Junior Payment Dev/Test EngineerFull Stack Engineer

Junior Payment Dev/Test Engineer
IntelloCore | Engineering – Payment Assurance
preferred Location: Noida/Chennai (Hybrid)
Experience: 1–3 years
Employment type: Full-time
About the role
Payments fail in ways ordinary software doesn't. A single mis-set bit in an ISO 8583 bitmap, a response code that maps to the wrong outcome, a settlement file that doesn't reconcile — and real money is stuck.
We're hiring a Junior Payment Dev/Test Engineer to help build the validation that catches those failures before they reach production. You'll work alongside Payments SMEs, developers and product teams on payment flows, payment switches, and the automation frameworks that validate them.
This is not a traditional QA execution role. You'll build across payment domain + development + automation + validation + integration + performance — and grow into genuine payments engineering expertise.
What you'll do
Learn the payments domain properly
End-to-end card transaction processing: authorisation, clearing and settlement
Issuing and acquiring flows
POS, ATM, EFTPOS, payment gateway and payment switch architecture
Work directly with senior Payments SMEs on complex real-world scenarios
Work with payment messages
Build working knowledge of ISO 8583 — MTI, bitmaps and data elements
Create, modify and validate request/response messages
Perform field-level validation, message comparison, and mapping/transformation checks
Validate response codes and transaction outcomes
Develop a foundation in ISO 20022 message families and flows
Build and validate APIs
Design and execute REST API validation scenarios
Validate JSON and XML payloads, HTTP status codes and business responses
Positive and negative path coverage
Postman collections, automated with Newman or equivalent
Build reusable API validation utilities
Automate
Develop and maintain Playwright automation
Execute automated regression suites
Contribute to CI/CD-based automated validation
Investigate failures
Analyse failed transactions and pinpoint the exact point of failure
Work through application logs and transaction traces
Reproduce, document and retest defects with clear evidence
Partner with developers through to resolution
Document what you learn
Validation scenarios, conditions and expected results
Execution reports and investigation findings
Transaction flow diagrams and reusable payment knowledge assets
What we're looking for
Must have
1–3 years in software development, QA automation or payment technology
Hands-on dev/test exposure to payments — ISO 8583, ISO 20022, payment switches
Playwright
Working knowledge of Python
Basic SQL and Git
Solid grounding in the SDLC and software testing principles
Strong debugging and analytical instincts
Nice to have
Card issuing, merchant acquiring, EMV, payment gateways
JMeter, Newman
Jenkins, GitHub Actions or GitLab CI
Maven, Docker
Rest API validations
You'll do well here if you
Investigate problems logically rather than guessing
Have real attention to detail — in payments, the detail is the job
Can read a technical specification and work from it
Take ownership of what you build
Genuinely want to learn how money moves
Education: Bachelor’s degree in computer science, IT, Engineering or a related discipline. Candidates with relevant development, automation or payments experience preferred.
What the first two months look like
By the end of your first 1–2 months, you should be able to:
Walk through an end-to-end card payment transaction
Read and interpret ISO 8583 messages
Create and execute payment validation scenarios
Write Playwright automation scripts and run automated regression suites
Analyse a failed transaction from logs and traces to root cause
Write defect reports someone else can act on
Run basic performance tests
Independently own a small payment validation module

Work arrangement
Hybrid