Figma 
Google Ads A new product from an idea
You know the problem and the customer, but nothing is built yet.
Where we focus firstAgreeing the smallest version worth launching, then planning its data and architecture so version two doesn’t mean starting over.
Ahrefs
Semrush
Search Console
SaaS Development Service
SaaS application development for products your customers log into every day
We build the working software: the app your customers use, the backend and APIs behind it, the data it depends on and the setup that keeps it running. From a first version to new features on a live product.
What we build
Customer-facing web appsDashboards and reportingAdmin panelsAPIs and integrationsSubscriptions and billingBackground jobs and automationInternal tools turned into products
Where you’re starting from
Most projects don’t start from a blank page
Some teams arrive with an idea, others with a live product and a backlog. The work looks different depending on where you are, so here’s where we focus first in each case.
Designs or a prototype, ready to build
You have screens in Figma or a clickable prototype from your team or another agency.
Where we focus firstChecking the designs for missing states and edge cases, then turning them into working software.
New features for a live product
Customers are using it, and you need modules, integrations or improvements your team can’t fit in.
Where we focus firstLearning your codebase and conventions first, so new work fits what’s already there.
A process run on spreadsheets and several tools
Your team, or your customers, juggle spreadsheets, email and separate apps to get one job done.
Where we focus firstMapping how the work really happens before deciding what the software should do.
A product that has outgrown its platform
It started on a website builder or no-code tool, and now it’s slow, limited or hard to change.
Where we focus firstPlanning how data and users move to the new application without disrupting the people who rely on it.
What we build
Every layer of a working SaaS product
A SaaS application is more than its screens. Choose a layer to see what’s involved and why it matters.
Interface
The part your customers see and click.
- Responsive screens for desktop, tablet and phone
- Dashboards, tables, filters and forms that handle real amounts of data
- Sign-up, onboarding and account areas
- Loading, empty and error states, so people always know what’s happening
- Accessible markup and keyboard support
Good to knowBuilt from your designs, or from ours if you need them. We implement interfaces; designing them is a separate service.
Application and APIs
The rules of your product, running on the server.
- Business logic: what happens when someone signs up, invites a colleague or upgrades
- APIs your interface, mobile apps or customers’ systems can call
- Background jobs for imports, exports, emails and scheduled tasks
- Notifications and automated workflows
- Integrations with the tools your customers already use
Good to knowLogic that matters lives on the server, not in the browser, so it can’t be bypassed.
SaaS foundations
What lets one product serve many customers.
- Accounts, organisations and team invites
- Roles and permissions
- Keeping each customer’s data separate
- Plans, usage limits and subscription billing, when you charge online
- An admin area for your own team
Good to knowWhich of these you need depends on your business model. A product sold to individuals needs far less than one sold to companies with many users.
Data
How your product stores and finds information.
- A data model designed around your core workflows
- Validation, so bad data is stopped at the door
- Queries and indexes that stay fast as data grows
- Migrations from spreadsheets or an old system
- Backups, and a tested way to restore them
Good to knowWe choose the database for the job. For most SaaS products with related records, a relational database such as PostgreSQL is a sound default.
Infrastructure and delivery
Where it runs and how changes reach users safely.
- Cloud hosting set up for your expected usage
- Separate development, staging and production environments
- Automated checks and deployments for every change
- Secrets and configuration kept out of the code
- Containers, so the app behaves the same everywhere
Good to knowHosting choices affect running costs as much as performance, so we explain the trade-offs before anything is set up.
Operations
Keeping the product healthy once people rely on it.
- Error tracking and logs from the first release
- Uptime and performance monitoring
- Dependency and security updates
- Capacity planning as usage grows
- A clear route for reporting and fixing issues
Good to knowSome of this is set up during the build. Ongoing operations after launch is a separate, optional agreement.
SaaS features
Only the features your business model needs
These are the features that make an application work as SaaS. Few products need all of them at launch. Each card says when it tends to matter, so you can see what belongs in your first version.
Sign-up and sign-in
Needed whenAlmost every product
Email and password, single sign-on, or both, with secure password reset.
Organisations and teams
Needed whenSold to companies, not individuals
Workspaces, invites and switching between accounts.
Roles and permissions
Needed whenDifferent people need different access
Who can view, edit, approve or pay, enforced on the server.
Multi-tenancy
Needed whenMany customers share one product
One codebase serving every customer, with each one’s data kept apart.
Subscriptions and billing
Needed whenYou charge online
Plans, trials, upgrades and failed-payment handling through a payment provider.
Plans and usage limits
Needed whenPlans differ by seats or usage
Limits checked in the product, with clear messages when someone reaches one.
Email and in-app notifications
Needed whenUsers need to act on events
Invites, reminders and alerts, sent reliably in the background.
Reporting and analytics
Needed whenCustomers make decisions from your data
Dashboards, filters and exports that stay fast with real data volumes.
Admin panel
Needed whenYour team supports customers
Tools to look up accounts, fix problems and manage plans without touching the database.
Integrations and webhooks
Needed whenCustomers use other tools
Connections to the tools your customers rely on, and events they can subscribe to.
Onboarding flows
Needed whenPeople sign up on their own
Guided setup, sample data and checklists that lead to a first result.
Audit logs
Needed whenCustomers need a record of changes
Who changed what and when, for support, security and customer trust.
Architecture, in plain language
Decisions that shape cost and growth
A few early technical choices affect how much your product costs to build and run, and how easily it can change. These are the ones we talk through with every client, without the jargon.
One application, or many services?
A single, well-organised applicationSimpler to build, test and deploy. Usually the right start for a new product.
Separate servicesUseful when parts of the product have very different loads or teams. More moving parts to run and pay for.
Our approachWe start with clear modules inside one application and split something out only when there’s a concrete reason to.
How is each customer’s data kept apart?
Shared database, separated by accountEfficient and common. Every query and background job must be scoped to the right customer.
A separate database per customerStronger separation, sometimes required by enterprise buyers. Costs more to run and update.
Our approachEither way, the separation is enforced on the server and tested, because being signed in isn’t the same as being allowed to see someone else’s data.
Build it, or use a provider?
Use an established providerPayments, email delivery and sign-in are usually better handled by specialist services.
Build it yourselfWorth it for the parts that make your product different, and for things no provider does well.
Our approachWe recommend building what sets you apart and integrating the rest, then show you the running cost of each provider.
How will it cope with growth?
Plan for what you expectDesign data, caching and background work for the usage you can reasonably foresee.
Measure, then optimiseMonitoring shows where the real bottlenecks are as usage grows.
Our approachNo system scales without limits. Handling growth depends on architecture, code quality, infrastructure and ongoing tuning, so we plan for the next stage, not every possible one.
Security and reliability
Built in from the first sprint
Security is much cheaper to build in than to add later. These are the practices we apply on SaaS builds. The exact controls depend on your product, your data and the risks it faces.
Sign-in and access
Secure authentication, and permission checks on the server for every request, not just hidden buttons.
Customer data kept apart
Tests that try to reach another customer’s data through screens, exports, files and background jobs.
Safe handling of input
Validation of everything users and other systems send in, to stop bad data and common attacks.
Secrets out of the code
Passwords, keys and tokens kept in secure configuration, never in the repository.
Up-to-date dependencies
Libraries tracked and updated, so known security issues don’t sit in the product.
Backups you can restore
Automatic backups, and a restore that has been tried, not just assumed to work.
Monitoring from day one
Error tracking and logs from the first release, so problems are spotted before customers report them.
Separate environments
Development, staging and production kept apart, so testing never touches live customer data.
How we build
From requirements to a live product
Every project gets one project lead, and you get a written scope, timeline and price before the build starts. Steps 4 and 5 repeat in short cycles, so you see working software early and often rather than at the end.
- 1
Discovery and requirements
We learn your business model, your users and the workflows the product must support, and agree what the first release has to do.
From youYour goals, how the work happens today, and any designs, documents or existing code.
- 2
Technical planning
We plan the architecture, data model, integrations and delivery order, and turn them into a written scope, timeline and price.
From youApproval of the scope before any build starts.
- 3
Design review
We check your designs for missing screens, states and edge cases. If you don’t have designs, our design team can create them first.
From youDesigns, or a decision on who creates them.
- 4↻ Repeats in cycles
Build in short cycles
We build the interface, backend, data layer and integrations in short cycles, each ending with something working you can try.
From youFeedback on each demo, and quick answers to product questions.
- 5↻ Repeats in cycles
Testing
Automated tests for core logic and permissions, plus manual checks of key journeys. You test it too before release.
From youAcceptance testing of the agreed features.
- 6
Launch
We prepare production, move any existing data, and release with a plan for what to watch and how to roll back.
From youSign-off to go live.
- 7
After launch
We fix launch issues as agreed in your proposal. Ongoing maintenance and new features continue under a separate agreement if you want them.
From youA decision on ongoing support.
Requirements change once people see working software. That’s normal. Changes are agreed in writing, with their effect on timeline and cost, before they’re built.
Launch and after
What’s part of the build, and what comes after
Launching a SaaS product is the start of running it, not the end of the project. Here’s where the build ends and optional ongoing work begins.
Part of every build
Included in your project scope
- Automated tests for core logic and permissions
- A staging environment that mirrors production
- Automated deployment set up for your project
- A launch checklist and rollback plan
- Fixes for launch issues within the agreed period
- Documentation and a handover walkthrough
Optional after launch
Agreed separately, if you want it
- Ongoing maintenance: bug fixes, dependency and security updates
- Monitoring and response to production issues
- New features and continued development
- Performance and cost tuning as usage grows
- Paying down technical debt in older code
Cost and timeline
What shapes the estimate
We don’t publish fixed prices, because two products described in one sentence can differ tenfold in effort. These are the factors that move the number. You get a written scope, timeline and price before any build work starts.
Features and user roles
Each role, such as admin, member or customer, adds screens and permission rules.
Integrations
Every external system adds work: connecting, handling failures and testing.
Data and migration
Complex reports, large data volumes or moving data from an old system.
Billing model
Simple monthly plans versus usage-based pricing, trials and invoicing.
Security and compliance
Stricter requirements mean more controls, testing and documentation.
Designs
Ready, tested designs speed things up. Building without them adds design time.
Platforms
Web only, or web plus mobile apps or a public API.
Support after launch
Whether you want ongoing maintenance and development.
To give you an estimate, we’ll ask for
- What the product does and who uses it
- The main user roles
- Any designs, prototypes or documents
- Integrations you know you need
- Existing code, data or tools to replace
- Your launch goal and budget range
Don’t have all of this? That’s fine. We can work it out together on a call.
Request a Development EstimateChoosing a development partner
Questions to ask any development team
Whoever you hire, get clear answers to these before you sign. Here are ours.
Who will I work with day to day?
One project lead, from planning to launch, who explains technical decisions in plain language.
Will I know the cost before you start?
Yes. You get a written scope, timeline and price, and you approve them before any build work starts.
Who owns the code?
You do. The code and project files belong to you, and the repository and cloud accounts can be set up under your company from day one.
What happens when requirements change?
Changes are written down with their effect on cost and timeline, and you approve them before they’re built.
How will we know if something breaks?
Error tracking and monitoring are set up from the first release, not added later.
Can someone else take over the code later?
Yes. We write readable, documented code in common tools and hand over everything, so you’re never locked in.
Technology
Tools we use, and why
We pick technology for the job, not the trend. These are the tools we use most on SaaS builds, and what each one is for.
- Interfaces
React and Next.js
Fast, interactive screens, and pages that load quickly and can be found by search engines.
- Code quality
TypeScript
Catches whole classes of mistakes before your users do, and makes code easier for new developers to pick up.
- Backend
Node.js and Python
APIs, business logic and background jobs. Python is especially useful for data processing.
- Data
PostgreSQL
A reliable relational database for the connected records most SaaS products are built on.
- Delivery
Docker
Packages the application so it runs the same way on a laptop, in staging and in production.
- Hosting
AWS
Cloud hosting and managed services for databases, files, email and scaling.
Our work
Results from our client projects
Client names are withheld. We’re happy to share more detail on a call.
Case 01
Learning app · ItalyRead case study →
Driving theory app
We designed the product, built the app and the website, then grew it with advanced SEO (including AEO and GEO) and Google Ads.
DesignDevelopmentSEOPPC
SaaS
+38%
quiz completion
SaaS
1.8s
average page load
SEO
~20,000
organic visits a month, from a new domain
Case 02
HR platform · Idea to launchRead case study →
HR management software
We took an HR platform from idea to launch: product design, development and a new website, then SEO to bring in users.
DesignDevelopmentSEO
SaaS
+45%
trial signups
SaaS
−40%
HR admin time
SEO
~11,000
organic visits a month, from search
Case 03
Wellness platform · New ZealandRead case study →
Men’s wellness platform
This client had outgrown their website builder. We rebuilt it as a SaaS platform with an admin dashboard, automated emails and a new website.
DesignDevelopmentSEO
SaaS
+40%
member engagement
SaaS
−30%
admin work
SaaS
50%
faster page loads
Testimonials
In their own words
Client names are withheld. Each quote comes from a real client and is shown with their company type only.
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Services
Other SaaS development services
This page covers building and running a SaaS application. If you need something more specific, one of these may fit better. You can also combine them.
01
B2B SaaS Website Development
Fast, search-friendly marketing websites for B2B SaaS, built so your team can publish and update pages without a developer.
- Built with Next.js or a CMS your team can edit
- Fast pages, technical SEO and tracking set up
- Sign-up and demo forms connected to your tools
02
SaaS MVP Development
A focused first version of your product, built to launch, learn from real users and keep growing without a rewrite.
- Scope cut to what version one needs
- Accounts, the core workflow and billing if you need it
- Clean code you can keep building on
03
AI-Driven SaaS Development
AI features inside your product, such as search, summaries, assistants and automation, built with sensible safeguards and running costs in view.
- Use cases chosen for real value to users
- Integration with established AI model providers
- Testing for accuracy, cost and data privacy
04
SaaS Development Consulting
Experienced technical advice on architecture, tech stack, code quality or scaling, before you commit budget to a build.
- Architecture and tech stack reviews
- Code and infrastructure health checks
- A clear plan your team can act on
05
Offshore SaaS Development
A dedicated development team working as an extension of yours, with one project lead and regular demos.
- Developers who work only on SaaS products
- Your tools and process, with working hours that overlap
- Scale the team up or down as you need
FAQ
Questions about SaaS development
It’s building software that customers use over the internet, usually through an account and often on a subscription. Compared with one-off software, a SaaS application serves many customers from one codebase, needs accounts, permissions and often billing, and is updated continuously while people use it.
Yes. We can add features, integrations or modules to a live product. We start by learning your codebase and conventions, so new work fits what’s already there.
Yes. We review them for missing screens and edge cases first. If you don’t have designs, our SaaS UI/UX design team can create them.
With a focused first version. Our SaaS MVP design service shapes what version one should do, and our SaaS MVP development service builds it.
Most SaaS products serve many customers from one application, so they need some way to keep each customer’s data apart. Very few new products need microservices. A well-organised single application is usually simpler, cheaper and easier to change.
We build in secure sign-in, server-side permission checks, separation of customer data, input validation, backups and monitoring. The exact controls depend on your product and the data it holds. No one can honestly promise software that’s 100% secure.
You do. The code and project files belong to you. We recommend keeping the repository and cloud accounts under your company.
It depends on features and user roles, integrations, data, billing, security requirements and platforms. You get a written scope, timeline and price before any build work starts.
That depends on scope too. Because we build in short cycles, you see working software early, well before the full release.
We fix launch issues within the period agreed in your proposal. Ongoing maintenance, monitoring and new features are available under a separate agreement.
Yes. We can take on a module, a feature set or a specific technical problem, and work within your team’s tools and review process.
Tell us what you’re building
Book a call and walk us through the product, the people who’ll use it and where you are today. We’ll ask the questions that shape the build and tell you honestly how we’d approach it.
Discuss Your SaaS Application
Prefer email? Write to hello@saasassistant.com
What happens next
- 1You pick a time for a call.
- 2Send any designs, documents or code beforehand, if you have them.
- 3We follow up with questions, then a written scope, timeline and price.