Blockchain Wallet Backend & API
Budget: $250 – $750 USD
I already have fully designed mobile and web front-ends; what I’m missing is the engine behind them. Your task is to build a production-ready backend that powers a multi-currency wallet, exposes a clean API, and gives me an administrator console I can actually run the business from.
Wallet core
The service must let every user check their balance, browse an accurate transaction history, and send or receive cryptocurrency with on-chain confirmation. Speed and reliability are paramount, so efficient queueing and retry logic will be essential.
Public API
I need a REST/JSON (GraphQL is fine if you can prove the advantage) layer that provides secure user authentication, up-to-the-minute cryptocurrency exchange rates, and full transaction processing. Token-based auth, rate-limiting, and thorough input validation are non-negotiable. Please document the endpoints in Swagger or an equivalent tool so my front-end team can plug straight in.
Administrator control panel
Inside the control panel I want granular user management, searchable audit logs, and live system monitoring so I can see node health, memory usage, and pending jobs at a glance. A simple Help / FAQ editor will round out the console so I can update guidance without touching code. Data should flow in real time where possible, and every admin action must be captured for compliance.
Security & deployment
Harden everything with 2FA, role-based permissions, cold-wallet protocols, and automated backups. Containerised deployment scripts (Docker or Kubernetes) will make it effortless for me to spin up staging and production environments.
Deliverables
• Complete backend source code with unit tests
• Database schema and migration files
• Swagger/Postman collection for every endpoint
• Admin panel modules: wallet, users, audit, monitoring, help
• Docker/K8s configs plus setup instructions
• Final walkthrough and 30-day bug-fix grace period
Acceptance criteria: wallet actions return in under two seconds on testnet, 100 % of endpoints are documented, and every admin click lands in the audit log.
If this sounds like your kind of build, let’s talk timelines and milestones.
Wallet core
The service must let every user check their balance, browse an accurate transaction history, and send or receive cryptocurrency with on-chain confirmation. Speed and reliability are paramount, so efficient queueing and retry logic will be essential.
Public API
I need a REST/JSON (GraphQL is fine if you can prove the advantage) layer that provides secure user authentication, up-to-the-minute cryptocurrency exchange rates, and full transaction processing. Token-based auth, rate-limiting, and thorough input validation are non-negotiable. Please document the endpoints in Swagger or an equivalent tool so my front-end team can plug straight in.
Administrator control panel
Inside the control panel I want granular user management, searchable audit logs, and live system monitoring so I can see node health, memory usage, and pending jobs at a glance. A simple Help / FAQ editor will round out the console so I can update guidance without touching code. Data should flow in real time where possible, and every admin action must be captured for compliance.
Security & deployment
Harden everything with 2FA, role-based permissions, cold-wallet protocols, and automated backups. Containerised deployment scripts (Docker or Kubernetes) will make it effortless for me to spin up staging and production environments.
Deliverables
• Complete backend source code with unit tests
• Database schema and migration files
• Swagger/Postman collection for every endpoint
• Admin panel modules: wallet, users, audit, monitoring, help
• Docker/K8s configs plus setup instructions
• Final walkthrough and 30-day bug-fix grace period
Acceptance criteria: wallet actions return in under two seconds on testnet, 100 % of endpoints are documented, and every admin click lands in the audit log.
If this sounds like your kind of build, let’s talk timelines and milestones.
Related categories:
PHP
JavaScript
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Software Architecture
Blockchain
Docker
Kubernetes
API Development