Architecture Advisory
Your team is making expensive decisions without enough technical direction.
- Architecture audit
- Solution design
- Modernization roadmap
- Tech debt review
AI-Driven Boutique Engineering Studio
Engineering clarity for complex software systems.
hxa.dev is an AI-driven boutique engineering studio helping companies design reliable backends, modernize legacy platforms and ship smarter with AI-augmented engineering.
by Alfonso Hernández Xochipa · Software Engineer Lead | Architect
Experience
10+Years delivering enterprise systems
3Banking & fintech platforms in production
6Countries with active deployments
- Fintech
- Banking
- Government
- SaaS
- E-commerce
- Healthcare
- Education
- Logistics
- Media
- AI
AI-Driven Engineering
We build with AI. Not around it.
AI is not a bolt-on feature at hxa.dev — it is embedded in how we design, build, and deliver. From intelligent code generation to automated architecture analysis, every engagement benefits from AI-augmented engineering workflows.
AI-assisted code review & generation
Automated architecture analysis
Intelligent testing & QA pipelines
LLM integration & prompt engineering
AI-powered legacy code assessment
Predictive system monitoring
Services
Where senior engineering makes the difference.
Backend Engineering
You need a system built right — not just built fast.
- REST APIs
- Microservices
- Modular monoliths
- Async processing
- Distributed systems
Legacy Modernization
Your platform is slowing down growth instead of enabling it.
- API migration
- Monolith decomposition
- DB migrations
- Blue-green strategies
Fractional CTO / Tech Leadership
You need senior technical direction but not a full-time hire yet.
- Tech direction
- Standards definition
- Team mentoring
- Vendor evaluation
AI-Driven Engineering Automation
You need to automate your engineering processes with the help of AI.
- Automated code review
- Intelligent testing
- Predictive maintenance
- AI-powered development tools
Case studies
Systems that hold up under real conditions.
A curated showcase of solutions I've architected and built.
Channel Calculations
2016 - 2018
- Challenge
- Implementing precise mathematical algorithms for hydraulic channel calculations and presenting them in an intuitive desktop interface for engineers, with flexib...
- Solution
- Desktop application in Java 7 with Java Swing for the graphical interface. JPA with Microsoft Access for data persistence. Implementation of hydraulic formulas...
POS System
2016 - 2019
- Challenge
- Implementing a POS with real-time PDF generation flexible enough to adapt to customer needs, including compatibility with different printers and ticket formats.
- Solution
- REST APIs in Java 8 with Jersey framework for transaction processing and business logic. PHP 7 frontend with HTML5/CSS/JavaScript. PDF generation with iText. My...
RFID School Roll Call
2019 - 2020
- Challenge
- Integrating physical hardware (Raspberry Pi + RFID scanner) with real-time web software, ensuring reliable communication between the IoT device and web server w...
- Solution
- Hardware module in Node.js running on Raspberry Pi for RFID reading and Websocket communication. REST API in Node.js with Yarn. Web interface in PHP and HTML5 w...
Architectural Inventory API
2021 - 2022
- Challenge
- Designing APIs that covered the complex inventory flows on construction sites (inputs, outputs, transfers) and were consumable from mobile applications with hig...
- Solution
- REST APIs in Node.js with Express for main endpoints. Complementary microservices in Python with Flask. MySQL database with optimized schema for inventory. NGIN...
Industrial Mobile App & REST APIs
2022 - 2023
- Challenge
- Developing a mobile app that worked efficiently on industrial Zebra devices, integrating secure APIs with OAuth2, real-time inventory management and robust sync...
- Solution
- Mobile app in React Native with TypeScript optimized for Zebra hardware. Backend in .NET 7 with Entity Framework and SQL Server. NGINX as reverse proxy with OAu...
Enterprise ERP Legacy Migration
2020 - 2022
- Challenge
- Migrating critical enterprise production systems from obsolete technologies (Clipper/Basic/Pascal) to modern Delphi without losing historical data, maintaining...
- Solution
- Requirements analysis with UML and process modeling. Modular development in Delphi Embarcadero with Object Pascal. SQL Server database with stored procedures. R...
CSQ Non Stop
2024 - 2025
- Challenge
- Migrating production APIs from legacy technologies (Java 6/8 and .NET) to Java 18 without interrupting existing services, while implementing a complete CI/CD pi...
- Solution
- Incremental API refactoring with Spring Boot for Java 18. PL/SQL and SQL Server for the data layer. Jenkins pipelines integrated with Azure Cloud for CI/CD. Blu...
Rullan ERP — Legacy & Modernization
2020 - 2021
- Challenge
- Understanding and developing on legacy ERP platforms with technologies like Clipper and Delphi 7, then migrating that knowledge to the modern ERP in Delphi 15,...
- Solution
- Module development in legacy ERP with Delphi 7, Clipper and Pascal Object. Module development in modern ERP with Delphi 15 and Pascal Object on SQL Server. Stor...
Java ERP Modules — Verification & Billing 4.0
2020 - 2021
- Challenge
- Developing complex ERP modules with pure Java 11 without framework (no Spring or Jakarta EE) using JDBC and JAX-RS, understanding the E2E flow of Mexican electr...
- Solution
- ERP module development with native Java 11, JDBC for data access and MVC pattern as main architecture. JAX-RS for REST endpoint creation. Implementation of the...
Patrimonial Declaration App
2021
- Challenge
- Developing from scratch a complete Xamarin mobile app under the MVVM pattern with business logic in Azure Functions, ER model refinement of the main database, a...
- Solution
- Mobile app development with Xamarin under MVVM pattern. Azure Functions implementation with exact business logic for each app module. Refinement of the main dat...
Linux On-Premise Infrastructure
2016 - 2017
- Challenge
- Designing and implementing from scratch a robust and secure on-premise infrastructure for pre-production environments of a government platform, ensuring isolati...
- Solution
- Installation and configuration of on-premise Ubuntu Server with specific IP segment assignment per environment. WildFly/JBoss deployment in dual DEV and QA inst...
Judicial Branch CDMX
2018 - 2021
- Challenge
- Developing critical biometric software for the government precautionary measures system, integrating specialized Safran and Idemia hardware, including the devel...
- Solution
- Web module development in PHP 8, HTML, CSS and JavaScript with Oracle database. SOAP Web Services with JAX-RS and JAX-WS in Java 7, WSDL entities for inter-gove...
CBDC — Sovereign Digital Currency
2021 - 2022
- Challenge
- Leading a multicultural team to build in just 6 months the pilot for a critical and unprecedented financial infrastructure: the first CBDC of a Caribbean centra...
- Solution
- Microservice development with Java 11 and Spring Boot under SAGA orchestration with Apache Kafka. Persistence with Hibernate, JPA and PostgreSQL. Integration wi...
Enterprise Banking Migration
2022
- Challenge
- Migrating legacy MuleSoft APIs to Java Spring Boot without disrupting production banking services, maintaining compatibility with existing systems, and respondi...
- Solution
- Incremental API development with Java Spring Boot as a replacement for legacy MuleSoft services. Parallel maintenance during the transition and a 24/7 on-call s...
B2B SaaS MVP
2024
- Challenge
- Building a robust MVP in just 3 months, solid enough to present to investors, with a modular architecture that could easily scale to microservices without signi...
- Solution
- Design and implementation of Modular Monolith architecture with Spring Modulith and Java 17. API First with OpenAPI and API Dog. Internal event handling with Sp...
Enterprise LLM Implementation
2023 - 2024
- Challenge
- Creating a reusable, white-label abstraction over Azure Cognitive Search and GPT-3 that would allow an organization to train an LLM agent on its own document kn...
- Solution
- Implementation with Python 3 and Flask under Lato Modulith architecture. Integration of Azure Cognitive Search as a semantic search engine and GPT-3 Azure as th...
Caribbean Fintech Wallet
2022 - 2023
- Challenge
- Ensuring data consistency in distributed financial transactions (SAGA) with high event volume, enforcing SAST and DAST security practices in code, and maintaini...
- Solution
- Microservice development with Java 11, Spring Boot and Node.js under SAGA orchestration with Apache Kafka. Azure Cloud deployment with CI/CD pipeline review and...
Global Banking Platform
2024
- Challenge
- Leading customer migration to a new global banking platform ensuring service continuity, coordinating teams under high corporate visibility, and maintaining qua...
- Solution
- Design and implementation of microservices with Java 11/17/21, Spring Boot 3 and Hexagonal architecture. Asynchronous communication with Apache Kafka, caching w...
How we work
Four steps. No ceremony.
-
01
Discover
Understand your system, constraints and business context.
-
02
Design
Define the architecture, approach and delivery plan.
-
03
Deliver
Build or guide implementation with engineering rigor.
-
04
Evolve
Refine based on real system behavior and team feedback.
Engagement models
Work with me the way that fits.
1–2 weeks
Advisory Sprint
Diagnosis and technical direction.
1–6 months
Engineering Engagement
Specialized technical implementation. Closed project or monthly dedication.
Ongoing
Technical Partnership
Monthly retainer. Architecture support, technical decision review, leadership and mentoring.
About
I'm Alfonso Hernández Xochipa.
A Software Engineer and Architect with 8 years designing and building critical systems for banks, fintechs and digital platforms across Mexico, Jamaica and Canada.
I work at the intersection of backend engineering, distributed systems and technical leadership. My focus is on systems that have to work — under load, under pressure, and over time.
hxa.dev is how I bring that experience directly to teams and companies that need it.
I build digital experiences focused on usability, clean architecture and modern technologies.
Writing
Notes on engineering
Field notes on architecture, backend engineering and building software that holds up — from the hxa.dev studio.
Let's talk about your engineering challenge.
I typically respond within 24 hours.