Siraaj Khandkar
Principal Software Engineer at Fidelity Investments
Boston, Massachusetts, United States
Summary
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SeniorSiraaj Khandkar is a Principal Software Engineer in Boston with 14 years of experience building concurrent, fault-tolerant, and geo-distributed systems. He has driven scalability and core consensus work across blockchain projects—most notably refactoring the miner logic for the widely used Helium blockchain and redesigning consensus for an L2 at Factom. Siraaj’s career spans high-throughput backend services and orchestration at companies like Fidelity, Jet, and Quantizer, plus early work on HPC tooling and VoIP performance systems. He excels at untangling production bottlenecks as networks scale (Helium grew from ~20k to ~1M nodes under his contributions) and shipping robust microservices and authentication infrastructure. Known for pragmatic, systems-level thinking, he blends deep protocol knowledge with hands-on refactoring and operational improvements. His playful Github bio hints at a polyglot curiosity and a taste for functional and systems programming.
14 years of coding experience
13 years of employment as a software developer
English, Russian, Ukrainian, Latin
Github Skills (5)
algorithm10
consensus10
erlang10
blockchain10
distributed-systems9
Programming languages (13)
Github contributions (5)
helium/miner
Mar 2021 - Nov 2021
Miner for the helium blockchain
Role in this project:
Back-end Developer
Back-end DeveloperContributions:59 reviews, 55 commits, 21 PRs in 7 months
Contributions summary:Siraaj primarily focused on refactoring the `miner` module of the Helium blockchain miner. Their changes included standardizing vote thresholds, restructuring the block creation process, and addressing stale hash issues. These code modifications indicate a strong involvement in the core logic and operational aspects of the miner's blockchain interactions. Additionally, the user made changes related to transaction handling and integration of HBBFT, showcasing their work on consensus-related components.
helium-blockchainheliumethereumblockchaincryptocurrency
xandkar/git-cheat-sheet
Sep 2014 - Aug 2022
Contributions:13 commits, 6 pushes in 8 years
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