Marketplace payment platforms
Technical lead of Adyen and Mirakl connector work: sellers, payments, commissions, invoices and financial synchronization across marketplace platforms.
Solution Architect · Tech Lead
Backend leadership for payment-heavy platforms.
I'm Alfredo Caloto. I work where backend architecture, payment operations, marketplace complexity and client delivery need one accountable technical owner.
Adyen & Mirakl marketplaces 3× Stripe-certified AWS · Java · Node · Python
Current role
Tech Lead, Marketplace Payments Platform
Certified
3× Stripe Architect — Associate, Implementation & Billing
Domain
Adyen, Mirakl, Stripe, SAP Commerce
Expertise
Fintech delivery with architectural ownership.
Payments is where correctness, reliability and commercial pressure meet. That intersection is my working territory.
Stripe architecture
Three Stripe architect certifications — Associate, Implementation and Billing Architect — supporting companies on payment architecture and integrations.
Backend and cloud engineering
Node.js, Java, Python, Spring Boot, GraphQL and microservices on AWS Lambda, SQS, PostgreSQL, MySQL and MongoDB — event-driven backend systems.
Teams, RFCs and clients
Architecture decisions, development team coordination, international stakeholders, technical proposals and RFC analysis for new clients.
Delivery
Hands-on enough to build. Senior enough to lead.
At Seidor I work as Tech Lead on marketplace payment platforms, making architecture and reliability decisions for distributed backend systems built with AWS Lambda, SQS and PostgreSQL.
Before that: Adyen integrations, SAP Commerce automotive marketplace work, Mirakl marketplace integrations and Capgemini/Inditex microservice migrations with Java, Spring Boot, Kafka, MongoDB and IBM MQ.
-
Clear ownership Technical direction, tradeoffs, RFCs and stakeholder alignment without hiding behind process.
-
Backend depth Event-driven services, financial workflows and large operational datasets, hands-on.
-
Client fluency Architecture translated into implementation plans clients and teams can actually execute.
Own products
Independent apps, built with taste and restraint.
Two live apps on the App Store and Google Play — each with its own brand, designed and engineered end to end.
SpendFlex
Private budget & expense trackerControl your money. Your way.
A private, offline-first expense tracker and budget planner — budgets, savings goals, insights and reports, with no bank login and nothing leaving your device.
PartyKit
13 party games in one appPass the phone. Start the party.
Thirteen pass-and-play party games — secret roles, drawing chaos, rapid-fire trivia. Fully offline, English & Spanish, no accounts.
Contact
One accountable technical owner.
Payment platforms, marketplace integrations, backend architecture — if it has to work in production, let's talk.