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Clelio De Souza (Leo)

Clelio De Souza (Leo)

Lead Software Engineer at AMT-SYBEX part of Capita

London, England

I am an experienced Java/Scala/Kotlin Software Engineer (18+ years) with hands-on development, design, analysis and deployment on several IT projects worldwide and different industries. I am a computing/programming technology enthusiast (Scala, Kotlin, JVM-based languages, Akka, The Reactive Manifesto ( - Rx, Groovy, Go), certified Oracle Java/SE/JEE/Web (SCJP 5.0 and SCWCD 5.0) and Scala + Akka professional (Lightbend Academy certification) with strong academic background on Computer Science (MSc and BSc with honour - first class).

My main skills are related to Java/Scala technologies (mostly back-end and quite good front-end as well), both considering Web and distributed environments (JEE), and also desktop-standalone (JSE) development: Java SE/EE, Scala, ScalaTest, Play Framework, Slick FRM, Akka Actors and Akka HTTP, Akka Streams, Akka Cluster, Http Dispatch, Multi-Threading APIs, strong OO concepts, design, JS/Ext/GWT, JSP, Taglibs, JAX-RS (Apache CXF), Apache Camel, Spring 2.5 and 3.0 (IoC, Batch, Web MVC, AOP, Integration JMS, Security, Social, Mobile and so on), Swing, SWT and Eclipse RCP, JFace, JDBC, EJB 2.x and 3.x, Websphere, Apache, Tc Sever, Hibernate, DWR AJAX, XML, Scrum, Agile, TDD with JUnit, EasyMock, PowerMock, Mockito, REST-assured, BDD (BDDMockito, Cucumber), OSGi, Karaf, Oracle, SQL, PL/SQL, MongoDB, Web Services, REST, Amazon AWS Cloud (EC2, EMR, Lambdas, Kinesis Streams, API Gateway, S3, RDS, SQS, SNS), Microsoft Azure Cloud Computing Services and others.


  • Lead Software Engineer (Capita)
  • Sr Java/Scala Developer (Contractor) (Aimia Inc)
  • Sr Java/Scala Software Engineer (Contractor) (HSBC)
  • Full-stack Java/Angular Software Engineer / Team Lead (Contractor) (Aimia Inc)
  • Sr Scala Developer (Contractor) (IMG Media)


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