Anca Zamfir - Principal Engineer at Circle

Anca Zamfir

Principal Engineer at Circle

Lausanne, Vaud, Switzerland

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Summary

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Rockstar

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Top School

Anca Zamfir is an experienced software engineering leader with 11 years in distributed systems and over two decades of hands-on protocol and application development, currently directing engineering at Informal Systems while contributing to Interchain Foundation and Circle. She combines deep networking protocol expertise (MPLS-TE, RSVP, OSPF/ISIS, L2VPN) with modern systems programming in Rust, Go, C/C++ and Python, and applied data skills from Udacity nanodegrees. Anca has made notable open-source contributions to high-profile blockchain projects—helping implement IBC relayers in Rust and refining Tendermint consensus validator logic—bridging low-level consensus mechanics and practical relayer tooling. Her background spans research and product environments from RUAG defence R&D to Cisco, where she led protocol design and IPv6/medianet initiatives, giving her rare cross-domain fluency. She’s pragmatic about shipping robust, tested systems and often improves infrastructure quality (tests, CodeCov, CI) as part of feature work. Based in Lausanne, she pairs academic roots in computer engineering with a curiosity for data analysis and standardization that informs her system designs.

11 years of coding experience

32 years of employment as a software developer

Master of Science (M.Sc.), Computer Engineering, Master of Science (M.Sc.), Computer Engineering at Politechnic Institute of Bucharest, Computer Engineering, Romania

Artificial Intelligence Nanodegree and Specializations, Artificial Intelligence Nanodegree and Specializations at Udacity

English, French, Romanian

Github Skills (13)

command-line-interface10

consensus10

distributed-systems10

bft-protocols10

go10

rust10

blockchain10

cli10

command-line10

cryptography9

testing9

configuration-management9

cosmos-sdk9

Programming languages (5)

RustTeXGoPythonBluespec

Github contributions (5)

informalsystems/hermes

Feb 2020 - Jan 2023

IBC Relayer in Rust

Role in this project:

Back-end Developer

Contributions:3 releases, 671 reviews, 202 commits in 2 years 11 months

Contributions summary:Anca contributed to the core implementation of the IBC relayer in Rust. Their work included defining the basic directory structure and template files, implementing client queries, and setting up CodeCov and other testing infrastructure. They were also responsible for adapting and refining the configuration files and adding support for channel handshake messages. The user demonstrated expertise in Rust and familiarity with blockchain technologies like IBC.

rustcosmosibcblockchaintendermint

tendermint/tendermint

Feb 2019 - Nov 2022

⟁ Tendermint Core (BFT Consensus) in Go

Role in this project:

Back-end Developer

Contributions:34 reviews, 58 commits, 23 PRs in 3 years 9 months

Contributions summary:Anca primarily focused on core back-end development within the Tendermint Core codebase. Their contributions involved implementing and refining validator set logic, including updates, removals, and priority management. They fixed bugs related to the handling of empty validator sets and preventing spurious overflow warnings, while also adding tests for edge cases. Their work demonstrates a deep understanding of the consensus mechanisms within Tendermint.

consensusgotendermintbftdistributed-systems

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