Lambda — Lucas Resende Tavares' personal brandLucas R. Tavares

Proof: cases, code and talks

Don't take my word for it: check it. Every item has a date, a result and a link.

Summary in numbers

17

open-source .NET packages

208k+

NuGet downloads

6

articles on data, architecture and AI

7

stages and communities in Brazil and the US (2024–2026)

Cases with numbers

PetraSync · 2018–2019

Deadline: 30 days → 45, delivered in 45

Critical system for a US client with RavenDB as a requirement. I asked for 45 days, rebuilt the architecture as documents and delivered.

Goals-forecast report · Mastertech

≈ 4 h → ≈ 30 s

Rethinking the query strategy turned an overnight report into one that runs in seconds.

Critical stored procedures

4–8 h → 40 s

Logical restructuring with table functions and cursor elimination, without changing the model or adding indexes.

DaaS in the automotive sector

1.8 min → 600 ms

Technical recommendation remodeled on RavenDB with Full-Text Search (timing includes authentication).

Delphi → .NET · Agrotis, 2018

Team trained in ≈ 6 months

Led an entire Delphi team's move to .NET and SAP integration.

Castrol Trocador app · Castrol Brazil, 2024

Android and iOS, announced to all distributors

App contract after LeadSoft's professionalization. I presented the pre-launch at the Castrol Turbo Mode ON event on March 26, 2024, to all Castrol distributors in Brazil.

Open source and demos

  • 17 NuGet packagesCommon libraries, data access, adapters (BrasilAPI, ViaCEP, IBGE, e-mail, AWS, Azure Entra ID, Google, RavenDB Identity).
  • ravendb-demoHands-on RavenDB demo (phase 1 of the selection process).
  • ravendb-sales-assistant-demoAPI that integrates OpenAI (ChatGPT) and stores the conversation history in RavenDB, built to demonstrate the integration quickly (phase 2). I had no idea RavenDB was about to launch AI Agents, and built something similar on my own.
  • TDC 2024 workshopCode from the data modeling workshop.

Videos and talks

RavenDB channel · TDC São PauloNoSQL: a small step in modeling, a giant leap in efficiencyWatch on YouTube →RavenDB & GDG MaringáThe Power of RavenDB — NoSQL, Vector Database, Generative AI and AI AgentsWatch on YouTube →RavenDB channel5 reasons to use RavenDB as THE database of your productWatch on YouTube →My channelRavenDB Playground: test performance without installing anythingWatch on YouTube →

Selection-process interviews

RavenDB vs PostgreSQL, part 1: server setupWatch on YouTube →RavenDB vs PostgreSQL, part 2: bulk insert, full-text search and countersWatch on YouTube →RavenDB vs PostgreSQL, part 3: vector search and AI agent registrationWatch on YouTube →

Recorded and published on my channel. The two repositories above are part of the same process.

Articles

Published on LinkedIn (in Portuguese). LinkedIn

Where I have been

DateEventPlaceRole
2024-02Developer WeekSan Francisco, USAMeeting the RavenDB team
2024-03-26Castrol · Turbo Mode ONMogi das Cruzes, BrazilPre-launch of the Castrol Trocador app, for all Castrol distributors in Brazil
2024-09TDC São PauloSão Paulo, BrazilTalk and workshop on NoSQL and data modeling
2024-10-07FAE · Entrepreneur WeekCuritiba, BrazilTalk O efeito borboleta no empreender (the butterfly effect in entrepreneurship), for students
2025-11Microsoft IgniteSan Francisco, USAFirst trade show on the RavenDB team
2026-05TechEx North AmericaSan Jose, USALive demos at the booth
—GDG MaringáMaringá, BrazilThe Power of RavenDB (video)

Who has trusted me

RavenDB client: Invent Software

I talked to Fábio Nascimento, CTO of Invent Software, whose clients include Ambev and major football clubs, about how the company redesigned its data strategy with RavenDB. Numbers reported by him in the interview and published in my April 23, 2026 article (in Portuguese), about an operation that, according to the article, moves 4% of Brazil's GDP.

80%gain in development and maintenance time
38 mirecords in a retroactive REINF load, in 10 hours (RavenDB with Kafka)
15–20%CPU usage during that load
20–30related tables for one NF-e (invoice) in the previous SQL model

Read the articleFull interview on video (in Portuguese): Caso de sucesso: como a Invent Software alcançou 80% de agilidade técnica com o RavenDB.

Success story: how Invent Software achieved 80% technical agility with RavenDB (video, in Portuguese)

What LeadSoft clients said

Testimonials received by LeadSoft between 2018 and 2025, in the words of the people who hired us. They show delivery, deadlines and partnership; LeadSoft is the company I founded and led before joining RavenDB. Translated from Portuguese; the original is one click away.

The great challenge of technology companies is discipline and processes! With the Cooperation Agreement signed with Leadsoft®, our company was able to implement modern production processes, greatly raising our control capacity and delivering greater speed and performance. That is why we can say that Leadsoft® is among the "Top Five" Partners of the Inforlube Group.

Original in Portuguese

O grande desafio das empresas de tecnologia é a disciplina e os processos! Com o Acordo de Cooperação celebrado com a Leadsoft® nossa empresa conseguiu implantar modernos processos de produção, elevando muito nossa capacidade de controle gerando maior rapidez e performance. Por isso, podemos afirmar que a Leadsoft® figura entre os Parceiros "Top Five" do Grupo Inforlube.

Remo LucioliFounder and Data Engineering Director, Inforlube GroupTranslated from Portuguese

We were looking for partners who could give us agility and technical and commercial knowledge for our software and our customers, and we found much more in the LeadSoft® team! Together, we exceeded our improvement goals within the planned deadlines, thanks to the high availability and selfless dedication to the project. Today, the partnership has secured the high satisfaction of our most significant customers, raising our brand more every day. Thank you, Lead team!

Original in Portuguese

Nós buscávamos parceiros que nos fornecesse agilidade, conhecimento técnico e comercial para nossos softwares e nossos clientes e, encontramos no time LeadSoft® muito mais! Juntos, superamos nossas metas de aperfeiçoamento dentro do prazos planejados, graças a alta disponibilidade e dedicação desprendida no projeto. Hoje, a parceria nos garantiu a alta satisfação dos nossos clientes mais significativos, elevando cada dia mais a nossa marca. Obrigado time Lead!

Ricardo BraidotteCo-founder, R3 Engenharia, and Project Manager at InforlubeTranslated from Portuguese

LeadSoft® was an important acquisition for our company. Always with excellence in product quality and in teamwork performance. Qualified professionals and excellent service, promoting the satisfaction of its customers.

Original in Portuguese

A LeadSoft® foi uma aquisição importante para nossa empresa. Sempre com excelência na qualidade do produto e no desempenho do trabalho em equipe. Profissionais qualificados e atendimento excelente promovendo a satisfação dos seus clientes.

Sandra BaroniProcess Manager, LeadmecTranslated from Portuguese

Stopping by to thank the whole LeadSoft® team for the effort in handling my platform's demands. Today I see how essential having developer support was for the growth and stability of my company. I will certainly keep recommending your work a lot!

Original in Portuguese

Passando aqui para agradecer pelo empenho de toda a equipe da LeadSoft® no atendimento das demandas da minha plataforma. Hoje vejo o quanto ter um suporte de desenvolvedores foi fundamental para o crescimento e a estabilidade da minha empresa. Com certeza vou continuar recomendando muito o trabalho de vocês!

Professor Ari"O Brabo da Redação" (writing instructor), Minha DiscursivaTranslated from Portuguese

Want to talk about your RavenDB case?

EvaluationI want to evaluate RavenDB for my projectOpen WhatsAppProof of conceptI want a POC with my own dataOpen WhatsAppArchitectureDiscuss architecture and modeling with RavenDBOpen WhatsApp

Prefer e-mail? Write to lucas.tavares@ravendb.net