Oscar Cristaldo
@oscarcristaldo
Experienced software developer specializing in Elixir, full-stack and mobile solutions.
ParaguayWhat I'm looking for
I am an experienced software developer based in Paraguay with deep expertise in Elixir, full-stack web, and mobile development. I have built scalable, event-driven backends using Elixir (GenStage, GenServer, OTP) and Phoenix, and I complement backend work with frontend skills in React, Typescript, and GraphQL while also delivering native iOS features in Swift.
Across fintech and enterprise projects I led integrations, improved user experiences, automated reporting, and modernized systems using Java, Spring Boot, PostgreSQL, Docker, Kubernetes/OpenShift, and CI workflows. I actively contribute to the Elixir community, continue advancing my Elixir metaprogramming skills, and aim to join teams building reliable, high-performance distributed systems.
Experience
Work history, roles, and key accomplishments
LEElixir Developer
Learn-Elixir.dev
Nov 2022 - Present (2 years 11 months)
Continuously learning and contributing to Elixir metaprogramming, OTP, and concurrent systems while participating in community projects and knowledge sharing.
Software Developer
OneHQ
Nov 2021 - Present (3 years 11 months)
Specialized in transforming insurance customer data into OneHQ system formats and built scalable, event-driven backends using Elixir, Phoenix, GenStage and GenServer while supporting frontend features with React and TypeScript.
Software Developer
Netel S.A.
Jan 2019 - Dec 2021 (2 years 11 months)
Engineered Java EE and Oracle-based payment integrations with external APIs and automated BI report generation using iReport and JasperReports Server to expand transaction capabilities and reporting accuracy.
Software Developer
Cooperativa Universitaria Ltda.
Oct 2015 - Dec 2018 (3 years 2 months)
Optimized Spring Boot REST services, redesigned web banking interfaces yielding a 30% uplift in customer satisfaction, automated Python-based reporting, and maintained Java queuing and Oracle systems for compliance.
Help Desk Technician
Cooperativa Universitaria Ltda.
Jan 2013 - Aug 2015 (2 years 7 months)
Provided technical support to over 700 employees, authored internal procedures and training materials, and managed LAN/WAN troubleshooting and IT equipment maintenance.
Diplomatic Mailroom Clerk
Embassy of the United States
Nov 2012 - Dec 2012 (1 month)
Sorted diplomatic pouches following strict security protocols and improved English communication through regular customer interaction.
Driver and Cleaner
Sun Valley Resort
Dec 2011 - Apr 2012 (4 months)
Transported supplies and maintained resort cleanliness while improving English through practical workplace interactions.
Cooks Helper
Deer Valley Resort
Dec 2010 - Apr 2011 (4 months)
Prepared salads and managed ingredient setup in a supervised kitchen environment, enhancing teamwork and English language skills.
Education
Degrees, certifications, and relevant coursework
Universidad Nacional de Asunción
Bachelor of Science, Computer Science
Completed a computer science degree focusing on software development and systems engineering.
Colegio Parroquial San Cristóbal
High School Diploma, High School
Completed secondary education with graduation in 2006.
Tech stack
Software and tools used professionally
Availability
Location
ParaguayAuthorized to work in
Job categories
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