Renan Winter Spatin
Senior Software Engineer · Tech Lead
7+ years shipping distributed financial systems, high-scale platforms, and resilient architectures on .NET, Azure, and AWS. Currently Technical Lead and Software Engineer at Transfero. Previously BTG Pactual and Thomson Reuters.
In plain terms: I'm the engineer behind financial systems that can't go down.
- Brasil · GMT-3
- ·
- PT · EN
- ·
- Desde 2018
- ·
- Distributed Systems · .NET · Leadership
—·São Paulo · in production
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
Track record.
Timeline by company. The full, official version lives on LinkedIn.
Nov 2025 — present
01 / 06
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
May 2023 — Nov 2025
02 / 06
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
Jan 2023 — May 2023
03 / 06
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
Jan 2022 — Dec 2022
04 / 06
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 2022 (Far Exceed — top 30% of the company).
- C# / .NET 6
- RabbitMQ
- AWS
- PostgreSQL
- Microservices
- Workflow Automation
Mar 2021 — Dec 2021
05 / 06
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
Jan 2018 — Mar 2021
06 / 06
Software Engineer · Intern → Junior → Engineer
Thomson Reuters Brasil · DataCloud
Grew from intern to Software Engineer in 3 years 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. Top Professional in 2019 and 2020.
- C# / .NET
- Azure
- SQL Server
- Elasticsearch
- Legal Tech
- Applied AI
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.
About Renan
“Senior Software Engineer and Tech Lead with 7+ years building high-scale distributed systems on .NET and cloud.”
Currently Technical Lead and Software Engineer at Transfero, leading a team of 3 engineers responsible for exchange and financial-platform integration services.
Previously Tech Lead at BTG Pactual (Offshore Onboarding) and Software Engineer at Thomson Reuters (DataCloud · legal tech), shipping on .NET, Azure, AWS, Kafka/RabbitMQ, and PostgreSQL.
Stack.
Technologies I use in production. .NET and cloud at the core; pragmatic on the rest.
Backend & APIs
Production services in C#/.NET, event-driven architecture, clean domain.
- C# / .NET (5–9)
- ASP.NET Core
- Python
- Entity Framework Core
- Dapper
- REST
- gRPC
- Microservices
- Microkernel · adapters
- Clean Architecture
- Hexagonal Architecture
- DDD
- Event-Driven
- FluentValidation
- Serilog · structured logs
- Swagger / OpenAPI
Frontend & Mobile
Type-safe, fast, and hybrid mobile when it makes sense.
- React 19
- Next.js 16
- TypeScript
- Vite
- Tailwind CSS
- shadcn/ui
- Radix UI
- TanStack Query
- Zustand
- React Hook Form
- Zod
- Capacitor · hybrid mobile
Data & Infra
Multi-database, multi-cloud, container-first, real observability.
- Azure
- AWS
- Azure DevOps · CI/CD
- Kubernetes
- Docker
- PostgreSQL
- SQL Server
- MySQL
- CosmosDB
- DynamoDB
- Redis · cache + rate limit
- Elasticsearch · text search
- Azure Key Vault · secrets
- New Relic · observability
Messaging & Integrations
Kafka/RabbitMQ, payments, transactional email, and applied AI.
- Kafka · event streams
- RabbitMQ · workflows
- Azure Service Bus
- AWS SQS / SNS
- Stripe · billing
- Resend
- MailKit
- Google GenAI
- Claude
- Codex
Get in touch.
For engineering, architecture, and distributed-systems conversations.