# Javad Rajabzadeh - Senior Software Engineer

> Explore the personal portfolio and tech blog of Javad Rajabzadeh. Expert in Blockchain, IoT, and High-Performance Software Architecture.
> URL: http://javad.dev/

## About Me
With over nine years of experience in software engineering, I specialize in architecting high-performance backend microservices, decentralized blockchain networks (Layer 1, 2 & 3), real-time AI/ML signal processing systems, and robotics modules (ROS2). Currently, I serve as **Software Technical Lead & Senior SW Engineer at Sensifai**, leading the engineering of scalable SaaS platforms integrating deep learning, video recognition, robotics, and edge IoT pipelines.

Key Expertise:
- **Software Architecture & System Design:** Go (Golang), Python, Node.js, gRPC microservices, Docker, Kubernetes, PostgreSQL, MongoDB, Redis.
- **Technical Leadership & Business Strategy:** B2B/B2C SaaS product engineering, cloud cost & energy optimization, engineering strategy.
- **Blockchain & Web3 Infrastructure:** Layer 1, 2 & 3 architectures, consensus protocols, Filecoin Lotus Devnet, TrustWallet Core contributor, Solana NFTs.
- **Robotics, AI/ML & Edge Systems:** ROS2 robotics module development, deep learning, audio-visual recognition, TensorFlow LSTM, quantized edge models (AquaSense, Q-WiSE).

Find me on the web:
- GitHub: https://github.com/ja7ad
- LinkedIn: https://www.linkedin.com/in/ja7ad/
- Twitter / X: https://twitter.com/Ja7adR
- Email: ja7ad@live.com

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## Technical Skills
- **Software Architecture & System Design:** Go (Golang), Python, Node.js, Microservices, gRPC, Docker, Kubernetes.
- **Technical Leadership & Business Engineering:** Team leadership, B2B/B2C SaaS products, cloud optimization, strategic technical roadmaps.
- **Blockchain & Web3 Infrastructure:** Layer 1, 2 & 3 architectures, consensus protocols, Filecoin Lotus Devnet, TrustWallet Core, Solana NFTs.
- **Robotics, IoT & AI:** ROS2 (Robot Operating System) module engineering, MQTT, ThingsBoard, PostgreSQL, MongoDB, Redis, TensorFlow.

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## Recent Blog Posts

- [Optimally-Modified Log-Spectral Amplitude (OM-LSA): Post-Filtering for Speech Intelligibility](http://javad.dev/posts/omlsa-speech-enhancement-postfiltering/) (2026-07-19) - An in-depth mathematical and algorithmic guide to single-channel speech enhancement using Optimally-Modified Log-Spectral Amplitude (OM-LSA) post-filtering to boost speech intelligibility and eliminate musical noise.

- [Real-Time Multichannel Speech Enhancement: Inverse-Free Rank-N Matrix Updating on Edge Hardware](http://javad.dev/posts/rankn-multichannel-wiener-filter/) (2026-07-19) - Solving matrix inversion bottlenecks in Multi-channel Wiener Filtering (MWF) using neural covariance attention and complex Conjugate Gradient solver for low-power drone and robotics hardware.


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## Work Experience
- **Software Technical Lead & Senior SW Engineer** | Sensifai (Feb 2023 - Present)
- **Lead Software Engineer** | Ramooz / MedXFactor (Jan 2022 - Feb 2023)
- **Senior Software Engineer** | farageek (Apr 2021 - Nov 2021)
- **Software Developer** | Freelance (Mar 2013 - Mar 2021)

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## Projects & Open Source Contributions
- **DoRAI (ROS2)**: Robotics AI integration module built with ROS2 (https://github.com/Sensifai-BV/dorai/)
- **Q-WiSE**: Quantized deep Wiener-filter speech enhancement model (https://sensifai-qwise.hf.space/)
- **Aerium**: Maintainer & Core Dev (https://aerium.network/)
- **Meilisearch Go SDK**: Official Golang client maintainer (https://github.com/meilisearch/meilisearch-go)
- **Artogenia**: Backend Developer (https://artogenia.com)
- **TrustWallet Core**: Contributor (https://github.com/trustwallet/wallet-core)
- **OTP (Go Package)**: Creator (https://github.com/ja7ad/otp)
- **Go Blockchain**: Creator (https://github.com/Ja7ad/Blockchain)
- **Consumption**: Creator (https://github.com/ja7ad/consumption)

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## Honors & Awards
- **OC2 - AquaSense Winner**: Real-time IoT water quality monitoring system using TensorFlow LSTM anomaly detection.
- **OC3 - Q-WiSE**: Energy-efficient deep Wiener-filter speech enhancement.