Product Engineering & Custom Development

Ship Software That Scales From Day One

Strategy without execution is just a roadmap gathering dust. After your technical leadership is aligned and operations are automated, the next question is: who builds the product? Fifth Nine’s Product Engineering practice embeds senior engineers alongside your team to design, build, and ship software that is production-grade from day one. According to McKinsey research, companies that invest in engineering excellence ship 4x faster and spend 20% less on maintenance over three years.

What You Get

Full-Stack Web & Mobile Development

• React, Next.js, and TypeScript web applications
• React Native and cross-platform mobile development
• Progressive Web Apps with offline capabilities
• Server-side rendering and static generation for performance

MVP Design & Rapid Prototyping

• Validated MVPs shipped in 4-8 weeks
• User research-informed feature prioritization
• Lean development with fast iteration cycles
• Go-to-market technical readiness

API & Backend Architecture

• RESTful and GraphQL API design
• Microservices and event-driven architectures
• Database design and optimization (PostgreSQL, Redis)
• Third-party integrations and data pipelines

Frontend Engineering

• Design system creation and component libraries
• Accessible, responsive interfaces (WCAG 2.1 AA)
• Performance optimization (Core Web Vitals)
• Animation and interaction design

DevOps, CI/CD & Cloud Infrastructure

• AWS, GCP, and Azure deployment pipelines
• Infrastructure as Code (Terraform, Pulumi)
• Containerization with Docker and Kubernetes
• Monitoring, alerting, and observability

Code Audits & Technical Due Diligence

• Pre-investment technical assessments
• Architecture review and risk analysis
• Security vulnerability scanning
• Technical debt quantification and remediation roadmaps

Our Development Process

1. Scoping

Requirements, constraints, and architecture review in week one. We define success metrics, map dependencies, and align on a delivery timeline before writing a single line of code.

2. Sprint 0

Environment setup, design system foundations, CI/CD pipeline, database schema, and authentication scaffolding. Everything needed to move fast without cutting corners.

3. Iterative Delivery

Two-week sprint cycles with working software every cycle. Continuous deployment, automated testing, and regular stakeholder demos ensure alignment throughout.

4. Handoff or Retention

Complete knowledge transfer with documentation, architecture diagrams, and team training. Or transition to an ongoing retainer for continued development and support.

Why Choose Our Engineering Team?

Senior Engineers, Not Juniors

Every engineer on your project has 8+ years of production experience. We don’t staff projects with junior developers and charge senior rates. Our team has shipped products used by millions across fintech, healthtech, SaaS, and e-commerce.

Embedded, Not Outsourced

We integrate with your team’s tools, processes, and communication channels. Daily standups, shared Slack channels, and PR reviews mean we operate as an extension of your engineering org, not a black box vendor.

Built to Hand Off

Every line of code is written as if your team will maintain it tomorrow. Comprehensive test coverage, clear documentation, typed codebases, and CI/CD pipelines mean you’re never locked in.

Full-Stack Capability

From database schema to production deployment, we handle the entire stack. No gaps, no handoff friction between frontend and backend teams, no finger-pointing when something breaks.

Client Success Story

Case Study: SaaS Platform Build

“Fifth Nine took our product from concept to launch in 12 weeks. Their engineers integrated seamlessly with our team, and the architecture they built has scaled from 100 to 50,000 users without a single rewrite. The codebase they delivered is the cleanest our team has ever worked with.” - James Park, CTO, Meridian Analytics

Key Achievements:

• Time to Launch: 12 weeks from kickoff to production
• User Growth: Scaled to 50,000+ users with zero architectural changes
• Test Coverage: 92% automated test coverage at handoff
• Performance: Sub-200ms API response times at P99
• Uptime: 99.99% since launch

Frequently Asked Questions

What technologies do you work with?

Our core stack is TypeScript, React, Next.js, Node.js, and PostgreSQL. We also work with Python, Go, AWS, GCP, and React Native. We choose technologies based on your requirements, not our preferences.

How do you price projects?

Fixed-scope projects start at $15,000. For ongoing work, retainers start at $8,000/month. We provide detailed estimates after scoping, and we don’t bill for overruns caused by our own estimation errors.

Can you work with our existing codebase?

Yes. Many engagements start with a code audit to assess the current state, followed by targeted improvements or feature development on top of existing code.

What’s the typical team size?

Most projects run with 2-4 engineers. We scale up or down based on sprint requirements. You always get a dedicated technical lead who serves as your single point of contact.

How do you handle project management?

We use your tools (Jira, Linear, Notion) and adapt to your workflow. Every sprint includes planning, daily standups, and a demo/retrospective. You have full visibility into progress at all times.

Do you sign NDAs?

Yes. All engagements include comprehensive NDAs and IP assignment agreements. Your code, your data, your IP.

Ready to Build?

Let’s discuss your product vision and how our engineering team can bring it to life.