Available for new projects

Freelance software engineer building custom AI tools for startups & small businesses.

Custom dashboards, AI chat assistants, workflow automations, CRMs, and web apps — built to fit your business, not the other way around. You work directly with a senior engineer, start to finish.

Book a free 30-min call See what I build →
Recent work
Azuri — Sustainability RAG agent · Full-stack MVP builds · AI-powered web apps · 5 yrs engineering @ TripleLift, Lululemon

What I build

Custom software that actually
fits how your business works.

Not off-the-shelf. Not a bloated SaaS subscription. Built for you, owned by you — and way more useful than another spreadsheet.

💬

AI Chat & Knowledge Assistants

Imagine being able to ask your business's data a question and get a real answer. I build AI chat tools trained on your docs, SOPs, product info, or knowledge base — so your team (or customers) can find answers instantly.

Great for: customer support, internal wikis, sales enablement
🔄

Workflow Automation

That thing your team does manually every week? We can probably automate it. I build custom automations that connect your tools, trigger on events, and handle the repetitive stuff so your people can focus on the work that matters.

Great for: ops teams, agencies, service businesses
📊

Dashboards & Data Visualization

Replace the mess of spreadsheets and manual reports with a real dashboard. I build custom analytics interfaces that pull from your actual data sources and give you the numbers you actually care about, updated in real time.

Great for: ops, sales tracking, client reporting
🗂️

Custom CRMs & Internal Tools

Off-the-shelf CRMs and project tools are built for everyone, which means they're perfect for no one. I build lightweight custom CRMs, client portals, and internal tools shaped exactly around your workflow — not the other way around.

Great for: agencies, consultancies, field service businesses
📋

Replace Your Spreadsheets

If your business runs on Excel or Google Sheets, there's probably a better way. I take the logic you've built in spreadsheets and turn it into a real app — with proper UI, permissions, data integrity, and no more broken formulas.

Great for: any business outgrowing manual tracking
🚀

MVP & Product Builds

Have a product idea but no technical co-founder? I take you from rough concept to working software. Fast, focused, and built on a real foundation — not duct tape — so you can validate and grow without starting over.

Great for: early-stage founders, side projects, new ventures

Not sure which one applies to you? That's exactly what the free call is for. Most of my best projects started with "I'm not sure if this is even possible."

Book a free 30-min chat

How it works

Simple engagement,
real accountability.

I keep it lean. No agency bloat, no scope creep, no surprises.

01

Discovery call (30 min)

We talk through what you're building, what's blocking you, and whether I'm the right fit. No pitch, no pressure.

02

Scoped proposal

I send a clear proposal: what I'll build, timeline, deliverables, and fixed or milestone-based pricing. You know exactly what you're paying for.

03

Build & ship

I build in the open — shared repo, weekly check-ins, async updates. You see progress as it happens, not just at the end.

04

Handoff & beyond

Clean handoff with docs. If you need ongoing support or a second phase, I'm here — but there's no lock-in.

Who I work with

Built for founders and
teams that move fast.

I work best with people who know what they want to build, even if they don't know exactly how.

Early-stage startups

Need to ship an AI-powered MVP yesterday

You have a vision, maybe a deck, definitely no time. I get you to a working product fast without sacrificing the foundation.

  • Prototype → production in weeks
  • AI-first architecture from day one
  • Equity or hourly — flexible

Small & mid-sized businesses

Ready to actually use AI, not just talk about it

You have a real business with real data. I help you stop leaving it on the table by building tools that put it to work.

  • Integrate AI into existing workflows
  • Internal tools & automations
  • Fixed-scope, predictable pricing

Technical teams

Need a senior contractor to plug in and ship

Your team is stretched. I embed quickly, ramp fast, and contribute from day one. No babysitting needed.

  • 5 years of production engineering
  • Full-stack + AI/ML
  • Contract or part-time retainer

Tech stack

I work in the tools
your team already uses.

AI / ML

OpenAI API Anthropic Claude LangChain LlamaIndex Qdrant Pinecone Hugging Face RAG pipelines Prompt engineering

Frontend

React Next.js 14 TypeScript Tailwind CSS Framer Motion shadcn/ui

Backend & Data

Node.js FastAPI Python Supabase PostgreSQL REST APIs GraphQL

Infra & Deploy

Vercel AWS Docker GitHub Actions

About

Senior engineer.
Builder mentality.

I'm Sol — a full-stack engineer with five years of production experience across adtech, insurtech, and consumer hardware. I've shipped at companies like TripleLift and Lululemon/MIRROR, and I'm currently finishing an OMSCS in Systems Engineering at Georgia Tech.

I started taking on contract work because I like the focused problem-solving of it: one team, one problem, real stakes. I'm not a consultancy or an agency — you work directly with me, and I bring a senior engineer's judgment to every decision.

🎓OMSCS · Georgia Tech — Systems Engineering
🏢Previously: TripleLift, Lululemon/MIRROR, Blackboard Insurance
🛠️5 years production engineering · Full-stack + AI/ML
📍Based in Massachusetts · Serving Boston, Massachusetts, Brooklyn, Queens, NYC & beyond (remote-friendly)
🌐soljin.io — portfolio & side projects
5 years of production
engineering experience
3 industries shipped in:
adtech, insurtech, hardware
1 person you're working with —
no middlemen, no handoffs
☕

Let's chat — no strings attached.

Seriously, just a casual 30-minute call. Tell me what's going on with your business, what's frustrating you, what you wish existed. I'll tell you honestly if I can help — and if I can't, I'll point you in the right direction.

📅 Book a free 30-min call

No pitch. No pressure. Just a conversation.

Get in touch

Tell me what you're building.

Short intro, project idea, or just a question — I respond to everything within 24 hours.

Start a conversation

Takes 2 minutes. No commitment on either side.

Or email directly: hello@soljin.io

FAQ

Common questions

What kind of businesses do you work with?

I work with early-stage startups that need to ship an AI-powered MVP fast, and small-to-medium businesses that need custom software — dashboards, automations, CRMs, internal tools — without the overhead of a full agency. If you're a team of 1–50 people with a real problem and a budget to solve it, we're probably a good fit.

Can you replace our Excel spreadsheets with a real web app?

Yes — this is one of the most common projects I take on. I take the logic your team has built in Excel or Google Sheets and turn it into a proper web application with real UI, user permissions, data validation, and no broken formulas. Most businesses are surprised how much faster their team moves once the data actually lives in a real system.

What's the difference between you and a dev agency?

You work directly with me — a senior engineer with 5 years of production experience — on every aspect of the project. No account managers, no handoffs to junior devs overseas, no markups. That means faster communication, better decisions, and a codebase you can actually maintain after I'm done.

Can you build an AI chatbot for my business?

Yes. I build AI chat assistants and knowledge tools that are trained on your actual business data — your docs, SOPs, product catalog, support history, whatever's relevant. These are production-grade RAG (retrieval-augmented generation) systems, not generic ChatGPT wrappers. They actually know your business.

How much does a project cost?

It depends on scope — but I work on both fixed-price projects (best for well-defined work) and hourly/retainer arrangements (best for ongoing or exploratory work). The free discovery call is the best way to get a real number. I'm transparent about pricing and will tell you honestly if something is out of scope.

How do I get started?

Book a free 30-minute call or send me a message below. We'll talk through what you're trying to build, what's blocking you, and whether I'm the right fit. No pitch, no commitment required on either side.