Backend services
Backend code carries the application logic that a product depends on: data access, workflows, permissions, background processes and communication with external services.
Product Engineering
Engineering the systems behind your product.
We build backend services, APIs, integrations and application foundations that connect your web product with the workflows and systems your business depends on.
What we engineer
The parts of a product users do not always see.
Modern web products depend on systems beneath the interface. We engineer the logic, connections and data flows that make those products useful in practice.
APIs and integrations
We connect frontend applications with internal systems, third-party services and existing business software through practical APIs, webhooks and data synchronization where the systems support it.
Authentication and user systems
Account access, authentication, authorization, roles, permissions and session handling are designed around what the product needs its users to do.
Data and business workflows
Many products are structured around business data, states, rules and actions. We model the system around how the business actually operates rather than treating the database as an isolated technical layer.
Beyond the frontend
A working interface is only one part of the product.
A customer portal, for example, may need to authenticate a user, retrieve account data, submit a request, update another system, trigger a background workflow and return the result to the interface.
Explore our web development work- 01Frontend
- 02API
- 03Business logic
- 04Data
- 05External systems
This is a general example of how a product’s pieces can work together. The actual boundaries depend on the product and its existing systems.
Integrations
New software rarely starts from an empty system.
We can build new product functionality around existing systems when that is the practical path. The approach depends on available APIs, data ownership, authentication, technical constraints and expected workflows.
Existing APIs
Use the interfaces already exposed by the systems the product depends on.
Databases and business systems
Understand data ownership, access patterns and the constraints of current systems.
CRM and operational platforms
Connect product actions to the business workflows that follow them.
Authentication providers
Work with the account and identity flows available to the product.
Analytics systems
Pass the right product events and context into the systems used to understand behaviour.
Third-party services
Add external services where their APIs, terms and reliability fit the required workflow.
Technical foundations
Software should become easier to change, not harder.
Good architecture makes the next product decision clearer. We focus on boundaries, interfaces and the level of complexity the product actually needs.
Clear boundaries
Keep responsibilities between frontend, backend, data and integrations understandable.
Explicit interfaces
Use predictable API contracts and data structures so different parts of the product can evolve safely.
Practical architecture
Choose the architecture for the actual product and avoid unnecessary infrastructure and complexity.
Designed for change
Make room for new features, integrations and workflows without repeatedly rebuilding the product.
Reliability and operations
Production starts where development stops.
Before and around launch, engineering decisions should account for error handling, logging, monitoring readiness, environment configuration, database migrations, deployment workflows, backups where relevant and graceful handling of external service failures.
When the product is live, Leanda can continue with the deployment, infrastructure and ongoing technical work covered by Ongoing Operations on the homepage.
Working with an existing product
Already have a product? We do not need to start over.
A mature product usually contains decisions worth keeping. We first understand the current architecture, frontend and backend, APIs, databases, deployment setup, known technical problems and upcoming requirements before deciding what needs to change.
- Extend what is working
- Refactor a difficult boundary
- Replace one component
- Introduce a new service
- Rebuild only where necessary
How we work
From requirements to working systems.
We keep the engineering scope reviewable as the product moves from business requirements to connected, operating software.
Discover
Understand business workflows, existing systems, users and technical constraints.
Define
Map data flows, system boundaries, APIs and implementation requirements.
Build
Implement backend services, APIs and integrations in reviewable stages.
Launch & operate
Deploy, monitor and continue improving the system as the product evolves.
A practical fit
When a product needs more than frontend development.
Product engineering is useful when the interface is only one part of the work that needs to happen.
- 01A web application needs its own backend
- 02Multiple systems need to exchange data
- 03Existing APIs need to connect to a new frontend
- 04A product requires accounts, roles or permissions
- 05Manual business workflows need software support
- 06An existing backend has become difficult to extend
- 07A new product must work with existing infrastructure
- 08A website is becoming a real application
Connected disciplines
One product, connected disciplines.
Product Engineering often sits between what users interact with and the systems the business already relies on. Depending on the project, Leanda can work across the product lifecycle rather than handing frontend, backend and deployment between unrelated teams.
- Product Design
- Web Development
- Product Engineering
- Ongoing Operations
Building for international markets?
Explore going globalInternational products add technical context.
Multilingual interfaces, infrastructure, integrations and search visibility can all shape an international product. We also help Chinese businesses design and build digital products for international customers.
FAQ
Questions about product engineering.
What is product engineering?
Product engineering covers the technical systems behind a digital product, including backend services, APIs, integrations, data flows and application architecture.
What is the difference between web development and product engineering?
Web development focuses primarily on the interfaces and web applications users interact with. Product engineering covers the backend systems, business logic, APIs and integrations that support those experiences. The terms overlap in practice, so we use them to describe the part of the product each engagement needs.
Can you work with our existing backend?
Yes, depending on its architecture and available interfaces. The first step is understanding the existing system before deciding whether to extend, integrate or change it.
Can you build APIs for our frontend or mobile application?
Yes. Leanda can build backend services and APIs used by web or other application clients where appropriate.
Can you integrate with existing business systems?
Yes, where suitable APIs or technical integration methods are available. The exact approach depends on the systems involved.
Do you handle authentication and permissions?
Yes. Product engineering may include authentication, authorization, account systems and application permissions when required by the product.
Can you maintain the system after launch?
Yes. Leanda can remain involved with deployment, maintenance, infrastructure and ongoing engineering after release.
Define the engineering scope
Discuss your projectNeed the systems behind the interface?
Tell us what the product needs to do, what systems already exist and where the current technical constraints are. We can start by defining the architecture and engineering scope.