LEAD SOFTWARE DEVELOPER - FinTech

@sptechnocrats

Hi, Your project stood out to me because it’s not just another fintech build — it’s real infrastructure with a live telecom partner and a clear delivery deadline. I enjoy working on systems where reliability and clean architecture matter from day one. I’ve been building backend platforms with **Python (FastAPI), PostgreSQL, and Redis** for several years, usually for API-driven products that require secure transactions and strong data integrity. I’m comfortable designing modular services, implementing audit logging, reconciliation logic, and handling authentication with JWT/OAuth. For this project, I’d focus on building a stable and maintainable foundation: a FastAPI backend running on Docker/Linux with PostgreSQL and Redis, a clear transaction state machine to handle contributions and payouts, and proper error handling for intermittent connectivity. I’d also handle the integration with the Ericsson digital currency API, including payment initiation, callbacks, and idempotency to prevent duplicate transactions. On the mobile side, I’ve worked with **cross-platform frameworks like Flutter and React Native**, connecting apps to backend APIs and preparing them for production releases. I’m also comfortable working in environments where AI tools are used to speed up development, while carefully reviewing and refining the output. I’m available for a **full-time, long-term role** and comfortable working remotely with a small team. Happy to share GitHub work, project examples

@jastp

Greetings from Logictrix! My name is Jas, and I am looking forward to discuss about your app in details over the Chat or Call. We have enough app developers available in team so I can assure you to deliver this project at a fairly low cost with great quality and with a commitment for long term support. *** We have now earned 'Expertise' level in AI, ChatGpt and a couple of other AI platforms for App development and other Chatbot work! *** We have developed around 400+ Android and iOS apps using Native and Flutter SDK in the past 15 years, Many apps are Live in Google play and App store. We will share our detailed portfolio over the Chat once we connect. Looking forward to your reply... Thanks and Regards Jas

@neerajdhameliya

Hello ◆◆◆◆◆ Portfolio◆◆◆◆◆ https://www.freelancer.com/u/neerajdhameliya I have experience in building Python systems for the backend and mobile apps. I can help you create a fintech platform with a strong backend. This platform will have transaction handling and mobile apps that work well even when the internet connection is slow. ◆ Backend Development: I create Python APIs using FastAPI or Django. I use PostgreSQL and Redis to make sure the systems are scalable and reliable. ◆ API Integration: I connect payment and external APIs. I make sure to track the status handle callbacks and fix errors. ◆ Mobile Applications: I build Android and iOS apps using Flutter. These apps connect to secure backend services. ◆ Transaction Systems: I set up transaction flows. I also handle logging and reconciliation for applications. ◆ Infrastructure: I deploy applications using Docker and Linux servers. I use cloud platforms. Set up CI/CD workflows. ◆ Security: I implement authentication. I use encrypted storage. Follow best practices for financial systems. ◆ AI-Assisted Development: I use AI tools like GPT and Claude. These tools help me develop faster and keep the code clean and valid. I am okay with working time remotely. I can work directly with the leadership team. Deliver stable systems on time. I look forward, to hearing from you. Niral D

@Julian29

Hello, {{{ I HAVE CREATED SIMILAR APPS BEFORE AND I CAN SHOW YOU }}}} I have carefully reviewed your requirement for a Lead Software Developer for your FinTech platform. The concept of building a mobile money infrastructure with a Python/FastAPI backend, payment API integrations, and cross-platform mobile applications aligns strongly with my experience. I bring 10+ years of experience working with Python, FastAPI/Django, PostgreSQL, Redis, API integrations, and secure financial systems. I also have solid experience developing Android, iOS, and cross-platform mobile applications (React Native/Flutter) along with cloud deployment using Docker and modern CI/CD workflows. I am comfortable working with AI-assisted development tools and validating generated code to ensure production-grade quality. I can take ownership of the backend architecture, payment integration, transaction lifecycle logic, and mobile apps, ensuring clean code, scalable design, and reliable deployment to meet your Phase 1 milestone. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. I am available to start immediately and work full-time on this long-term engagement. I eagerly await your positive response. Thanks

@dreamci

As a veteran software developer with over 20 years of experience, I've honed my skills across various sectors—your Fintech project happens to dance to the tunes of my strengths. My vast knowledge of Python and mobile development (Kotlin/Java + Swift) as well as React Native and Flutter puts me in good stead to handle the core task of building companion apps for your project. Making use of the reactive and versatile functionalities of these frameworks, I can ensure seamless synchronization with backends. Utilizing FastAPI or Django REST, PostgreSQL, Redis, async programming, JWT/OAuth2, I am well equipped to build a robust infrastructure for your project; ensuring secure financial application storage and API integration is a given. Added to this, my proficiency in AWS/GCP or DigitalOcean infrastructure makes Docker and CI-CD second nature to me. My exposure to areas like Ericsson digital currency API integration and USSD menu engine also aadds value to your specific requirements.

@ASirbescu

As a Full-Stack Developer with 3–4 years of experience, I am proficient in Python and have extensive experience building backend systems using FastAPI and Django REST, along with PostgreSQL, Redis, async programming, and JWT/OAuth2 authentication. I regularly work with AI-assisted development tools such as Claude Code, which helps me deliver efficient and high-quality solutions. I also have mobile development experience with Swift for iOS and Kotlin/Java for Android. My familiarity with cloud infrastructure—including DigitalOcean, AWS, and GCP—enables me to design and deploy scalable systems. For security-sensitive applications such as financial platforms, I have solid knowledge of encrypted storage and secrets management. Having delivered time-sensitive projects before, I am confident in meeting the May 2026 milestone. I can deliver a fully functional backend system, synchronized mobile app core features, USSD menu flows, and clear architecture documentation with deployment runbooks within the 12-week timeframe. Overall, my experience across backend systems, mobile development, and scalable infrastructure ensures that I can deliver a clean, maintainable codebase aligned with both the phase-one deliverables and the project’s long-term goals.

@rbtech1984

Hello There!!! ★★★★ ( FinTech Mobile Money Infrastructure Development ) ★★★★ I read your requirement carefully. You are building a production fintech platform with Python/FastAPI backend, mobile apps and USSD flows integrated with a telecom digital currency API. The goal is delivering a stable system with transaction logic, audit logging and reliable payments before the May milestone. ⚜ Python FastAPI backend with PostgreSQL and Redis ⚜ Digital currency / payment API integration ⚜ Transaction lifecycle and state machine logic ⚜ Android & iOS apps using React Native or Flutter ⚜ USSD flow engine for low bandwidth devices ⚜ Secure financial data handling and audit logs ⚜ CI/CD, Docker deployment on DigitalOcean I have 9+ years experience building backend systems, fintech style APIs and mobile apps. I regularly work with AI assisted development tools and focus on validating outputs to keep code clean and production ready. My approach would start with designing a modular backend using FastAPI, Redis queues and PostgreSQL ledger tables, then building mobile apps synced via secure APIs. Payment flows, idempotency and logging will be carefully handled for financial reliability. Happy to share portfolio and discuss the roadmap if the role seems a good fit. Warm Regards, Farhin B.

@Engumer480

With your Boston-based fintech company building mobile money infrastructure for underserved markets, my skills and experience make me uniquely qualified. As a seasoned freelancer, I have been at the forefront of cutting-edge technologies that align significantly with your project. These include a strong focus on Python and Django for FastAPI backend development - just one of the many impressive languages in my repertoire.

@vasudharao9

Hi, I’m a Computer Science graduate from UC Berkeley with a specialization in Artificial Intelligence. I have more than 10 years of experience working in the AI/ML space. I can help you with this project. Message me to discuss this further.

@itswahabahmad

As an experienced Unity Game Developer with knowledge in AWS DevOps, I may not check all the boxes for a Lead Software Developer role in FinTech, but what I can undoubtedly offer is an unflinching commitment to pushing boundaries and delivering high-quality projects within stringent timelines. My proficiency in Python and mobile app development (Flutter in particular) will ensure a smooth transition into the digital currency sector. Although I might lack experience with specialized tools like Claude Code and specific payment API's, my strength lies in my ability to adapt and learn new technologies swiftly. The seamless integration between erudition, application, and delivery of your USSD infrastructures would be aided by my experience in optimizing connectivity for low-bandwidth applications. Combining my proficiency in backend development (Python/FastAPI), experience with Android and iOS applications for both Kotlin/Java + Swift languages, robust infrastructure management capabilities using Docker and AWS/DigitalOcean, I am confident we will successfully hit and transcend your May 2026 milestone together. Looking forward to discussing how we can leverage the skills I can bring to your project!

@FaizalShaik80

Hello, hope you are well. I’ve carefully reviewed your requirements, and this is essentially the same type of project I completed two months ago. I am an experienced and specialized freelancer with 6+ years of practical experience in Python, FastAPI, PostgreSQL, React Native and I’m able to complete and deliver this project promptly. Please visit my profile to check the latest work and honest client reviews. Looking forward to working with you, connect in chat. Regards.

@Rekhathakur

Hello, With over a decade of experience in custom software development, my team and I at WellSpring Infotech have cultivated a profound understanding of the fintech landscape. Combined with our expertise in Python (including FastAPI) and mobile development (including Flutter), we have the essential proficiencies you outlined for this project. And yes, we work proficiently with AI-driven tools like Claude Code - it's a central part of our development process. Moreover, when it comes to infrastructure, we are well accustomed to leveraging platforms like DigitalOcean, AWS/GCP for secure and scalable solutions. Our broad understanding of security practices and financial application requirements further assures your digital currency application will be in safe hands. Lastly, though not mandatory, our prior experience working with digital payments within emerging markets (like Nigeria and Ghana) has primed us to handle the unique challenges that such contexts can pose. My team's proactive approach means we gather information, prepare for potential complications (like low bandwidths), and tackle them head-on before they become bottlenecks. Choosing us for this critical build means selecting an experienced partner who is dedicated to delivering high-quality products even on tight schedules. With Regards! Rekha

@maxscender

I can help you. I use Claude Code to handle the heavy lifting of boilerplate and USSD menu routing, allowing me to focus my manual review on the core financial state machine and ledger integrity. A hidden challenge in this architecture is the state synchronization between the USSD engine and the React Native app. In 2G environments, users often drop mid-session; the backend must maintain a Redis-backed session state that prevents race conditions if a user switches interfaces during a pending contribution. I will prioritize a strict idempotency layer for the Ericsson API integration. In high-latency markets, a request timeout is a "maybe," not a "no." I'll implement unique transaction UUIDs at the initiation phase to ensure that intermittent connectivity never results in duplicate payouts or double-counting in the ROSCA cycle. I’ll also implement an automated background reconciliation worker from day one. Relying solely on carrier webhooks is a risk in emerging markets; the system needs to actively poll and verify the shadow ledger against the partner's API to handle missing callbacks.

@ank26oct

With over 12 years of experience as a software developer, I offer deep proficiency in many languages and platforms, including AI, React Native, and Flutter. These skills make me an ideal candidate for your project as they reflect significant exposure to cutting-edge technologies that align with your requirements. Moreover, my experience with Django REST and FastAPI with PostgreSQL and Redis, Digital Ocean Infrastructure, and financial-grade application security perfectly match the technical aspects of this undertaking. Lastly, my experience is not confined to the technical aspects; I've also worked in emerging markets similar to yours such as Ghana and Kenya. Along with hands-on familiarity of financial-grade systems with reconciliation requirements, this adds yet another layer of value to my candidacy. Demonstrating my capabilities over the past 12 week s through weekly demonstrations as you require would be my pleasure. Partnering with a prestigious fintech company like yours with whom I share strong values would be an honor - leading us to deliver a transformative product digitizing such a traditional practice for billions where aged mediums fail to reach.

@Shaiwan

❗❕‼️⁉️ Hello ⁉️‼️❕❗ ❗❕❗❕❗❕ I understand you need a Lead Software Developer to build a full production fintech system with Python/FastAPI backend, mobile apps, USSD flows, and digital currency integration. I HAVE SOME QUESTIONS REGARDING THE PROJECT SEND ME A MESSAGE FOR MORE DISCUSSION ❗❕❗❕❗❕ ⇆ ⇆ ⇆ I will design and implement the backend including modular monolith, PostgreSQL, Redis, contribution engine, transaction state machine, and audit logging; develop Android/iOS companion apps with React Native or Flutter; integrate Ericsson digital currency API with idempotency and callbacks; build USSD menu flows for onboarding, contribution, payout, and account management; ensure security, CI/CD, and scalable deployment on DigitalOcean ⇆ ⇆ ⇆ With 7+ years of experience in Python, mobile apps, and fintech systems, I deliver clean, secure, and scalable solutions with AI-assisted development. My approach: architect robust backend modules, implement mobile and USSD interfaces in parallel, integrate APIs, test thoroughly under 2G constraints, and provide documentation for handoff. Let’s chat to discuss milestones and timeline. Best Regards, Shaiwan Sheikh

@engmalaa

As a seasoned professional with over 10 years of technical and sales experience, I am confident that my skills and knowledge make me the perfect candidate for the Lead Software Developer role in your groundbreaking Fintech project. Aside from my expertise in advanced aspects of AI, software development, and cloud deployment using Docker and AWS (which are all pivotal to this project), what sets me apart is my ability to produce clean, robust code that optimizes workflow efficiency. Having seen through major projects such as CRM/ERP integrations for reputable companies including Salesforce and Zoho, I have developed a proficiency in building scalable solutions in fintech contexts. Additionally, I have published mobile apps on Android/iOS platforms, priming me with the expertise needed for this multifaceted task. My decision-making capabilities on handling AI output aligns perfectly with your operation style since you rely heavily on AI-assisted development tools like Claude Code. Lastly, I am no stranger to remote work as it has been an essential part of my career; rest assured that communication will be seamless during the entire project duration. If you seek someone who brings both technical knowledge and strategic thinking to spearhead your Phase 1 build towards milestone delivery in May 2026, look no further; let's partner together to ensure your fintech product makes a positive impact on the underserved markets!

@jeanpatrickr8

Hello, I appreciate the opportunity to apply for the Lead Software Developer position at your innovative fintech company. I understand the critical nature of your project, particularly the need to build a robust mobile money infrastructure that serves underserved markets, with a focus on delivering a live production build by May 2026. With over four years of experience in software development, I specialize in Python and FastAPI, and I am proficient in integrating APIs, including payment systems. My daily work with AI-assisted tools like Claude Code allows me to write clean, efficient code while validating and correcting AI outputs, which aligns perfectly with your requirements. To ensure a successful Phase 1 build, I propose the following approach: - Develop a modular backend using Python/FastAPI and PostgreSQL, implementing robust error handling for 2G connectivity. - Integrate the Ericsson digital currency API for a seamless payment process while ensuring security and compliance. - Create responsive mobile apps for both Android and iOS using React Native, ensuring synchronization with backend functionalities. - Conduct weekly demonstrations to track progress and make adjustments as needed. I am eager to contribute to your project and confident in delivering quality results on time. I look forward to discussing this exciting opportunity further. Thank you for considering my application.

@Azursol

Dear , I am a seasoned Lead Software Developer with a strong background in Python, FastAPI, mobile app development, and infrastructure management. I am excited about the opportunity to spearhead the Phase 1 build for your innovative FinTech project. My experience aligns closely with your requirements, particularly in working with AI-assisted development tools and delivering clean, efficient code. My approach involves leveraging Python/FastAPI for the backend, integrating Ericsson's digital currency API, and developing robust transaction and audit systems. I am well-versed in mobile development and have a proven track record of successful project deliveries. I prioritize effective communication and timely results, ensuring a seamless collaboration with your team. I would welcome the chance to discuss how I can contribute to your project further. Looking forward to connecting soon. Warm regards,

@Cmonosoft

Hi there, I am applying for the Lead Software Developer role. I am a full-time software engineer with strong experience in Python backend systems and cross-platform mobile applications, and I am comfortable working in high-accountability environments with hard delivery milestones. I have built production systems using Python with FastAPI and Django REST, PostgreSQL, Redis, and async workflows. I have implemented payment flows, webhook handling, status polling, and reconciliation logic in financial applications. Portfolio and GitHub: Available upon request Backend and mobile projects: Financial transaction platform with reconciliation engine; cross-platform mobile app with real-time API sync and secure payments CV and LinkedIn: Available upon request Interview availability: Immediate Monthly rate expectation: Open to discussion based on scope and commitment I am ready to start immediately and commit full-time through the May 2026 milestone. Thanks Saurabh