Senior Backend Engineer

Wellfound; Bengaluru; On-site; INR 3,000,000 - 6,000,000; Full time

Job summary

ScopeX is hiring a senior engineer to own the integrity, reliability, and security of ledger, wallet, and back-office platforms. You will write code, tests, and infrastructure definitions to move money securely and reliably across borders from Bengaluru.

Must have 5+ years in core banking or payments, with production depth in Go, Node.js/TypeScript, or Python/Django, plus strong MySQL/RDS expertise and secure design practices. A hands-on role with a focus on testing and runbooks.

Qualifications

• 5+ years building core banking, ledger, or wallet systems.
• Two of Go, Node.js/TypeScript, Python/Django in production.
• Strong MySQL/RDS, transactions, locking, replication, CDC.
• Practical security engineering: least privilege, WebAuthn, audit logs.
• Habit of writing concurrency tests and clear runbooks/design docs.

Responsibilities

• Ledger and transaction integrity design and maintenance for fund-moving flows.
• Integrations with banking, payment, custody, and KYC providers incl. secure callbacks.
• Own authentication, session management, and least-privilege permissions.
• Implement back-office operational controls: step-up authentication, maker-checker, audit trails.
• Improve testing, CI gates, and runtime hygiene.

Skills

Go

Node.js / TypeScript

Python / Django

Security engineering

Concurrency testing

System architecture

Runbooks / design docs

Tools

Go

Node.js

TypeScript

Python

Django

MySQL

RDS

WebAuthn

Job description

ScopeX moves real money across borders. We are hiring a senior engineer with a core banking or payments background to own the integrity, reliability, and security of our ledger, wallet, and back-office platforms. You will set the engineering standard for how money moves through our systems: correct under concurrency, reconcilable to the cent, and safe by design. This is a hands-on role, so you will write the code, the tests, and the infrastructure definitions yourself.

What you will do

• Ledger and transaction integrity: design and maintain fund-moving flows (payments, payouts, refunds, transfers, rewards) that are atomic, idempotent, and fully reconcilable across internal services and external payment partners.
• Partner integrations: build and harden integrations with banking, payment, custody, and KYC providers, including secure callback handling, state-machine-driven transaction lifecycles, and automated reconciliation.
• Authentication and authorization: own customer and staff authentication, session management, and a consistent, least-privilege permission model across services.
• Operational controls: implement banking-grade controls for back-office operations, including strong step-up authentication, maker-checker approval on sensitive actions, and tamper-evident audit trails.
• Engineering assurance: raise the bar on testing and release quality with concurrency and negative-path tests, CI release gates, and dependency and runtime hygiene.

What we need

• Must have at least 5+ years building core banking, ledger, payment, or wallet systems in a bank, fintech, payment processor, or iGaming platform, covering double-entry accounting, idempotent transfers, reconciliation.
• Production depth in at least two of Go, Nodejs/TypeScript, Python/Django.
• Strong MySQL/RDS: transactions, locking, constraints, replication semantics, and CDC.
• Practical security engineering: least privilege, WebAuthn/step-up authentication, audit-log design
• A habit of writing concurrency and failure-path tests, and of writing clear design documents and runbooks.