Founder, Principal Software Engineer & Product Owner @ Gabriel Capeletto LLC
Aug/2024 - Present - Tampa, FL → Seattle, WA - United States of America

• A bootstrapped computer-refurbishment business I founded and run solo — restoring and technically upgrading used machines (added modules, expansion cards, config expansions) to outperform their original specs, sold against planned obsolescence, with customer satisfaction above 99% after 500+ units sold in less than 2 years of operation. In 2026 I extended it into software — GCStore, a device-bound app-distribution platform built and running in production that delivers my own apps onto the hardware I sell — owning the full stack (hardware, backend, ERP, apps) and every product and trust decision.

• Developed the entire portfolio solo through an AI-assisted workflow — specification, implementation, review and commit all run through Claude Code — applying the same requirement-to-code traceability I automated at Mambu.
• GCStore Core — a device-bound app-distribution platform (Go + C#/.NET) — designed and built the whole product across its trust boundary: a private Go backend (Docker→distroless, MySQL/sqlc) that is the source of truth for licensing, entitlement, catalog, and delivery — Ed25519-signed leases, signed-URL package delivery, a contract-first API, staged developer→released rollouts — paired with a deliberately untrusted C#/.NET + Avalonia self-updating tray client (Velopack) on every machine sold, where the locked catalog and buy-offer are UX only and every entitlement decision defers back to the server; shipped to production incrementally.
• Operational Control Plane (ERP) (Python/FastAPI, Angular, MariaDB, Keycloak) — built one cockpit that both runs the company (purchasing → inventory → selling → COGS → KPIs → IRS-grade fiscal close) and administers GCStore Core (catalog publishing, device provisioning, entitlement grant/revoke, license minting, staged launches); creates and syndicates product listings across marketplaces, including our own GCStore Shop.
• GCStore Apps — the software it distributes:
  • GCruiter, a jobs aggregator that pulls openings straight from employers' ATSs (Greenhouse/Lever/Ashby/Workday) into one canonical database (30k+ postings) via pluggable connectors and source-direct change detection — the value sits in the curated employer register. (Java 21 / Spring Boot, Angular, MariaDB)
  • GCflix, a video-on-demand platform with per-content entitlement tokens and a media plane where nginx serves segments directly off disk, so streaming load bypasses the application tier. (Go, React 18 / Vite / TypeScript, MariaDB, nginx/HLS)
  • GCStore Shop, the company's own marketplace — a configurable options/variants catalog, PayPal and Zelle payments with signature-verified webhooks, and an installable PWA with web push, live in production with real products and real payments. (Java 21 / Spring Boot, Angular SSR, MariaDB)
  • Milton, an AI seller live in GCStore Shop — the whole published catalogue is sent as a cached prefix instead of retrieved by search, so he can offer the machine the customer did not know to ask for; the model returns a listing id, a configuration and a pitch; price and availability are resolved afterwards through the same function order placement uses; which model answers, whether the web is reachable and how much may be asked are bought by plan tier, and the persona is tuned from the admin by correcting real conversations. (LLM, cached-prefix context design, structured output contract, per-answer cost metering)
  • gc-stocks-stream, a reactive live market-data service (crypto + equities) that normalizes venue/vendor feeds into a canonical tick/quote contract over Server-Sent Events, self-limiting to each vendor's rate/quota caps as a first-class product constraint (reprising my exchange-access/post-trade market-data work). (Java 21, Spring WebFlux)
• Techstack: Angular, Avalonia, C#/.NET, contract-first API, Docker / distroless, Ed25519, FastAPI, ffmpeg, Go, HLS, Java 21, JPA/Hibernate, Keycloak (OIDC/JWT, RBAC), Liquibase, Linux, MySQL / MariaDB, nginx, PayPal, PWA / Web Push, Python, React, REST/JSON, signed URLs, Spring Boot / WebFlux / Reactor / Data JPA, sqlc, SSE, TypeScript, Velopack, VPS, WebSocket, Claude Code, LLM / Generative AI, prompt engineering, cached-prefix context design, structured output contracts.
• System design and architecture diagrams in the Ventures section of this site.

Senior Software Engineer @ Mambu
Sep/2025 - Sep/2026 - Remote - United States of America

• Mambu is the world's only true SaaS cloud banking platform, serving 230M+ end users across 65+ countries with 500M+ daily API calls for institutions including ABN AMRO, Santander, N26, OakNorth, and Raiffeisen Bank.
• Developed and maintained mission-critical core banking microservices on a cloud-native, API-first architecture deployed on AWS and Google Cloud Platform (GKE).
• Shipped high-traffic distributed services covering accounts, deposits, lending, and payments domains, applying Domain-Driven Design (DDD), event-driven patterns, and reactive programming.

• Delivered Core Banking overdraft products for the U.S. credit-union market — CourtesyPay, a fixed-fee facility backing the customer's positive balance, and Overdraft Line of Credit, its interest-bearing counterpart — both stackable onto a customer's existing account portfolio, in a program that shipped a six-month roadmap in two months and brought local build time from 15 minutes to under 5.
• Implemented scalable Java 17 / Spring Boot microservices with Kafka-based event streaming, ensuring data consistency across distributed transactions and idempotent processing of financial operations.
• Drove observability, resilience, and security improvements through OpenTelemetry instrumentation, SonarQube quality gates, and CI/CD pipelines (GitLab CI / Jenkins); carried on-call rotation and incident response, plus code review and unit, integration and JBehave BDD tests to ensure code quality and system stability.
• Built an AI-assisted SDLC toolchain of composable Claude Code skills that turned business rules into written specifications, derived acceptance criteria from them, and created the corresponding JIRA stories — then generated implementation code from the story itself. Rolled it out across the team and took bug resolution from parity with new reports to 4:1, clearing in weeks a 200+ customer-reported backlog that had queued behind ticket cycles for years.
• Automated merge-request review in GitLab along two axes at once: the company's coding standards and guidelines, and the objective declared in the originating JIRA story; kept a traceability matrix linking requirement, acceptance criterion and the code that satisfies it.
• Generated the test suite from the JIRA story and the code written for it, at three levels: Gherkin / JBehave scenarios for end-to-end business cases, Playwright for browser-driven UX, and an API agent that executed the story scenario by orchestrating the system's endpoints directly.
• Techstack: AWS, BDD, CI/CD, Docker, Eclipse/IntelliJ, Event-Driven Architecture, GCP (GKE), Git, GitLab, Gradle, GWT, Java 17, JIRA, JSON, Kafka, Kubernetes, Liquibase, Microservices, MySQL, Nexus Repo, OpenTelemetry, PostgreSQL, React.js, REST API, SonarQube, Spring Framework, Spring-Boot, AI-assisted SDLC, Claude Code skills & agents, prompt engineering, Gherkin / JBehave, Playwright.

Lead Software Engineer @ The Depository Trust & Clearing Corporation
Feb/2024 - Sep/2025 - Tampa, FL - United States of America

• DTCC is the central post-trade market infrastructure for the global financial services industry, processing securities transactions valued at USD 3+ quadrillion annually, including a record single-day peak of 545M transactions on April 7, 2025.

• Modernized Continuous Net Settlement (CNS) — the core netting, allotting and fail-control engine of U.S. equities clearing, novating trades to NSCC as central counterparty and reducing settlement obligations by ~98% daily (e.g., USD 519T netted to 9T in 2022), eliminating counterparty risk for ~4,000 NSCC participants.
• Engineered and tested the U.S. equities settlement cycle transition from T+2 to T+1 across DTC, NSCC and ITP (May'24), reducing settlement risk across U.S. capital markets, raising same-day affirmation rates from 73% to ~95%, and keeping the CNS Fail Rate at ~2%, consistent with T+2 levels.
• Designed and delivered containerized microservices on AWS (ECS, EKS, Aurora PostgreSQL, DynamoDB, Kinesis, Step Functions, API Gateway, CloudFormation, CloudWatch).
• Built event-driven, fault-tolerant Java / Spring Boot services integrated via Apache Kafka and REST APIs for thousands of broker-dealers, custodian banks, asset managers, and global financial institutions.
• Managed full CI/CD pipelines using CloudBees Jenkins, BitBucket, Nexus Repository, Artifactory, SonarQube, Fortify, and Splunk, enforcing quality gates and security scanning at every commit; mentored mid-level engineers on distributed systems design, microservices best practices, and AWS-native development patterns.
• Techstack: Artifactory, AWS (Aurora PostgreSQL, API Gateway, CLI, CloudFormation, CloudWatch, DynamoDB, Elastic Load Balancing, EC2, ECS, EKS, IAM, Kinesis, Route 53, S3, Step Functions), BitBucket, CloudBees Jenkins, Docker, Eclipse/IntelliJ, Fortify, Git, GitHub & GitLab, Java, JIRA, JSON, Kafka, Kubernetes, Linux, Maven, Microservices, Nexus Repo, Oracle, REST API, SonarQube, Spring Framework, Splunk, Spring-Boot, TomCat.

Senior Software Engineer - Assistant Vice President @ Citibank
Jul/2023 - Feb/2024 - Tampa, FL - United States of America

• Applications Development Senior Programmer Analyst in the Trade Channel Technology, a division of Citi’s Institutional Clients Group, supporting global trade and supply chain finance solutions.

• Owned full-stack development of distributed, containerized microservices for invoice financing and receivables discounting workflows, and led code, design and architecture reviews.
• Project: Citi Supplier Finance (CSF) - web-based supply chain finance solution optimizing Cash Conversion Cycle for Buyers and Suppliers supporting financing for uninterrupted supply flow for Buyers while also supporting the working capital needs of its key suppliers.
• Techstack: Artifactory, BitBucket, Confluence, Eclipse/IntelliJ, Git, GitHub & GitLab, Gradle, Java 8 , J2EE, Jenkins, JIRA, JSON, Kafka, Linux, Maven, Microservices, Oracle, REST API, SonarQube, Spring, Spring-Boot, WebSphere.

Principal Software Engineer (Owner) @ Fernando.Engineer LLC
Jan/2023 - Jul/2023 - Dallas, TX - United States of America

• Delivered web, mobile and backend applications for direct clients under NDA, while relocating from Germany to the United States.
• Techstack: Android Studio, Angular, Docker, Docker-Compose, Eclipse/IntelliJ, Git, GitHub & GitLab, Gradle, Ionic & Capacitor, Java, Jenkins, JIRA, JSON, Kafka, Linux, Maven, Microservices, MySQL, NodeJS, PostgreSQL, RabbitMQ, Redmine, REST API, SonarQube, Spring, Spring-Boot, TypeScript, Visual Studio Code, WebFlux.

Senior Software Engineer @ tick-TS (FRA:TBX0)
Jun/2022 - Nov/2022(*) - Düsseldorf, Germany

• tick Trading Software AG (Frankfurt Stock Exchange: TBX) is a leading European Application Service Provider for direct stock-market access, operating the TradeBase Multi Exchange Platform (TBMX) for 20+ years. TBMX provides direct connectivity to XETRA, EUREX, Euronext Cash, CBOE Europe Equities, Vienna Stock Exchange, and international markets via prime brokers including HSBC Germany, ABN AMRO Clearing Bank, Citibank, UniCredit, and BNP Paribas — serving banks and financial-services providers with several million trade transactions per day.
• Activities: Designed, developed, and extended core components of the TradeBase MX platform — including the TBMX Server, TBMX FIX Engine (industry-standard FIX protocol connectivity), TBMX API, TBMX Frontend, market-making tools for designated sponsoring (XETRA), and the e-Trading Compliance Monitor (ECM) for MAD 2 / MAR regulatory compliance.
• Engineered low-latency Java, Vert.x, and Spring WebFlux components integrated with tick-TS in-house messaging infrastructure, enabling sub-second trade execution across multiple international marketplaces and broker connections; built reactive front-end components using Angular 12, TypeScript, Ionic, and Capacitor (PWA) for trader-facing applications.
• Practiced Test-Driven Development (TDD) under Agile / Scrum: new features, bug analysis and fixing, code reviewing and testing, integration with third-party broker and exchange systems, and technical software documentation.
• Techstack: Android Studio, Angular 12, Artifactory, Confluence, Docker, Eclipse/IntelliJ, ESLint, FIX Protocol, Git & GitLab, Gradle, Ionic & Capacitor, Java, Jenkins, JIRA, JSON, Linux, Microservices, MySQL, Node.js, Prettier, PWA, Redmine, REST API, SonarQube, TypeScript, Vert.x, Visual Studio Code, WebFlux.
• (*) Termination upon my request due to immigration from Germany to the United States after obtaining a permanent immigrant Visa for skilled workers (Green Card).

Software Engineer @ TEAMS @ TBA Group (Konecranes)
Nov/2020 - May/2022 - Düsseldorf, Germany - Letter of Reference

• TEAMS is the TBA's Equipment Control System (ECS) fleet management for automated equipment for container handling at terminal ports.
• Activities: Software development using Agile Scrum (SAFe) methodology, in a continuous delivery environment for the development of distributed, scalable, and highly available applications for TEAMS, including:
  • Design and development of new TEAMS modules, changes & extensions for existing ones.
  • Bug analysis and fixing; Code reviewing and testing; and Software Documentation.
  • Unitary and Integration Tests development (JUnit, Boost-Test, and script-based tests)
  • Java APIs built with the Java Native Interface (JNI) integrating TBA's C++ libraries within Java components.
  • Documentation-as-Code framework created to generate UML diagrams from runtime logs, keeping system documentation current with code that shipped weekly.
  • Mentoring of TBA Master's intern students in machine learning concepts and Python libraries (Scikit-learn, Pandas, NumPy) for supervised and unsupervised learning models applied to terminal optimization.
  • Presentations of functionalities to stakeholders.
  • Hotline service (24h stand-by for customers)
  • Participation in Scrum & SAFe events to improve the efficiency of the development process.
• Techstack: ActiveMQ, AutoCAD, Avro, Boost, C++, Confluence, Corba, Eclipse/IntelliJ, Git & GitLab, Grafana, Hibernate, Java, Jenkins, JIRA, JSON, Jupyter Notebook, Kafka, Linux, Liquibase, Maven, Microservices, Netbeans, Nexus, Oracle, Python, QGIS, REST API, SonarQube, Spring Boot, SQL Server

Lead Software Engineer & Lead System Engineer @ Brazilian Navy
Mar/2010 - Aug/2020 - (~70% Brazil ~30% France)

• Ten years as a Navy Officer of the Corps of Engineers (Lieutenant), working with Software, Hardware and Systems for Naval and Defense domains. (e.g Combat Management Systems; Communication Systems, Sonar System, Navigation and Environment System, Performance Monitoring and Fault Location Systems, Weapons Systems, Air-to-Surface Sensing Systems (such as Periscopes, Radar and Electronic Warfare Support Measures (ESM) and Countermeasures (ECM), among others).
• More than seven years on the Brazilian Navy Submarines Development Program - PROSUB (including three years overseas), working on its specification, development, tests, predictive, corrective, and evolutive maintenance tasks, and IVVQ cycle supplying technical subsidies for management decision-making and strategic planning.

Lead System Engineer (Brazilian Navy representative) @ Ministry of Science, Technology & Innovations
Oct/2019 - Jul/2020 - Brasilia, DF, Brazil - Commendation terms to the Command of the Brazilian Navy

• Technical Analysis of equipment, materials, software, and technologies under General-Coodination of Sensitive Goods responsibility to promote the non-proliferation of nuclear weapons through the implementation of Nuclear Suppliers Group (NSG)  Guidelines for the trade of nuclear and nuclear-related goods.
• Coordinated and arranged the Brazilian Nuclear Supplier Group's technical specialized activities to discuss the technical proposals Nuclear Suppliers Group's control list modifications.
• Support to the Brazilian Navy's strategic nuclear projects pertaining to the procurement and acquisition of vulnerable assets deemed crucial to keep the continuity of the Brazilian Nuclear Submarine Development Program afloat.
• Engendering subsidies and technical assistance to the Foreign Affairs Ministry on issues pertaining to international cooperation treaties.

Lead Software Engineer & Lead System Engineer for Submarines @ Brazilian Navy
May/2015 - Sep/2019 - Rio de Janeiro, RJ, Brazil - Letter of Thanks

• Supervise at the shipyard the processes of Development, Construction, Assembly, Inspections, Quality Assurance (QA), Commissioning, Tests & Trials for the Brazilian Submarines Class Scorpene (SBR) in the Brazilian Navy Submarines Development Program (PROSUB) scope.
• Analysis, Preparation, Execution, and Reports of the Assembly, Installation, Set-to-Work, Tests and Trials Specifications and Protocols (at Factory, Harbor, and Sea), for Equipment, Softwares, Systems, and Systems of Systems (SoS) of the SBRs.

• Creator, Architect, Full Stack DevOps, and System Administrator of SISCAPELA: a Management Information System to Audit and Control the SBR Submarines’ industrial life cycles for its component items and functional circuits. (more details in my Cover Letter and in the Letter of Thanks above)
  • Integrates and processes data from Shipyard’s departments.
  • Show the technical drawings according to the build situation.
  • Verify the requirements’ completeness for launching.
  • Techstack: Front-End: Web Application (JavaScript & HTML5) and JavaSE (GUI); Back-End: Linux, Java, PHP, PostgreSQL/PLSQL, Python & VBA. (2018/2019)
• Combat Systems (CS) - System of Systems Engineering work: HW & SW Technical, Interface and Requirements Specs., Detailed Design Review for Architecture,  Integration, Functionalities & Performance related to the CS and its SubSystems (i.e., Navigation, Combat System Management, External and Internal Communications, Underwater Acoustic,  Air-Surface Detection (e.g. Attack & Optronic Periscopes , Radar and Communication Electronic Support Measures) and Weapons Control). (C4ISR topics)
• Full Stack DevOps of a Tactical and Kinematics Situations Displayer for Vessels SW for evolutionary maintenance for the SBR Combat System (AIS-MK0):
  • Decodes VHF NMEA0183 messages received through a PC serial RS-232.
  • Records and Broadcast contacts detected by an AIS Receiver to the Combat System Network.
  • Techstack: JavaEE, GALAXI®, Framework, Spring & Eclipse IDE. (2015/2017)

Senior Software Engineer for Submarines @ Brazilian Navy
Aug/2012 - Mar/2015 - Toulon, VAR, France - Letter of Thanks

• Engineer of the Brazilian Navy in charge of receive Transfer of Knowledge (ToK) and Transfer of Technology (ToT) (a partnership between France & Brazil) of the Combat System for Scorpene-class submarines SUBTICS®. (a Combat Management for Systems of Systems with millions of code lines, distributed architecture, and heavy constraints on performances and reliability, based on GALAXI® JAVA EE Framework). (Activities @ Naval Group - former DCNS/THALES Group)
• Development of Combat System (Equipment and Interfaces) Simulators and Stimulators belonging to the Combat Systems Network (i.e., Simulator of Electronic Warfare Measurement Equipment).

• System and Software Development and Documentation using V-Model SDLC in compliance with MIL-STD-498 standard:
  • System Engineering (Requirements Analysis, Functional Analysis/Allocation Specification, and Traceability, System Tests Procedures, Tests Campaign, and Reports);
  • System Design (Architecture, Components, and System Interfaces);
  • Software Engineering (Software Requirements Specification, Software Tests Procedures, Test Campaign Design and Running Reports at Unit, Integration, System and Acceptance levels);
  • Software Architecture Design (Software Components, Software Modeling and Software Interfaces);
  • Software Development and Frameworks Analysis, Detecting, Reproducing, Debugging and Solving of functional problems related to the system architecture.
• System & Software Architect, Full Stack DevOps, Integrator, and IVVQ Tester of Mines and Obstacles Avoidance Sonar System (MOAS) for evolutionary maintenance for the SBR Scorpene Submarine Combat System:
  • Requirement specification, modeling, coding, testing, integration, verification and validation activities
  • Provided evolutive maintenance for the SUBTICS® Combat System adding a new sensor from scratch using the V-model development Process.
• Techstack: IBM Rational: Dynamic Object Oriented Requirements System (DOORS), Software Modeler (RSM), Clearcase; HP Quality Center (QC), Eclipse IDE, JavaEE and Frameworks (e.g GEMO (DCNS Framework), Java RMI, Spring), CORBA, DDS-DLRL pattern, Wireshark, Wireshark Dissector.

System Engineer @ Navy Weapon Systems Directorship @ Brazilian Navy
Jan/2011 - Jul/2012 - Rio de Janeiro, RJ, Brazil

• Writing and Analysis of Technical Notes, Reports, and Specification Documents for the acquisition, modernization, replacement, and installation of Electronic and Weapon Systems equipment for Military Organizations and naval assets of the Brazilian Navy;
• Writing, Running, Analysis, and Reports about the Set-to-Work, Harbor Acceptance Trials, and Sea Acceptance Trials of equipment and systems.
• Integrated Logistic Support: Analysis regarding the built-in configuration, allocation, maintenance sheets, and replacement interchangeability feasibility of parts, their component items, and suppliers.

• Modernization for the Class Tupi Submarines’ Combat System (MODSUB):
  • Replacement of the Ferranti KAFS A10 Shooting and Tactical Data Detection System and the CSU83 Sonar by Lockheed Martin 'AN/BYG 501 MOD 1D' Combat System) (2011)
  • Elaboration of Technical Specification for the Installation of the Attack Simulator at CIAMA (Submarinists Instruction Center) (Based on Autodesk AutoCAD®)
  • Analysis of the User and Equipment Technical Manuals and of the Protocols for Sea Acceptance Trials for the Modernized Combat System.
  • Running the Sea Acceptance Trials for the new Combat System installed in Submarine Tapajó (S-33) (10 days on the sea / 86 hours of immersion).
  • Writing Technical Requirements Specification and Interface Agreement between the 'AN/BYG-501 Mod 1D' Combat Management System and 'AR-900(V)1' Electronic Support Measures, aiming to the Combat Management System to Electronic Support Measures integration, onboard on Brazilian Navy Tupi and Tikuna Classes Submarines.
• CercaSys: Integration of a legacy Navy ́s alarms system for fences monitoring of restricted areas into a PC:
  • Developed prototyped a Signal Integration Card for PC via DB25 parallel interface.
  • Techstack: C++, Cadence OrCAD PCB Designer and OrCAD Pspice Designer (2010)