sergiogarcia

Senior Backend Engineer

 

Blockchain Full Stack Engineer with 5 years of software engineering experience, specializing in backend development, distributed systems, and smart contract development. Experienced in Java, Spring Boot, event-driven microservices, and cloud infrastructure, with hands-on blockchain experience using Solidity, Foundry, OpenZeppelin, Chainlink, and IPFS.

Currently building blockchain projects involving ERC20 and ERC721 tokens, smart contract testing, and multi-chain deployments. Strong background in DDD, hexagonal architecture, automated testing, and CI/CD, with experience across telecommunications, banking, and tokenization.

Looking for a remote Blockchain Backend or Full Stack Engineer role where I can combine my backend engineering expertise with my passion for Web3, contribute to meaningful blockchain projects, and continue growing as a smart contract and blockchain developer.


Experience: 5 years

Yearly salary: $160,000

Hourly rate: $90

Nationality: 🇪🇸 Spain

Residency: 🇪🇸 Spain


Experience

Senior Backend Software Engineer
ING
2025 - 2025
– Microservices with Java and Spring Boot (hexagonal, DDD, WebFlux) in the migration of the mortgage domain's core banking system. – Asynchronous communication with Kafka; Docker, OpenShift and Kubernetes; Oracle; CI/CD on Azure DevOps; testing with JUnit, Mockito and K6.
Backend Software Engineer
Quirumed
2024 - 2025
Backend with Java Spring Boot and Spring Cloud Functions; REST and SOAP APIs, Async APIs, integrating Dynamics NAV ERP, Magento 2, Amazon, Channable and Akeneo. – Azure services (Functions, Service Bus, API Management, Logic Apps, Application Insights); batch processes and logistics automation.
Full Stack Software Engineer
Capgemini
2022 - 2024
– Feature development and bug fixing for a client in the railway sector; migration of a monolithic application to microservices. – Spring Boot, Angular, JPA/Hibernate, Spring Security, Docker, PostgreSQL, Oracle, Jenkins and GitLab.
Full Stack Software Engineer
S.A. Agricultores de la Vega de Valencia
2021 - 2021

Skills

ai
api
ci-cd
docker
ethereum
gcp
kubernetes
nosql
openzeppelin
solidity
sql
english
spanish