API Integration & Open Banking Engineering
Banks, fintechs, and platform businesses run on APIs — and every unreliable integration becomes a partner escalation. Hurain Technologies designs, builds, and secures API ecosystems, from open banking connectivity to enterprise API management, so your partner integrations are fast to onboard, well-governed, and secure by default.
Quick answer
Do you work with MuleSoft, Apigee, and WSO2?
Yes, we design, implement, and optimize API management on MuleSoft Anypoint, Apigee, WSO2, and Kong.
Reviewed by Shahnavaz Syed, Founder · Last updated
Overview
What api integration & open banking engineering actually involves
Most organizations don't have an API problem so much as an API governance problem: individual teams built individual endpoints to solve individual problems, and a few years later there's no consistent versioning policy, no single source of truth for what's live, and no unified security model — just a sprawl of integrations that each partner has to be onboarded to separately. The fix usually isn't building more APIs; it's putting a coherent gateway, governance, and developer-experience layer over the ones that already exist, then extending it deliberately going forward.
Open banking adds a regulatory dimension on top of the technical one: account information and payment initiation APIs have to meet specific consent, authentication, and data-minimization standards, and the deadline to comply is rarely negotiable. We build to these standards from the API design stage rather than retrofitting compliance onto an existing integration, which is both faster and produces a cleaner audit trail when a regulator or partner asks to see one.
The Challenge
Problems we see teams struggling with
Slow partner and third-party onboarding
Without a proper API gateway and developer portal, every new integration takes weeks of custom engineering.
Inconsistent API governance
Multiple teams shipping APIs without standards creates versioning chaos and security gaps.
Legacy core system bottlenecks
Monolithic cores can't expose modern, well-documented APIs without a middleware layer.
Open banking compliance pressure
PSD2/open banking-style mandates require secure, standards-compliant APIs with strong consent and auth flows.
No visibility into API usage and abuse patterns
Without centralized gateway analytics, teams often don't know which partners are hitting rate limits, which endpoints are being scraped, or where latency is actually coming from.
Breaking changes disrupting live partner integrations
APIs shipped without a versioning strategy force partners into painful, uncoordinated migrations every time the underlying system changes.
Our Approach
How Hurain Technologies solves it
API strategy & governance
API design standards, versioning policy, and lifecycle governance so every team ships consistent, secure APIs.
Open banking API development
Account information and payment initiation APIs built to open banking standards with OAuth2/OIDC consent flows.
API gateway & management platforms
Implementation and consulting across MuleSoft, Apigee, WSO2, and Kong for traffic management, throttling, and analytics.
Middleware modernization
Wrapping legacy cores with modern, well-documented REST/GraphQL APIs without a risky core rewrite.
Developer portal & partner onboarding
Self-service developer portals with sandbox environments that cut partner integration time from weeks to days.
API security engineering
OAuth2/OIDC, mutual TLS, rate limiting, and API-specific threat protection against abuse and data exfiltration.
Versioning and deprecation strategy
A formal API lifecycle policy that gives partners predictable migration windows instead of surprise breaking changes.
Technology
Tech stack we work with
API Management
Standards
Backend
Security
The gateway is the control point for everything that matters operationally: authentication, rate limiting, request/response transformation, and analytics all pass through it rather than being reimplemented inconsistently inside each backend service. We select between MuleSoft, Apigee, WSO2, and Kong based on your existing infrastructure investment, team familiarity, and specific governance needs — there's rarely a universally correct choice, but there's usually a clearly correct one for a given organization's context.
For open banking specifically, the consent and authentication flow is the part most likely to go wrong: OAuth2/OIDC has to be implemented precisely to the relevant standard's profile, not just 'OAuth2 in general,' and the consent screens themselves need to make clear to end users exactly what data is being shared and with whom. We build these flows to the specific regulatory profile you're operating under and test them against the certification requirements before you submit for approval, rather than discovering a gap during the certification process itself.
Use Cases
Where api integration & open banking engineering gets used
Open banking account information APIs
Standards-compliant account data sharing APIs with proper consent flows for banks and fintechs meeting a regulatory deadline.
Payment initiation APIs
Secure, standards-compliant payment initiation endpoints that let authorized third parties trigger payments on a user's behalf with explicit consent.
Partner and fintech developer portals
Self-service onboarding with sandbox environments that cut partner integration time from weeks to days.
Legacy core API modernization
Wrapping a decades-old core banking or ERP system with modern, well-documented REST or GraphQL APIs without touching the underlying core logic.
Internal microservices API governance
Standardizing versioning, authentication, and documentation across internal teams shipping APIs independently, before sprawl becomes unmanageable.
API monetization platforms
Usage-based billing and tiered access infrastructure for businesses that sell API access as a product.
Proof
Results we've delivered
Client Result
A regional bank needed to launch an open banking API program to meet a regulatory deadline. Hurain Technologies delivered account information and payment initiation APIs on an Apigee gateway with a self-service developer portal, cutting fintech partner onboarding time from 6 weeks to 4 days.
Process
How an engagement runs
- 1
API landscape audit
We map existing integrations, pain points, and governance gaps.
- 2
Gateway & standards design
API management platform selection, standards, and security model defined.
- 3
Build & middleware development
APIs and middleware built, documented, and tested against partner use cases.
- 4
Developer portal launch
Self-service onboarding, sandbox, and documentation published for partners.
- 5
Monitoring & governance handover
Analytics, alerting, and governance processes handed to your internal team.
Engagement Models
How we structure the work
Open banking compliance sprint
A deadline-driven engagement to deliver certified, standards-compliant account information and payment initiation APIs.
Gateway implementation project
Selecting and implementing an API management platform (MuleSoft, Apigee, WSO2, Kong) as the governance layer over existing and future APIs.
Dedicated integration pod
An ongoing team handling partner integrations, middleware development, and API governance as your ecosystem grows.
Developer portal build
A focused engagement to launch a self-service developer portal with sandbox environments for partner onboarding.
Pitfalls
Mistakes we see teams make
Shipping APIs without a versioning policy
Every breaking change becomes a partner fire drill instead of a scheduled, communicated migration when there's no formal deprecation policy from day one.
Treating the developer portal as an afterthought
Partners judge integration difficulty by the documentation and sandbox quality as much as the API itself; a poor portal adds weeks to every onboarding.
Underestimating open banking consent UX requirements
Consent screens that are technically compliant but confusing to end users create support burden and can still fail a certification review focused on user comprehension.
No rate limiting until abuse actually happens
APIs launched without throttling are commonly discovered by scrapers and abusive clients before legitimate partners even find them.
Glossary
Key terms explained
- API gateway
- A control layer that sits in front of backend services, handling authentication, rate limiting, and routing for every request before it reaches your application logic.
- OAuth2 / OIDC
- Industry-standard protocols for delegated authorization and identity verification, used to let a user grant a third-party application limited access without sharing their password.
- Open banking
- A regulatory and technical framework requiring banks to expose standardized APIs for account data and payment initiation to authorized third parties, with explicit customer consent.
- Rate limiting
- Restricting how many requests a client can make in a given time window, used to protect backend systems from abuse or accidental overload.
- Webhook
- A callback mechanism where a service pushes event notifications to a URL you provide, rather than requiring you to repeatedly poll for updates.
FAQ
API Integration Services — frequently asked questions
Do you work with MuleSoft, Apigee, and WSO2?
Can you build open banking APIs for our institution?
How do you speed up partner API onboarding?
Can you modernize our legacy core without a full rewrite?
How do you handle API versioning so partner integrations don't break?
Can you help us pass an open banking certification review?
Do you provide ongoing API governance, or just the initial build?
Do you build the complete api integration services solution, or only integrate with what we already use?
We are not sure about our budget yet. Can you still help?
Markets We Cover
API Integration Services by country
Local regulatory context and delivery details for api integration services in each market we serve.
Live Demos
A selection of platforms we've designed and built
Real, working builds across fintech, compliance, healthcare, and commerce — the same engineering team would build your api integration services project.
Nexa
SaaS-style product dashboard and workflow UI for a fintech platform.
Open live demoAML Compliance Suite
Anti-money-laundering compliance and case-monitoring suite.
Open live demoDebt Management
Debt management and collections tracking platform.
Open live demoUMARSOB Data
Android VTU/data-reseller platform with wallet, agent/referral system, and admin panel.
Open live demoHospital Management
Hospital/clinic management system covering patient records, appointments, staff, and billing.
Open live demoDMI CHW App
Offline-first Community Health Worker counseling app with a central management platform, built for an NGO client.
Open live demoHomemakers Pro
Enterprise operations system for a domestic staffing agency covering bookings, staff, and client management.
Open live demoE-Commerce (Multi-Locale)
E-commerce storefront demo with multi-language, locale-based support.
Open live demoMars
Legal web application prototype.
Open live demoBusiness value
What API Integration & Open Banking Engineering does for your business
Benefits for your company
- Systems that talk to each other. Banking, ERP, CRM and partner systems exchange data through governed APIs instead of manual exports and spreadsheets.
- Faster partner onboarding. A developer portal, sandbox and clear documentation cut partner integration time from weeks to days.
- Compliance with open-banking rules. Consent flows, security standards and logging that regulators and bank partners expect.
How it can earn or save money
- API monetisation. Usage-based or tiered API plans turn internal data and capabilities into a paid product.
- Partner-driven revenue. Easier integration brings in more partners, resellers and embedded-finance customers.
- Operational savings. Removing manual data handling frees staff time and reduces costly errors.
Illustrative revenue and saving lines, not guaranteed results: outcomes depend on your market, licences and execution.
How we work
How we deliver API Integration Services
Every api integration services engagement follows the same staged, quality-gated process — shaped around your requirements. You see progress every day, review it every week, and give written sign-off at every milestone before any payment is due.
- 01
Discover
Scope signed off- Integration workshops
- Partner & system inventory
- Security & consent scoping
- Signed scope
- 02
Design
Contracts frozen- OpenAPI contracts
- Auth design (OAuth2 / mTLS)
- Rate limits & versioning
- Error model
- 03
Build
Sandbox passed- API & SDK sprints
- Partner sandbox
- Contract tests
- Demo every sprint
- 04
Secure & Test
Partner UAT done- OWASP API checks
- Contract & load tests
- Consent-flow tests
- Partner UAT
- 05
Deploy
Gateway live- API gateway rollout
- Developer portal live
- Keys & monitoring
- Go-live checklist
- 06
Handover
Docs delivered- Role-based sessions
- Recorded walkthroughs
- Admin & ops runbooks
- Documentation handover
- 07
Support
SLA active- Dedicated engineer
- SLA helpdesk
- Patches & upgrades
- Quarterly reviews
Client sign-off at every milestone — you approve the working result before you pay.
You always know what was done today — and what happens next
A written daily update, a weekly work overview and a live demo every sprint — so there are no surprises at milestone time.
Every working day
- What was completed today
- What is planned for tomorrow
- Blockers and decisions needed from you
- Links to builds you can try
Every Friday, with a live call in your business hours
- Features completed and demo recordings
- Progress against the current milestone
- Risks, open questions and change requests
- Plan and priorities for next week
End of every sprint and milestone
- Working software demonstrated live
- Your feedback captured in the backlog
- Quality-gate checklist shared
- Written sign-off before any payment
Payment plan
Pay only for work you have accepted
Milestones are customised to your requirements — six or more is typical, and delivery time is agreed around your scope. Every payment after the advance is released only after you have seen the working result and given written sign-off. Here is an example plan:
| Payment | Milestone & acceptance | Share |
|---|---|---|
| Advance | Contract signing Signed contract; integration workshops and partner inventory. | 10% |
| Milestone 1 | API contracts approved OpenAPI contracts, auth and versioning signed off. | 15% |
| Milestone 2 | Sandbox live Partner sandbox and first endpoints demonstrated. | 15% |
| Milestone 3 | APIs & SDKs complete All endpoints, SDKs and consent flows working. | 15% |
| Milestone 4 | Security & load tests OWASP API checks and load tests passed. | 15% |
| Milestone 5 | Partner UAT Integration partners accept the APIs. | 15% |
| Milestone 6 | Gateway & portal live Production gateway, developer portal and handover. | 15% |
| Total | 100% | |
- Number of milestones and splits set around your scope
- Every milestone is a working, demonstrated result
- No payment is due until you sign off
Warranty & annual support
Protected after launch — warranty and annual support for your API Integration Services project
Go-live is where your api integration services product starts earning — so we stay accountable for it. Every project includes a free 90-day defect warranty. After that, the same team that built it keeps it secure, updated and running on a fixed annual fee agreed up front — no open-ended hourly billing, no surprise invoices.
Included free
90-day warranty
Any defect found in the first 90 days after go-live is fixed free of charge.
- Every delivered feature covered
- Fixes tested and deployed to production
- Same engineers who built it
Fixed-cost annual package
30% of project cost
per year for Annual Support & Maintenance, with a dedicated developer assigned to your api integration services platform. A fixed price, known in advance.
| Service | Included in the annual package |
|---|---|
| Dedicated developer | One named developer assigned to your product for fixes, enhancements and optimisation. |
| Bug fixes & security patches | Critical issues resolved within 24 hours; standard issues within 5 business days. |
| Upgrades & new releases | Framework, library and platform updates plus new versions of what we built, at no additional cost. |
| Helpdesk | Email and phone support for your team and administrators; 4-hour response for critical issues. |
| Backup monitoring | Daily backup checks and a quarterly restore test. |
| Security review | Periodic audit-trail review and security configuration check. |
| Partner API changes | Third-party API deprecations tracked and integrations updated before cut-off dates. |
| Uptime & error monitoring | Error rates, latency and rate limits watched with alerts. |
Source code & IP ownership
100% of the source code and IP is owned by you
For every custom api integration services project, upon full and final payment the complete source code and intellectual property are transferred to you — so you can host, maintain and enhance the system with any developer.
- API, gateway and SDK source code
- OpenAPI specifications and developer-portal content
- Partner credentials and keys in your name
- Complete Git repository with full commit history
- Database schemas, migrations and seed data
- Configuration, CI/CD and deployment scripts
- API documentation and a deployment guide
No lock-in
No forced upgrades
No subscription trap
Your code lives in your own repository from the first commit.
Continuous enhancement
Launch is just the beginning — keep shipping with your own dedicated team
Your api integration services platform should get better every month, not stand still after go-live. Start with one dedicated developer working on your priorities across apps, dashboards and backend — and grow to a full team of developers and support members whenever your roadmap demands it.
Dedicated team, your way
From one developer to a full team
Pricing is based on the team members you need — tell us your requirements and we will quote your team.
- Start any time after launch
- Hire developers as you need them
- Scale up, scale down or pause
What your team can take on after launch
- New endpoints, SDKs and partner integrations
- Developer-portal and documentation improvements
- Webhooks, reporting and workflow automation
Need more hands? Add developers and support members as your requirements grow
Start with one person and add only the roles your api integration services roadmap needs — each is quoted to your requirements.
Development team
Backend / API developer
Designs and builds new endpoints and API versions.
Integration engineer
Connects partners and third-party systems to your platform.
SDK developer
Maintains client SDKs so partners integrate faster.
QA engineer
Writes and runs manual and automated tests before every release.
DevOps engineer
Keeps pipelines, environments and deployments fast and reliable.
Support team
L1 helpdesk support executive
First contact for your users and staff — logs, triages and resolves common issues.
L2 technical support engineer
Investigates bugs, data issues and integrations, and escalates to developers with full context.
Integration & partner support engineer
Helps partners onboard and debug their integrations.
API monitoring support
Watches error rates and latency and acts on alerts.
Our Approach
Our approach to development methodologies
Our approach to custom software engineering draws on a range of methodologies, each selected to match the needs of your API integration services project.
Agile Scrum
Best for: Evolving products
Two-week sprints with a working demo at the end of each, so API integration services priorities can change as you learn from users.
Kanban
Best for: Continuous delivery & support
A visual flow of small tasks with work-in-progress limits — ideal for maintenance, integrations and post-launch improvements.
Fixed-scope (Waterfall-style)
Best for: Well-specified builds
Requirements signed off up front with a fixed timeline and price — best when scope is clear and change is unlikely.
Lean MVP
Best for: New ventures
Build the smallest API integration services release that proves demand, measure it with real users, then invest where the data points.
DevOps & CI/CD
Best for: Every project
Automated tests, infrastructure-as-code and push-button deployments so releases are frequent, reversible and boring.
Security-by-design (DevSecOps)
Best for: Regulated & high-value systems
Threat modelling, dependency scanning and code review built into each sprint rather than a pen test at the end.
Why we're different
What sets Hurain Technologies apart
Plenty of agencies can build API integration services. Here is what sets us apart for clients worldwide.
Engineering depth, not a reseller
Your API integration services project is designed and built by our own in-house engineers — no hidden subcontracting chain between you and the people writing code.
Built for your market, not a template
Payments, tax, language and data-protection requirements for your target market are part of the design from day one instead of retrofitted after launch.
Transparent, senior-led delivery
A named project lead, a shared backlog, fortnightly demos and direct Slack access to the engineers — you always know what is being built and why.
Cost advantage without cutting corners
Delivering from India gives clients worldwide senior engineering at a fraction of typical onshore agency rates, with the same code-review, testing and security standards.
You own everything
Source code lives in your repository from the first commit; IP, infrastructure accounts and documentation transfer to you in full.
We stay after launch
Monitoring, updates and a support SLA mean the team that built your product is the team that keeps it running.
Flexible engagement models
How we work with API integration services clients worldwide
Ways to work together, depending on how your team and roadmap are set up.
Dedicated Development Team
An extended team of API integration services engineers, QA and architects working exclusively on your product, managed day-to-day by you with our engineering leadership behind them.
Best for: Long-term products and evolving roadmaps
Fixed-Cost Delivery
A clearly scoped API integration services build with a defined timeline and price — ideal for a well-specified MVP, integration or launch product.
Best for: MVPs and clearly defined projects
Hybrid Engagement
Keep product and regulatory decisions close to your team while our specialists handle deep engineering remotely, with workshops or on-site visits at key milestones.
Best for: Enterprises and regulated businesses
Why businesses choose us
Why businesses choose Hurain Technologies
16+ years of engineering depth
Custom software engineering with in-house teams across web, mobile, cloud, AI, payments and blockchain.
Security-first by default
Encryption, least-privilege access, audit logs — and MPC/HSM custody and audited smart contracts where money is on-chain — designed in, not retrofitted.
Regulatory-aware architecture
Designed with your target market's regulatory direction in mind and built alongside your licensed local legal counsel.
Direct access, no layers
Direct Slack or Teams access to your development team during the build, and the same people for post-launch support.
Business benefits
What you gain
Faster time to market
An experienced API integration services team with proven components means your first release ships in weeks, not quarters.
Security-first architecture
Secure from day one, rather than patched after an audit or incident.
Aligned compliance groundwork
Controls, logs and data handling built around your target market's requirements so reviews go faster.
Lower total cost of ownership
Clean, documented, tested code that your own team can maintain — plus post-launch monitoring and support.
What happens next
From your API integration services enquiry to a working demo — in about a day
- 01Within 10 minutes
We respond to your enquiry
Send your API integration services enquiry by form, email or WhatsApp — a few lines is enough. Our team replies within 10 minutes, any day, any time, to set up a meeting at a time that suits you.
- 02Requirements meeting
We understand your requirements
In a focused meeting we go deep on your users, features, integrations, timeline and budget — so we build exactly what your business needs. NDAs signed on request.
- 03Within 24 hours
You see a demo of your API integration services
Within 24 hours of our meeting we prepare and share a demo — so you see your API integration services taking shape before you commit to anything.
- 04As per your budget
We share a tailored proposal
A clear proposal for your API integration services project with scope, milestones, team and timeline — shaped around your budget, with no hidden costs and no obligation.
Available 24×7 — three 8-hour shifts, every day
Ready to start your api integration & open banking engineering project?
Get a response within 10 minutes, a demo within 24 hours of our meeting, and a proposal as per your budget.