Janko Krstic
Freelance Blockchain Engineer at Toptal
Serbia
Summary
👤
Senior🎓
Top SchoolJanko Krstic is a freelance blockchain engineer with eight years of experience specializing in permissioned ledgers (Quorum, Tendermint, Fabric) and Self-Sovereign Identity solutions using Hyperledger Indy and Aries. He has applied his expertise at companies like Evernym and Toptal, building secure, production-ready identity systems and bespoke Hyperledger-based solutions for clients. Janko contributes to the indy-sdk by authoring practical how-tos and code examples in Python and Java for credential issuance, ledger interactions, and wallet-based proof flows, underscoring a developer-first approach to decentralised identity. Based in Serbia, he blends hands-on backend engineering with protocol-level understanding, making complex distributed-ledger concepts accessible to implementers. Colleagues know him for turning cryptographic primitives into working application patterns and clear documentation that accelerates onboarding for teams new to SSI.
8 years of coding experience
4 years of employment as a software developer
Information Technology, Information Technology at University of Belgrade
English, French, German
Github Skills (6)
indy10
javas10
hyperledger-indy10
python10
java10
zkp8
Programming languages (4)
Github contributions (5)
hyperledger-indy/indy-sdk
Mar 2018 - Jun 2018
indy-sdk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:61 commits, 15 PRs, 29 comments in 2 months
Contributions summary:Janko's commits focus on implementing how-tos for the `indy-sdk`, specifically showcasing Python and Java code examples for issuing credentials and negotiating proofs. Their work involves creating and storing schemas, credential definitions, claim requests, and claims within a wallet. They also demonstrate the process of building and sending requests to a ledger using the `indy` library.
ssizkpindy-sdksdkindy
keichiri/indy-sdk
Mar 2018 - Jul 2018
Contributions:48 pushes, 21 branches in 3 months
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