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We collaborate with client product teams to sketch the business goals, domain-specific needs, and service abstractions before proceeding with API development. We integrate the business use cases in our architectures for more sustainable platforms.
We devise API-first platform strategies that ensure the new features do not disrupt the old ones. We define each API using OpenAPI specification with Swagger documentation. Every time APIs need to be deprecated, we migrate clients to new APIs with utmost care while minimizing upstream risks.
We have experienced teams who can design APIs that manage well-abstracted resources, secure data transactions, and manage data lifecycles. Our built API-first platforms enable a healthy and robust digital ecosystem with the help of data governance.
A digital insurance marketplace needed comprehensive API testing coverage across a complex integration layer connecting carriers, agents, and end consumers through a multi-party quoting and binding workflow. Zymr implemented an API testing suite covering functional validation, contract compliance, performance benchmarking, and security scanning across all marketplace endpoints. The testing framework reduced API-related production incidents by 62 percent in the three months following implementation and provided the carrier partners with the evidence of API quality that their procurement teams required. The automated test suite now runs on every pull request, maintaining quality standards as the marketplace adds new carrier integrations.
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A capital markets firm needed its order execution platform APIs to handle peak trading volume events - market open, macro announcements, volatility spikes - without latency degradation that could affect trade execution quality. Zymr re-architected the execution API layer with connection pooling, circuit breaker patterns, adaptive rate limiting, and horizontal scaling triggers that activated before latency thresholds were breached rather than after. Load testing with simulated peak conditions validated performance at 12x normal volume before the upgrade went live. The platform has since handled multiple major market volatility events without a latency incident.
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A financial services provider digitizing SME invoice lending needed APIs that could connect borrowers, lenders, accounting system integrations, identity verification providers, and payment rails into a coherent loan origination and servicing workflow. Zymr built the full API layer including borrower-facing application APIs, lender underwriting data APIs, Xero and QuickBooks accounting integration connectors, KYC provider webhooks, and payment gateway integration. The digitized platform reduced loan approval time from 5 business days to under 4 hours and increased the lender's capacity to process applications by 8x without adding operations headcount.
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Node.js, Python (FastAPI, Django REST), Java (Spring Boot), Go, TypeScript
Express.js / NestJS, FastAPI, Spring Boot, Apollo Server, gRPC
REST, GraphQL, gRPC, WebSocket, Event-Driven / AsyncAPI, FHIR R4 and HL7
PostgreSQL, MongoDB, Redis, DynamoDB, Elasticsearch
GitHub Actions / GitLab CI, Docker and Kubernetes, Terraform, Kong / AWS API Gateway / Azure APIM, Postman / Newman / k6
API development is the practice of designing, building, testing, documenting, and maintaining Application Programming Interfaces the software contracts that allow different applications, services, and platforms to communicate with each other. Custom API development refers to building APIs tailored to a specific organization's data models, integration requirements, security policies, and performance needs rather than using generic or third-party APIs that were not designed for your specific use case. Well-developed APIs are the foundation of modern software architecture: they enable mobile apps to talk to backends, platforms to integrate with partners, and internal services to exchange data reliably and securely.
Third-party APIs are interfaces built by external vendors, Stripe for payments, Twilio for messaging, Google Maps for location that provide standardized access to a service those vendors operate. Custom APIs are interfaces you own and build to expose your own data, services, and business logic to your own systems, partners, or customers. Most production applications use both: third-party APIs for commodity capabilities and custom APIs for the business logic and data integration that differentiates your product. Zymr builds custom APIs and integrates third-party APIs into the same architecture, so you get a cohesive integration layer rather than a collection of uncoordinated point-to-point connections.
Custom APIs benefit your business by eliminating the manual processes and data silos that exist because your systems cannot exchange information automatically. A custom API connecting your CRM to your billing platform eliminates manual data entry and the errors it produces. A partner API enabling third-party distribution of your product removes the human coordination overhead from every new partner onboarding. A mobile API with offline-first sync endpoints enables your field workers to operate productively without connectivity. Each of these outcomes has a measurable operational and revenue impact that generic, off-the-shelf integration tools typically cannot match because they were not designed around your specific workflows and data model.
Yes, significantly. Well-designed APIs improve performance in several ways. Response payload optimization returning only the fields a consumer actually needs reduces bandwidth consumption and parsing time on the client. Caching at the API gateway layer serves repeated identical requests from memory rather than executing database queries for every call. Pagination and cursor-based result streaming prevents large data responses from blocking client rendering. Edge deployment of API gateways reduces latency for geographically distributed users by serving requests from distributed infrastructure closer to users.
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