Graphic designers
Website designers
Mobile app developers
Software developers
3D artists
Illustration
Other popular skills
Working with international freelancers
Where to find the best developers
Do you need a local freelancer?
Building an international team
Featured jobs
Explore our current list of excited top featured projects.
Find contests
Unleash your talent and find freelancer contests to enter.
Website jobs
Graphic design jobs
Data entry jobs
Mobile app development jobs
Internet marketing jobs
Local jobs
Other popular jobs
Find work in different languages
Enterprise
Power your competitive advantage with Freelancer Enterprise.
Field Services
Deliver expertise anywhere in the world at scale - on demand.
AI for business
Let experts in the latest AI technology transform your business.
Freelancer products
Innovation Challenges
Turn challenges into breakthroughs with the largest innovation hub.
Freelancer API
Use the Freelancer API to access a cloud workforce of skilled freelancers.
Local jobs
Get help in any location, anywhere in the world.
Freelancer services
How it works
How to hire the perfect freelancer for your project
Get ideas
How to get started earning money freelancing
Resources
EXPLORE
4.1
4.1
91%
$50 USD / Hour
・
Brazil (8:37 PM)
・
Joined on March 22, 2007
$50 USD / Hour
・
- Expert Python/PHP/.NET professional, both web and desktop - Expert SQL developer, experienced in both complex queries and performance tuning - Experienced in both MongoDB and ElasticSearch - Focused on producing maintainable, clean, performant, and readable code
Verifications
On time
100%
On budget
100%
Accept rate
62%
Repeat hire rate
10%
Sample ORM in Python (partial code)
Sample ORM in Python (partial code)
Carlos S.
$20 USD
Excellent delivery and on time. Great documentation and communication.
Share
Chris R.
$250 USD
Leon did a great job delivering my project within the expected timeframe and helped me get it running on my PC
Share
User has not replied to several emails. The user is way busy. This is not a negative feedback. I needed to get my project done so I had to repost my project.
Share
Leon was a pleasure to work with. He went above and beyond to ensure my satisfaction. Highly recommended.
Share
I would definately recommend this service provider. He did more work than originally needed. He made sure that the job was done correctly. I am hiring him to do more work for me as I write this rating. If you need professional and quick work for a very competitive price, this is the provider for you! Highly Recommend!
Share
Experience
Systems Specialist
Apr, 2008 - Nov, 2011
•
3 years, 7 months
IBM
Apr, 2008 - Nov, 2011
•
3 years, 7 months
Responsible for a critical-mission application that participated on AT&T's worldwide billing system.
Apr, 2008 - Nov, 2011
•
3 years, 7 months
Education
Technologist in IT Management
2007 - 2010
•
3 years
Brazil
2007 - 2010
•
3 years
Qualifications
FCE - Cambridge English: First
1996
Cambridge University
Cambridge English: First, also known as First Certificate in English (FCE), is an upper-intermediate level qualification. It proves you can use everyday written and spoken English for work or study purposes.
1996
Publications
User-based authentication using Orbited + ActiveMQ
Quick instructions on how to configure per-user authentication for Orbited and Apache's ActiveMQ.
Certifications
Freelancer Orientation
G
General Orientation Exam
E
Employer Orientation Exam
Freelancer
About
Terms
Partners
Apps
