Engineering
Custom Application Development Services
Have a concept for a web or desktop SaaS platform, or an app for iOS and Android? We build it and plan for what comes after launch, with the founders and a senior engineer on every project.
Talk to the foundersFrom idea to a product your users rely on, without losing momentum
Authect builds custom applications end to end: product discovery, design, engineering, testing and launch, then the improvements that follow. You work directly with the founders, and every project is led by a senior engineer, so the people who scope your product are the people who build it.
We keep teams small and decisions fast. AI speeds up our delivery, and an engineer reviews every line before it ships. You see working software early and often, and the code lives in repositories you own from day one.
What we do
End-to-end application development services
Whether you're launching a new product or rebuilding one that's holding you back, we cover the whole journey: validating the idea, designing the experience, building it for web and mobile, and keeping it fast and secure after launch.
Web applications
Fast, accessible web apps and customer portals built on modern frameworks, designed around your users' key journeys and ready to scale as your audience grows.
Mobile apps for iOS and Android
SaaS platforms
AI-powered features
APIs and integrations
Product design
Bring your app or SaaS concept. We build it, and plan for the scaling, security and upkeep that follow.
Contact usService benefits
What you get with Authect's custom application development
- 01
Founders and senior engineers, not account managers
The founders run discovery with you and a senior engineer leads your project from the first sprint. Questions get answered by the people who make the decisions.
- 02
Faster delivery with AI, without the shortcuts
We use AI throughout delivery to move faster, and every line is reviewed by an engineer. You get speed and the quality you'd expect from a senior team.
- 03
Working software early and often
We ship in short increments and demo real, working software regularly, so you can test ideas with users and change direction before it gets expensive.
- 04
Security and quality built in from the start
Code review, automated tests, secure authentication and encrypted data are part of how we build, not a review at the end.
- 05
Architecture that grows with you
We design for the product you have today and the one you're planning, so adding features, users and markets doesn't mean starting over.
- 06
Everything you need to own your product
Code, infrastructure and documentation are yours from day one. If you build an in-house team later, they can pick up the work without us.
Complete visibility, straight from the people building your product
Transparency is at the heart of how we work. It builds trust and accountability, and it means you never have to wonder what is happening on your project.
There are no account managers in between: the founders and the senior engineer leading your project are the people you talk to, every week.
What you get:
- Direct access to the founders and the engineer leading your project
- Regular demos of working software, not slide decks
- A clear view of progress, budget and priorities at any time
- Code in repositories you own from day one, so you see every change as it happens
How we cooperate
Cooperation models that fit how your product grows
Every model comes with clear responsibilities on both sides, agreed before work starts, so you always know who owns what.
- 01
Fixed-price project
A clearly scoped product delivered for an agreed price and timeline. Ideal for MVPs and well-defined projects.
- Our responsibility:
- the scope, plan, budget, quality and delivery of the agreed product.
- Your responsibility:
- business context, timely feedback and sign-off on the scope.
- 02
Monthly sprints
A dedicated team, led by a senior engineer, working in short sprints, billed monthly. Ideal when your priorities evolve as you learn from users.
- Our responsibility:
- the team, sprint delivery, engineering quality and transparent reporting.
- Your responsibility:
- the product vision and setting priorities with us each sprint.
- 03
Support and evolution
After launch, we keep your product fast, secure and up to date, and keep shipping improvements as your business grows.
- Our responsibility:
- monitoring, updates, fixes and agreed response times.
- Your responsibility:
- reporting issues and planning the next improvements with us.
AI in delivery
How we use AI in delivery
AI makes our engineers faster. It never replaces their judgement: an engineer reviews every line before it ships, and your code and data stay private.
- 01
Discovery
AI helps turn workshop notes into draft user stories and open questions. A founder goes through every one with you.
- 02
Design
We use AI to explore layout options and draft interface copy quickly. Our designers make the decisions.
- 03
Development
Coding assistants take the repetitive work, so engineers spend their time on architecture and edge cases.
- 04
Testing
AI suggests test cases and generates test data. Engineers own the test suite and decide what passes.
- 05
Release and support
AI helps read logs and spot issues sooner. A person decides every fix that goes live.
Case studies
Our application development work
Mobile AppReact NativeSupabaseBredinoBredino: Verified Matchmaking & Breeding Platform for Purebred Animals39App Screens100%Verified Docs109Automated Tests
FintechTradingArtificial IntelligenceSmartTraderSmartTrader: Technical Analysis & Automated Trading Platform100k+Active Traders< 20msLatency50+Smart Tools
EdTechEsportsGamificationThe Game (UAB)The Game Academy: Gamified Tech Education Platform500+Students Trained10+Courses85%Completion Rate
How we work
Key steps in our end-to-end development process
Every project follows the same clear path, adjusted to your product. A founder is involved at every step, so priorities, budget and progress are never a surprise.
Delivery models
Product-centric vs. project-centric delivery
Most of our clients start with a project and grow into a product team. Here's how the two approaches differ, so you can choose the one that fits where your product is today.
| Product-centric delivery | Project-centric delivery | |
|---|---|---|
| Focus | Ongoing value for your users and long-term ownership of the product. | Delivering an agreed scope within a fixed timeline and budget. |
| Team | A stable team, led by a senior engineer, that stays with your product as it grows. | A team assembled for the project, handing over cleanly at the end. |
| Planning | Priorities set with you each sprint, based on what users tell us. | A written scope and plan agreed before development starts. |
| Success measured by | Business impact and how users respond to each release. | Delivering the agreed scope on time and on budget. |
| Best for | Products with evolving requirements and a long life ahead. | MVPs and well-defined projects with a clear finish line. |
Need an application that fits the systems you already use? Talk to the founders who'll build it.
Contact usIndustries
Industry-specific use cases for custom application development
Fintech
Payment flows, digital banking and wallet apps, onboarding with identity checks, lending and investment platforms, and the back-office tools that keep money moving correctly, with audit trails and strong authentication built in.
Healthcare
Patient booking and reminder apps, telehealth, clinic and practice management tools, and secure portals for patient records, designed to be accessible and to protect health data from the first line of code.
Insurance
Policy management and quoting tools, claims apps with document upload and status tracking, customer self-service portals and the integrations that connect them to your core systems.
Logistics
Fleet and delivery tracking, driver apps with route and proof-of-delivery features, warehouse tools and customer tracking pages that give everyone a live view of every shipment.
Retail
Online stores and marketplaces, loyalty and mobile shopping apps, inventory and order management, and the integrations with payments, shipping and point of sale that tie them together.
Government
Citizen service portals, online applications and payments, case management for public teams and accessible digital services built to strict security and accessibility standards.
Technologies
Tools and technologies that we use
We choose proven, well-supported technologies that fit your product and your team, so it stays easy to maintain and hire for long after launch.
Web front end
TypeScript, React and Next.js for fast, accessible interfaces, with design systems built in Tailwind CSS or your existing component library.
Mobile development
Swift for iOS, Kotlin for Android, and React Native or Flutter when one cross-platform codebase is the better fit for your product.
Back end and APIs
Node.js, Python, .NET and Go services with REST and GraphQL APIs, designed for clear contracts, versioning and observability.
Databases and storage
PostgreSQL, MySQL, MongoDB and Redis, chosen for your data and how it's used, with backups and migrations handled from day one.
Cloud and infrastructure
AWS, Microsoft Azure, Google Cloud and Vercel, with infrastructure as code in Terraform so every environment can be recreated reliably.
DevOps and quality
CI/CD pipelines, automated testing with Playwright and unit test suites, containers with Docker and monitoring that alerts us before your users notice.
AI and machine learning
Large language models from leading providers, retrieval over your own data, and the evaluation and guardrails that keep AI features accurate and safe.
Built in
What every Authect project includes
Whatever we build, these come as standard, not as extras you have to ask for.
Code review on every change
An engineer reviews every line before it ships, including code written with AI assistance.
Automated tests
Tests around the parts that matter most, run on every change so regressions are caught early.
CI/CD pipelines
Automated builds and deployments, so releases are routine rather than risky.
Security by default
Secure authentication, encrypted data and dependency checks from the first sprint.
Accessibility
Interfaces designed and tested to be usable by everyone, on every device.
Documentation
Architecture notes and setup guides, so your team or a future partner can pick up the work.
Monitoring
Error tracking and alerts that tell us about problems before your users do.
Ownership from day one
Repositories, cloud accounts and designs in your name from the first commit.
Insights
GuideTalent marketplace vs development studio: Toptal, Upwork or a team?View guide 
GuideFounder-led studio vs large offshore agency: which is right for your project?View guide 
GuideStudio vs in-house developers: the true cost of building your own teamView guide 
GuideDevelopment studio vs freelancer: who should build your software?View guide 
GuideCustom software vs no-code: when each wins, the limits and the real costs over timeView guide 
R&DPasskeys for business applications: how they work and how to roll them outView R&D post
Why Authect
Why partner with Authect for application development
- 01
Founder-led, senior-engineer-led
You talk to the founders who build your project, never a salesperson. Every project is led by a senior engineer, from the first workshop to launch.
- 02
AI-accelerated, human-reviewed
We use AI to move faster at every stage of delivery, and an engineer reviews every line before it ships. You get the speed without the shortcuts.
- 03
Everything is yours
Code, infrastructure and documentation live in accounts you own from day one. No lock-in: you can take the product anywhere, at any time.
FAQs
FAQs about custom application development
How long does it take to build a custom application?
It depends on the scope. A focused MVP can often launch within a few months, while larger platforms are delivered in stages. After discovery, you get a written plan with milestones, so you know what to expect before development starts.
How much does custom application development cost?
Cost depends on the features, platforms and integrations you need. We offer fixed-price projects for well-defined scopes and monthly sprints when priorities are still evolving. After a short discovery, you get a clear estimate from the founders, not a sales team.
Who will work on my project?
A small team led by a senior engineer, with the founders involved from discovery to launch. You talk to the people building your product directly, and you know who is on your team from the start.
Do I own the code and the product?
Yes. The code, designs, infrastructure and documentation are yours from day one, in repositories and accounts you control. There is no lock-in: you can continue with us, bring the work in-house or move it elsewhere.
How do you use AI in development?
We use AI tools to speed up work such as drafting code, generating tests and analysing logs. An engineer reviews every line before it ships, and your code and data are never used in ways you haven't agreed to.
Can you take over or improve an existing application?
Yes. We start with a review of the code, architecture and infrastructure, then agree on a plan: stabilise what's there, improve what's slowing you down and keep shipping new features without disrupting your users.