C# Development Services

Precision Engineering. Enterprise-Grade C# Solutions.

Custom .NET and C# applications built for performance, longevity, and the complexity of real business.

Why Choose Us

C# expertise built over two decades

We stay focused on what matters: stable systems, clean integrations, and code built to last.

Enterprise-Ready Architecture

We design C# solutions with scalability and maintainability at the core — not bolted on after the fact, when it costs more to fix.

Deep .NET Ecosystem Fluency

From legacy WCF and WPF applications to modern .NET Core APIs, our engineers move fluidly across the full breadth of the Microsoft stack.

Legacy System Integration

We connect C# backends to IBM Db2, SQL Server, Informix, and bespoke enterprise systems without disrupting the operations that depend on them.

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Our Proven Track Record

Delivering Results

eCommerce
FragranceNet

A 10+ year engagement spanning .NET, C#, SQL Server, and Entity Framework across a global buying platform and marketing engine. Our work on email campaigns and ecommerce features has contributed to returning customer rates 15% above industry average.

Healthcare & Wellness
PatientStudio

C# and Angular staff augmentation for a healthcare practice management platform. Our team resolved a critical production issue with no regressions introduced, earning top marks for communication and follow-through from the client.

our service

C# and .NET Mastery

API design, data, DevOps — we own the stack.

API & Backend Development

We build ASP.NET WebAPI and GraphQL services that integrate cleanly with frontend frameworks, third-party platforms, and legacy data sources.

Cloud & Infrastructure

We deploy C# applications across AWS and Azure using Docker, Terraform, and CI/CD pipelines for reliable, repeatable delivery.

Data & Persistence

SQL Server, PostgreSQL, MySQL, MongoDB — we design data layers that match your domain and hold up under real production load.

UI & Frontend Integration

We pair C# backends with Angular, React, Blazor, and WPF frontends, delivering cohesive full-stack solutions where the seams don't show.

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Why First Factory

The Competitive Difference

For more than 25 years, we have partnered with companies to accelerate go-to-market, improve user outcomes, and deliver tangible business results.

Time Zone Alignment

Costa Rica is 1–2 hours behind Eastern Time. No 12-hour lag, no async-only collaboration. Our teams communicate in real time and attend your standups live.

Security Posture Built In

SOC 2 Type 2 certified. Full MDM device management. Background checks for every hire. Dedicated full-time IT Security Officer. Your IP is protected.

Design + Engineering Under One Roof

Our Costa Rica design team handles UX/UI for client projects, keeping design and development tightly coordinated. There are no handoff gaps or delays iterating.

No Long-Term Lock-In

No minimum contract length on resources. We require written notice to ramp down based on contract terms. You scale based on your needs, not our revenue targets.

Our Guarantee

If  you're unsatisfied — for any reason — at any point during the first 30 days of your project, you can walk away on the spot. No penalties, no questions asked.

25+
Years of experience
175+
Full-time employees
3+ years
Average client tenure
5X
Inc. 5000 Honoree
Engagement Models

Your needs, your way of working.

The right engagement model reduces risk, accelerates delivery, and lowers total cost.

Staff Augmentation

Dedicated full-time engineers who become a natural extension of your team, working in your time zone and integrating into your existing workflows.

Handpicked for ideal fit
Complete transparency
Your team may interview candidates
Engineering Manager oversight
Adapts to your processes
100% committed to you
40hrs per week, billed hourly
30-Day Satisfaction Guarantee
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Scrum Teams

Self-organizing, collaborative teams who deliver high-quality software in two-week sprints with complete transparency and regular stakeholder engagement.

Complete project management
Engineering architecture
Scalable engineering team
QA Resources
Pick & choose Agile ceremonies
Exceptional communication
Seamless integration with your team
Flexibility to pivot as needed
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Milestone-Based Projects

Fixed-price custom development with guaranteed pricing, clearly defined scope, and dedicated project management from concept to post-launch support.

Clear up front scope defined
Fixed price, billed in 3 installments
Fully independent team
Complex challenges tackled first
High transparency & alignment
Structured UAT window
Post-release support
Easy transition to maintenance
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Specialized Services

Assisting you with strategy, implementation, and maintenance

We offer packages that help you achieve business outcomes and provide long-term product support.

Consulting

Expert guidance to evaluate software solutions, compare build vs. buy options, and optimize your development processes through strategic analysis and recommendations.

Service Contracts

Ongoing maintenance and support agreements available as fixed-price annual contracts or hourly arrangements with specific SLAs tailored to your post-launch needs.

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Frequently asked questions

Everything you want to know clearly explained

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