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41Stack
Services

What we do

We take on the software a business runs on: the customer-facing product, the internal tools behind it, and the integrations that stop your team re-typing data between systems.

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01

Custom Web Application Development

The system your business runs on, built to fit your process instead of the other way around.

Off-the-shelf software forces you to work its way. We build the thing that matches how your team already operates — portals, dashboards, booking and ordering systems, internal tools, admin back-offices. We design the data model, build the backend, and ship a fast, clean interface on top. You own the code and the data.

Discuss your project

Deliverables

  • A production web application your team uses daily
  • Data model and architecture documentation
  • Test suite, deployment pipeline, and monitoring

Technologies

Ruby on RailsPostgreSQLHotwire / TurboTailwind CSS

Estimated timeline

2–8 weeks per milestone

02

Custom SaaS Product Development

We take a product idea from scope to a shipped version your first customers can pay for.

Sign-up, billing, multi-tenancy, permissions, background jobs, and a dashboard people can actually use. We ship a small, real version in weeks, you put it in front of users, and we iterate on what they tell you — instead of disappearing into a twelve-month roadmap and hoping.

Discuss your project

Deliverables

  • A launched product your first users can pay for
  • Accounts, billing, and multi-tenant foundation
  • Admin dashboard, background jobs, and reporting

Technologies

Ruby on RailsPostgreSQLStripe / billing APIsHotwire / Turbo

Estimated timeline

6–12 weeks to first release

03

Mobile App Development

One codebase, iOS and Android, wired into the same backend as the rest of your system.

We build cross-platform apps with Flutter, so you get both stores from one codebase and one budget. Most usefully, we build the app and the API behind it together — so the phone, the web app, and your back office are all looking at the same data instead of three systems that disagree.

Discuss your project

Deliverables

  • iOS and Android apps from a single codebase
  • Backend API the app and web share
  • Store submission and release support

Technologies

FlutterREST / JSON APIsRuby on RailsPush notifications

Estimated timeline

6–12 weeks to first release

04

FBR / PRAL Integration & Compliance

Real-time FBR digital invoicing through IRIS and PRAL — integrated into the system you already use.

We built Fbrly, our own FBR digital invoicing product, so we know IRIS, PRAL, IRN, QR, and all 28 tax scenarios (SN001–SN028) end to end. We can wire the same submission flow into your existing ERP or billing system, or stand compliance up from scratch under SRO 709(I)/2025 — sandbox through production sign-off.

Discuss your project

Deliverables

  • Real-time FBR submission wired into your system
  • IRN and QR on every uploaded invoice
  • All 28 tax scenarios validated, sandbox to production

Technologies

PRAL / IRIS APIsRuby on RailsPostgreSQLPDF generation

Estimated timeline

3–6 weeks including sandbox sign-off

05

API Development & Third-Party Integrations

Make the systems you already pay for talk to each other, reliably and without manual re-entry.

We design and document clean REST APIs, and connect your software to the services your business runs on — payments, shipping, accounting, marketplaces, and government APIs. Integrations fail in boring ways: rate limits, timeouts, duplicate records. We build for that, with retry-safe jobs and error reporting you can actually read.

Discuss your project

Deliverables

  • A documented REST API or a working integration
  • Webhook handling and retry-safe background jobs
  • Monitoring and error reporting in place

Technologies

REST / JSON APIsWebhooksBackground jobsRuby on Rails

Estimated timeline

2–6 weeks per integration

06

E-commerce & Marketplace Automation

Sell across Amazon, eBay, and Shopify without three people reconciling stock by hand.

Multi-channel selling breaks down in the back office: stock drifts out of sync, orders get missed, purchasing is a guess. We centralize inventory, orders, purchase orders, and shipping across channels — we've built exactly this before, as an in-house platform handling live marketplace APIs day to day.

Discuss your project

Deliverables

  • One place to see stock and orders across all channels
  • Automated listing, order, and stock synchronization
  • Purchase order and shipping workflows

Technologies

Amazon SP-APIeBay & Shopify APIsRuby on RailsAWS

Estimated timeline

4–10 weeks depending on channel count

07

Legacy System Rescue & Modernization

Stabilize and de-risk the aging system your business depends on — without a full rewrite.

Old framework version, no tests, slow pages, and the developer who built it is gone. We've picked up that project before. We bring the stack current, add a test safety net, fix the worst performance, and leave you a codebase a new developer can actually pick up — rather than selling you a rewrite you don't need.

Discuss your project

Deliverables

  • Current framework version and patched dependencies
  • Test safety net around critical paths
  • Performance fixes and a handover-ready codebase

Technologies

Ruby on Rails upgradesRSpec / MinitestPostgreSQLCI pipelines

Estimated timeline

4–10 weeks depending on system size

How we work

How a project usually goes

A plain, written-down process. You always know what's shipping next, when, and what it costs.

  1. 01

    Discovery

    A 30-minute call on what you actually need. We tell you honestly if we're the right fit.

  2. 02

    Planning

    A short written scope: what we'll ship, the timeline, and a clear price. No surprises later.

  3. 03

    Design

    Data model, screens, and the API surface — agreed before we write production code.

  4. 04

    Development

    We ship a small, real first version in weeks, not quarters. You use it. We adjust.

  5. 05

    Testing

    A test suite around the critical paths, plus staging review with your team before launch.

  6. 06

    Launch

    Deployment, monitoring, and a clean cutover — on our hosting or yours.

  7. 07

    Support

    We can run it, keep it up, and fix bugs — or hand it over clean. Your call.

Stack

What we build on

Boring on purpose. We pick proven tools that a future developer can still maintain — mostly Ruby on Rails and PostgreSQL, with Flutter for mobile.

Backend

  • Ruby on Rails
  • REST APIs
  • PostgreSQL
  • Background jobs

Frontend

  • Hotwire / Turbo
  • JavaScript
  • Tailwind CSS
  • Flutter

Cloud & Ops

  • AWS
  • Docker
  • Kamal
  • Nginx

Integrations

  • Amazon SP-API
  • eBay
  • Shopify
  • PRAL / FBR

Have a project in mind?

Tell us what you're building. We'll tell you honestly whether we're the right team, and follow up with a clear scope, timeline, and price.

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