Emanuel Frua
Senior Backend & Full-Stack Engineer
I build reliable backend systems and complete digital products for fintech, crypto and B2B companies.
10+ years in backend engineering — mainly Java and Spring Boot, more recently Go — plus full-stack delivery with React, TypeScript, Kafka and AWS.
Based in Buenos Aires · Remote worldwide · European citizenship
What Brings You Here?
Tell me what you’re looking for
Selected Results
Proof that I deliver
24h → 1h
Optimized a banking batch process serving roughly one million users, cutting execution time from about 24 hours to around 1 hour.
30min → 1min
Improved a Brazilian billing process through backend and fiscal-system integrations.
Early engineer
Joined an early-stage crypto exchange and helped establish the technical foundation as the engineering team grew.
End-to-end delivery
Built backend, frontend, infrastructure and production workflows for the same products.
What I Do
Backend-first, full-stack when it counts
Backend Systems & APIs
APIs, microservices, event-driven flows and database design for systems that can’t go down. I own reliability, performance and architecture end-to-end.
Full-Stack Product Development
Complete products, not just the backend. React and TypeScript frontends built on solid, backend-first architecture.
Fintech & Crypto Systems
Trading, transfers, deposits, withdrawals, staking and billing systems for exchanges, wallets and financial platforms.
AI Integrations
I integrate AI capabilities into existing products and workflows without compromising reliability, security or maintainability. My main expertise stays backend and product engineering — AI is a practical capability inside reliable production systems.
Selected Experience
What I’ve built, filterable by domain
Crypto Exchange — Early Engineering
Joined an early-stage cryptocurrency exchange and helped establish its technical foundation as the engineering team grew from about 1 to 10 engineers.
Trading & Transaction Systems
Built systems for trading, transfers, deposits, withdrawals, staking, lending and reporting, using Kafka-based event-driven flows for reliable processing.
Brazilian Billing Integration
Delivered a billing integration connected to Brazilian fiscal systems, reducing processing time from about 30 minutes to roughly 1 minute.
Banking Platform Reliability
Built and supported backend systems for banking platforms with a focus on reliability, including optimizing a batch process for ~1M users from 24h to ~1h.
Business-Critical Integrations
Delivered reporting and business systems for companies and clients such as McDonald’s, AMD, and financial and banking institutions, replacing third-party integrations with internal solutions when it made sense.
Full-Stack Product Delivery
Built React and TypeScript frontends on top of backend-first architecture, including MVPs and internal tools, with end-to-end ownership.
Case Studies
A closer look at three projects
Crypto Exchange Platform
Built transactional and product capabilities for an early-stage digital-asset platform.
Brazilian Billing Integration
Integrated backend services with Brazilian fiscal systems and cut processing time drastically.
Banking Batch Optimization
Optimized a large-scale batch process for a banking platform serving around a million users.
Ways to Work Together
Flexible engagement, senior ownership
Senior Backend Role
Full-time or long-term remote opportunities where I can own critical backend systems and product delivery end-to-end.
Project Development
Backend services, integrations, MVPs, internal tools and complete product features, delivered as a defined project.
Fractional Senior Engineering
Part-time senior engineering support for architecture, implementation and technical decisions — including crypto/exchange and wallet flow reviews.
Technical and product-focused. No financial, legal or tax advice.
About
10+ years close to both the code and the product
I understand the business problem, design a practical solution and take ownership through production delivery.
Most of my career has been backend-focused — mainly Java and Spring Boot — on financial and transactional systems: APIs, integrations, microservices, reliability and scale. I’ve worked with early-stage products and larger financial institutions, and more recently moved into Go and full-stack delivery with React and TypeScript.
Tech Stack
Click a technology to see where I’ve used it.
Backend
Data & Messaging
Frontend
Cloud & Delivery
AI-Enabled Development
Tell me what you’re building
Share a short description of your project, the problem you’re solving and where you need senior engineering support.