Samuel Rizzo

Senior Full Stack Java Developer

Berlin, Germany

  • 52.517
  • 13.3889
  • Indicative rate €680 / day
  • Experience 7+ years
  • Response rate 100%
  • Response time A few days
Propose a project

Availability not confirmed

Part time, Evenings & week-ends


Work location
Can do a full mission at the client office
Mission location
  • Berlin
  • Hamburg




Github : srizzo srizzo
  • 28 Repos
  • 3 Gists

Stack Overflow

Stack Overflow : Samuel Rizzo Samuel Rizzo
  • 1791 Reputation
  • 16 Bronze
  • 14 Silver
  • 2 Gold

Skills (13)

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.


February 2020 - March 2020


Senior Full-stack Ruby on Rails Developer

Development of a quick yet fully functional prototype to help validate an idea and choice of technologies.
May 2017 - Today | Berlin, Deutschland

Digital Agency and IT company


Freelancer | Senior Full Stack Developer

As a contractor/consultant, I support startups and big corporations with:

  • Full Stack Development with Java / Ruby on Rails / React / Vue.js
  • Architecture and design of technical solutions
  • Prioritization and delivery of critical projects/features on tight deadlines
  • Migration/refactoring of legacy code
  • Automation of DevOps and CI/CD
  • Adoption of cloud infrastructure and services (AWS/Google Cloud).
September 2015 - May 2017 | Hamburg, Deutschland

Social Networks


Senior Software Engineer, Ruby on Rails

In the SEO team, designed and implemented a replacement solution for our Members Directory's engine that provided a remarkably simpler yet more solid and maintainable foundation, and served as a blueprint for the development of new directories. Advocated a Continuous Delivery culture, introduced and implemented integration tests (Capybara) and helped to implement a CI/CD pipeline (Jenkins).

In the Premium & Upsell Services team, helped maintain the platform that enables Xing to sell subscriptions to users and provides some of the Premium features, serving more than 12 million members, hundreds of requests per second. Helped with the migration of features from our legacy Perl monolith codebase to our Ruby on Rails microservices platform (REST and AMQP APIs). Mentored and onboarded multiple working students, new employees, and freelancers.

Tech Stack: Ruby on Rails, RSpec, Capybara, REST APIs, AMQP APIs, MySQL, Jenkins
August 2014 - July 2015 | Limerick, Irland

Consulting & Auditing

Glass, Lewis & Co.

Software Engineer, Ruby on Rails

In the team.

Designed and implemented a solution that enabled continuous ingestion and analysis of millions of records of financial data from FactSet, introducing big data and ETL tools (Hadoop, Hive and Sqoop), and building an AWS EMR pipeline.

Rewrote our company/investor search and matching engines (Elasticsearch) with remarkable improvements in performance and maintainability.

Tech Stack: Ruby on Rails 3 / 4, DataMapper, Elasticsearch, AngularJS, Resque, RSpec, Capybara, Hadoop, Hive, Amazon EMR
October 2012 - June 2014 | Rio de Janeiro, Brasilien

Software Publisher

Capgemini- Capgemini Organisation

Senior Software Architect, Java EE

Worked at ANP, Brazilians’s National Agency of Petroleum, Natural Gas
and Biofuels, in the architecture team. We were responsible for the definition and enforcement of architectural standards and guidelines to be followed by internal and external development teams, and for coaching and supporting our internal teams. Tech Stack: Jenkins, Sonar, Java EE 6, CDI, Weld, JBoss Seam 3, JSF 2.1, PrimeFaces 4, JPA 2, EJB 3.1, JUnit, JBoss EAP 6.1, Oracle, SOAP and RESTful Web Services (JAX-WS and JAX-RS, JAXB), Maven
August 2011 - April 2012 | Rio de Janeiro, Brasilien

Software Publisher

Spassu Tecnologia e Servicos

Tech Lead, Senior Software Architect, Java EE

Worked at Spassu’s Software Development Center. I was responsible for the architecture and design of our projects, and for providing technical leadership and coaching to 3 small development teams. Tech Stack: JBoss Seam 2, JBoss Seam Application Framework, RichFaces 3, JBoss AS 5, MS Sql Server, Oracle
December 2010 - August 2011 | Rio de Janeiro, Brasilien

Software Publisher


Senior Software Architect, Java EE

Worked at Ancine, Brazilian’s National Agency for Cinema. I was responsible for the definition and enforcement of architectural standards and guidelines, and for quality assessment of code received from external development agencies. Tech Stack: Java EE, Jenkins, JBoss Seam 2, RichFaces, JPA 1, Oracle, JBoss AS 5

1 Malt mission

Client satisfaction on Malt : 5.0/5 (1 rating)

Susanne - Adressmeisterei


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



  • Englisch

    Full professional proficiency

  • Portugiesisch

    Native or bilingual

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