Technology Strategist · AI-First Architect · Bachelor of Laws
Renan W. Spatin
Solving systemic efficiency problems through AI-first systems and high-scale engineering. Regardless of the domain-be it Law, Medicine, Finance, or Engineering-I build solutions that scale.
I build intelligent systems for high-stakes industries where precision and speed are the ultimate multipliers.
Identity & Principles
My approach is defined by the intersection of three distinct worlds: the precision of Law, the resilience of Engineering, and the discipline of Martial Arts.
Engineering & Law
Systems governed by logic. I apply legal structural thinking to distributed architecture, building software that is as robust as a well-drafted contract.
Discipline & Vigor
The mat and the keyboard are one. As a BJJ blue belt, I bring the stoic persistence and physical discipline of the martial arts to technical leadership.
Faith & Purpose
Driven by transcendent values. My Roman Catholic faith provides the moral compass and the 'why' behind every strategic decision I make.
Engineering that ships - not slides.
- 7+
- Years shipping production software
- 3×
- Integration velocity delivered (Transfero)
- 3
- Top financial institutions (Transfero · BTG · Thomson Reuters)
- PT·EN
- Fluent in two languages
Outcomes that shipped.
Five technical decisions with measurable impact on velocity, cost, reliability, and compliance.
3×
Integration delivery velocity
Transfero · 2023 →
Designed a Microkernel architecture for external-integration adapters and built a Visual Studio template that scaffolds the full library structure. Tripled delivery speed for new adapters and became the team standard.
Trade-offAccepted more complexity in the core - an extensible kernel costs more to maintain - in exchange for linear adapter delivery. Worth it because integrations were the team's growth vector.
- C# / .NET 7
- Microkernel
- Clean Architecture
- Visual Studio
Py → .NET
Critical migration from Python to .NET 7
Transfero · 2023 →
Rewrote a critical integration from Python to .NET 7. Performance gains, higher reliability, and alignment with the company's core stack - fewer incidents on critical financial operations.
Trade-offAccepted the cost of rewriting battle-tested code in exchange for consolidating the stack in a single language - smaller oncall surface, one CI/CD pipeline, unified observability.
- Python
- .NET 7
- Performance
- Reliability
↓ cost
Centralized pricing service
Transfero · 2023 →
Built a centralized service that aggregates external pricing data and serves every internal application. Eliminated redundant calls, standardized the source of truth, and cut company-wide operational cost at scale.
Trade-offAccepted a single point of failure in exchange for consistency and cost. Covered with aggressive Redis caching, clear SLOs, and graceful degradation when the upstream goes down.
- C# / .NET
- Redis
- Azure
- Distributed Cache
SDK
SDK + template that accelerated the payments team
Transfero / BTG Pactual · 2022 →
Built an SDK and a Visual Studio template that scaffold the base project for payment adapters. Other teams now focus only on the integration itself - time per adapter fell from weeks to days, with quality consistent by design.
Trade-offSDKs demand semantic versioning discipline and an API surface that ages well. I took on that responsibility to remove cognitive load from consumer teams - they no longer need to know the plumbing.
- C# / .NET
- SDK design
- Visual Studio
- DX
7 days
Regulatory delivery under pressure
Financial system · delivered in one week
A project with tight regulatory requirements delivered end-to-end in seven days. Prevented significant operational losses and kept the company compliant with the regulator.
Trade-offKnowingly accepted tech debt - minimal coverage, deferred refactor - in exchange for a non-negotiable deadline. Follow-up plan written on delivery day; debt cleared in the two sprints that followed.
- High-pressure delivery
- Compliance
- Execution
Manifesto & Insights
Strategic reflections on technology, philosophy, and the disciplined life.
Technology is the canvas, but discipline is the brush. Without principles, engineering is just noise.
Independent projects.
Beyond my work at companies, I also build and operate products of my own. Three live in production right now.
I
comexaltai.com ↗Lead engineer · Web + Mobile + API · 2024
Comunidade Católica Exaltai.
comexaltai.com
Catholic community platform with web, hybrid mobile app, and custom .NET backend. Daily liturgy, events, content editor, and members area.
- 01ASP.NET Core 9 backend in Clean Architecture with Entity Framework Core 9 over PostgreSQL 16 and JWT authentication.
- 02React 19 + Vite web and hybrid mobile via Capacitor, sharing the same API - one code base, three surfaces.
- 03TipTap editor and liturgical calendar wired so the editorial team publishes content without needing engineering.
II
agapeon.io ↗Technical co-founder · Solo engineer · 2024
Agapeon.
agapeon.io
SaaS product with web, mobile app, custom .NET backend, Stripe billing, and applied AI. Built and operated solo, from zero to production.
- 01ASP.NET Core 9 + EF Core + PostgreSQL + Serilog on the backend; React 19 + Vite + Supabase SDK on the web; hybrid mobile via Capacitor.
- 02Stripe for recurring billing, Resend for transactional email, and Google GenAI for in-product AI features.
- 03Infra on Heroku (API) + Cloudflare Pages (web), Docker Compose locally - continuous delivery without a DevOps team.
III
gokai.ong ↗Full-stack engineering · Solo engineer · 2024
Gokai.
gokai.ong
Social-impact platform built as a serverless Next.js app on Supabase. No custom backend - lean architecture by design.
- 01Next.js 16 (App Router) with Supabase SSR for auth and managed Postgres - no server of my own to operate.
- 02Forms with React Hook Form + Zod, fully typed end-to-end; UI with shadcn/ui on Tailwind v4.
- 03Deployed on Vercel, no Docker or custom pipeline - simplicity as a competitive advantage for a non-profit.
Track record.
7+ years of experience
Track record by company, technologies, and responsibilities. The full, official version lives on LinkedIn.
Current
01 / 07
Technical Lead · Software Engineer
Transfero · Remote
Technical leadership of a 3-engineer team, reporting directly to the CTO and Director. Architecture of new backends, team technical standards, engineering reviews, and technical strategy alongside company leadership.
- C# / .NET
- Distributed Systems
- Azure
- Kubernetes
- Engineering Leadership
- Architecture
Past role
02 / 07
Senior Software Engineer · Contract
Lumon Pay · United Kingdom (Remote)
Heavy back-end projects for a UK-based fintech. Mission-critical C# / .NET services on Azure, with focus on reliability, financial integrations, and performance under real load.
- C# / .NET
- Azure
- Backend
- Distributed Systems
- Fintech
Past role
03 / 07
Software Engineering Specialist
Transfero · Brazil
Architected and built financial integration services at scale. Designed the Microkernel architecture that 3×'d adapter delivery velocity, migrated a critical integration from Python to .NET 7, and built a centralized pricing service that cut company-wide operational cost.
- C# / .NET 7/8
- Azure Service Bus
- PostgreSQL
- SQL Server
- CosmosDB
- Redis
- Kubernetes
- Microkernel
- Clean Architecture
Past role
04 / 07
Technical Lead · Offshore Onboarding
BTG Pactual · Brazil
Technical leadership of 5 devs + QA on the Offshore Onboarding squad at Latin America's largest investment bank. Pershing integration for automated document upload and workflow for offshore PJ account creation (US and Cayman).
- C# / .NET 5/6
- RabbitMQ
- AWS SQS/SNS
- DynamoDB
- PostgreSQL
- Kubernetes
- Microservices
Past role
05 / 07
Technical Project Lead · Offshore Onboarding
BTG Pactual · Brazil
Built automated workflows for US and Cayman offshore onboarding, extracted responsibilities from the legacy core system into a .NET 6 microservice with PostgreSQL. Recognized as Top Professional (Far Exceed - top 30% of the company).
- C# / .NET 6
- RabbitMQ
- AWS
- PostgreSQL
- Microservices
- Workflow Automation
Past role
06 / 07
Senior Software Engineer · Contract
BTG Pactual · Brazil
Rewrote the legacy documents page of the onboarding system from Angular.js to React; migrated a critical API from .NET Core 2.2 to .NET 5 for performance gains; built a library to fix IHttpClientFactory socket starvation across production apps.
- C# / .NET 5
- .NET Core 3.1
- React
- RabbitMQ
- MySQL
- Kubernetes
Past role
07 / 07
Software Engineer · Intern → Junior → Engineer
Thomson Reuters Brasil · DataCloud
Grew from intern to Software Engineer on the DataCloud team (legal tech). On-prem → Azure migration for cost and performance, AI project for captcha recognition, regex + Elasticsearch classification, and a Levenshtein-based system that prevented legal-process movement duplication. Recognized as Top Professional.
- C# / .NET
- Azure
- SQL Server
- Elasticsearch
- Legal Tech
- Applied AI
Visual Narrative
Life beyond the screen: from photography to the daily discipline.
Strategic Partnership.
For systems that scale and operations that think. Reach out for consulting or follow for daily insights.
Insights on @rwspatin