Now · Reinforcement Learning Specialist @ SpaceXAIGrok

Portfolio · AI systems · Frontend · Fullstack

Harshit Sangani

Building Grok at SpaceXAI · RL environments, LLM post-training tooling & MCP · AI systems

Frontend engineer turned AI systems builder — 8+ years shipping high-performance products, now building RL environments and LLM tooling at SpaceXAI.

Explore work Resume

GitHub LinkedInIndia · previously Berlin & Hyderabad

8+ yrs craft

SpaceXAI · Landeed YC · Berlin

Years shipping

550K+

Peak DAU

1.2M+

Community reach

SpaceXAI

Current

ReactVueTypeScriptRL EnvironmentsLLMsMCPFlutterPropTechAI SystemsProduct UIReactVueTypeScriptRL EnvironmentsLLMsMCPFlutterPropTechAI SystemsProduct UI

01 — Now

Currently building

Latest from LinkedIn — RL environments and LLM tooling for Grok at SpaceXAI.

Current roleGrok

Reinforcement Learning Specialist

SpaceXAI

Building Grok at SpaceXAI — reinforcement learning environments, LLM post-training tooling, and Model Context Protocol (MCP) infrastructure for AI systems.

Reinforcement learning environments for model training loops
LLM post-training tooling and evaluation pipelines
MCP and AI systems that bridge research and product

Visit x.ai See related work

Company

SpaceXAI

Building Grok

Focus: RL environments · LLM post-training · MCP · AI systems
Since: January 2026 · India
Previously: Landeed (YC) · Purpose Digital · REO

“RL environments, LLM tooling & MCP.”

Previous · YC

Landeed

550K+ DAU · wallet · agentic title search

Impact

9× traffic

60K → 550K daily users in 6 months

Conversion

2% → 3.8%

Funnel UX + Mixpanel instrumentation

02 — About

Craft, systems, and shipping

I'm a frontend engineer with 7+ years designing and building high-performance, scalable web and mobile applications using React, Vue, and TypeScript — and I've expanded into AI systems, reinforcement learning environments, and LLM post-training tooling.

Currently I'm a Reinforcement Learning Specialist at SpaceXAI, building Grok-related RL environments, LLM post-training tooling, and MCP infrastructure.

Before that I was a Senior Software Engineer at Landeed (YC), where I drove 9× organic traffic growth to 550K+ daily users, shipped an end-to-end wallet, and contributed frontend for agentic property title search that powered ~$80K+ enterprise revenue.

I've led engineering teams, co-founded tech ventures, and delivered SaaS across real estate, community platforms, education, and manufacturing. I thrive where clean architecture, performance, and user-first experiences matter.

Education

Bachelor of Computer Applications, Computer Science

Saurashtra University, Rajkot

2016 — 2019

Experience

7 roles

Reinforcement Learning Specialist
NowGrok
SpaceXAI · India
Jan 2026 — Present
RL environments, LLM post-training, MCP, AI systems
- Building Grok at SpaceXAI — reinforcement learning environments, LLM post-training tooling, and MCP infrastructure.
- Working across AI systems that connect model training, tooling, and product-facing agent workflows.
- Bringing 8+ years of product frontend craft into high-stakes AI infrastructure and research-adjacent engineering.
Senior Software Engineer
YC
Landeed · Hyderabad
Nov 2024 — Jan 2026
React, TypeScript, Mixpanel, SEO, product UI, AI surfaces
- Drove 9× organic traffic growth via SEO and geo-targeting overhauls — ~60K to 550K+ daily users within 6 months.
- Built the wallet system end-to-end, unlocking ease-of-spend with 3× spend diversity and ~40% higher conversions.
- Designed Product × Engineering workflows that improved visibility, accountability, and sprint velocity.
- Contributed frontend for Agentic Property Title Search Report — supporting ~$80K+ enterprise sales revenue.
- Raised conversion from ~2% to ~3.8% by optimizing funnels and building UX improvement dashboards with Mixpanel event tracking.
Senior Software Engineer
Purpose Digital · Berlin, Germany
Nov 2022 — Oct 2024
Vue.js, React, TypeScript, Tailwind CSS, Vercel
- Built reusable Vue and React component systems that improved modularity and long-term maintenance.
- Set up Vercel deployment cycles and authored unit/integration tests to 85% coverage with a TDD approach.
- Solely developed a CO2 Calculator for landlord/tenant emission cost splits in TypeScript.
- Created TypeScript-first project foundations and stakeholder reporting for specs, activities, and status.
Senior Software Engineer
REO · Berlin, Germany
Nov 2021 — Oct 2022
Vue.js, Nuxt, TypeScript
- Integrated advanced real-estate brokerage software with Vue.js, Nuxt, and TypeScript.
- Led the team’s TypeScript migration — better practices, fewer bugs.
- Resolved user-centric issues end-to-end to lift engagement and product reliability.
Engineering Trainee
Pesto Tech · India
Jul 2021 — Nov 2021
Modern JavaScript, full-stack fundamentals
- Intensive engineering training program focused on modern software development practices.
Co-Founder
HK Byte · India
Nov 2017 — Oct 2021
React, TypeScript, Flutter, ERP & SaaS
- Started a software agency delivering ERP and SaaS solutions for business operations.
- Single-handedly architected a social media app for one of India’s largest communities — Flutter mobile + React/TypeScript web.
- Helped 8 organizations digitize paper workflows with domain-aware product design.
Junior Software Engineer
Binarybits.co · India
Jun 2017 — Nov 2017
PHP, Laravel, JavaScript
- Built and maintained web pages for an Australia-based community, keeping design consistency with PHP, Laravel, and JavaScript.

03 — Selected work

Projects that shipped

From Grok tooling to YC proptech and community platforms — hover a card for the short story.

9 projects

NowFeatured

SpaceXAI

RL · LLM post-training · MCP

Current work at SpaceXAI building Grok-related reinforcement learning environments, LLM post-training tooling, and Model Context Protocol infrastructure for AI systems.

SpaceXAI · Grok

RL environments, LLM post-training tooling & MCP.

Current work at SpaceXAI building Grok-related reinforcement learning environments, LLM post-training tooling, and Model Context Protocol infrastructure for AI systems.

AIWeb

RLLLM post-trainingMCPAI systems

2024–26

Landeed

Senior engineer at Landeed (YC): 9× traffic growth to 550K+ DAU, end-to-end wallet (+40% conversions), Mixpanel funnel optimization (2% → 3.8%), and frontend for Agentic Property Title Search (~$80K+ enterprise revenue).

Visit project

Landeed

YC proptech — 550K+ daily users, wallet, agentic title search.

2024–26

PropTechWebSaaSAI

ReactTypeScriptMixpanelSEOAI UI

2023

CO2 Calculator

Built solo at Purpose Digital — TypeScript tool for brokers and property stakeholders to compute emission cost splits under evolving regulations.

Visit project

CO2 Calculator

Cost split for CO₂ emissions between landlords and tenants.

2023

WebSaaSPropTech

TypeScriptVue.jsReactTailwind

Full-stack social platform for the Gujarati Patidar community — Flutter mobile + React/TypeScript web, dual admin systems, and deep product features for a massive user base.

Visit project