⚡ Full-Stack Mobile, Backend, AI & API Engineering

Production-Grade Apps, AI Features & API Integrations. Without the Agency Overhead.

We design, build and deploy reliable mobile, web and backend systems — Flutter apps, Node.js, Python and .NET services, PostgreSQL, cloud infrastructure, AI and LLM-powered features, and secure integrations with any third-party API, from payment and accounting platforms to CRMs. Senior engineering for startups and growing businesses that don't want to build a large internal team.

Get Fixed-Price Estimate Explore Our Engineering
  • Fixed Scope
  • Production Ready
  • Secure Architecture
  • Async Friendly
class InvoiceRepository {
  final ApiClient _api;

  Future<List<Invoice>> fetchInvoices() async {
    final res = await _api.get('/v1/invoices');
    return (res.data as List)
        .map(Invoice.fromJson)
        .toList();
  }
}
  1. Flutter App
  2. Backend API
  3. AI / LLM
  4. Third-Party APIs
  5. PostgreSQL

Engineering across your entire stack

  • Flutter
  • Dart
  • React
  • Node.js
  • Python
  • .NET
  • PostgreSQL
  • AWS
  • AI / LLM APIs
  • RAG Pipelines
  • REST
  • GraphQL
  • Docker
  • GitHub Actions

Products

Ready-to-use products

Software you can start using today — open the live web version or download and install the app straight from our site.

Famous POS

Our own cloud ERP for shops and restaurants — point of sale, inventory, purchasing, manufacturing, accounting and online ordering, each business on its own dedicated database.

  • Point of sale — fast checkout, tables, split bills, kitchen tickets, shifts and cash reconciliation
  • Inventory — batches, expiry, multi-store stock, reorder points and live valuation
  • Purchasing — vendor bills and payments
  • Manufacturing — recipes and bills of materials, work orders, waste and production costing
  • Accounting and financial reporting
  • Online ordering
  • Dedicated database and daily backups per business

From $49/month, 14-day free trial

Open Web App

Albatross Vibe POS

Run your shop or restaurant on our cloud POS

POS, inventory, purchasing, accounting and online ordering — your own private system, set up in minutes. Enter your email to start free for 14 days.

No credit card needed. Want a demo or have questions? Contact us

Most Popular

Standard

99 /month

  • 3 stores · 15 users
  • Restaurant POS & online ordering
Choose Standard

Premium

199 /month

  • 10 stores · 50 users
  • Manufacturing & advanced reports
Choose Premium

Services

What we build

Fixed-scope engineering across mobile, web, backend and integrations. Every project ships with documentation, tests where they matter, and a clean handover.

Financial & Third-Party API Integrations

Connect your product or internal systems to payment, accounting, CRM and enterprise platforms with production-grade reliability.

  • OAuth 2.0 authentication & token refresh handling
  • Data synchronization (invoices, customers, payments, records)
  • Webhooks & background jobs
  • Retry mechanisms & API rate-limit management
  • Error recovery & audit logging

Projects from $1,500

Discuss Integration

Full-Stack MVP Engineering

A complete product — Flutter app, backend API, database and cloud deployment — engineered by seniors from day one.

  • iOS, Android & Web from one Flutter codebase
  • Node.js / Python / .NET backend APIs
  • PostgreSQL database architecture
  • Authentication & admin systems
  • Stripe billing & notifications
  • Cloud deployment

Projects from $4,000

Build My MVP

Figma to Production Application

Your designs implemented pixel-accurately in Flutter, wired to real APIs, with every state accounted for.

  • Pixel-accurate, responsive implementation
  • Flutter architecture (BLoC / Provider / Riverpod)
  • REST API integration & form validation
  • Authentication flows
  • Error, loading & empty states
  • Production optimization

Projects from $2,000

Get UI Estimate

Backend & API Engineering

REST and GraphQL APIs, microservices and background processing in Node.js, Python or .NET — built to run unattended.

  • Node.js, Python & .NET services
  • REST & GraphQL API design
  • Microservices & queues
  • PostgreSQL, caching & background services
  • Authentication & authorization
  • Cloud deployment

Custom scope

Discuss Backend Work

AI & Machine Learning Engineering

LLM-powered features, AI assistants and intelligent automation — engineered with the same production discipline as the rest of your stack.

  • LLM API integrations (chat, extraction, summarization)
  • RAG pipelines over your own data
  • AI assistants & chatbots
  • Document processing & intelligent automation
  • Vector search & embeddings
  • Guardrails, evaluation & cost control

Projects from $2,500

Discuss AI Project

Existing System Modernization

Incremental modernization of legacy systems — APIs, databases, performance and cloud migration without a risky big-bang rewrite.

  • API modernization
  • Database improvements & performance optimization
  • Legacy migration
  • Cloud migration
  • Architecture refactoring

Custom scope

Discuss Modernization

Architecture

Architecture Designed for Production — Not Just the Demo

Clear boundaries, secure gateways and observable services. This is the shape of the systems we ship.

  1. User
  2. Flutter / Web Client Flutter · React
  3. Secure API Gateway TLS · Auth · Rate limits
  4. Application Services Node.js · Python · .NET
  5. PostgreSQL Migrations · Backups
  6. External APIs Payments · Accounting · CRM · AI

Engineering Quality

The parts your users don't see matter the most.

Anyone can demo the happy path. Production systems are defined by what happens when a token expires, a webhook duplicates, or a deploy goes wrong.

Security First

  • Secrets stay server-side
  • OAuth 2.0 done correctly
  • Proper token storage
  • Role-based access control
  • Request validation & TLS everywhere

Failure Recovery

  • Retry policies with backoff
  • Idempotent operations
  • Dead-letter handling
  • Structured logging
  • Webhook recovery & reconciliation

Maintainability

  • Clean architecture
  • Modular services
  • Dependency isolation
  • Documentation that stays true
  • Consistent coding standards

DevOps

  • CI/CD & automated builds
  • Environment separation
  • Docker & GitHub Actions
  • Monitoring & alerting
  • App store deployment automation

Process

Predictable from first call to handover

  1. Technical Discovery

    We analyze requirements, existing systems, APIs, dependencies and technical risks — before anyone talks price.

  2. Fixed Scope

    Deliverables, architecture, timeline and pricing are defined in writing before development begins. No surprises later.

  3. Build

    Development happens asynchronously with regular written updates and demo builds — no stand-up theater.

  4. Review & QA

    Functional testing, integration testing and your review against the agreed scope.

  5. Production Deployment

    Cloud and app-store deployment, documentation and a clean handover of everything we built.

Pricing

Clear Scope. Clear Price. No Endless Retainers.

API Integration Sprint

Starting at $1,500

1–2 weeks

  • API integration build-out
  • OAuth 2.0 implementation
  • Database mapping
  • Webhook handling
  • Error handling & retries
  • Technical documentation
  • Deployment
Start Integration

Most Popular

Product MVP

Starting at $4,000

2–6 weeks depending on scope

  • Flutter application (iOS, Android, Web)
  • Backend API (Node.js / Python / .NET)
  • PostgreSQL database
  • Authentication
  • Cloud deployment
  • Production build & handover
Request MVP Estimate

Engineering Sprint

Custom Scope

Scoped per engagement

  • Backend development
  • Architecture improvements
  • Existing product development
  • Complex API pipelines
  • Legacy modernization
Discuss Project

Listed prices are starting prices. Your written estimate — with the exact deliverables, timeline and fixed total — depends on scope and is agreed before development begins.

Work

Selected engineering work

Real problems, real architecture decisions, and the results they produced.

View all case studies

Why Us

A senior engineering team, without hiring one

We work as a hands-on engineering partner for startups and growing businesses — the depth of an internal team, without the overhead of building one.

More about how we work

Senior Engineering

Your project is built by experienced engineers — not routed through a junior-heavy outsourcing pipeline.

Fixed-Scope Delivery

Deliverables and budget are agreed in writing before development begins. You know what you get and what it costs.

Async by Default

Written updates, demo builds and clear decisions — no unnecessary meetings across time zones.

Integration & AI Specialists

Deep experience with OAuth 2.0, webhooks, financial and business APIs, LLM integrations and distributed systems.

Clean Handover

Code, architecture and documentation remain understandable after the project ends. You own everything.

FAQ

Common questions

How much does custom software development cost?

It depends entirely on scope, which is why we work fixed-scope: API integration projects start at $1,500, Figma-to-Flutter implementations at $2,000, and full-stack MVPs at $4,000. After a short technical discovery you receive a written estimate with deliverables, timeline and a fixed price — before any development starts.

How much does a QuickBooks integration cost?

Most QuickBooks Online integrations start at $1,500 and take one to two weeks. The final price depends on how many entities you sync (invoices, customers, payments), whether you need webhooks and background sync, and how complex the mapping to your existing data model is. We scope this precisely during discovery.

Can you integrate an existing app with QuickBooks?

Yes — that's one of our most common projects. We add QuickBooks Online integration to existing web and mobile products: OAuth 2.0 connection flow, entity synchronization, webhook handling and token refresh, built alongside your current codebase without disrupting it.

Do you work with existing codebases?

Yes. We regularly join existing projects to add features, build integrations, fix architectural problems or modernize legacy code. We start by reading the code and mapping the architecture before proposing changes, and we match the conventions already in place.

Do you build both frontend and backend?

Yes — we're a full-stack team. Frontend in Flutter and modern web frameworks; backend in Node.js, Python or .NET with PostgreSQL; plus the cloud infrastructure, CI/CD and third-party integrations that connect it all.

Do you build iOS and Android applications?

Yes. We build cross-platform apps with Flutter, which ships native iOS and Android applications (and web, where it makes sense) from a single codebase — including App Store and Play Store deployment.

What technologies do you use?

Flutter and Dart for mobile; Node.js, Python and .NET/C# for backends; PostgreSQL for data; REST and GraphQL for APIs; AWS for cloud infrastructure; Docker and GitHub Actions for CI/CD. For integrations: OAuth 2.0, webhooks and third-party APIs of every kind — payment and accounting platforms, CRMs, and LLM providers for AI features.

Can you add AI features to our product?

Yes. We build LLM-powered features into new and existing products: AI assistants and chatbots, document processing, summarization and extraction, and retrieval-augmented generation (RAG) over your own data — engineered with guardrails, evaluation and cost controls so they behave predictably in production.

How does fixed-price development work?

Before development begins we run a technical discovery, then define deliverables, architecture, timeline and price in writing. That scope is the contract: you know what you're getting and what it costs. Changes are handled as explicit scope additions, never surprise invoices.

Can you sign an NDA?

Yes. We're happy to sign a mutual NDA before discussing your project details, and we treat all client code and business information as confidential by default.

Do you provide ongoing support?

Yes. Every project includes a handover period, and we offer optional ongoing support arrangements for maintenance, monitoring and iterative development. Support is never required — the documentation and code quality are designed so any competent team can take over.

Who owns the source code?

You do. On final payment, all code, infrastructure configuration and documentation produced for your project belongs to you, delivered in a repository you control.

How long does an MVP take?

Typically two to six weeks depending on scope. An MVP with a Flutter app, backend API, database, authentication and cloud deployment usually lands in the four-to-six-week range; tighter scopes ship faster. The timeline is fixed in writing during scoping.

Start a project

Request a technical estimate

Tell us what you're building. You'll get a written response from an engineer — not a sales sequence — usually within one business day.

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Tell us about the integration you need. An engineer will review it and reply with an honest assessment of scope, risks and cost.