More than 10 years building and leading production software for banks, government and high-traffic US platforms.

I design, build and lead production systems where correctness is not optional: banking platforms that move real money, government infrastructure connected to Argentina's Central Bank, and US-facing SaaS products serving thousands of users and 160+ venues nationwide.

My background spans Spanish banking groups (BBVA, Santander), Canadian banking (Scotiabank), Argentina's largest payment processor, provincial government, a Fortune 500 healthcare company (GE HealthCare) and a portfolio of US clients in telematics, e-commerce, ticketing, media and aviation.

I work as a hands-on Tech Lead: architecture decisions, backend and DevOps ownership, code review, mentoring, and direct communication with clients and stakeholders in English. I am comfortable owning a system end to end, from data model and infrastructure to production incident response, and I bring the discipline of regulated environments (security, compliance, auditability) to every project.

FaMAF is one of Argentina's most respected faculties for mathematics and computer science: mathematical analysis, discrete mathematics, algorithms and the theoretical foundations of computation. UTN is the hands-on, industry-oriented counterpart: object-oriented programming, relational modelling, operating systems, Java, .NET, JavaScript.

I started as a self-taught programmer and formalized the foundation with university study while working full time.

Banking compliance training, BBVA Campus, 2022. Mandatory regulatory curriculum for staff of a systemically important bank: Anti-Money Laundering and Counter-Terrorism Financing, Code of Conduct, Conduct Policy in Securities Markets, Personal Data Protection (Argentina), Information Security, Cybersecurity Essentials, Health and Safety, Sustainability.

Backend, DevOps and tech lead work across regulated US products in three federally supervised industries: commercial trucking (DOT and FMCSA, the Federal Motor Carrier Safety Administration), firearms retail (FFL, Federal Firearms License holders regulated by the ATF) and aviation (FAA, Federal Aviation Administration).

Fleet telematics and DOT compliance SaaS. Owner of the maintenance backend domain: work orders, scheduled maintenance, DVIR inspection reports, issue lifecycle state machines. Built a fleet-wide dashcam certification system with forensic logging and the video clip request API. Led the FMCSA compliance scope and evidence-retention analysis. Found and closed a cross-tenant authorization defect. Telematics device and MDM hardware integrations over the message bus. Hundreds of fleets, thousands of tracked vehicles, around 5,000 devices reporting telemetry.

Regulated firearms e-commerce (FFL dealers). Catalogue integration with a top US distributor (tens of thousands of SKUs), FFL verification and transfer-authorization workflow, MAP pricing, payment, shipping and JWT integrations, 40-plugin stack audit.

FAA examiner platform (Designated Pilot Examiners, the FAA-authorized examiners who conduct pilot checkrides). Tech lead from MVP to production for a six-developer team. Architecture, AWS deployment (EC2, nginx, TLS, Docker Compose across dev, staging and production, DNS, Stripe, transactional email), backend, React Native mobile and Figma-to-code frontend.

Cross-project. Production incident war rooms, root cause analysis in unfamiliar codebases, internal tooling (Python certification harness, Selenium automation, issue-tracker CLI).

See Tickets US, now Eventim USA. Owned the WordPress plugin installed by 160+ venue sites nationwide to list events and sell tickets: REST integration with the ticketing microservices, data modelling and caching strategy, concurrency and security patterns carried over from banking, legacy cleanup, cross-host compatibility, publishing on WordPress.org, Docker environments and automated tests. Stayed through the acquisition by CTS Eventim, the world's second-largest ticketing group, working with teams in Germany.

FLYING Media Group, now Firecrown. Solo engineer on the high-traffic news site of the most recognized aviation magazine in the US. Cut page load from 15 seconds to under 500 milliseconds with New Relic profiling, Redis Object Cache, OPcache, SQL Monitor and query tuning.

Scotiabank is one of Canada's five largest banks and one of the most international banks in the Americas. Migration of a legacy Java monolith to Spring Boot microservices with a modular React frontend for personal and corporate guarantee workflows, with adapters to COBOL core-banking services. Designed and built the guarantee-domain microservices: REST contracts, OpenAPI documentation, unit and integration tests, COBOL adapters. Multiple microservices per day at peak. Domain migration completed within the three-month window. Invited to the follow-on initiative for the Chilean operation. Worked under the bank's security program: OWASP Top 10, secure coding standards, review gates.

BBVA Argentina, formerly Banco Francés, was founded in 1886 and is one of the oldest and largest financial institutions in the country, part of the Spanish BBVA group. Led the migration from hardware tokens to a digital soft-token platform validating transactions at COELSA (Argentina's clearing house) and supporting international wires for major corporate clients. Redesigned session management for web and mobile banking. Upgraded digital channels for WCAG and JAWS accessibility compliance under Central Bank rules.

Santander Argentina, formerly Banco Río de la Plata (founded 1908), is the largest private bank in Argentina and part of the Spanish Santander group. Stabilized and modernized mutual fund (FCI) transaction flows across web and mobile: Spring Boot microservices integrated with legacy COBOL services, Angular and Sass frontend. Delivered on time under the architecture team's guidelines, still in production.

Flexxus is a Córdoba-based ERP used by more than 5,000 Argentine companies. Sole owner of a PrestaShop module giving retailers' customers in-store shipment tracking through the Correo Argentino and Andreani REST APIs during the COVID lockdown. Analysis, design, build and maintenance. MVP shipped in two weeks, then extended across multiple retail stores.

Sitecore-certified developer administering key sections of the GE HealthCare global website. Helped transition support and content operations from India to Latin America: deployments, integrations, validations, coordination and training of LATAM content creators, daily collaboration in English with US and India teams.

Built FTA Go, a court-ordered bank garnishment platform for the provincial prosecutor's office: SOJ judicial electronic orders, Central Bank (BCRA) banking network through COBOL files, CiDi digital identity, multi-step validation wizard. Four-person Scrum team led by Gabriel Serralta, later IT Director General at INDEC.

2010 to 2012. Freelance web development for international clients.

Everything below has been used in production on the projects above.

Working knowledge, not production-deep: Kafka, Snowflake, dbt, Next.js, Kubernetes.

7,156 GitHub contributions in the last year across client and personal repositories.

Senior and Staff Full Stack Engineering, Tech Lead and Engineering Management, System Architecture and Backend Leadership, and high-impact contract work with US and international companies. Remote, USD.

Juan Manuel Ramallo
Senior Full Stack Engineer and Tech Lead, Córdoba, Argentina