Launch SaaS products that
scale globally.
From idea validation to enterprise-scale deployment, EVSORA designs and develops secure, cloud-native SaaS platforms with subscription billing, multi-tenancy, AI capabilities and enterprise integrations.
SaaS engines we ship on every day
Traditional software vs. modern SaaS
Software-as-a-Service is more than hosting in the cloud — it's a different operating model, revenue model and growth model.
- 1Installed on each machine
- 2Manual updates and patches
- 3Sold once — perpetual license
- 4Single customer, single deployment
- 5Limited remote access, VPN gated
- 1Cloud hosted, browser-native
- 2Continuous, automatic updates
- 3Subscription revenue, predictable ARR
- 4Multi-tenant, served at internet scale
- 5Accessible anywhere, on any device
Twenty product families. One engineering bench.
From vertical SaaS for regulated industries to horizontal tools used across thousands of teams — we ship the entire stack.
Custom sales, marketing and service CRMs with pipelines, AI scoring and reporting.
Finance, ops, inventory and HR — one source of truth.
Recruiting, onboarding, payroll, reviews and engagement.
Multi-entity, multi-currency, automated bookkeeping.
Listings, tenants, leases, maintenance and accounting.
Multi-vendor commerce, escrow payments, ratings, payouts.
Courses, cohorts, assessments, certificates, analytics.
EHR, telehealth, scheduling, billing — HIPAA-ready.
Quote-bind-issue, claims, underwriting, broker portals.
Boards, sprints, dependencies, time and capacity.
Calendars, payments, no-shows, marketplaces.
Recurring billing, dunning, plans, addons.
Gated content, communities, drip access, billing.
Accounts, cards, KYC, ledger, payments, treasury.
Controls, audits, evidence, vendor risk, frameworks.
Telematics, dispatch, ELD, maintenance, fuel.
Onboarding, contracts, POs, performance, payments.
Self-serve dashboards, files, billing, support.
AI search, content, drafts, gated articles, analytics.
Warehouses, models, dashboards, embedded analytics.
Twenty capabilities, production-grade
The cross-cutting features every serious SaaS needs — engineered once, composed everywhere.
Schema-per-tenant, row-level or hybrid isolation.
RBAC + ABAC with field-level controls.
Plans, trials, proration, dunning, taxes.
Metered events, credits, overages, hybrids.
Per-tenant theming and custom domains.
Local pricing, FX, EU VAT, US sales tax.
i18n, RTL, region-specific content.
Typed REST + GraphQL, OAuth, rate limits.
Product, revenue, cohort and funnel analytics.
In-app, email, push, Slack, WhatsApp, SMS.
Immutable, exportable, SOC 2 ready.
Visual builder, AI actions, scheduled jobs.
Branded self-serve for end customers.
Tenant ops, impersonation, support tools.
S3-grade storage, signed URLs, virus scanning.
Assistants, search, predictions, generation.
Inbox, SLAs, AI-suggested replies.
Scheduled, exportable, narrative summaries.
SSO, MFA, SCIM, audit, encryption.
Stateless, autoscaling, multi-region ready.
From first trial to enterprise renewal
The end-to-end billing lifecycle, modeled correctly — so finance, product and customer success share one truth.
Frictionless signup, no-card or card-on-file.
Plan selection, addons, seats, proration.
Stripe, Paddle, PayPal, Lemon Squeezy, Chargebee.
Branded PDF, tax-compliant, multi-currency.
Smart retries, dunning, churn rescue.
Mid-cycle changes, credits, prorated billing.
Win-back flows, exit survey, data export.
MRR, ARR, LTV, churn — accountant-grade.
Stripe Billing
PayPalA reference stack engineered for isolation and scale
Strict tenant isolation at every layer — identity, data, storage, compute and observability — without surrendering operational simplicity.
Sign up, SSO, role mapping, identity providers.
Cloudflare / CloudFront, WAF, rate limiting, DDoS.
Global LB, sticky regions, zero-downtime deploys.
AuthN/Z, throttling, request shaping, versioning.
OAuth, SAML, OIDC, MFA, SCIM provisioning.
Stateless microservices per bounded context.
Pooled tenants, sharded silos, read replicas.
Encrypted, signed URLs, per-tenant prefixes.
Metrics, traces, logs, audit, SLO alerting.
Multi-region, IaC, autoscaling, disaster recovery.
The surfaces your customers will actually use
Every SaaS we ship comes with a polished, role-aware UI — admin, customer and ops portals designed like consumer products.
Tenant health, billing, support and ops at a glance.
Self-serve plan, invoices, users, settings.
Plans, addons, seat counts, renewals.
Invoices, payments, refunds, disputes, taxes.
MRR, ARR, churn, expansion, cohorts.
Roles, SSO, SCIM, audit, impersonation.
Plan-gated releases, A/B tests, kill switches.
Every change, every actor, immutable trail.
Scheduled, exportable, narrative summaries.
From first visit to multi-year renewal
We design every surface around the lifecycle stage — and instrument every stage with the metrics that matter.
Marketing site, signup, social proof.
Time- or usage-bound trial, no-card optional.
Guided setup, sample data, success milestones.
Habit forming, weekly active, value moments.
Workflows, integrations, automations, depth.
Invites, seats, roles, departments.
SSO, MSA, security review, custom plan.
QBR, expansion, multi-year, advocacy.
Plays nicely with the rest of your stack
Twenty deep, native integrations on day one — plus a typed REST and GraphQL API for everything else.
AI as a product surface — not a sticker
We embed AI where it changes the user's outcome: in workflows, search, decisions and content. Every output is cited, auditable and permissioned.
In-product copilots scoped to each user's data and permissions.
Forecast churn, revenue, demand and risk with calibrated models.
Next-best-action, upsell, content and workflow suggestions.
Extraction, classification, summaries, structured outputs.
Hybrid lexical + semantic search across your tenant's data.
AI-decided branches, exception handling, escalations.
Triage, draft, summarize, deflect — with full audit trail.
Drafts, summaries, translations — grounded in your data.
Cited answers, freshness scoring, source attribution.
The stack we choose, on purpose
Boring where it matters. Modern where it earns its keep. Picked for predictability, hireability and 5-year horizon.
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Enterprise security, designed in
Security and compliance aren't a Q4 project — they're baked into the architecture, deployment and developer workflow from sprint one.
Role and attribute-based access down to field level.
Standards-based identity for users and machines.
Okta, Azure AD, Google Workspace, JumpCloud, custom IdPs.
TOTP, WebAuthn passkeys, device binding.
AES-256 at rest, TLS 1.3 in transit, customer-managed keys.
Immutable, exportable, queryable, SOC 2 evidence.
Per-tenant, per-route, per-IP. Abuse detection built-in.
RPO ≤ 5 min, RTO ≤ 30 min, tested quarterly.
Datadog, New Relic, ELK, Sentry — centralized alerting.
PITR, cross-region, immutable, restore-tested.
SOC 2, ISO 27001, HIPAA, GDPR, PCI-DSS aligned.
Annual third-party penetration tests, public scope.
Built for the day after product-market fit
The architecture choices we make on day one are the ones you'll still trust at 10M users.
Multi-AZ, multi-region, failover under 30s.
Stateless services scale linearly with traffic.
Predictive scaling on CPU, RPS and queue depth.
Edge caching, image optimization, Brotli, HTTP/3.
Redis, CDN, application and query caches.
Layer-7 routing, sticky regions, canary deploys.
Read replicas, logical replication, sharding.
Multi-region active-active or warm-standby.
Vaulta · subscription billing for vertical SaaS
A multi-tenant billing platform built for a B2B vertical SaaS expanding from $0 to $8.4M ARR in 18 months.
A vertical SaaS outgrew their off-the-shelf billing — Stripe alone couldn't model their seat + usage + addons + enterprise contracts, and finance was rebuilding MRR in spreadsheets.
A custom billing engine on top of Stripe primitives — modeled plans, addons, metered usage, enterprise contracts, proration, dunning, taxes and revenue recognition into one ledger with a finance-grade audit trail.
- Next.js + Node.js services on AWS ECS, multi-region
- PostgreSQL with logical replication, Redis cache layer
- Stripe Billing + Tax, event-driven webhooks, idempotent
- OpenSearch + RAG knowledge base for support copilots
A native experience on every device.
Modern SaaS lives on phones as much as laptops. We ship native iOS and Android clients with offline-first sync, push notifications, biometric login and full feature parity with the web app.
- Offline-first sync with conflict resolution
- Push notifications and deep linking
- Biometric login (Face ID, fingerprint, passkeys)
- In-app purchases and subscription management
- Real-time updates over WebSockets
Engage the way that fits your stage
Six shapes of engagement. Pick one — switch later as the product evolves.
Fixed-price MVP — auth, multi-tenancy, billing, core flows, one-region deploy.
Beyond MVP — marketing site, onboarding, integrations, AI features, observability.
Multi-region, SSO, audit, custom contracts, security review, on-prem options.
A full product engineering squad embedded with your product owner.
Multi-year roadmap ownership, joint planning, sprint-cadence delivery.
Replatform legacy SaaS — monolith → services, on-prem → cloud, single → multi-tenant.
A product engineering bench, not a body shop
Twelve reasons our clients renew — and why most of our work comes from referrals.
Built for the cloud from the first commit, not retrofitted into it.
Decades of combined experience shipping billing engines that finance teams trust.
SOC 2 / ISO / HIPAA / PCI-aligned from day one, not after the first big customer asks.
Bounded contexts, strict typing, comprehensive tests — a codebase you can hire into.
AI built into core surfaces — search, automation, decisions — with cited outputs.
Product-grade interfaces designed like Linear, Notion and Stripe, not like internal tools.
Every surface exposed via a typed, versioned, documented API. Webhooks everywhere.
p95 budgets, performance regression tests, edge caching, image and bundle pipelines.
Senior QA engineers, automated regression, exploratory testing every release.
Trunk-based development, feature flags, multiple deploys per day with safe rollback.
Engineers across US, EU and APAC for follow-the-sun delivery and incident response.
We stay through v2, v5 and v10 — the roadmap is the relationship.
The SaaS playbook, written down
Six in-depth pieces our engineering and product team uses with every new SaaS engagement.
What to build, what to skip, and how to ship a credible MVP in 12 weeks.
Per-seat vs flat vs usage vs hybrid — and how to model it correctly in Stripe.
When each model wins, and how to migrate between them without rewriting the product.
From 1k to 1M users — the inflection points, the rewrites, the regrets and the wins.
Where AI actually changes the user's outcome — and where it's a sticker.
Plan structures that fuel expansion revenue without confusing customers.
Twenty SaaS questions answered
If yours isn't here, we'll answer it on the discovery call.
Ready to build the next great SaaS platform?
Bring us the idea, the prototype or the legacy product. We'll come back with a phased plan, a fixed-price pilot and a timeline — inside a week.