01
Backend
.NET 10, Entity Framework, RESTful APIs, Worker Services, Minimal APIs, Polly, xUnit, Moq
AI · .NET · React · Cloud
Senior Software Engineer.
I design and build scalable applications with .NET, Azure, and React. At PayRetailers, I develop with AI from documented requirements and designs, reviewing the code at every stage.
Barcelona, Spain
Cristian GimenezBarcelona, Spain
Currently at PayRetailers
- Years of experience
- 14+
- Stores integrated at UST
- 300
- Performance gain on Dell project
- ~30%
- Test coverage on Dell project
- ~80%
About
Senior Software Engineer with 14+ years of experience in .NET, Azure, and React. I design and build payment integrations, cloud services, and scalable applications from architecture through deployment. At UST, I integrated 300 Burger King stores and improved performance of a Dell application by approximately 30%, reaching nearly 80% test coverage.
At PayRetailers, I delivered a payment integration end to end as the sole developer using an internal AI-assisted development process (AI SDLC) based on OpenSpec. I first validate functional and technical requirements with Product, Finance, Development, architecture, and Infrastructure; I then implement in stages from that documentation and review the generated code in each phase.
I have also integrated generative AI into production systems through backend services that consume language models and vendor APIs. I participate in testing, fixes, and deployments, focusing on quality, observability, and security.
Key Achievements
- Migrated multiple services from Azure Functions to a Service Bus worker architecture, enabling Kubernetes-native deployments.
- Delivered a payment integration end to end as the sole developer, guiding AI-generated code with approved specifications and staged review.
- Led an end-to-end virtual credit card system (AMEX/Mastercard) from inception to deployment with high security and scalability.
- Integrated Azure Key Vault and Auth0 to strengthen authentication and secrets management.
- Integrated 300 Burger King stores into an existing ecosystem via a .NET hosted service with business validations.
- Improved a critical enterprise application performance by ~30% and brought unit test coverage to ~80%.
- Reduced connectivity-related issues in a high-traffic app by ~40% and increased app store positive feedback by ~20%.
Core Skills
02
Frontend
Angular, React, TypeScript, JavaScript, Node
03
Data
SQL Server, Oracle, DynamoDB, Azure Cosmos DB, MongoDB, Redis
04
Cloud & Messaging
Azure Functions, Azure Service Bus, Key Vault, Application Insights, AWS Lambda, API Gateway, AWS SQS, AWS SNS
05
DevOps & Observability
Azure DevOps, Bitbucket Pipelines, GitHub Actions, Docker, Kubernetes, Terraform, OpenTelemetry, Grafana, Elastic Search
06
Engineering Practices
AI SDLC with OpenSpec, spec-driven development, review of AI-generated code, DDD, TDD, CQRS, Event-Driven Architecture, Agile, Scrum, Kanban, Claude Code, Cursor
Experience
July 2025 – PresentBarcelona, Spain
Senior Software Engineer
Pay RetailersPayment Processing
Context: Payment processing platform with business-critical integrations.
Responsibility: I develop payment processing integrations and AI-enabled features. Within PayRetailers' internal OpenSpec-based AI SDLC, I take part in validating functional requirements with Product and Finance, reviewing technical design with Development and architecture, and preparing deployment with Infrastructure.
- Successfully migrated multiple services from Azure Functions to Service Bus–based worker architecture, enabling Kubernetes-native deployments.
- Delivered a payment integration end to end as the sole developer, using requirements and design documented in the internal OpenSpec-based AI SDLC to guide AI-assisted implementation and review code at each stage.
- Took part in provisioning infrastructure with Terraform and deploying to DEV and STG; I tested the solution in DEV and fixed issues. The QA team ran AI-generated automated tests based on the initial documents before production deployment.
January 2024 – July 2025Barcelona, Spain
Full Stack .NET Core Developer
TravelportvPayment
Context: Virtual payment solution for AMEX and Mastercard card generation.
Responsibility: Led the development of the virtual credit card generation system from inception to deployment, ensuring high security and scalability.
- Architected the system from scratch integrating Azure Functions, Cosmos DB, and Key Vault, ensuring security and end-to-end traceability.
- Implemented Azure Key Vault and Auth0, strengthening authentication and secrets management.
June 2023 – December 2023Barcelona, Spain
Career Transition
Career break dedicated to upskilling in frontend technologies, including Angular and React (Udemy, 2023).
October 2021 – May 2023Barcelona, Spain
Full Stack .NET Core Developer
USTRB Iberia (Burger King Portugal & Spain)
Context: Integration of 300 Burger King Portugal stores into the existing Spain ecosystem.
Responsibility: Led the integration by building a .NET 7 hosted service to ingest data, validate business rules, and call internal APIs with reliable data flow.
- Delivered the project under tight deadlines while maintaining high reliability and production readiness.
- Helped introduce Agile practices with the client, improving planning and delivery predictability.
Dell
Context: Critical enterprise application with clear opportunities for technical improvement.
Responsibility: Played a key role in refactoring one of Dell's most critical applications to improve code quality and overall performance.
- Enhanced application performance by 30% through code optimization and refactoring.
- Achieved 80% test coverage by writing missing unit tests.
November 2019 – October 2021Rosario, Argentina
Freelance .NET Core Developer
FreelanceDelivered end-to-end improvements across multiple .NET applications, focusing on modernization, performance, and production stability.
- Migrated 5+ legacy applications to modern architectures and deployment practices, reducing technical debt and simplifying ongoing maintenance.
- Built REST APIs and backend services in .NET Core for clients across different industries, delivering production-ready solutions.
October 2018 – April 2019Sydney, Australia
.NET Core Developer
Adrenalin MediaHungry Jack’s (Burger King)
Enhanced a high-traffic application with thousands of active users by adding new features, fixing bugs, and improving performance.
- Improved app stability, reducing connectivity-related issues by 40%.
- Increased positive feedback on app stores by 20%.
June 2016 – June 2018Christchurch, New Zealand
Full Stack Developer
Stratos Technology PartnersWineWorks
Context: Legacy application in the wine bottling and warehousing domain that required full modernization.
Responsibility: Rebuilt the application from scratch and supported migration of 200+ clients to the new platform.
- Reduced errors in production work orders by 30% through improved validations.
- Enhanced user experience with a redesigned AngularJS interface.
Metrocard
Context: Public transport payment portal serving a high-volume active user base.
Responsibility: Enhanced the payment system to support balance checks, top-ups, and personal data updates through a more stable user experience.
- Developed a secure and reliable portal for over 200,000 active users, improving system stability and reducing transaction errors by 20%.
November 2015 – April 2016Rosario, Argentina
Full Stack Developer
Rosario Bus S.A.IntraBus
Context: Internal operational solution focused on driver communication and administrative workflow digitization.
Responsibility: Worked with business stakeholders to define scope, timelines, and delivery priorities while implementing and deploying the solution.
- Delivered a more reliable communication channel for bus drivers, reducing misunderstandings caused by informal communication.
- Reduced paper usage by 70% by replacing timetable and leave forms with online workflows.
July 2013 – November 2015Rosario, Argentina
.NET Developer
GlobantTenaris - Dispatch Planning
Developed a system for managing dispatched baskets, transport types, and notifications.
- Improved user ability to view and modify critical information in real-time.
- Streamlined business processes and reduced manual errors.
November 2011 – July 2013Rosario, Argentina
SharePoint 2010 Developer Administrator
NeorisNeoEnergia
Implemented SharePoint 2010 solutions combining out-of-the-box capabilities and custom development for enterprise collaboration needs.
- Created a common layout for 8 companies within the NeoEnergia group.
- Consolidated shared functionalities so each company could enable or disable them based on availability.
Education
BSc in Computer Systems Analysis
Instituto Superior San Pablo — Villa Constitución, Santa Fe, Argentina
Additional Courses
- Angular: From zero to Expert (Udemy, 2023)
- React: From zero to Expert (Udemy, 2024)
- AI Engineering with Claude Code (Anthropic, 2026)
Certifications
Google Associate Cloud Engineer
April 2023
ID: aOL1JI
Google Cloud Digital Leader
December 2022
ID: QSLPH9
Languages
Spanish
Native
English
Professional working proficiency (B2)
Contact
Phone: +34 685 890 502
Email: cristiangimenez86@gmail.com
Location: Barcelona, Spain · Remote · Hybrid
Preferences: .NET, React, Cloud-native architectures, Microservices, AI-powered systems