More than a year after the first Bitcoin Dev Launchpad cohort, its outcomes are becoming easier to evaluate. The Bitcoin Dev Launchpad is Vinteum’s intensive training program for developers seeking to deepen their technical understanding of Bitcoin and find a path into open-source contribution.
Participants entered with very different levels of technical experience and progressed at very different speeds. Some already had software engineering or open-source backgrounds; others arrived with little understanding of Bitcoin’s technical foundations. Some moved quickly into full-time open-source work, while others needed more time to study, find the right project, or create the conditions to make that commitment.
Several participants moved relatively directly from BDL into funded work. Lucas Balieiro, Moisés Pompílio, João Leal, and Guilherme Martins are now supported by OpenSats, while Luis Schwab received a grant from the BDK Foundation. Erick Cestari and ThgO.O became Vinteum grantees. Others transitioned into professional engineering roles: Caio joined Boltz, Gustavo Stingelin joined Lightning Labs, and Lang joined Tether to work on QVAC.
Other trajectories were less direct. Joãozinho, who had just finished high school, continued studying and contributing from Casa21 before finding his place in the Krux ecosystem and independently securing an OpenSats grant. TheMhV later entered Vinteum’s fellowship program and is now contributing to Cashu Dev Kit while deepening his expertise in cryptography. João Vitor Senna, who did not reach the BDL1 residency, was later hired by Synonym and continues developing Mandacaru in his spare time. Ingrid Gama remained active in the community and recently won Hack4Freedom with Satra Wallet, while Raphael Dutenkefer has begun exploring how his data-science background could contribute to Bitcoin privacy and network research alongside his other professional commitments.
These different outcomes reinforce two important conclusions for Vinteum. First, there is no single timeline into Bitcoin open source. An early outcome is not necessarily a final one, and the BDL itself should not become a prerequisite for contribution. People can enter through BitDevs, Casa21, Summer of Bitcoin, university activities, Discord, independent contributions, or direct relationships with projects.
Second, the decisions of independent organizations to fund or hire contributors who passed through Vinteum’s programs provide an important form of external validation. They show that the skills, judgment, and technical experience developed along these paths are recognized beyond Vinteum itself.
Vinteum’s role is not to own or gatekeep a pipeline, but to make different paths easier by providing technical context, mentorship, funding, introductions, and a community where contributors can learn from one another. The goal is to strengthen an ecosystem capable of discovering, developing and supporting contributors regardless of where their path begins.
Gustavo Stingelin
The BDL opened my eyes to the possibility of building a career by contributing directly to open-source Bitcoin projects. Since I already had experience as a software engineer working with Go, I began looking for ways to apply those skills within the ecosystem.
During the program, I became interested in Lightning and started making small contributions to LND. Lucas connected me with Roasbeef, who shared a list of priority tasks. One of them matched my experience: migrating btcwallet from a key-value database to SQL, with support for SQLite and PostgreSQL. I began working on the migration in August 2025 and continue contributing to it today.
I initially balanced this work with my full-time job, but later left my position to focus on open source and began a Vinteum fellowship. In February 2026, I returned for BDL2 as an alumnus, helping newer participants find contribution opportunities.
In July 2026, I joined Lightning Labs, where I now contribute to Loop while continuing my work on btcwallet. For me, this opportunity consolidated the professional path that the BDL first helped me see.
Lucas Balieiro
My open-source journey began with Vinteum’s Bitcoin Dev Launchpad, which became my gateway into the Bitcoin ecosystem and, looking back, felt almost like Disneyland to me. After the program, I was selected for a fellowship and began contributing directly to the Stratum V2 Reference Implementation.
I am now an OpenSats grantee and contribute across several areas of the Stratum V2 ecosystem. My work includes expanding fuzz-testing coverage, fixing bugs, developing tools for the solo mining community such as sv2-ui, and building interoperability and compliance infrastructure through interoperability-tests-sv2.
A significant part of my work also involves reviews, testing, and technical reports. These activities are less visible than new features, but they help identify unexpected behavior, prevent regressions, and improve the quality of the project.
The past year has been, by far, the period in which I have learned the most throughout my career. Working alongside talented contributors and helping strengthen Bitcoin mining infrastructure remains my main motivation to continue on this path.
Luis Schwab
I entered the Bitcoin development ecosystem through Summer of Bitcoin, contributing to Bitcoin Dev Kit, and later joined the first BDL cohort. I then received a Vinteum Fellowship to work on bdk-floresta, integrating BDK with Floresta to create a minimal, private, fully validating Bitcoin client.
After the fellowship, I received a grant from the Bitcoin Dev Kit Foundation to continue working on bdk-floresta, Floresta, and Utreexo. I also maintain BDK’s Esplora and Electrum clients and contribute to the broader rust-bitcoin ecosystem.
Outside of development, I help organize Brasília BitDevs and have served as a teaching assistant for Professor Edil’s Bitcoin courses at the Universidade de Brasília.
Caio
Vinteum’s Bitcoin Dev Launchpad provided the foundation for my transition into Bitcoin engineering. During the program, I began contributing to Boltz and went on to spend 19 months working on its non-custodial atomic swap client.
My work covered the full swap lifecycle, including hardware-wallet compatibility, mobile support, client-side verification, and failure recovery. I also built a Rust-based rescue tool that allows users who lose their local swap data to recover the information needed to claim or refund their sats.
Alongside development, I worked directly with users through support and bug reports, which helped surface problems that were difficult to anticipate through testing alone. Overall, my work focused on making atomic swaps more reliable under both normal and failure conditions.
Moisés Pompílio
I joined the BDL because I wanted to understand how Bitcoin works beyond theory. The program pushed me to study more deeply and gave me the foundation to begin contributing to open source.
After the BDL, I joined the Vinteum fellowship and began contributing to LDK-node, where I worked primarily on testing and interoperability across Lightning implementations. The experience also taught me how collaborative open-source development works, from code review to communication with other contributors.
I later moved to Floresta, where I continue contributing today. My work began around testing but has expanded into RPCs, the Electrum server, wallet functionality, reviews, and technical discussions around the project’s architecture.
Today, I am part of Floresta’s contributor group, funded by OpenSats, and continue developing a broader understanding of the project while contributing to its reliability and functionality.
Joãozinho
BDL was one of the most challenging and enriching learning experiences of my life. It was through the program that I became certain I wanted to pursue a career as a Bitcoin developer.
After the program, I was invited to live at Casa21 while continuing my studies. I had just finished high school, so I spent much of the following year studying, reading code, experimenting with different projects, and looking for a place where I could become more deeply involved.
I eventually found that path in the Krux ecosystem. At the end of 2025, I applied for an OpenSats grant to continue contributing and was approved.
Around the same time, I was accepted into 42 School. For me, 42 is an opportunity to strengthen the computer science foundations behind the programming knowledge I initially developed on my own, while staying closely connected to Bitcoin open source through Casa21 and Krux. It also creates a new bridge between the 42 community and the developer ecosystem around Vinteum, giving me the opportunity to bring more students into technical activities, BitDevs, and Casa21 itself.
Guilherme Martins
I’m Guilherme, also known as qlrd, and I entered the BDL program already contributing to Bitcoin open source through Krux Installer, a project I created and continue to maintain.
The program pushed me beyond my comfort zone and gave me the foundation to go deeper into the stack. That led me to Floresta, where I worked on testing and reliability, including improvements to its functional test infrastructure and RPC compatibility with Bitcoin Core.
I later brought that same focus on testing and code quality back to Krux, contributing across project infrastructure, CI, hardware support, and wallet functionality.
Today, I am an OpenSats grantee focused on expanding Krux’s test coverage and strengthening the project’s overall code quality. My path has increasingly centered on making open-source Bitcoin software more reliable, maintainable, and safer for the people who depend on it.
Luca0x46
I wanted to move into Bitcoin open source, but I did not yet know how to make that transition and still had significant gaps in my computer science background. The BDL program gave me a clearer vision and a foundation I could continue building on.
After the program, I continued contributing to Floresta while using my fellowship to deliberately strengthen those foundations. Some of my assignments involved implementing protocols such as SMTP and IMAP from scratch, helping me develop a deeper understanding of networking, systems, and software design.
I later joined Second as a QA Engineer, where I now lead automated testing across its infrastructure, including Bark, the Bark SDK, and first-party applications. My work includes building specialized testing harnesses and fuzzing infrastructure, applying the foundational knowledge and skills developed during the BDL program and fellowship to improve the reliability of production Bitcoin infrastructure.
João Leal
In early 2024, I attended the first BitDevs São Paulo meetup at Casa21. At the time, I barely understood what a blockchain was, but I kept coming back and eventually learned about Summer of Bitcoin through the community.
I was selected to contribute to Floresta under Davidson Souza’s mentorship, implementing consensus rules and learning how to work inside an unfamiliar open-source codebase. After the internship, I joined Vinteum’s fellowship program and later participated in the first BDL cohort, which gave me a stronger theoretical foundation for the work I was already doing in practice.
After more than a year as a fellow, Lucas encouraged me to apply for a grant. I did not feel ready, but I trusted his judgment, worked on the proposal with his guidance, and it was approved by OpenSats.
My grant focuses on Floresta’s RPC compatibility layer, making it easier for existing applications to use Floresta as a backend. I also built floresta-nix and contributed Android support to rust-bitcoinkernel.
Two years after joining Summer of Bitcoin as a beginner, I now mentor a Summer of Bitcoin student myself. I also recently renewed my OpenSats grant for another year.
Erick Cestari
BDL was a turning point in my career. Before the program, open-source Bitcoin projects felt distant and out of reach, and I knew nothing about how Bitcoin worked technically. I didn’t even know what fuzzing was. Today, it is the core tool behind the main projects I work on: bitcoinfuzz and Smite.
Working through the program’s challenges gave me a solid understanding of how Bitcoin actually works, while the in-person stage added something the technical material couldn’t. Meeting developers who had faced the same difficulties and shared the same enthusiasm created connections that lasted well beyond the program.
During BDL, Bruno Garcia gave a talk about fuzzing and how he started bitcoinfuzz. At the time, the project didn’t support differential fuzzing for the Lightning Network, so that’s where I began contributing. Matt Morehouse then started reviewing and helping with my LN-related PRs. bitcoinfuzz feeds the same inputs to different implementations and compares their outputs, so disagreements can surface potential bugs or consensus discrepancies.
After the program, I was selected for a Vinteum fellowship, where I continued working on Bitcoinfuzz with dedicated mentorship, and later worked as a security engineer at Lightning Labs. I am now a Vinteum grantee focused on the security of Bitcoin and the Lightning Network. My work has included several responsible disclosures and participation in Lightning specification discussions.
Lang
I was previously working in a solid corporate role, but I felt stuck. I knew that freedom tech was what I really wanted to work on, especially Bitcoin, but I did not know how to make that transition. I wanted to contribute to open-source projects, but I lacked both the specialized technical knowledge and the connections to find a path into the ecosystem.
That changed when I found BDL. The program gave me hands-on experience with Bitcoin development while helping me understand how open-source contribution actually works and where my existing engineering background could be useful.
Vinteum also supported me beyond the technical side, helping me think through the transition and connecting me with people and opportunities in the ecosystem. During that process, I was able to move into a new role aligned with the kind of work I wanted to pursue.
For me, BDL helped bridge the gap between an established corporate career and the work I actually wanted to be doing. It gave me the technical foundation, confidence, and relationships I needed to start building in Bitcoin and the broader freedom-tech space.
TheMhv
I remember my first BitDevs at Satsconf. I was surrounded by brilliant developers discussing things I could barely understand, and I remember thinking, ‘I want to be like them.’
Vinteum, and especially the BDL program, helped me work toward that goal. BDL has been the most important development program I have participated in. It helped me understand the Bitcoin protocol in depth while giving me the opportunity to explore other layers and protocols, wallets, cryptography, and many different parts of the Bitcoin development stack. Most importantly, it gave me the confidence and knowledge to start contributing to Bitcoin projects.
At first, I did not have a specific project in mind. I became more involved in the Vinteum community, helping with seminars, events, and other activities. I later returned for BDL2, this time helping review participant submissions and answer their questions.
Today, Vinteum continues to support my next steps through a fellowship. I am contributing to the Cashu Development Kit while deepening my knowledge of applied cryptography through Vinteum’s study group.
thgO.O
Before joining the first BDL cohort, I already had professional experience as a software engineer, but I knew almost nothing about Bitcoin open source as a career. Working professionally on Bitcoin projects felt distant and almost unreachable. The BDL changed that perspective by showing me how the ecosystem worked and giving me the technical foundation, mentorship, and community to take my first concrete steps.
After the program, I became a Vinteum Fellow and focused my work on BTCPay Server. I initially contributed to Plugin Builder and gradually took on more responsibility within the project. That path eventually led me to become a BTCPay Server core developer and the maintainer of Plugin Builder. Today, I am supported through a grant from Vinteum in collaboration with the BTCPay Server Foundation.
My work has expanded from improving the plugin ecosystem to developing a guided multisignature wallet setup, granular wallet permissions, and integrations with projects such as Floresta and different Lightning implementations.
The BDL did more than teach me Bitcoin’s technical foundations. It showed me that contributing to open source could become a real professional path and connected me with the people and projects that made that transition possible.
These trajectories are still unfolding. Some participants moved quickly into grants or full-time roles, while others took longer routes through study, independent contribution, community work, or different parts of the freedom-tech ecosystem. That is precisely the point: the goal of the BDL is not to produce a single outcome, but to give developers the technical foundations, relationships, and opportunities they need to find a path of their own.