whoami

Utkarsh
Gupta


Rulesets Team · Rust · Systems Engineer · Cloudflare London

// work experience
Systems Engineer
Cloudflare
Jan '26 → present

Rulesets Engine & Control Plane Platform · London, UK

  • Working on the Rulesets Engine — the core system powering Cloudflare's firewall, rate limiting, transform rules, and other traffic-processing products at global scale.
  • Working on the Control Plane Platform, the infrastructure layer responsible for configuration distribution and management across Cloudflare's worldwide network.
Principal Engineer / Technical Architect
tensorfox (Whistler Trading)
Dec '22 → Jan '26

Low-latency / high-frequency trading platform · Dublin, IE

Trading Platform (Rust) Joined Dec '22 · Promoted Nov '23
  • Led a team of 5 building a full trading platform across multiple exchanges — WS/SBE/FIX event listener, private account management, and order-sending service.
  • Achieved a tick-to-order latency of <12 μs and designed a tracing library with per-event overhead of <35 ns.
  • Used epoll / io_uring, NAPI busy-polling, kTLS, and zero-copy parsing for maximum throughput; analyzed flamegraphs & assembly to optimize hot paths.
  • Implemented risk controls, limit management, dashboards, and full observability pipelines into Clickhouse / Loki / Grafana.
  • Experimented with wait-free, lock-free channels & containers to minimize inter-thread latency.
HFT Quantitative Research Started Jun '23 · Promoted Nov '23
  • Built the quant research framework end-to-end: signal generation, feature selection, training data pipelines, random-forest model building, and backtesting.
  • Maintained sub-microsecond signal updates for every market tick.
  • Optimized forest evaluation using tree pruning, branchless code, and SIMD intrinsics; added parallel optimization and fill simulation to the backtester.
  • Maintained opportunity-generation tooling for replaying historical data, recording actions, and producing model training sets.
Rust Contributor
Blacksky Algorithms
Mar '25 → Jun '25

Open-source ATProto (Bluesky) infrastructure

  • Built the first independent rsky-relay — an ATProto-compliant relay aggregating 35M+ daily events from all Personal Data Servers (PDS), validating & verifying signatures, and publishing a unified event stream for downstream AppViews.
  • Built the first "moderation relay" for ATProto, aggregating & archiving all labels ever created by any labelling service for use in Content Moderation / Trust & Safety.
Senior Software Engineer
JioSaavn
Aug '20 → Dec '22

Search & AI Team · India's #2 music app, 165M+ MAU

  • DeepSearch — RNN/FM-DNN-Softmax deep learning microservice personalising 40M+ daily queries; designed on 600M training examples and shipped to production within 2 months with zero downtime.
  • Designed the A/B testing framework for simultaneous multi-variant code & model testing; authored weekly automated pipelines for data generation, training, evaluation, and deployment.
  • Transliteration — Low-latency microservice serving 13 Indic languages across all APIs; custom JSON template-based parser achieving <7 ms end-to-end transliteration.
// open-source & projects
crate · 22M downloads
etcetera

Rust crate for managing config/cache/data/state file locations. Added XDG support on macOS; adopted by numerous popular Rust CLI tools.

fork
bus (wait-free fork)

Forked the bus broadcast crate to make it fully wait-free, eliminating wakers & spin-loops for low-latency inter-thread communication.

contributions
redis-py & redis-rs, nixpkgs

Upstream fixes and improvements to redis-py, redis-rs, nixpkgs, home-manager, thingbuf, magnetic, and various Rust crates & Neovim plugins.

web · 2019
Rendezvous '19

Concert pass booking & event registration for 200K+ visitors; handled 9.5K peak req/s with Express.js & React.

android · 2014–15
CyanogenModX

Custom Android OS published on XDA Developers with 6000+ users. Kernel-level fixes, custom features, and device ports.

tools
YouTube Playlist Manager

React-based tool for bulk playlist operations using the YouTube Data API.

// technical skills
Current stack
Rust Go Tokio Serde Clickhouse Loki Grafana Prometheus Terraform PostgreSQL
Previous stack
C Python Linux API Polars Numpy PyO3 Apache Arrow AWS Rust SDK Vector Airflow / MWAA AWS S3/EC2/Lambda TensorFlow / Keras Pandas Spark FastAPI Actix-Web Redis Cluster Solr Cloud ScyllaDB MongoDB React.js Docker Kubernetes C++ TypeScript Hive / Trino Azure
// education
Indian Institute of Technology, Delhi
B.Tech · Mechanical Dept (P&I) · Jul 2016 – Jul 2020
Top 3 Engineering University
in Southern Asia
// interests
Traveling Reading Photography Sci-Fi Finance Impact of Tech on Media & Society Linguistics