Renan Spatin / Independent consulting
Juiz de Fora · gmt-3
Build · Architecture & process consulting
I build systems, products and sites end to end, and fix the architecture and processes behind them. From the first decision to delivery in production.
Renan Winter Spatin
Software Engineer · Tech Lead · LL.B.
Find the starting point for your project. Each specialty explains potential applications, scope and how we can work together.
Technology shaped by your operational requirements.
Connect intake, documents and knowledge with automation and human review.
Explore solutionsConnect providers, reconcile records and track operational exceptions.
Explore solutionsConnect clinic intake and administrative workflows with deliberate data access controls.
Explore solutionsWebsites, apps and systems for parishes, dioceses and charities, with care for members' data.
Explore solutionsFrom presenting your offer to building your product.
An outside look at the architecture and processes you already have.
Does your project span more than one area?
Let's find the right approachRecommendations from leaders, peers and people I led, published on LinkedIn.
“I've had the pleasure of working closely with Renan for several years, from our time at BTG Pactual through to Transfero Group, and I can confidently say he is an outstanding professional. Renan is extremely meticulous, methodical, and focused, with a strong commitment to delivering high-quality work. He's someone you can trust in critical situations and complex environments.”
Technical decisions with measurable impact on speed, cost, reliability and compliance - the four most representative.
If useful, leave a trace.
3×
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.
Py → .NET
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.
↓ cost
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.
SDK
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.
Outside company work, I serve communities and associations as a volunteer - it's where technology makes people's lives easier most directly.
I
Volunteer·Communications ministry · Web + Mobile + API · 2024
A Catholic community I belong to, serving in the communications ministry. I built the platform as a volunteer: web, hybrid mobile app and custom backend. Daily liturgy, events, content editor and members area - technology in service of faith and community.
II
Volunteer·Institutional site + admin · 2026
Associação de Apoio à Primeira Infância e Obras Sociais São José (Juiz de Fora, Brazil), a Catholic organization supporting expectant mothers, children and families. I built its institutional site and news admin as a volunteer, helping the team publish content independently and reach more people.
Tools from my own workflow, published for anyone to use.
7+ years of experience
Track record by company, technologies, and responsibilities. Full, printable version on the resume page.
Current
01 / 04
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 leadership. In 3 years: 606 PRs, ~4,700 commits across 72 repositories and 488 production changes - on/off-ramp, custody, compliance and trading. In 2026, architected the new Node/AWS stack (EKS/ECS, Terraform, Helm) and the cross-border settlement product, spec-first with AI agents.
Past role
02 / 04
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.
Past role
03 / 04
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.
Past role
04 / 04
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).
Articles
Software architecture, applied AI and what I learn taking products off paper and keeping them alive in production.
2026-10-05
media-viewer exists so I can watch and download, on my phone, the videos my agents render. It's one file, five dependencies, no database and no client-side JavaScript. This post walks through each decision and what I gave up to make it.
Read ArticleA 30-minute diagnostic, no strings: you describe the bottleneck, I tell you whether and how I'd solve it.
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