaces, I know how to scope and build an MVP. Through my Techstars experience, I know how to ask lots of questions about everything from financial models to implementation details. Through my experience at Quirky and Digital Ocean, I know what breaks when you have millions of users and billions of records and how to solve those challenges quickly. Looking for a mentor? I remember what it was like starting out and remember the kind of mentorship that helped get me where I am today. If your rubber ducky and linter have both failed you, let's talk. Looking for a freelancer? Let's talk about your pro...
Christopher Cardinal, Postgis programmer and consultantHire Now
Christopher Cardinal5.0
Freelance Postgis developer in Nederland, United States

Data and Geographical Information Systems Analyst

Over a decade of experience in working for various data sets (esp. spatial). Very strong skills in R, Python, ArcGIS, QGIS, Leaflet, D3, etc. I can make publication-quality maps, or online interactive maps and story maps. Whatever your needs, I known we can find a great solution.
Andrew Tian, Postgis freelance programmerHire Now
Andrew Tian5.0
Freelance Postgis developer in Los Angeles, United States

Security Researcher

web developer with 8+ years of experience. worked with high-traffic sites.
Koen Schmeets, top Postgis developerHire Now
Koen Schmeets5.0
Freelance Postgis developer in Tbilisi, Georgia

Software writer by day, mad scientist by night

Steve Purcell, top Postgis developerHire Now
Steve Purcell5.0
Freelance Postgis developer in Auckland, New Zealand

Web Startup Tech Lead - Full Stack Help - Tips & Tricks to Share!

Hi! I'm a polyglot technologist with decades of experience in startups and industry, and one of the most active Github users worldwide. Want insights, guidance or help? Get in touch!
Tim Sheerman-Chase, Postgis software engineer and devHire Now
Tim Sheerman-Chase
Freelance Postgis developer in Portsmouth, United Kingdom

C++/Python developer specializing in Computer Vision/Machine Learning

I am a software engineer, with experience in range of industries, technologies and academia. My main programming languages are Python and C++ but I also am experienced in C, PHP, HTML, SQL, etc. My PhD has given me a solid background in image processing and machine learning. I have teaching experience in both university labs and scuba diving instruction.
Derek Kastner, top Postgis developerHire Now
Derek Kastner
Freelance Postgis developer in Houston, United States

Full stack developer

Where there is software to be written, Derek will be there to write tests and code. Specialties: Primarily the Ruby and Rails ecosystems, but I have experience with many different platforms and languages.

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