Remote Senior Backend Developer for FinTech

@irsolutions

With over a decade of experience in full-stack architecture and high-scale systems, I understand your need for a Remote Senior Backend Developer to design and build scalable backend systems and API integrations for your FinTech platform. My background in high-complexity systems, including handling 1M+ user apps and high-security FinTech projects, directly applies to the challenges of your project. For strategic insight, I recommend implementing a microservices architecture to ensure scalability and flexibility for future growth. In a past project, I successfully built and scaled a Telegram Mini App serving over 1 million users, proving my ability to handle similar levels of complexity. I encourage you to reach out to discuss the roadmap for your project and how I can contribute to its success. Thank you for considering me for this opportunity.

@rohitpatidar001

As a 9+ year backend development specialist, I bring you a wealth of experience developing web and enterprise applications using Java and J2EE technologies. The combination of my strong experience in Java, Spring Boot as well as my expertise in building microservices and RESTful APIs, especially MySQL and MongoDB schema design, have equipped me with the skills to handle the tasks at hand. In addition, my clean data access patterns in Hibernate/JPA will ensure optimized database handling for your project. My competence extends to include API security, validation and automated testing using proven methodologies like JUnit and Mockito. I can also complement your existing team in Docker deployment, CI/CD pipelines using latest frameworks which eases the introduction of new changes and facilitates swift deployment. My experience in AWS based deployments will help manage scalability for your fintech platform, an essential factor for its success. In summary, my broad skill set including experience integrating AI into Java based backends, clean architecture and reliability combined with my ability to work flexibly and diligently in remote team environments makes me an ideal fit for this project. Let's connect to discuss further how I can contribute positively to your project's success. Looking forward to discussing further!

@mrresearcher99

Hi there, I’ve reviewed your Node.js project requirements and would love to help. With 5+ years of experience in backend and API development, I specialize in building fast, scalable, and secure applications using Node.js, Express, and MongoDB. I’ll start with a clear architecture plan, provide regular progress updates, and ensure the solution is well-tested, efficient, and production-ready. Let’s connect to discuss your project in detail — I’m ready to get started! Best, Bhargav Node.js Developer | Backend & API Expert

@corpmember29

I WILL BUILD SECURE, HIGH-PERFORMANCE FINTECH BACKENDS THAT SCALE SEAMLESSLY Hello, your requirement aligns perfectly with my 12+ years of experience in backend engineering, API integrations, and scalable FinTech systems. I’ve worked extensively with Java, Spring Boot, payment gateways, and third-party integrations including wallets and telecom APIs. Approach: I will design robust backend services using Java + Spring Boot, ensuring clean architecture, scalability, and security. APIs (REST/SOAP) will be optimized for performance and reliability, with seamless integrations to mobile operators, EMIs, and payment providers. Core delivery: Scalable backend services (Spring Boot microservices) REST & SOAP API development + integratio Oracle DB design, optimization & migrations Secure transactions (auth, encryption, compliance-ready) eployment, UAT, and production release management API documentation & system monitoring Workflow: modular development → integration → testing (UAT) → deployment → optimization. Why me: Proven experience in FinTech platforms, real-time transaction systems, and API-heavy architectures. I ensure clean code, fast delivery, and long-term maintainability. I can also support scaling via offshore resources if needed. I’d love to discuss your platform and start immediately.

@amirmujtaba92786

Hi, I am an Experienced Full Stack Developer. I can provide services related to Backend: Java, Spring boot, Hibernate, JPA, Maven/Gradle REST API development/integration 3rd party integration AI: LangChain, LLM, RAG, Agent, Tool Chatbot, Voicebot OpenAI, Gemini, HuggingFace Python, FastAPI, Flask Frontend: Angular, Angular Material Streamlit React JS HTML, CSS, Bootstrap Graphs/Charts Tailwind CSS Theme/Template integration Google maps Database: MSSQL Server, MySQL, PostgreSQL, Oracle, mongodb, Sql/Nosql Other: AWS Payment Gateway Integration Docker etc. Please inbox for more details and discussion about project, timeline and budget etc., thank you. Best regards Amir

@OutsourceMan

⭐⭐⭐⭐⭐ • Proposal for Remote Senior Backend Developer (FinTech / API Integration) • Dear Valuable Client, CnELIndia proposes our expert team to design and build scalable backend systems for your FinTech platform using Java Spring Boot. • We match all requirements: strong Java/J2EE/JSP/Spring Boot experience, REST/SOAP API development, third-party integrations (mobile operators, e-wallets, EMIs, payment providers), Oracle database design/optimization/migrations, security, performance, and remote independent delivery. • Our FinTech specialists have successfully supported mobile money platforms with UAT, deployments, and API documentation. • Steps CnELIndia team will follow for successful completion: • Step 1: Kickoff call to review your current systems and define scope. • Step 2: Architect and develop backend services with Spring Boot integrations. • Step 3: Implement Oracle optimizations, API connections, and security enhancements. • Step 4: Conduct full testing, UAT support, production deployment, and documentation. • Step 5: Provide post-launch maintenance and flexible long-term collaboration. • We guarantee timely, high-quality delivery with zero placeholders in execution. Ready to start immediately.

@ykarora26

With extensive expertise in Java and Spring Boot backend development, along with a solid background in API integration and system design, I am well-suited to take on the role of Remote Senior Backend Developer for your FinTech project. Could you share more about the specific third-party systems that require integration to better tailor the development approach? Regards, Yogesh Kumar

@toriquldev123

Hello Dear! Greetings from Toriqul Global Solutions! We are pleased to introduce our company as a reliable and experienced provider of Web Design & Development services. Founded and led by Engineer Toriqul Islam, a B.Sc. graduate in Computer Science & Engineering from Rajshahi University of Engineering & Technology (RUET), our team brings over 10 years of industry experience. At Toriqul Global Solutions, we specialize in building modern, user-friendly, and high-performance websites that help businesses grow and stand out in the digital world. Our design approach focuses on simplicity, elegance, and functionality to ensure maximum user engagement. I have some question-- 1. What is the first integration priority (e-wallets, mobile operators, or payment gateway) for the initial phase? 2. Do you already have existing APIs/system architecture, or is this a greenfield backend build? Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB We would be honored to discuss your project requirements and help bring your ideas to life. Thank you for your time and consideration. Warm Regards, Toriqul Global Solutions

@SmartCodeDev

Hello, I can support your FinTech platform as a senior backend developer with strong experience in Java and Spring Boot, building scalable services and secure API integrations. I have worked on REST and SOAP APIs, third party integrations with payment providers and mobile systems, and optimized relational databases including Oracle. I focus on clean architecture, performance, and security to ensure reliable backend systems that can scale with growing transaction loads. I am comfortable handling deployments, testing cycles, and maintaining clear technical documentation while working independently in a remote setup. I am available for both project based work and long term collaboration and can start immediately.

@Ekarthaan

Hi Mohammad Qasim B., Last week I did a similar project and I am confident to handle this really well. My Questions. 1) Which third‑party providers are in scope and what protocols do they use (REST, SOAP, ISO 8583)? Do you have sandbox creds and tech specs? 2) What security/compliance must we meet (PCI DSS, mTLS, key management, signing/audit), and what is the target deployment stack (Docker/K8s/on‑prem)? My Suggestions. 1) Add idempotency keys plus the outbox pattern with retry/backoff so payments are safe, de‑duplicated, and recoverable. 2) Define APIs contract‑first with OpenAPI/Swagger and use consumer‑driven contract tests to keep integrations stable over time. My Execution Plan. - Confirm user flows, providers, SLAs, data model, and compliance rules. - Design the architecture (Spring Boot services, API gateway, auth/roles) and Oracle schema. - Set up Liquibase migrations, indexing, and query plans. - Build REST/SOAP APIs with strong validation, clear errors, and idempotency. - Implement provider connectors with circuit breakers, retries, and secure secrets storage. - Write unit/integration tests; run UAT against sandboxes with realistic test cases. - Load test and tune SQL, threads, and JVM; harden security and auditing. - Package with Docker; set up CI/CD and blue‑green deploys to your environment. - Publish OpenAPI docs, runbooks, and diagrams; handover and ongoing support.

@belotefreelancer

10 + years Experience "I have gone through your description. "This is my area of specialization, i can get it done 100 % perfectly well. Please ping me in person. I can help you to complete all tasks. I have hands-on experience in this field. We have already done similar types of projects. Connect with us for more details. Rest assured your satisfaction is guaranteed." Looking forward to your response." Thank you for your time and I am confident that we will be a great fit for this project. Best,

@abhishek060

Hello, This aligns well with a backend-heavy FinTech setup—especially around API integrations, transaction handling, and system reliability. I’ve worked on backend systems involving: • REST API development and third-party integrations (payments, external services) • Transaction-based workflows with strong error handling and logging • Relational database design and performance optimization • Production deployments with staging → UAT → release cycles I’m comfortable working with structured backend systems and handling integrations where stability and data consistency are critical. How I approach this: • Clean, versioned APIs with consistent JSON responses • Service-layer architecture for maintainability • Strong focus on logging, retries, and failure handling (important for payments) • Safe deployments with proper testing and rollback strategy I work well in remote environments and can contribute independently while keeping communication clear and structured. Available for both project-based and long-term collaboration. If useful, I can review your current API/integration flow and suggest improvements before we begin. Regards, Abhishek

@purealmaz

I HAVE A QUESTION: Regarding the third-party integrations, do you already have a prioritized list of partners (e.g., specific mobile operators, e-wallets) and access to their API documentation for the initial phase of the project? I understand your requirements for scalable backend systems and API integrations for a FinTech platform. With extensive experience in building robust backend services, particularly with Java, Spring Boot, and complex API integrations in the FinTech space, I’m confident I can deliver a solution that meets your goals efficiently and reliably. Your request for a developer with strong experience in Java/Spring Boot, Oracle, and FinTech integrations aligns perfectly with my background. One of my recent projects involved architecting the payment gateway for a digital bank. The system supports: - Integration with multiple third-party payment processors via both REST and SOAP APIs, similar to your requirements. - Management of complex database schemas and performance-tuning on a large Oracle database to handle high-volume transactions securely. - The backend was built on a microservices architecture using Java 11+, Spring Boot, Docker, and Kafka. This experience is directly relevant to your project, especially with regard to secure API integrations, database optimization for financial transactions, and building scalable systems with Java and Spring Boot. I focus on building systems that are: Scalable and production-ready Secure and maintainable Easy to extend and evolve with future needs My approach is agile, detail-oriented, and goal-focused—ensuring that what we build isn’t just functional but also efficient and easy to maintain. Let’s connect and discuss how we can bring your idea to life. Looking forward to it! Best regards, Philip Oyedoyin

@mughiraaa

Hello, I will design the backend using java with spring boot to create modular services for payments, wallet operations, and third party integrations, set up clean rest and soap api layers with proper request validation and error handling, and connect oracle database using jpa for structured storage with optimized queries and indexing for performance. i will integrate external providers such as mobile operators, e wallets, and payment gateways through secure api connectors with retry logic and logging, ensure transaction safety with proper rollback handling, and add authentication and authorization for all endpoints. i will also prepare api documentation using openapi standards, support deployment to production environments with clear configuration files, and run testing for integration, uat, and load scenarios to ensure stability and accuracy across all financial flows. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira

@harfarooqi

Hi I have 8+ years of experience in building, scaling and developing enterprise production level application in java spring boot microservices in fintech domain. I have integrated a lot of 3rd party vendors for payment integrations, kyc and security compliances. I have also worked in oracle database with AWS with a couple of certifications. Let's start Best

@chiragpipal

⚠️ If you're not happy, you don’t pay. ⚠️ Hi there, I can build your FinTech backend systems using Java (Spring Boot) with a scalable and secure design. I will deliver: • Java (Spring Boot) backend services • REST & SOAP APIs for seamless integrations • Integration with third-party systems • Oracle database design and optimization • Security, scalability, and performance enhancements • Support for existing FinTech platforms • Deployment, testing, and releases handling • Comprehensive API documentation and technical records You will also receive: • Extensive API documentation • Ongoing support for seamless operations I am confident I can execute your vision professionally and efficiently. Looking forward to discussing further steps. Best regards, Chirag

@rbtech1984

Hi There!!! ★★★★ (Senior backend development for FinTech APIs with secure, scalable Spring Boot architecture) ★★★★ Project understanding: I understand you’re looking for a senior backend developer to build and scale a FinTech system using Java Spring Boot, with strong API integrations (REST/SOAP) and Oracle DB support. The role involves secure payment integrations, performance optimization, and maintaining reliable backend services for mobile money or digital wallet platforms. Services mentioned here based on project details ⚜ Java Spring Boot backend architecture & microservices design ⚜ REST & SOAP API development and third-party integrations ⚜ Oracle DB design, optimization & migration handling ⚜ Secure payment gateway & wallet system integrations ⚜ Performance tuning, scalability & system monitoring ⚜ Deployment support, UAT testing & production release handling ⚜ Clean API documentation and maintainable code structure My approach would be to first review your current system, define API structure and integration flow, then build modular services with proper logging, testing, and deployment pipelines. I’m comfortable working remotely and independently, and can align quickly with your team and timelines. Would be glad to discuss your platform and start contributing soon. Warm Regards, Farhin B.

@hr157

Hi, With 8+ years in backend and API development, I can design secure, scalable systems aligned with FinTech standards. Skills & Deliverables: • Java + Spring Boot backend services • REST & SOAP API development/integration • Third-party integrations (payments, wallets, operators) • Oracle DB design, optimization & migrations • Secure architecture (auth, encryption, rate limiting) • UAT support, deployment & documentation I focus on reliability, performance, and clean architecture for high-volume systems. Let’s connect and discuss your platform requirements.

@nicolegaspi628

Hi, I can help build a secure, scalable backend for your platform As Iam a full-stack developer, I have strong experience with Java, Spring Boot, REST/SOAP APIs, Oracle databases, backend architecture, authentication, API documentation, testing, and deployment support. I can design and maintain services for mobile operators, e-wallets, EMIs, and payment providers. I will focus on clean integration layers, optimized database queries, secure data handling, strong error management, and stable production releases I understand the current platform, define the API contracts, build reliable services, test thoroughly in UAT, document everything, and support release smoothly. I’m comfortable working remotely and independently, with clear communication and long-term collaboration. Thanks, Nico Legaspi