APIs
Public or private APIs with clear contracts, versioning, and predictable error behavior.
- REST / GraphQL (case-by-case)
- Rate limits and abuse controls
- Auth, roles, and permissions
Backend Development
Reliable systems behind the scenes.
Secure. Scalable. Maintainable.
SEMLIN builds backend systems that match real business logic: clear APIs, stable data, and architecture that doesn’t collapse when requirements evolve.
- API-first
- Security-minded
- Performance
- Observability
StablePredictable behavior under load
SecureAccess control & safe defaults
ClearReadable code & documentation
Overview
Backend work is where complexity tends to hide: data consistency, permissions, integrations, performance, and operational stability. We build systems that are easy to reason about, easy to extend, and difficult to break.
Whether you need a clean API, an internal tool, or a scalable platform foundation — we can help.
Use cases
Practical backend systems built around your workflows.
Admin panels
Operational tooling that makes support and internal workflows faster.
- Role-based access
- Audit logs and actions
- Exports and reporting
Automation
Workflows that remove repetitive tasks and reduce human error.
- Scheduled jobs
- Event-driven processing
- Queue-based workloads
Integrations
Payments, analytics, CRMs, email, webhooks, and external systems that “just work”.
- Webhook ingestion
- Retry + idempotency
- Operational visibility
Architecture & performance
We design for your real traffic profile — not hypothetical peak numbers.
Clear boundaries
Well-defined services and responsibilities prevent systems from becoming unmaintainable.
- Separation of concerns
- Consistent API contracts
- Simple deployment story
Performance strategy
We optimize the “expensive” paths: queries, caching, serialization, and background workloads.
- Caching where it pays off
- Query optimization
- Queues for heavy tasks
Observability
If you can’t see it, you can’t fix it. We implement logs and metrics that answer real operational questions.
- Structured logs
- Metrics and alerting hooks
- Traceability for incidents
Security & scalability
Safe defaults, predictable access, and controlled growth.
Security foundations
- Input validation & safe parsing
- Auth & authorization (roles/permissions)
- Rate limiting & abuse controls
- Secure secrets handling
Scalability planning
We scale intentionally — avoiding premature complexity while keeping paths open.
- Horizontal scaling readiness
- Background processing strategy
- Storage and caching design
Operational stability
Stability is a feature. We design for recovery, retries, and clarity during failures.
- Idempotency for webhooks
- Retry policies
- Safe migrations
Databases & storage
Chosen by access patterns and correctness requirements.
Relational data
When correctness matters, relational databases are often the best foundation.
- PostgreSQL / MySQL (typical choices)
- Schema design & migrations
- Indexes and query tuning
Flexible storage
When you need flexible data shapes or specialized workloads, we pick appropriate tools.
- Document / key-value stores (case-by-case)
- Caches (e.g., Redis patterns)
- Queue-backed workflows
Files & object storage
For uploads and large assets, object storage is usually the right approach.
- Signed URLs & access rules
- Image processing pipelines
- Lifecycle and retention
Example systems we build
Concrete deliverables, not buzzwords.
API backends for apps
User accounts, permissions, data models, and endpoints that stay stable as the product grows.
Internal tooling
Admin dashboards, support tools, and automation that reduce operational overhead.
Billing and payments
Subscriptions, invoices, usage-based limits, and integrations with Stripe/PayPal/crypto where needed.
Talk to SEMLIN →Need a backend you can trust?
Describe your product, users, and constraints — we’ll propose an architecture and a realistic scope.