SaaS Platform Development Company
FISTA Solutions builds multi-tenant SaaS platforms with the foundations that are expensive to retrofit: provable tenant isolation, subscription billing and entitlements, roles and audit logs, enterprise SSO, and AI features carrying their own cost model and evaluation harness.
- 150+
- projects delivered
- 50+
- companies served
- 99.9%
- verified uptime
- 47%
- efficiency gains
- 12+
- countries reached
What we build
What does SaaS platform development include?
SaaS platform work covers tenancy and data isolation, authentication and roles, subscription billing with usage metering and entitlements, admin and support tooling, enterprise readiness features, and the observability and cost attribution needed to run the platform profitably.
- 01
Tenancy and isolation
Isolation enforced at the data-access layer with tenant-scoped tests in CI and a documented isolation model.
Platform - 02
Identity and roles
Authentication, granular permissions, team structures, and enterprise SSO with SCIM provisioning.
Identity - 03
Billing and entitlements
Plans, trials, proration, usage metering, and entitlement checks that match what sales actually sells.
Monetization - 04
Admin and support tooling
Internal consoles for support, impersonation with audit, and the operational actions your team needs daily.
Operations - 05
Enterprise readiness
Audit logs, data residency options, export and deletion, and the documentation procurement will request.
Enterprise - 06
Observability and cost
Tracing, error budgets, and per-tenant cost attribution so margin is visible alongside adoption.
Run
Requirements
Which requirements shape SaaS platform development?
SaaS platforms are judged by security reviewers, finance, and users at once: isolation must be demonstrable, enterprise features must exist before enterprise deals, unit economics must survive usage growth, and downtime must be rare and visible.
| Requirement | Why it matters | How FISTA builds to it |
|---|---|---|
| Tenant isolation | One customer seeing another's data ends the company. | Isolation at the data-access layer, tenant-scoped tests in CI, and an isolation model documented for security reviews. |
| Enterprise procurement | Deals stall on SSO, audit logs, and questionnaires. | SSO and SCIM, exportable audit logs, region options, and a maintained security documentation pack. |
| Unit economics | Infrastructure and AI cost scale with usage. | Per-tenant cost attribution, query and storage discipline, and margin dashboards beside product metrics. |
| Reliability | Availability is a contractual promise. | SLOs with error budgets, health checks, graceful degradation, and incident runbooks from day one. |
| Data lifecycle | Customers demand export and deletion. | Documented export formats, deletion honoring retention obligations, and evidence of completion. |
Where AI fits
Where does AI fit in SaaS platform development?
AI fits a SaaS platform where it compresses user work inside your existing surface: copilots scoped to tenant data, summarization, workflow agents with approval, and support deflection — each with an evaluation harness and per-tenant cost attribution.
- 01
In-product copilot
Scoped to tenant data and user permissions, enforced in the tool layer rather than in prompts.
- 02
Workflow agents
Multi-step tasks with approval gates and traces the customer's admin can inspect.
- 03
Support deflection
Answers from your documentation with citations, surfacing documentation gaps as a by-product.
- 04
Onboarding migration
Mapping and importing customer data from spreadsheets and competitor exports with confirmation.
- 05
Usage insight
Admin-facing answers about adoption and configuration from tenant data with the query shown.
Cost and timeline
How much does SaaS platform development cost, and how long does it take?
Cost is driven by platform maturity, enterprise requirements, and AI scope; timeline by how much existing code must be corrected first. FISTA does not quote blind: the scoping call returns an architecture assessment and a phased estimate.
For existing platforms, the assessment precedes the feature work. Adding multi-region, SSO, or AI to a codebase with weak tenant boundaries costs more than the feature suggests, and FISTA prices the corrections openly.
For new platforms, the trap is building capability nobody has asked for. FISTA scopes the foundations that are hard to retrofit — tenancy, identity, billing primitives — and defers the rest until a customer requires it.
Send the scope you have, even if it is a paragraph. You get a written brief, an architecture sketch, and a phased estimate before any commitment.
Get a scoped quoteDelivery
How does FISTA deliver custom software?
FISTA delivers custom software in four phases: a discovery sprint that turns goals into a specification with acceptance criteria, an architecture and data design with integration contracts, two-week builds with automated tests and weekly demos, and a verified release with infrastructure-as-code, runbooks, and monitoring.
- 1
Discover and specify
Workshops, process mapping, and system inventory produce a specification with acceptance criteria and a phased plan.
OutputSpecification, estimate, roadmap
- 2
Architect
Data model, service boundaries, API contracts, security, and infrastructure decisions recorded with trade-offs.
OutputArchitecture decision records
- 3
Build and demo
Two-week sprints with unit, integration, and contract tests; a demo on your environment every week.
OutputWorking increments in your repo
- 4
Verify and release
Performance and security testing against the spec, infrastructure-as-code, runbooks, dashboards, and handover or managed operations.
OutputVerified release with SLOs
Why FISTA
Why choose FISTA Solutions for SaaS platform development?
FISTA builds SaaS platforms with isolation that is demonstrable, enterprise blockers planned before the deals that need them, and per-tenant cost visible from launch. Work is contracted through a US entity with full IP assignment.
SaaS Platforms specifics
- Tenant isolation is enforced in the data-access layer and verified by tenant-scoped tests running in CI.
- Enterprise readiness — SSO, SCIM, audit logs, residency — is planned ahead of the deals that require it.
- Per-tenant cost attribution ships with the platform, so pricing decisions rest on measured margin.
- SLOs, error budgets, and runbooks exist from launch rather than after the first incident.
How FISTA engineers
- Spec-Driven Development: every deliverable starts as a written specification with acceptance criteria, so scope is testable before it is built.
- AI-native delivery: engineers direct coding agents under review gates and evaluation harnesses, compressing build time without loosening verification.
- Official Anthropic partner, with production experience across Claude, OpenAI, Google, and open-weight models, chosen per workload rather than by default.
- One accountable delivery lead, weekly demos on your environment, and code in your repositories from week one.
What you get as a client
- 150+ projects delivered for 50+ companies across 12+ countries since 2017, with 99.9% verified uptime on systems we operate.
- A US entity (FISTA Solutions Inc., Wilmington, Delaware) for contracting, invoicing, and IP assignment, with an engineering center in Faisalabad, Pakistan for cost-efficient senior capacity.
- US business-hours overlap for standups and reviews; written decision logs so nothing depends on a meeting you missed.
- Flexible engagement: fixed-scope build, embedded forward deployed engineers, or a dedicated team that you can scale month to month.
Clear answers
What buyers ask before a custom build.
Straightforward guidance for evaluating scope, fit, and the next step.
01How do you approach multi-tenancy?
Isolation is enforced in the data-access layer rather than by convention, verified by tenant-scoped tests in CI, with per-tenant configuration handled without code forks and a documented isolation model for enterprise security reviews.
02Can you work on our existing SaaS platform?
Yes, starting with a codebase and architecture assessment that states what must be corrected before the requested capability is safe, delivered inside your repositories and CI.
03What does enterprise readiness require?
Typically SSO and SCIM, granular roles, audit logs, export and deletion, region options, uptime commitments, and maintained security documentation. FISTA builds them and keeps the documentation current.
04How do you protect gross margin as usage grows?
Per-tenant cost attribution, query and storage discipline, AI model routing and caching, and margin dashboards next to product metrics, so pricing and limits are informed decisions.
05How long does a SaaS MVP take?
A focused MVP typically ships in a few months depending on integrations and how much platform foundation is genuinely needed at launch. Discovery produces the scope first.
Scoped in writing before you commit
Build the platform your enterprise buyers will approve.
Bring the product or the codebase. The scoping call returns an architecture assessment, a specification, and a phased estimate.