Solution Architect Java / Integration
About this role
Job Summary:
We are seeking a highly skilled and experienced Senior Java Developer with deep expertise in designing and implementing robust integration solutions for the telecommunications and fintech sectors. The ideal candidate will have a strong command of modern Java-based development, API architecture, and security protocols, along with a solid understanding of industry-specific standards such as TM Forum Open APIs and Open Banking frameworks.
Key Responsibilities:
Java Development & API Engineering
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Design, develop, and maintain scalable backend systems and
microservices using Java (Spring Boot, Jakarta EE). - Build and expose RESTful APIs aligned with TM Forum Open APIs (TMF), CAMARA standards, and Open Banking specifications (UK/PSD2).
- Lead the development of API gateway policies (throttling, caching, quota) using platforms such as Apigee, Kong, or MuleSoft.
Security & Identity Integration
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Implement secure authentication and authorization flows using OAuth
2.0, OpenID Connect, and integrate with IdPs like Okta, Azure AD, or Ping Identity.
- Ensure APIs are compliant with Consent Management and data privacy mandates.
Domain Expertise: Telco & Fintech
- Build and integrate Java modules for OSS/BSS systems, SIM lifecycle management, provisioning, and partner APIs in telco ecosystems.
- Develop interfaces for banking platforms including KYC/AML workflows, account aggregation (AIS), and payment initiation (PIS).
- Translate regulatory requirements (e.g., PSD2, GDPR) into compliant technical implementations.
️ Cloud & Architecture
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Design cloud-native or hybrid Java-based solutions in multi-
region/multi-tenant environments. - Work with event-driven architectures, message queues (Kafka, RabbitMQ), and integration platforms (iPaaS).
- Collaborate with architects and DevOps teams to ensure CI/CD, scalability, and fault tolerance.
Collaboration & Documentation:
Deliver high-quality technical documentation, solution blueprints, and developer guides.
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Present solutions to technical and non-technical stakeholders,
participating in sprint planning and reviews.
Key Requirements:
- 8-10 years minimum hands-on Java development experience in large-scale integration projects.
- Proficient in Spring Boot, REST API development, and API gateway patterns.
- Proven industry experience in telecom (OSS/BSS) and/or fintech/banking integration.
- Hands-on experience with OAuth2, OpenID Connect, and API security frameworks.
- Familiarity with compliance requirements like GDPR, PCI-DSS, PSR, and regional data protection laws.
- Experience with cloud platforms (AWS, Azure, GCP) and containerization (Docker, Kubernetes).
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Strong communication and documentation skills.
Company at a glance
For nearly 40 years, Abacus has been offering cutting-edge business solutions helping organisations to transform their visions into realities through a combination of latest business methodologies and technological tools. The business value offered by Abacus has a deep scale, is industry focused and technology driven with a world class delivery capability. We help to transform the businesses of clients who want to be leaders in their industry.
Abacus is founded on one simple belief, that change is the only constant in our world and that as enterprises and individuals, we must all respond to change with vision, courage and integrity. We are passionate about being partners to our clients, as advisers, consultants, technology specialists, systems integrators and outsourcers. For the people at Abacus, fulfillment is seeing our clients transform into truly great organisations.
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