Custom Software Development
When off-the-shelf stops fitting, build the system you actually need.
Custom web platforms, portals, internal tools and integrations, designed around how your business works. Built AI-native on the Agentic SDLC, so you see working software every week.
- Weekly working demos
- AI-native delivery
Free 30-minute call with a senior product manager. Reply within one business day. Based in Jaipur, working with businesses across India.
- Discovery callFree 30 minutes with a senior specialist
- Scoped first phaseWritten scope, timeline and fixed price
- Build with weekly demosWorking software you can see every week
- Launch and supportGo-live with your team ready, then ongoing support
What is custom software development?
Custom software development is building a system around how your business actually works, instead of bending your process to fit an off-the-shelf product. Stack18 builds web platforms, customer and partner portals, internal tools and integrations, and shows you working software every week.
You need Custom Software Development when…
Tap the ones that apply to you.
Custom Software Development, end to end.
Each capability is delivered by the same team on the Agentic SDLC, with your approval at every critical step.
Business platforms
Systems that run core operations: orders, projects, field work, approvals.
- Workflow and role design
- Admin and reporting
- Mobile-ready interfaces
Customer & partner portals
Self-service for customers, dealers, vendors and agents.
- Secure login and roles
- Orders, documents and payments
- Notifications on WhatsApp and email
Internal tools
Fast, focused tools that remove spreadsheets and copy-paste.
- Dashboards and back-offices
- Bulk operations
- Audit trails
APIs & integrations
Connect ERP, CRM, payment, GST and logistics systems reliably.
- REST and event-driven APIs
- Tally, GST and payment integrations
- Monitoring and retries
AI features
Search, assistants, document reading and predictions built in.
- Document AI
- Copilots for staff
- Recommendation and forecasting
Support & evolution
We keep it running, secure and improving after launch.
- SLAs and monitoring
- Security patching
- Monthly improvement sprints
A typical Custom Software Development engagement, week by week.
Senior people lead every phase. Specialised AI agents on the Agentic SDLC handle the repetitive work, and nothing ships without your approval.
Discover
Workshops, user interviews and process mapping.
Design
Architecture, data model and clickable prototype.
Build
Two-week sprints with working demos and your approvals.
Launch
Hardening, data migration, training and go-live.
Evolve
Hypercare, monitoring and improvement sprints.
Start small. Scale when it works.
Every engagement begins with a short, fixed-price step so you can judge the fit before committing further.
Discovery Sprint
Ideas that need scope, design and a reliable estimate.
- Duration
- 2 weeks
- Pricing
- Fixed price
- User stories and scope
- Clickable prototype
- Fixed-price build quote
Fixed-scope Build
Well-defined products with a clear launch date.
- Duration
- 6–16 weeks
- Pricing
- Fixed price
- Sprint plan and weekly demos
- Production release
- 30 days of hypercare
Dedicated Product Pod
Evolving products with a long roadmap.
- Duration
- Ongoing
- Pricing
- Monthly team
- PM, design and engineers
- Agentic SDLC acceleration
- Flexible scope
Free scoping session and estimate
Share your idea or the process you want to fix. We will map it with you and send an indicative estimate and timeline.
- Feature breakdown
- Indicative cost and timeline
- Build vs buy view
We agree targets before we start.
Every engagement has a baseline and a target on the measures that matter to you, reported at every read-out.
Where Custom Software Development makes the biggest difference.
Logistics company
- Challenge
- Trips, PODs and billing tracked in five tools.
- What we do
- Custom operations platform with driver app, POD capture and auto-billing.
12 weeks
Insurance distributor
- Challenge
- Agents emailed documents for every policy.
- What we do
- Agent portal with document AI, status tracking and commissions.
10 weeks
Construction firm
- Challenge
- Site progress reported by phone.
- What we do
- Field app with photo logs, approvals and project dashboards.
8 weeks
Custom Software Development questions.
How do you estimate cost?
After a short discovery we give a fixed-price quote for a defined scope, or a monthly team cost for evolving products.
How does AI-native delivery help me?
Specs, code, tests and documentation are generated and kept in sync on the Agentic SDLC, so you get more working software per week, with human review at every gate.
Can you take over an existing system?
Yes. We start with a code and architecture review, stabilise it, then improve it.
What happens after launch?
30 days of hypercare are included. After that, choose a support plan or hand over to your team with full documentation.
Do you provide custom software development in Jaipur and across India?
Yes. Stack18 is headquartered in Jaipur, Rajasthan, and delivers custom software development for businesses across India. You get a free 30-minute call, a fixed-price first step and working software every week, so the engagement works the same whether you are in Jaipur or elsewhere.
Often combined with.
Custom builds usually sit alongside other work: enterprise software development when the system must run across departments, SaaS product development when you will sell it to others, or legacy modernization when it replaces an older system. If a standard ERP covers most of what you need, evaluate Business OS before commissioning a full build. Browse all Stack18 services.
Enterprise Software Development
Enterprise software that meets the bar for scale, security and audit.
Explore →Product EngineeringSaaS Product Development
Turn a SaaS idea into a product customers pay for, and keep paying.
Explore →ModernizationLegacy Modernization
Retire technical debt without stopping the business.
Explore →Accelerate with a pre-built solutionBusiness OS
Sales, purchase, stock, accounts and payroll in one ERP. Start from a production-ready base instead of a blank page.
See editions and prices →Let's scope your Custom Software Development project.
Tell us where you are and where you want to be. A senior product manager will reply within one business day with next steps.
- Free 30-minute consultation
- Indicative estimate after the call
- NDA available on request