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Alexandre Harano

@alexandreharano

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Senior Full Stack Engineer building scalable fintech and AI-enabled SaaS platforms across remote teams.

Brazil

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What I'm looking for

I’m looking for a remote role where I can modernize fintech/SaaS platforms end-to-end—building secure APIs, microservices, and AI-assisted workflows—while improving performance, reliability, and release quality with cross-functional teams.

I’m a Senior Full Stack Engineer with 10+ years of experience building scalable fintech, SaaS, and AI-enabled platforms across remote international teams. I bring strong expertise in React, TypeScript, Node.js, Python, and modern backend architecture, delivering secure APIs, microservices, and cloud-native applications end-to-end.

Most recently, I re-architected core platform services at Peak using React, TypeScript, Node.js, Python, PostgreSQL, Redis, and Docker—scaling concurrent user capacity from ~10K to 1M+ and reducing API latency by 80%+. I also delivered AI-assisted classification, anomaly review, and decision-support workflows that reduced manual review effort by about 30%, while supporting Pix, boleto, CNAB240/FEBRABAN, and Open Finance payments and reconciliation.

Earlier at Brex, I built and optimized financial workflow services, improving transaction-processing throughput by about 30% and making finance operations workflows easier to support in production. Throughout my career, I’ve focused on building products from the ground up, modernizing underperforming systems, and improving performance, reliability, release quality, and maintainability—while mentoring engineers and partnering across product, design, compliance, and engineering.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Peak

Aug 2021 - Present (4 years 8 months)

Re-architected core platform services to scale concurrent users from ~10K to 1M+ and cut API latency by 80%+ while raising uptime to 99.99%. Delivered AI-assisted classification and decision-support workflows and improved release confidence by reducing rollback/hotfix incidents by ~25%.

React TypeScript Python PostgreSQL Redis Docker CI CD Distributed Systems

Senior Software Engineer

Brex

Apr 2018 - Aug 2021 (3 years 4 months)

Built and optimized financial workflow services, increasing transaction-processing throughput by ~30% and improving release stability by reducing regressions by ~30%. Delivered full-stack features across spend management and internal finance tooling in a remote environment with product and compliance partners.

React TypeScript Python PostgreSQL Redis REST APIs Testing CI CD System Design

Founding Software Engineer

Brex

Jan 2017 - Apr 2018 (1 year 3 months)

Joined early in Brex’s growth and contributed across frontend, backend, and data modeling to build core product foundations. Developed full-stack onboarding, admin tooling, and transaction-support workflows, supporting deployment, debugging, and iterative improvements through the delivery lifecycle.

JavaScript Python API Development Data Modeling Debugging Relational Databases Full Stack

Software Engineer

CloudWalk

Jan 2014 - Dec 2016 (2 years 11 months)

Developed and maintained web application features and backend services for fintech and payment-related operational workflows with high ownership. Built internal tools and transaction support, contributed to API and database workflows, and supported production issues and debugging to improve delivery quality.

Web Application Development Backend Development API Development Workflows Debugging Production Support Fintech Operations Internal Tooling