Custom Software Development
Business applications, SaaS products and integrations engineered to last.
When off-the-shelf software forces your team into workarounds, or your internal team lacks capacity, we design, deliver and maintain the software your business needs. That includes customer portals, B2B SaaS products, integrations and internal platforms, with clean code, automated tests and full documentation.
What we start from
- Product objectives
- Existing systems
- User workflows
- 1Architect
- 2Engineer
- 3Release
- Production app
- Documented APIs
- Code in your repo
What you own
When standard software or a busy team holds you back.
Core work runs on workarounds.
Your sales or fulfillment process has outgrown generic tools, so people fall back on spreadsheets and make mistakes.
The product roadmap is stuck.
Your internal team is absorbed by day-to-day maintenance, so features and integrations that bring in revenue keep slipping.
Old systems slow every release.
Old code and undocumented dependencies turn small changes into risky, multi-week projects.
What we deliver.
Business applications and portals
Client portals, internal platforms and dashboards designed around how your business operates.
Learn moreB2B SaaS and MVPs
New software products, launched quickly on a scalable foundation that grows without a rewrite.
APIs and integrations
Reliable two-way connections between your ERP, CRM, logistics, billing and in-house databases.
E-commerce and logistics applications
Custom Shopify apps, checkout extensions, delivery pricing and warehouse workflows.
Modernizing old systems
Step-by-step updates of important old systems to modern TypeScript, React and cloud hosting.
Tools we work with
- TypeScript
- Node.js
- React
- Astro
- PostgreSQL
- AWS
- Cloudflare
- Shopify
- Docker
A predictable path from spec to launch.
- 01
Discovery and plan
We define what it must do, the data model, security rules and a milestone plan.
- 02
Iterative delivery
We release tested, working increments in short cycles and review them with you live.
- 03
Launch
Load tests, automated deployment, monitoring and a full handover guide.
- 04
Ongoing care
Optional ongoing development, monitoring and new features.
What this looks like in practice.
An AI dining and route-planning platform with paid member access, delivered for LeGuideline.
Read case study 2 weeksFrom specification to a live Shopify fulfillment application for Gently.
Read case study 1,000+Guests per event managed on a custom guest-management platform for Prologue.
Read case studyCoderstein are hardworking and always go above and beyond! I have been very happy with the results of the projects they worked on and will continue to use their services in the future.
John ScottSVP of Technology, GentlyFixed scope. Proven delivery. No surprises.
- Discovery
Discovery and plan
Requirements, system design, database model, clickable wireframes and a fixed delivery proposal.
Book discovery - Project
Fixed-scope delivery
End-to-end delivery, quality assurance, deployment and full IP transfer, on an agreed milestone schedule.
Scope a project - Team
Dedicated delivery team
Experienced specialists who integrate with your product team, code base and planning cadence.
Discuss capacity
Software development questions.
Which technologies do you use?
Mostly modern, type-safe tools: TypeScript, Node.js, React, Astro and PostgreSQL, hosted on AWS or Cloudflare. When we extend an existing product, we follow your current setup and coding standards.
Who owns the code and IP?
You own all the code, settings and documentation. If you prefer, we work in your own GitHub or GitLab and cloud accounts from day one.
Can you work alongside our in-house team?
Yes. We often own one module, integration or part of the backlog, and follow your code review, deployment and security rules.
How do you avoid delays and keep quality high?
Every engagement has a dedicated delivery lead. We use code reviews, automated tests, a staging environment and regular live demos, so you can see and check progress at every step.
Related services.
Technology that strengthens your competitive position.
Book a consultation to review your requirements, approach and timeline.