SaaS That Survives Series-A Due Diligence.

Most SaaS engagements at AddWeb land between $25,000 (focused MVP sprint) and $250,000 (full enterprise build with AI, multi-tenant architecture, and compliance review). Discovery-only sprints start at $5,000. We provide a written, line-itemed estimate within 48 hours of a scoping call no boilerplate ranges, no padded contingencies.

A focused, demo-ready SaaS MVP ships in 8 to 12 weeks. A scoped product build (multi-tenant, billing, auth, core features) runs 16 to 24 weeks. We commit to a fixed timeline after a 2-week paid discovery and publish a weekly burndown so you always know what is at risk.

We start from the business model and regulatory requirements, not a default. Shared database with row-level tenant isolation fits high-volume B2C SaaS with thousands of tenants and low per-tenant data. Separate schemas per tenant fit B2B SaaS with mid-volume tenants and moderate data isolation needs. Database-per-tenant fits regulated verticals (healthcare, fintech, government) and enterprise tiers where compliance demands hard isolation. Most of our clients ship on hybrid models shared infrastructure with separate databases for enterprise tier customers.

Stripe Billing and Stripe Tax are our default for US-led SaaS. Paddle for global merchant-of-record handling. Chargebee for complex subscription logic (trials, ramps, usage-based, enterprise contracts). RevenueCat for mobile-first SaaS subscriptions. We have shipped freemium, flat-rate, per-seat, usage-based, hybrid, and custom enterprise pricing models. We also handle dunning, invoice automation, revenue recognition, and SaaS metrics dashboards (MRR, ARR, churn, LTV, CAC) post-launch.

Yes and increasingly, AI is the SKU itself, not a feature bolted on. We ship in-product LLM features, AI agents, predictive analytics, document AI, voice agents, and recommendation engines as part of the core product. Our dedicated AI engineering unit has been running for four years. We also handle the operational layer most agencies skip usage metering for AI features, per-tenant rate limits, cost guards, model fallbacks, and PII redaction.

Backend: Node.js (Express, NestJS), Python (Django, FastAPI), Laravel, .NET Core. Frontend: React, Next.js, Vue, TypeScript. Database: PostgreSQL (with row-level security for multi-tenant), MongoDB, Redis. Cloud: AWS (most common), Azure, GCP. Infra: Terraform, Kubernetes, Docker, GitHub Actions, GitLab CI. Observability: Datadog, Sentry, New Relic. AI: OpenAI, Anthropic, Hugging Face, custom fine-tuned models.

AddWeb holds ISO 9001 and ISO 27001 certifications. For SaaS clients working toward SOC 2 Type II, we deliver SOC 2-aligned architecture (audit logging, access controls, encryption, vendor management, incident response) from day one typically with the customer using Drata, Vanta, or Secureframe for ongoing audit prep. We also support HIPAA-aligned, GDPR-compliant, PCI DSS-aligned, and FedRAMP-adjacent builds depending on vertical.

Yes it is one of our most common engagements, especially for VC-funded founders who outgrew their initial agency or freelance team. We start with a 1 to 2-week code and architecture audit, deliver a written rescue plan with risk ratings, and quote a recovery roadmap. We have inherited SaaS products from prior agencies, freelance teams, no-code platforms (Bubble, Webflow + Memberstack), and in-house teams across Node.js, Python, Laravel, Ruby on Rails, and legacy PHP.

That is the bar we build to. Every AddWeb SaaS engagement ships with documented architecture (system, data, sequence diagrams), test coverage reports, CI/CD pipelines, observability dashboards, infrastructure-as-code, and a security posture document. VCs reviewing Series A diligence packets from our clients consistently cite the engineering documentation as a positive signal — multiple AddWeb-built SaaS products have closed Series A rounds without architecture-related findings.

Yes Remote CTO services are designed for non-technical SaaS founders or early-stage teams without senior engineering leadership. A fractional senior engineer (10 to 20 years experience) owns technical direction, hiring decisions, architecture reviews, security posture, and roadmap input. Most clients use Remote CTO during the pre-seed and seed stages, then transition to a full-time CTO post-Series-A.

Post-launch we offer 24×7, 12×5, or 8×5 SLA-backed maintenance and SRE coverage. We monitor uptime, p95 latency, error budgets, and SaaS health metrics (active users, feature adoption, churn signals). Most clients retain a smaller version of their build team for ongoing feature work this is why our 98 percent retention rate is what it is.

Both. Fixed-price suits well-scoped MVPs and one-off feature releases. A dedicated team (typically 3 to 12 engineers plus PM, designer, and architect) suits ongoing product development where the roadmap evolves week-to-week. Many SaaS clients start fixed-price for the MVP and shift to a dedicated team post-launch for the long-term product roadmap.

You do. All source code, IP, infrastructure, data, and customer relationships transfer to you upon final payment under a US-law-governed Master Services Agreement. We sign a mutual NDA before any scoping call. No hidden licensing fees, no proprietary frameworks you cannot fork, no platform lock-in. Your SaaS belongs to you on day one.

Four ways. First, request our Capabilities Deck and recent SaaS case studies (under NDA where required). Second, read our 74+ verified Clutch reviews. Third, see our G2 recognition among Best Mobile App Development Companies (the same engineering teams build SaaS web + mobile experiences). Fourth, book a 30-minute strategy call where a Solution Architect not a salesperson gives you a free technical perspective on your product idea, multi-tenant approach, or existing codebase. Most decisions get made off that call.