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Service

Product engineering

We build custom web and mobile software end to end: architecture, backend, frontend, mobile apps and the pipeline that ships them. One senior team owns the result, not a chain of handoffs.

Discuss your project →
What you get

Outcomes, not hours

  • A first release in weeks, not quarters
  • An architecture your next twenty engineers can work in
  • Test coverage and CI/CD from day one
  • Documentation your team can take over
Scope

What we deliver

Dedicated team or fixed-scope project.

Web applications

SaaS platforms, customer portals, internal tools and admin panels.

Mobile apps

Native iOS and Android or cross-platform with React Native and Flutter.

APIs & integrations

Payments, CRMs, ERPs, identity providers and partner APIs.

Legacy modernisation

Incremental rewrites that keep the business running while we replace the core.

Technology

Typical stack

TypeScriptReactNext.jsNode.jsPythonGoReact NativeSwiftKotlinPostgreSQL
Related work

In practice

All case studies →
FintechSeries A lending startup · 7 months

A lending platform rebuilt without stopping the business

Replaced a fragile monolith with a modular platform while loans kept flowing.

loan decision time, down from 3 days
4 min
more releases per month
12×
hours of downtime during migration
0
Product engineeringCloud & DevOps
HealthcareHealthcare SaaS company · 5 months

Scheduling app that clinics adopted in a week

A patient booking and clinic scheduling product designed with front-desk staff.

no-show rate
−38%
average clinic onboarding
6 days
App Store rating
4.8
Product discovery & designProduct engineering
Other services
→Product discovery & designResearch, prototypes and interfaces people understand on first use.→→Cloud & DevOpsInfrastructure that scales, stays up and costs less.→→AI integrationLLM features wired into the systems you already run.→
Start a project

Have a product to launch?

Tell us what you are building. A senior engineer replies within one business day with questions, a rough budget range and next steps.

Book a call →hello@halyardandkeel.com