A custom web application is browser-based software made for one organization, such as a customer portal, a partner tool or a staff system.
15+ years of team experience · Salesforce Select Partner · Architect-led
Custom web applications designed, built and supported by one team.
We build web applications for customers, partners and staff: discovery and UX, architecture, the build itself, security, testing, hosting and support, with Salesforce data connected where you need it.
See how a build runs
- 15+Years of team experience
- 20+Enterprise implementations
- 60 minFree Custom web applications review, with a written plan
- 5.0/5Client satisfaction (CSAT)
Proven Success With
5.0/5 CSAT
New to Custom web applications?
What is Custom web applications?
It fits a process that off-the-shelf software handles badly, or replaces a spreadsheet or aging app people depend on.
It can read and write Salesforce data through Salesforce APIs, so staff and customers work from the same records.
Where you are starting from
Do you need a custom web application?
What are you working with today?
- Path 01An idea
A new portal or product
You know the job to be done, but nothing is built yet.
- Discovery and a clickable prototype first
- A first release small enough to ship
- Architecture sized for that release
- Path 02A spreadsheet or old app
Replacing something fragile
A spreadsheet, Access database or aging app runs a process people depend on.
- Current process and data mapped
- Data migration planned early
- Old and new run side by side until cutover
- Path 03Salesforce
Opening Salesforce to outside users
Customers or partners need a tailored experience on your Salesforce data.
- Experience Cloud compared with a custom app
- APIs and sign-in designed together
- Licensing questions taken to Salesforce
A written plan with scope, architecture and milestones before the build starts
What we do
What do custom web application services include?
One team from the first workshop to the monthly support plan, so nothing is lost between handovers.
Discovery and scoping
01Users, jobs, data and constraints written down before any design.
UX and interface design
02Wireframes and clickable prototypes tested with real users.
Architecture
03The simplest design that meets your load, security and budget.
Front-end build
04React, Next.js, Angular or Vue, accessible to WCAG 2.2 AA.
Back end and APIs
05Node.js, Java, Python, .NET or PHP, with documented APIs.
Salesforce connection
06Records read and written through Salesforce APIs.
Testing and CI/CD
07Automated tests and a pipeline that deploys each approved change.
Hosting and support
08Monitoring, patching and small changes every month.
Architecture choices
Which architecture does a web application need?
We pick the simplest pattern that meets your needs. Most business applications sit toward the left.
Server-side rendering
Pages built on the server, quick to load and easy to index.
Portals and content-heavy sites.
Single-page app
The interface runs in the browser and talks to an API.
Tools people use all day.
API back end
One documented API serves the web app, mobile apps and partners.
When several clients share the same data.
Serverless functions
Small functions that run on demand.
Uneven load, scheduled jobs and webhooks.
Microservices
Separate services, deployed and scaled on their own.
Only when separate teams or scaling needs justify the overhead.
Technology stack
Which technologies do you build web applications with?
We build in a stack your team can support after launch, or recommend one if you have none.
- React
- Next.js
- Angular
- Vue
- Node.js
- Java with Spring Boot
- Python with Django
- .NET
- PHP with Laravel
- PostgreSQL
- MySQL
- SQL Server
- MongoDB
- Salesforce
- AWS
- Microsoft Azure
- Google Cloud
- Containers
- Serverless
Salesforce connection
How does a web application connect to Salesforce?
Through Salesforce APIs, with OAuth sign-in set up as an external client app, so the web application never holds a Salesforce password.
- Customer
- Web application
- Your API layer
- Salesforce
- Customer to Web application: Submits a service request
- Web application to Your API layer: Sends the validated request
- Your API layer to Salesforce: Gets an access token through OAuth 2.0
- Your API layer to Salesforce: Creates a case through the REST API
- Salesforce to Your API layer: Returns the case number
- Your API layer to Web application: Shows the case and its status
- Salesforce to Your API layer: Sends status changes through the Pub/Sub API
- Web application to Customer: Updates the customer
Security
How do you secure a web application against the OWASP Top 10?
We design and test against the OWASP Top 10:2025, the current edition. Five of its ten risks, as examples.
OWASP Top 10:2025 risk: A01 Broken Access Control
What we build in: Permission checks on the server for every request and record
How we check it: Tests that try to reach other users' records
OWASP Top 10:2025 risk: A02 Security Misconfiguration
What we build in: Hardened defaults, security headers and no debug output in production
How we check it: Configuration checks in the pipeline
OWASP Top 10:2025 risk: A03 Software Supply Chain Failures
What we build in: Pinned dependencies and reviewed lockfiles
How we check it: Dependency scans on every build
OWASP Top 10:2025 risk: A05 Injection
What we build in: Parameterized queries and output encoding
How we check it: Static analysis and dynamic scans
OWASP Top 10:2025 risk: A07 Authentication Failures
What we build in: Single sign-on or a proven identity service, with multi-factor sign-in
How we check it: Login and session tests before release
How a build runs
How does a custom web application project run?
Six phases, run as parallel workstreams. Your written proposal states the milestones and dates.
Workstream
- 01Discover
- 02Design
- 03Build
- 04Test
- 05Launch
- 06Support
Product
UX and accessibility
Engineering
Security
Delivery
Operations
Cost and timing
What it costs and how long it takes
The review is free
A 60-minute architecture review of your web application setup, with a written plan you keep.
A fixed-scope proposal first
Before any work starts you get a written proposal: a fixed-scope project with milestones, or a monthly plan. You approve it, or you do not.
Timing follows scope
How long it takes depends on what is in scope. The proposal states the milestones, so you see the timeline before you commit.
Client stories
Client work we have delivered
Real engagements, described by industry. Each story covers the starting position, what we built and how we delivered it, end to end.
Commercial & Business ServicesA Subscription Estimator and Technical Library for Fire Protection ProfessionalsA Next.js web application for a fire protection business: a searchable technical library and estimator with role-based access, manufacturer filtering, PDF output and subscriptions, with AI product identification in development.Next.js · Custom web application · Authentication and roles · SubscriptionsRead the story 
Communications, Media & TechnologyA Bilingual Knowledge Base That Answers Callers During a Major International EventA bilingual English and Japanese knowledge base for contact centre operators at a major international event: live answer suggestions, cross-language search with translated embeddings, operator content management and missing-question tracking.Custom AI · Vector search · Translated embeddings · Large language modelsRead the story 
EducationOne Tutoring Calendar Across Salesforce and TeachWorksSalesforce development for an Australian tutoring provider: a custom session calendar, two-way TeachWorks appointment sync, attendance and completion mapping, and session notes into after-session reports.Salesforce Platform · Lightning Web Components · Apex · TeachWorks APIRead the story Client reviews
What clients say about working with our architects
See how teams describe working with SynconAI, from first scope to production delivery.
Salesforce Select Partner30+ Salesforce certificationsDelivery from Delaware & Sydney, worldwide
Simply Outstanding
“SynconAI Consulting are Simply the Best in the Business When it comes to Salesforce implementation and AI-powered solutions, SynconAI are in a league of their own. Their expertise, dedication, and ability to deliver results that truly move the needle sets them apart from every other consulting partner we've worked with. What they achieved with our Sales Cloud, Service Cloud, and custom Agentforce agent has completely transformed how we operate streamlining our pipelines and our customer service, and automating tasks that used to consume hours of our team's time. They don't just implement technology they transform businesses. If you want the best, you work with their team.”
Sales CloudService CloudAgentforce
Jack BennettConsumer Goods & Retail · United States
“I had a very urgent deadline for our project reporting to be delivered and needed to build the module, dashboard and output reports in Salesforce. SynconAI were very responsive - they met with me online, responded to my emails quickly and took calls - whatever was needed to progress the work quickly. We are thrilled with the outcome and will continue to work with SynconAI in the future to continue to build our Salesforce capability and platform.”
Sales CloudService CloudNonprofit Cloud
Salesforce Managed ServicesAustraliaSalesforce Verified
“The team at SynconAI were fantastic, and promptly delivered on each project. They were able to guide us through every stage and made sure we were satisfied with the outcomes on multiple scopes of work.”
Sales CloudSlackFlowAgentforceMuleSoft
ManufacturingAustraliaSalesforce Verified
“They have been great and helping us transform out business by bringing what I conceptualize to life. Great at translating process/workflow needs into a solution. Been a pleasure work with and they're a critical part of our team and will be instrumental into bringing about my vision.”
Sales CloudFinancial Services CloudArchitectureAI
Financial ServicesUnited StatesSalesforce Verified
“Working with SynconAI was a seamless and highly professional experience from start to finish. They took the time to deeply understand our business processes before designing and implementing a Salesforce solution tailored specifically to our operational needs. The team demonstrated strong technical expertise across Salesforce configuration, automation, integrations, reporting, and user experience design.”
SalesforceExperience CloudCustom DevelopmentAutomationReporting
Salesforce ImplementationSalesforce Verified
Frequently asked questions
Custom web applications, answered.
Straight answers about frameworks, architecture, security, accessibility, Salesforce and support.
Designing, building and supporting browser-based software made for your organization, such as portals, staff tools and booking or quoting apps, instead of bending an off-the-shelf product to fit.
React, Next.js, Angular and Vue on the front end; Node.js, Java with Spring Boot, Python with Django, .NET and PHP with Laravel on the back end. We match your team's skills where we can.
Only when separate teams or scaling needs justify them. Most business applications are easier to run as one well-structured application with an API, plus serverless functions for background jobs.
We design and test against the OWASP Top 10:2025, run dependency and static scans in the pipeline, and fix findings before release.
Yes. We design and test to WCAG 2.2 level AA, with keyboard, screen reader and contrast checks at every stage of the build.
Yes. It reads and writes through Salesforce APIs with OAuth sign-in. If Experience Cloud fits your need better than a custom app, we tell you before you build.
It runs in your cloud account. Support runs on a monthly plan covering monitoring, patching, fixes and small changes, agreed in writing.
It depends on scope. The written proposal sets out the milestones before work starts, and the first release is kept small enough to ship and learn from.
Salesforce and Experience Cloud are trademarks of Salesforce, Inc. React, Next.js, Angular, Vue, Node.js, Java, Spring Boot, Python, Django, .NET, PHP, Laravel, AWS, Microsoft Azure and Google Cloud are trademarks of their owners. OWASP is a trademark of the OWASP Foundation. SynconAI is an independent consulting firm; apart from its Salesforce partner status, it is not affiliated with or endorsed by these companies.
Free architect conversation
Talk to an architect, not a sales rep.
60 seconds to brief us. A certified architect replies within one business day.
