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Fiverr Pro
English
$
USD
I will build a secure fintech backend for loans, cards, payments or wallets
Chris A.
About this gig
Fintech backends fail in ways normal apps do not. A rounding error or a race condition on a balance becomes a compliance problem. I build backends that handle money correctly from day one.
As Development Manager at a global payments processor I architected and built credit products including loans, cards and loyalty programs on AWS Lambda, DynamoDB, SQS and SNS. Before that I created kinti.bg, a consumer fintech platform, as CTO.
What I build:
- Loan origination, repayment schedules and interest calculation
- Card issuing and transaction processing flows
- Wallets, ledgers and double entry accounting
- Payment gateway and open banking integrations
- KYC, AML and GDPR compliant data handling with audit trails
- REST APIs with documentation for your frontend or partners
Stack: Python or PHP with Laravel, Node.js, PostgreSQL, MySQL or DynamoDB, event driven services on AWS, Terraform, CI pipelines and automated tests.
You receive tested code in your repository, deployment configuration and documentation. I can also review or extend an existing fintech codebase.
Message me before ordering with what you are building, your target market and any regulatory requirements.
Get to know Chris A.
Chris A.
Fractional CTO, Software architect, Fintech, AWS, AI integration
- FromBulgaria
- Member sinceOct 2026
Languages
German, English
Former CTO offering senior backend and architecture work. For 15 years I have built fintech platforms for loans, cards and payments, multi tenant SaaS and ERP systems, and event driven microservices on AWS with Python, PHP and Node.js. I handle system design, production code, Terraform, Docker and CI pipelines, and I integrate Claude and OpenAI into existing products. Clients get a clear plan, realistic estimates and documentation they can hand to their own team. Fluent in English, German and Bulgarian.
FAQ
Which package do I need?
Basic is one bounded piece of work, such as a payment gateway integration or a repayment schedule engine. Standard is a complete feature set with its API, such as a loan or wallet module. Premium is a full backend from zero with infrastructure and CI. If you are not sure, message me with what you ar
Can you work in my existing codebase?
Yes, in Python, PHP with Laravel or Node.js. Standard and Premium include a review of the existing code before I start. I follow your conventions and deliver through pull requests to your repository so your team can review every change.
Do you handle compliance and regulation?
I build the technical side: KYC and AML data flows, GDPR compliant data handling, audit trails, and keeping card data out of your systems through tokenisation. Legal interpretation of regulations in your market stays with your compliance advisor, and I work from their requirements.
What do I receive at the end?
Tested code in your repository, automated tests, API documentation, deployment configuration and a written handover document. For Premium, also the Terraform code for the infrastructure and a recorded walkthrough session for your team.
