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Oscar Cristaldo

@oscarcristaldo

Experienced software developer specializing in Elixir, full-stack and mobile solutions.

Paraguay
Message

What I'm looking for

I seek challenging backend/full-stack roles using Elixir and distributed systems, collaborative teams, opportunity to contribute to open-source, and technical growth in scalable architectures.

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

Learn-Elixir.dev logoLE
Current

Elixir 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.

PE

Software Developer

Pago Express

Jan 2021 - Oct 2021 (9 months)

Enhanced the Wally iOS app with Swift and Firebase and advanced Wally Empresas full-stack capabilities using Java and Angular to improve UX and system reliability.

CL

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.

CL

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.

Education

Degrees, certifications, and relevant coursework

UA

Universidad Nacional de Asunción

Bachelor of Science, Computer Science

Completed a computer science degree focusing on software development and systems engineering.

CC

Colegio Parroquial San Cristóbal

High School Diploma, High School

Completed secondary education with graduation in 2006.

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Oscar Cristaldo - Elixir Developer - Learn-Elixir.dev | Himalayas