Sandra Vrtikapa

Old Toronto, Ontario, Canada

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Summary

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Sandra Vrtikapa is a results-driven senior software engineer with two decades of experience building secure, high-performance identity, verifiable credential, and financial systems. She specializes in Go and Java ecosystems, microservices, decentralized identifiers (DID), SD-JWT/Selective Disclosure, and blockchain tooling, and has driven production-grade integrations using Kafka, OAuth/OpenID, and cloud-native technologies. At SecureKey she led the design of a Sidetree-based DID network, introduced anchoring and Trillian log monitoring, and implemented selective disclosure and event routing at scale. An active open-source contributor, Sandra has made notable backend contributions to Hyperledger Fabric SDK Go and the Aries Framework Go—adding chaincode querying, DID document features, and SD-JWT support. Known for translating complex cryptographic protocols into pragmatic engineering solutions, she combines deep systems knowledge with a track record of shipping auditable, production-ready identity infrastructure.

9 years of coding experience

21 years of employment as a software developer

Bachelor of Science - BS, Mathematics and Computer Science, Bachelor of Science - BS, Mathematics and Computer Science at University of Toronto

Github Skills (8)

distributed-ledger10

go10

hyperledger-fabric10

verifiable-credentials10

jsonwebtoken10

blockchain10

jwt10

distributed-ledger-technology10

Programming languages (8)

JavaDockerfileShellCSSMakefileGoHTMLPython

Github contributions (5)

hyperledger/fabric-sdk-go

Mar 2017 - Aug 2018

Role in this project:

Back-end Developer

Contributions:1 review, 66 commits in 1 year 5 months

Contributions summary:Sandra Vrtikapa primarily contributed to the Hyperledger Fabric SDK for Go. Her work focused on enhancing the SDK's capabilities, including adding support for querying smart contracts, Ledger Chaincode (LCCC), and System Chaincode (SCCC). She implemented new methods for querying and managing chaincode data, including functions to query installed and instantiated chaincodes, channels, and general ledger information. Additionally, she worked on integrating chaincode events to retrieve and react to on-chain events.

distributed-ledgerhyperledgerblockchainhyperledger-fabricgo

hyperledger-aries/aries-framework-go

Sep 2019 - Jan 2023

Hyperledger Aries Framework Go provides packages for building Agent / DIDComm services.

Role in this project:

Back-end Developer

Contributions:124 reviews, 67 commits, 78 PRs in 3 years 4 months

Contributions summary:Sandra primarily focused on implementing features related to verifiable credentials, including support for multiple proofs in DID documents. The user modified code related to DID document parsing and validation and implemented Ed25519Signature2018 signature suite, which involved working on signing and verifying methods. The user also implemented aspects of the SD-JWT (Selective Disclosure JSON Web Token) flow and made several code changes on did exchange protocol.

golanghyperledgerdecentralized-identifiersaries-frameworkagent

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