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Welcome to Samuel's freelance profile!

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Samuel Rizzo

Senior Full Stack Java and Ruby Developer

Can work in or around Berlin, Stuttgart, Hamburg, Frankfurt am Main, München, Leipzig, Dresden

  • 52.517
  • 13.3889
  • Suggested rate £585 / day
  • Experience 7+ years
  • Response rate 100%
  • Response time A few days
Propose a project The project will begin once you accept Samuel's quote.

This freelancer is available part-time (Evenings & weekends) but hasn't confirmed their availability in over 7 days.

Part-time, Evenings & weekends

Propose a project The project will begin once you accept Samuel's quote.

Location and workplace preferences

Berlin, Germany
Can work onsite in your office in
  • around Berlin and 50km
  • Around Stuttgart and 100km
  • Around Hamburg and 100km
  • Around Frankfurt am Main and 100km
  • Around München and 100km
  • Around Leipzig and 100km
  • Around Dresden and 100km


Freelancer code of conduct signed
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Verified email



Github : srizzo srizzo
  • 45 Repos
  • 3 Gists

Stack Overflow

Stack Overflow : Samuel Rizzo Samuel Rizzo
  • 2611 Reputation
  • 18 Bronze
  • 18 Silver
  • 2 Gold


  • English


  • Portuguese

    Native or bilingual


Skills (16)

  • Languages
  • Beginner Intermediate Advanced
  • Beginner Intermediate Advanced
  • Beginner Intermediate Advanced
  • Methodologies
  • Beginner Intermediate Advanced

Samuel in a few words

I'm a freelancer specialized in Java, React, Ruby on Rails, and AWS. I have over 13 years of combined experience as a Full-stack Developer, Software Architect, and Tech Lead, accumulated across well-established companies as well as early-stage startups.


Freiberuflicher Softwareentwickler

Java developer  - As a freelancer

Berlin, Germany

December 2020 - December 2020

Java development


Senior Full-stack Ruby on Rails Developer  - As a freelancer

February 2020 - March 2020

Development of a quick yet fully functional prototype to help validate an idea and choice of technologies.

Freelancer - Multiple clients

Digital & IT

Senior Full Stack Developer  - As a freelancer

Berlin, Deutschland

June 2017 - Today (5 years and 6 months)

Independent consultant for multiple clients and projects:
● Helped a fast-growing German used-car portal build and launch an important and strategic product. Skills: Kotlin, Java, Microservices, Spring Boot, AWS, Kinesis, Kubernetes, Docker, Terraform
● Helped an online marketplace adopt Elasticsearch and increase 33x performance. Skills: Elasticsearch
● Helped two German potential co-founders with the development of a fully functional prototype. Skills: Ruby on Rails, ActiveAdmin, MySQL
● Interim tech lead for a German online catering platform. Skills: Ruby on Rails, Vue.js, AWS, Cloud66, Semaphore CI, PostgreSQL, Scrum
● Multiple projects for XING. Skills: Ruby on Rails, React, Redux, REST APIs, RabbitMQ, MySQL, Jenkins, Docker, Kubernetes


Social Networks

Senior Software Engineer, Ruby on Rails

Hamburg, Deutschland

September 2015 - May 2017 (1 year and 8 months)

Permanent position at the massive German career-oriented social network.
  • Developed scalable and highly available software that served 12+ million users, hundreds of requests per second.
  • High performing, Continuous Delivery/Agile/Scrum environment
  • Mentored, interviewed, and onboarded multiple working students, new employees, and freelancers.
Ruby on Rails Ruby RSpec Capybara REST MySQL Jenkins Scrum

Glass, Lewis & Co.

Consulting & Audits

Software Engineer, Ruby on Rails

Limerick, Irland

August 2014 - July 2015 (11 months)

Joined Meetyl, a startup that connected companies and investors.
● Shipped high-quality software in a fast-paced environment
● Rewrote the Elasticsearch-based company/investor search and matching engine with improved performance and maintainability
● Introduced a Hadoop/Hive-based solution that enabled ingestion and analysis of millions of records of financial data
Skills: Ruby on Rails, Elasticsearch, AngularJS, Hadoop, Hive

Capgemini - Capgemini Organisation

Software Publishing

Senior Software Architect, Java EE

Rio de Janeiro, Brasilien

October 2012 - June 2014 (1 year and 8 months)

Worked for Capgemini as a consultant at the Brazilian National Agency of Petroleum, Natural Gas and Biofuels.
● Was part of the software architecture team, overseeing multiple projects and teams
● Developed and maintained enterprise-wide shared components
● Provided architectural guidelines and assessed code quality and adherence to it
Skills: Java, Java EE 6, JPA 2, EJB 3.1, CDI, Jenkins, Sonar, Weld, JBoss Seam 3, JSF 2.1, PrimeFaces 4, JBoss EAP 6.1, Oracle, SOAP and RESTful Web Services (JAX-WS and JAX-RS, JAXB), Maven, UML

Spassu Tecnologia e Servicos

Software Publishing

Tech Lead, Senior Software Architect, Java EE

Rio de Janeiro, Brasilien

August 2011 - April 2012 (7 months)

Permanent employment at Spassu’s software house.
● Tech lead of 3 small teams
● Full stack development
● Software architecture of multiple projects
Skills: Java, JBoss Seam 2, RichFaces 3, JBoss AS 5, MS Sql Server, Oracle, UML
Java SQL Server Oracle Software Architecture


Software Publishing

Senior Software Architect, Java EE

Rio de Janeiro, Brasilien

December 2010 - August 2011 (8 months)

Worked for CTIS as a consultant at the Brazilian National Agency for Cinema.
● Maintained a custom Java framework and components, shared by all projects
● Provided technical support and architectural guidelines to an external software provider
Skills: Java, Jenkins, JBoss Seam 2, RichFaces, JPA 1, Oracle, JBoss AS 5, UML
Java Jenkins Software Architecture Oracle

2 projects on Malt

(1 rating)

Susanne - Adressmeisterei


Sehr gute Zusammenarbeit, Samuel hat sehr zuverlässig und termintreu gearbeitet und sehr viel Know-how, gerne wieder