Mohammad Ali Jesar

Work with me

Senior Ruby on Rails Engineer specializing in AI integration

I build and extend production Ruby on Rails applications, integrate AI into existing products, and develop software for Shopify and other e-commerce platforms.

Open to remote full-time roles, contracts and freelance projects · Available now · Usually replies within a few hours · Flexible hours for U.S. and European time zones

With 7+ years of experience building software for international clients, I work across backend systems, full-stack applications, LLM integrations, AI agents, MCP servers, RAG and e-commerce integrations. I can help you build a new product, improve an existing Rails application, connect AI to real business data, or solve complex Shopify and e-commerce problems.

What I can do for you

Full-stack Ruby on Rails development

Build new products. Improve existing applications.

I build Rails applications and MVPs from the ground up, and extend software that is already in production, with new features, API integrations, performance fixes and upgrades across the backend and frontend.

What I work with: Ruby on Rails · PostgreSQL · Hotwire · React · APIs · Background jobs · Automated tests

7+ years of production Rails for clients in the US and Germany. See my projects.

AI engineering and integration

Build AI features that work with real application data.

I integrate LLMs into Rails apps, build AI agents that use your application's tools, and connect models to business data, with validated tool inputs, controlled write actions, evaluation and tracing.

What I work with: LLM integrations · AI agents · MCP servers · RAG with pgvector · Evals · Observability · Workflow automation (n8n)

Working projects with MCP, RAG, tool calling and agent evaluation: shop_mcp_server, ai_shop_assistant and product_geo_agent, plus fixes merged into the little_ghost Ruby gem.

Shopify, BigCommerce and e-commerce

Custom commerce features and reliable integrations.

I build store functionality that off-the-shelf apps do not cover, from custom Shopify apps and checkout changes to Shopify Plus B2B, and keep products, inventory and orders in sync across stores, marketplaces and other systems.

What I work with: Shopify apps · Shopify Functions · Checkout UI Extensions · Liquid · BigCommerce · Amazon SP-API · Product, inventory and order sync

Contributed to five published Shopify App Store apps, three also on BigCommerce.

AI search visibility for brands and online stores

Help AI assistants understand your products.

I check the product and brand information AI assistants rely on when they answer shopping questions, then fix the gaps in order of impact. No one can guarantee a recommendation, but missing information can be fixed.

What I assess: Product content · Buyer questions · FAQ coverage · Schema.org structured data · Brand mentions · AI search testing

I built product_geo_agent, an agent that runs these checks and was tested on a Shopify development store, and I apply the same practices to this website.

For agencies: I join your team as a Rails, AI or Shopify developer on client projects, including white-label work, under your process and tools.

How I work

  1. A short call or message about the problem. What is broken or missing, and what “done” looks like for you.
  2. A written plan. Scope, approach and the risks I can see, before any code.
  3. Small, reviewed steps. Work happens on branches with pull requests, tests (RSpec) and clear descriptions, so your team can follow and own it.
  4. Honest status. I say what works, what does not yet, and what I verified by running it, not just by reading docs.

Pricing

All prices are in USD.

EngagementPriceTerms
Hourly $45 to $60 per hour Flexible hours, no minimum.
Fixed-scope project Quoted after a written plan Small jobs can also be ordered on Fiverr.
Monthly contract (part-time or full-time) Rates on request

Frequently asked questions

Can you build a new product or MVP from an idea?
Yes. I help turn an idea into a working MVP by defining the core problem, agreeing on the smallest useful feature set, and building it in small, tested steps.
Can you work on a Rails app we already run in production?
Yes. I start by understanding the existing codebase, tests and application behavior. Then I make small, tested changes through branches and pull requests so your team can review them.
How do you keep AI features safe when they use real data?
Each AI feature gets validated tool inputs, permission checks, and access to only the data and actions it needs. Write actions can require a person’s approval based on your requirements, and important business rules stay in application code instead of relying on the model alone.
Can you automate business workflows?
Yes. I automate repetitive business processes, such as order handling, data entry, support triage and reporting, either in n8n or directly in Rails with background jobs, scheduled tasks and webhooks. Steps that need judgment can use AI or wait for a person’s approval, and complex business rules stay in tested Rails code.
Do you work in agile teams?
Yes. I have worked in agile teams throughout my career, taking part in sprint planning and backlog grooming, defining project scope and estimating each task, and delivering work in small, reviewable pull requests. On freelance projects I use the same approach in short iterations, so you see working software early and can change priorities as you learn.
Can you take over a Shopify app or integration someone else built?
Yes. I review the existing code, API usage, access scopes and webhooks before making changes. From there, I can fix issues, improve reliability or extend the app with tested, reviewable changes.
Are you available for full-time remote work?
Yes. I am open to full-time remote engineering roles, contracts and freelance projects, and I work with teams across U.S. and European time zones.
How much do you charge?
My hourly rate is $45 to $60, depending on the work. For fixed-scope projects, I give a quote after we agree on the requirements and plan. Monthly contract rates are available on request.

Get in touch

Available now, and I usually reply within a few hours. The fastest way is email: mohammadalijaisar@gmail.com. Tell me whether you want a full-time hire, a contract, or a project, and a little about the work and your stack.