Harshal Sawant

Software Engineer

About Me.

Hi, I'm Harshal Sawant, a software engineer based in Mumbai, India.

I like building finance systems, HFT-style platforms, algorithm-heavy services, and low-latency distributed systems where reliability is non-negotiable and every millisecond matters.

I'm the kind of engineer who gets genuinely excited by profiling traces, clean architecture, and shaving off latency that most people can't even see. If a queue is backed up, I treat it like a mystery novel.

Social.

MailGithubTwitterLinkedInCodeforcesCal.com

Experience.

Software Engineer · Freelance

2024 - Present

Remote

  • Designed and shipped backend services in Rust using Actix Web, with a focus on low-latency request handling and reliable production behavior.
  • Built REST APIs and web application backends around HTTP fundamentals, including routing, middleware, authentication, validation, error handling, and API versioning.
  • Worked across PostgreSQL, Redis, Docker, and CI/CD pipelines to deliver maintainable services with strong observability, performance tuning, and long-term support.

Hire Me.

I’m open to software engineering roles and freelance work where I can build reliable backend systems, developer tools, and performance-critical products.

Hire MeResume

Skills & Tools.

GoRustC++PythonJavaSQLNode.jsDjangoPostgreSQLRedisDockerLinuxNix, NixOSGitHub ActionsAPI TestingTypeScriptJavaScriptReactNext.js

Projects.

androidtweaker

Active

Built and maintained a shell-driven Android optimization toolkit for rooted devices, focused on runtime tuning, repeatable tweak workflows, and easier long-term maintenance.

  • Shell
  • Android
  • Linux
  • Performance Tuning

coretaskoptimizer

Building

Implemented a native C++ root module that applies CPU affinity, scheduler policy, and I/O priority to critical Android system tasks with low-overhead boot-time execution.

  • C++
  • CMake
  • Linux Syscalls
  • Kernel Optimization
View All

Blog.

Install Linux Without USB: GRUB ISO Boot on Dual Boot

Feb 20, 2026

How to install Linux on a dual-boot system without a USB drive by booting an ISO from disk using GRUB.

How to Recover Lost Partitions on Debian-based Systems Using TestDisk

Feb 20, 2026

Step-by-step guide to recover lost partitions on Debian, Ubuntu, Linux Mint, and other Debian-based systems with TestDisk.

Support Me.

If my open-source work, tools, or technical writing helps you, consider supporting me. It helps me keep building and sharing useful developer tools.

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“Believe you can and you're halfway there.”