aissac

We build software products that survive contact with production.

Web and mobile products, platforms, and the AI features inside them, designed and engineered by a studio that has been shipping software for twenty years. We build the unglamorous parts that decide whether any of it works, the AI part included.

Start a project See what we have built
  • your product
  • the AI part model
  • guardrails
  • retrieval · pgvector
  • tools · MCP
  • evals · traces

the unglamorous parts

Twenty years of shipping software, for US startups, for some of the UK's busiest online businesses, and with a team built here in Romania.

  • Blinksale
  • ZenCash
  • Sleekbill
  • notonthehighstreet.com
  • Builder.ai

01 / Services

What we do

PART 01

Products, zero to one

You have a concept and a deadline. We take it from idea to a product people can use, and we stay long enough to make it stable.

  • product design
  • Next.js
  • Rails
  • evals

PART 02

Embedded senior engineering

Sometimes you do not need an agency. You need one very experienced engineer inside your team for a quarter.

  • Rails
  • TypeScript
  • iOS
  • platform

PART 03

AI inside your existing product

You already have software and customers. We add the assistant, the search or the automation without destabilising what works.

  • integration
  • pgvector
  • migrations

PART 04

Agents and automation

Agents that do real work inside real systems: tool use, retrieval, orchestration, guardrails, and the observability to know when they are wrong.

  • MCP
  • RAG
  • orchestration
  • evals

02 / Work

Things we have built

A short list, deliberately. Each of these shipped and ran in production.

  1. 01

    Blinksale

    Invoicing software for small businesses in the US. Creating, sending and tracking invoices, built and run as a subscription SaaS product.

    blinksale.com
  2. 02

    ZenCash

    A receivables CRM that took the chasing out of unpaid invoices: automated follow-ups, so businesses got paid on time without doing it by hand.

  3. 03

    Sleekbill

    Billing and invoicing for the Indian market, built around GST compliance so small businesses could invoice correctly under the tax rules.

    sleekbill.in
  4. 04

    notonthehighstreet.com

    One of the UK's best-known online marketplaces for independent sellers, running at high traffic and at its busiest through the gifting season.

    notonthehighstreet.com
  5. 05

    Builder.ai

    A platform for building custom software with AI assistance, assembling applications from reusable features with engineers in the loop.

    builder.ai
  6. 06

    TacticalTrainer

    Our own product: a strength training app that plans periodized programs. Training concepts are written in a purpose-built DSL, so new programs are declared rather than coded.

    tacticaltrainer.eu
  7. 07

    TORY

    A home inventory app for iOS, using on-device machine learning to make cataloguing what you own fast and private.

    inventory.capital

03 / Process

How this goes

  1. STEP 1

    A week to get specific.

    We start with a short paid discovery: the real constraints, the riskiest assumption, and what shipping actually means. You end up with a plan you could hand to anyone.

  2. STEP 2

    Short cycles, working software.

    Two-week cycles, something usable at the end of each one. You see progress in the product, not in a status report.

  3. STEP 3

    We leave it maintainable.

    Tests, documentation, deployment, handover. The goal is a team that does not need us and calls us anyway.

04 / About

Who you are talking to

aissac is a small studio, and small is the point. The person who takes your first call is the person who writes the code. No account manager, no handoff to a junior team, no layer between you and the work.

Istvan

I have been building software for twenty years: first for US startups, with an engineering team I put together here in Romania, then for eight years in the UK, for companies like notonthehighstreet.com and Builder.ai. I came back to Cluj and now I build software products for people who need the thing to actually work.

If you are weighing a studio against hiring, I am happy to tell you which one you need, even when it is not me.

Istvan CV and background at ihoka.me

05 / Contact

Start a project

Tell us roughly what you have in mind. A paragraph is plenty. We reply within one working day.