SYSTEM STATUS: ACTIVE
New Jersey, USA (open to Remote)•Open to backend & full-stack roles

Senior Backend /
Full-Stack Engineer.

I build secure, high-throughput platforms with a strong focus on payments, scalability, and clean architecture. Over 9 years delivering production systems across fintech and SaaS, from APIs and microservices to modern web UIs.

LinkedInGitHub
Fintech / POSNode.js + TypeScriptPHP LaravelReact / Angular / VueSecurity mindset

Key highlights

Years of experience
9+
Backend + full-stack
Core domains
Fintech, POS, SaaS
Security + compliance mindset
Strengths
Architecture + delivery
Hands-on builder

What you can expect

Clear ownership and delivery
Pragmatic architecture decisions
Secure-by-default implementation
Strong collaboration and communication

// PROFILE

About

Who I am

I'm a senior backend and full-stack software engineer with over 9 years of experience building secure, scalable systems and product-driven web applications. My strongest domain is fintech—particularly payment systems, POS platforms, and transaction workflows where correctness, security, and reliability are non-negotiable.

I work primarily as a backend engineer, designing APIs, services, and data models that support real-world operational needs. I'm hands-on and comfortable owning features end-to-end, from backend architecture and integrations to performance tuning, observability, and the frontend layers needed to deliver complete products.

Backend-first full-stackPayments & POSMicroservicesSecurityPerformance

Role targets

Senior Backend Engineer
Node.js/TypeScript or PHP/Laravel; APIs, data, reliability.
Senior Full-Stack Engineer
Backend-heavy, with React/Angular/Vue for product UI.
Fintech / Payments
Transaction accuracy and reliability, integrations, security, and scale.

// TOOLBOX

Skills

Backend

Node.js (NestJS, Express)TypeScriptPHP (Laravel)REST APIsMicroservicesAuthentication & securityCI/CD pipelines

Data

MySQLPostgreSQLSQL modelingEvent scheduling / recurrenceRedisMongoDBPerformance tuning

Frontend

AngularReactVueResponsive UIDesign systems

Platform

DockerNginxApacheAWS

What I optimize for

Correctness under load
I design data flows and APIs to be resilient, measurable, and predictable.
Security-first defaults
Authentication, authorization, and sensitive data handling treated as core design constraints.
Maintainability
Conventions, modular boundaries, and pragmatic documentation to keep teams moving.

Quick links

LinkedIn→GitHub→

// Additional experience

Technologies I've used hands-on to implement specific features or support existing systems.

Java / Spring BootPython / Flask / DjangoGraphQLISO-8583EMV / Payment standards

// TRACK RECORD

Experience

Senior Backend / Full-Stack Engineer (Fintech / POS)

Startapps - Kipu

Lima, Peru / Remote
  • Built and owned end-to-end development of the Kipu POS platform supporting sales operations, tipping flows, and device integrations.
  • Designed and implemented a microservices-oriented architecture focused on scalability, security, and high performance for transaction workflows.
  • Delivered payment-capture flows (EMV card payments, QR payments), including tipping logic and device pairing across merchant operations.
  • Implemented and maintained CI/CD pipelines to automate builds, testing, and deployments, improving release reliability and reducing manual production risk.
Node.jsTypeScriptPaymentsMicroservicesCI/CD

CTO / Senior Full-Stack Engineer (Hands-on)

Startapps

Lima, Peru•Apr 2018 - Present
  • Led hands-on development across backend, frontend, and Android for multiple products, ensuring security, quality, and predictable delivery.
  • Established engineering practices (Scrum cadence, peer code reviews, Git workflow) to improve consistency and maintainability.
  • Partnered with DevOps to design and roll out deployment pipelines across development, QA, and production environments.
  • Owned architecture decisions, data modeling, and secure API design for scalable systems across different industries.
ArchitectureSecure APIsLeadershipDeliveryDevOps collaboration

// PROOF

Featured Project

Kipu POS Platform

A fintech/POS platform with transaction management, dashboards, and payment network integrations. Designed for reliability, security, and scalability.

FintechPOSSecurityScale

// NEXT STEP

Contact

marlon@backend-system ~ (zsh)
Backend / Full-stackFintech / PaymentsNode.js / Laravel

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Marlon Laguna. Senior Backend / Full-Stack Engineer.

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I'm currently exploring senior backend and backend-heavy full-stack roles. If you're hiring for systems that require strong correctness, security, and throughput, I can help.

Message on LinkedInEmail me

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