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José User

@josemou

Technical Lead at Opayo / Elavon who raised deployment cadence to 1–2 production releases daily and supports core payment platforms.

Spain

Message

At Opayo / Elavon, I’m the technical lead for a 5–8 engineer team responsible for core payment and checkout services. I helped transform delivery from monthly releases to 1–2 production deployments a day, with about 90% of company releases now flowing through the team.

I led the migration from stored-procedure workflows to event-driven services and worked hands-on across Apple Pay, Google Pay, Amazon Pay, and card tokenization. My payments work also includes 3-D Secure 2 / SCA, PCI-DSS scope reduction, fraud signals, chargebacks, and settlement and reconciliation flows.

Earlier, at Culture Trip, I architected a move from monolithic WordPress to Kubernetes-based microservices and built high-availability REST APIs. Across my career, I’ve also worked on cloud migrations, payment integrations, and enterprise systems, and I hold an MSc in Computer Science.

Experience

Work history, roles, and key accomplishments

Current

Technical Lead

Current

Opayo / Elavon

Sep 2020 - Present (6 years 1 month)

Technical lead for a 5–8 engineer team owning core payment and checkout services. Drove cross-team initiatives, transformed delivery cadence from monthly to 1–2 daily deployments, and led architectural migration to event-driven services.

Java Spring Boot Kubernetes AWS MS SQL Server MySQL Redis ActiveMQ Apple Pay Google Pay Amazon Pay Visa Mastercard 3DS2 SCA PSD2 PCI DSS Fraud Chargebacks Settlements Reconciliations

Technical Lead

SagePay (Sage Group)

Aug 2019 - Aug 2020 (1 year)

Joined as Technical Lead on the payments engineering team during the Sage Group ownership period. Designed simulator and direct bank integrations over financial protocols and established continuous security patching practices.

Java Spring Boot MS SQL Server MySQL Redis ActiveMQ TNS EuroConex Omnipay BtCardway Security Patching Vulnerability Remediation

Senior Backend Engineer

Culture Trip

Jun 2018 - Aug 2019 (1 year 2 months)

Architected migration from monolithic WordPress to containerized microservices on Kubernetes with event-driven patterns. Built high-availability REST APIs and implemented CI/CD with CircleCI and Terraform.

Java Spring Boot Groovy Kubernetes AWS CircleCi Terraform REST APIs Event Driven Architecture

Senior Technical Consultant

Esure

Sep 2017 - Jun 2018 (9 months)

Led migration of a monolithic insurance application to microservices on AWS with full CI/CD. Designed integrations with AWS Cognito, payment platforms, Mailchimp and Salesforce, and established secure OAuth2 and SAML2 patterns.

Java Groovy AWS Spring Boot RabbitMQ Travis Pact Swagger OAuth SAML CI CD Microservices

Technical Lead

River Island

Oct 2016 - Sep 2017 (11 months)

Migrated legacy POS system (Enactor) to AWS, building a full CI/CD pipeline for retail and POS microservices. Designed and deployed infrastructure using Terraform and CloudFormation.

Java Python Terraform Docker AWS Concourse CircleCi Swagger CI CD Microservices

Senior Developer

Travel Corporation

Nov 2015 - Oct 2016 (11 months)

Designed and built a RESTful API using BDD, migrating thousands of PL/SQL lines to Java; performance improved 50%+ with 80% test coverage. Integrated Java on-prem services, AWS cloud apps, and reporting servers.

Java Pl SQL AngularJS AWS Spring Boot DynamoDB Groovy Spock Cucumber .NET SpecFlow BDD REST APIs

Senior Developer

Thomas Cook

Jun 2015 - Nov 2015 (5 months)

Designed a new checkout API with dynamic ancillary selection per flight leg using TDD. Integrated a new payment provider, improving checkout UX.

Java Mule Spring Framework Jersey Spring Data JPA MongoDB MySQL AngularJS Karma Jasmine Test Driven Development

Senior Java Developer

GBST

Jan 2014 - Jan 2015 (1 year)

FIX protocol engine integration and stock-market trading systems; reporting pipeline.

Java FIX Protocols Trading Systems Reporting

Software Architect & Integration Lead

Simosa I.T. / Abengoa

Jan 2010 - Jan 2014 (4 years)

Designed enterprise integration framework; led Salesforce, SAP, Bizagi (BPM), OpenText and PeopleSoft integrations; architected iOS/Android workflow approval apps (200% performance improvement); managed developer teams.