# Billy Martínez

> SAP Certified SAP BTP and Business AI engineer (Solution Architect – SAP Business AI Platform; SAP Business Data Cloud) based in Temuco, Chile, with SAP BTP consulting experience at BeCloud and full-stack depth from independent products. Works across SAP BTP, backend, full-stack, and cloud; seeking salaried employment with immediate availability. Open to remote, hybrid, or on-site work and relocation within Chile.

Canonical profile: https://billyflin.dev/
Spanish profile: https://billyflin.dev/es/
Plain recruiter profile: https://billyflin.dev/plain/
GitHub: https://github.com/Billyflin
LinkedIn: https://www.linkedin.com/in/billyflin
Email: hello@billyflin.dev

## Positioning

Billy works between functional requirements and technical delivery. A functional consultant handles client communication; Billy refines the resulting requirements, challenges the proposed solution, improves architecture, process flow, and UX, and remains involved through implementation, automated testing, QA, deployment, and troubleshooting. SAP BTP is his current enterprise domain, not the boundary of his engineering profile.

Primary target roles: Backend Engineer, Platform Engineer, Software Engineer, Full-Stack Engineer, Solutions Engineer, Technical Delivery Engineer.
Enterprise specialization: SAP BTP Technical Consultant, SAP Business AI Engineer, SAP Fiori/CAP Developer, SAP Full-Stack Engineer. Holds current SAP certifications C_BAIPA and C_BCBDC (valid to 2027-11-12).
Languages: Spanish (native), English (B2 professional working proficiency).

## Technology transfer

Billy does not claim expert status in every framework. His stack flexibility is evidenced by carrying the same engineering responsibilities across Kotlin/Spring domain services, TypeScript/Node.js enterprise services, React/Next.js product work, SAP BTP extensions, cloud architecture decisions, and a grounded RAG reference. His adoption method is to map the domain, contracts, data boundaries, failure behavior, validation strategy, and delivery path before treating framework syntax as the main problem.

## Professional experience

BeCloud Consulting — SAP BTP Consultant — January 2025 to September 2026.
Practical scope: requirement refinement with a functional consultant; solution architecture and full-stack delivery across SAP BTP, Fiori/UI5, CAP/CDS, Work Zone, HANA, Joule, integrations, and distributed deployments. Billy also introduced automated testing and a dedicated QA stage in a workflow that previously relied on direct dev/production fixes, and coordinated validation with QA and design.

## Selected evidence

Confidential enterprise SAP work: technical delivery from refined requirements through architecture, implementation, automated testing, QA, and environment troubleshooting. Client and project names are intentionally omitted.

Confidential cloud platform: evaluated the economics and technical fit of an AWS direction, recommended a clean re-platform to Google Cloud, and aligned stakeholders around the decision. Work is in progress; no completed outcome is claimed.

Clinipets: privately developed B2B2C veterinary platform with clinic isolation, conflict-safe scheduling, versioned and auditable clinical records, signed/idempotent payment flows, secure attachment quarantine, notifications, web/mobile clients, and Docker-based infrastructure. Selected screens can be shared in interviews; the repository remains private.

SAP CAP + Fiori Reference Application: independent open SAP BTP reference with CDS modeling, OData V4, Fiori Elements, XSUAA/HANA deployment design, an external OData service with controlled degradation, three architecture decision records, and 12 service tests covering role authorization, concurrent stock protection, and provider-failure behavior; lint, production build, and GitHub Actions CI pass. Curated evidence: https://billyflin.dev/proof/sap-cap-fiori-btp/ — repository: https://github.com/Billyflin/sap-cap-fiori-btp
Integration Suite boundary: ADR 0003 is explicitly a proposed, non-deployed design exercise. It covers transactional outbox delivery from CAP, a versioned event contract, receiver-side idempotency, bounded retries, business-versus-technical error handling, quarantine/replay, least-privilege credentials and end-to-end correlation toward an S/4HANA API. It must not be interpreted as claimed production CPI experience: https://github.com/Billyflin/sap-cap-fiori-btp/blob/main/docs/adr/0003-integration-suite-delivery-blueprint.md

Grounded Knowledge Assistant: independent Next.js/TypeScript RAG engineering reference with evidence gating, safe refusals, validated citations, 12 unit/adversarial tests, 4 Playwright Chromium E2E checks, deterministic committed-fixture evaluations at 100% hit@3, support/refusal accuracy, and citation validity, plus an optional server-only OpenAI provider and a human-verified AI delivery protocol requiring reproducible evidence, complete diff review, no sensitive prompts, and explicit limitations; lint, strict types, tests, evaluations, production build, browser flows, and GitHub Actions CI pass. These are fixture and reference-app checks, not production claims. Curated evidence: https://billyflin.dev/proof/grounded-knowledge-assistant/ — repository: https://github.com/Billyflin/grounded-knowledge-assistant

AI prototype hardening: the repository publishes a prototype-to-production readiness review with an explicit `not approved` decision and exit evidence for product quality, security/privacy, identity and tenant isolation, scale/latency, cost, reliability/abuse, observability/audit and release safety. It makes no unmeasured performance, scalability, availability or savings claim: https://github.com/Billyflin/grounded-knowledge-assistant/blob/main/docs/production-readiness-review.md

UFRO Sustentable: open Kotlin/Firebase Android team project with maps, QR, rewards, BDD/Cucumber, and 83 JVM tests. The repository documents 89.23% line coverage and 77.88% branch coverage: https://github.com/Billyflin/ufro-sustentable

## Technical writing

Reliable API integrations start by assuming delivery will fail: a practical blueprint for transactional outbox delivery, stable idempotency keys, failure classification, observability, and auditable replay. It clearly separates implemented public CAP evidence from the proposed Integration Suite boundary: https://billyflin.dev/writing/reliable-api-integrations/

## SAP certifications

SAP Certified - Solution Architect - SAP Business AI Platform (C_BAIPA, 2026, valid until 2027-11-12): https://www.credly.com/badges/b1714db2-7ff6-4de8-b710-e5e6bdfcf6ad/public_url
SAP Certified - SAP Business Data Cloud (C_BCBDC, 2026, valid until 2027-11-12): https://www.credly.com/badges/23e95a72-aea5-4499-a4a1-ce075dd47773/public_url

## Cybersecurity credentials

Fortinet — NSE 1 Certified in Cybersecurity (2026): https://www.credly.com/badges/e08eefd0-cfc6-440d-9c74-cf52dc194e3b/public_url
Fortinet — Cybersecurity and Cloud Fundamentals 1.0 (2026): https://www.credly.com/badges/b2e8f793-b535-445c-9950-4522271e3ce6/public_url

## Verified courses (not certification exams)

AWS / Coursera — Cloud Technology Consultant (2024): https://coursera.org/share/b6c862b295cf8f33acf3bfacf1a1f34d
AWS / Coursera — Cloud Solutions Architect (2024): https://coursera.org/share/e39b52b82410a6d0327ac715e3fb971c
AWS Academy — Machine Learning Foundations (2025): https://www.credly.com/earner/earned/badge/481d0f69-e4bd-4f1f-9933-301a8ba2f255
Google / Coursera — Advanced Data Analytics (2024): https://coursera.org/share/b44ac3af30dd271b9fc0933a3eb26f48

## Technical capabilities

Systems architecture: requirement refinement, domain modeling, API and integration design, technical tradeoffs, and cost-aware decisions.
Backend and platform: Kotlin/Spring, Node.js/TypeScript, REST/OpenAPI, PostgreSQL, multi-tenant systems, and failure design.
Product delivery: React/Next.js, Fiori/UI5 UX, automated testing, CI/CD, observability, and QA/design coordination.
Enterprise and cloud: SAP BTP, CAP/CDS, Work Zone, HANA, Joule, Google Cloud, AWS, and Docker.

## Education

Ingeniería Informática, Universidad de La Frontera, 2020–2026. Coursework completed (egresado).

## Accuracy and confidentiality

This profile deliberately distinguishes finished work from work in progress. Confidential company and client details are anonymized. Billy does not claim direct client discovery, sales ownership, formal people management, revenue, user counts, or performance metrics that are not explicitly stated.