Service · Core Engineering

Custom Software Development for Platforms, Portals, and Workflow Systems

We design and build custom software systems around your business workflows — including platforms, dashboards, portals, internal tools, SaaS-style products, and workflow systems that off-the-shelf tools cannot solve.

Scoped to systems with real business logic in them — not brochure sites or template builds.

Domain modelingTyped APIsCI pipelineHandover docsCUSTOM SOFTWAREone senior team, end to end
The problem

Problems this service solves.

  1. 01Off-the-shelf tools cannot model your specific business workflow
  2. 02Multiple tools are being used to do what one custom system could handle
  3. 03The existing codebase is too tangled to extend without regressions
  4. 04No admin panel or ops dashboard — teams manage everything manually
  5. 05Onboarding or billing flows require manual intervention at every step
What you get

Concrete deliverables, not activities.

  • Full-stack web applications and business platforms
  • Workflow systems and business logic engines
  • SaaS-style multi-tenant platforms
  • Billing and subscription integration
  • RBAC and permission systems
  • Admin panels and operations dashboards
  • Customer portals and self-service systems
  • Reporting and analytics dashboards
  • API-ready backend systems
  • Clean handover, documentation, and runbooks
The stack

What this is built on.

  • React / Next.js
  • TypeScript
  • Node.js / Python / Go
  • PostgreSQL / Redis
  • AWS / GCP

Built for these teams

Startups building a first product or platform · Growing companies whose current tools cannot scale · Teams with workflows too complex for off-the-shelf software · Businesses building SaaS products, portals, or internal systems

Typical engagement

How the weeks run.

WEEK 1

Business workflow discovery and technical scoping

We sit with the people doing the work and write down the process as it runs, including the parts that live in someone's head.

WEEK 2

Architecture, data model, and integration design

Entities, states and the rules that move between them, agreed on paper before anything is built.

WEEKS 3–N

Full-stack build sprints with weekly review

Working software every week, reviewed against the process we wrote down, not against a spec nobody rereads.

FINAL WEEK

QA, handover, documentation, and runbooks

Tests, deployment notes and the runbook for the parts that will page someone at night.

Proof

Work in this area.

Platform SupportLong-term client work

First-Aid-Kit Subscription, Audit, Stock, and Compliance Platform

A cloud-based first-aid-kit management platform for audits, stock tracking, expiry reminders, replacement ordering, subscription workflows, and compliance operations.

EcommerceLong-term client work

Shopify Ecommerce Operations Automation, Inventory, and Mobile Warehouse Apps

A connected Shopify, order management, inventory, warehouse scanning, mobile field update, and shipping handoff system for custom ecommerce operations.

Ecommerce OperationsVerified client work

Importer Operations Platform for Inventory, Marketplace Sync, Fulfillment, and Dealer Ordering

A US importer of industrial and DIY durables running stores, marketplaces, a warehouse and a dealer network needed one operations platform instead of a stack that agreed with itself only when somebody checked.

Upwork client feedback
Fantastic work — clean, logical code. Would recommend 5/5.
Upwork client feedback
Why Zasya for Custom Software Development

What makes us different.

Senior engineers, no bench

Every sprint is led by senior engineers — no handoffs to juniors mid-engagement.

Full IP ownership

Source, infra, and documentation hand over to your team. No vendor lock-in.

Built to be operated

Runbooks, dashboards, and ADRs ship with every release.

Custom Software Development — FAQ

Questions we hear every time.

How do you scope a custom build?
To outcomes, not features. We agree the measurable result first, then the smallest feature set that gets us there.
What stacks do you work in?
Stack-agnostic — most web work is TypeScript / React / Node. Backend in Node, Python, or Go depending on the workload.
Do we own the code?
Yes — full IP transfer, always.
Can you build SaaS-style products with multi-tenancy and billing?
Yes. Multi-tenant architecture, billing integration, RBAC, usage metering, and customer portals are part of our custom software scope.

Start a conversation

Plan your custom software build.

Bring the workflow your team runs on spreadsheets and side agreements. We'll tell you which parts belong in software, which belong in a process change, and what the first shippable slice looks like.

Book a value call All services30 min · free · no commitment