Senior Backend Software Engineer APEXX

Earnmodes; Bengaluru; Hybrid; INR 3,500,000 - 6,000,000; Full time

Benefits offered by this job

Health insurance

Remote-friendly

Generous leave

Work From Anywhere

Job summary

APEXX in Bengaluru, India, seeks a Senior Software Engineer (Backend) to own core payment orchestration and platform components. You will design scalable backend services, ensure reliability during failures, and contribute to routing, tokenisation, and reconciliation.

The role involves on-call duties, CI/CD improvements, and collaboration with global teams. You should bring strong Java/Spring Boot experience, PostgreSQL expertise, and hands-on AWS, containers, and infrastructure-as-code skills,

Qualifications

• Extensive experience building and running production backend services in Java/Spring Boot or similar JVM stack.
• Strong knowledge of distributed systems, retries, idempotency, timeouts, and failure handling.
• Proficient PostgreSQL with transactions, isolation and query tuning; Redis or equivalent cache.
• Hands-on AWS, CI/CD, containers and infrastructure-as-code experience.
• Proven track record of on-call ownership, debugging with logs and incident RCAs.

Responsibilities

• Own core payment flows end-to-end: authorization, capture, refunds, and MT/recurring scenarios.
• Evolve routing, failure handling, and outage recovery with data-driven rules and Smart Split.
• Build and maintain connectors to acquirers, APMs and BNPL providers; handle API drift.
• Design for correctness under failure: idempotency, timeouts, webhooks, and reconciliation.
• Run the platform: on-call participation, SLOs, runbooks, and CI/CD improvements.
• Mentor engineers, review code, and help modernise the stack (Java 17, Spring Boot).

Skills

Backend development

Java / Spring Boot

Distributed systems

PostgreSQL

Redis

AWS

CI/CD

Containers

IaC

On-call / incidents

Tools

PostgreSQL

Redis

AWS

Docker

Kubernetes

CI/CD tools

Job description

Senior Software Engineer (Backend) — Payment Orchestration & Platform
Location: Bengaluru, India (hybrid) | Team: Platform Engineering | Level: Senior, Backend Track

OVERVIEW
APEXX is an independent, enterprise payment orchestration platform. Merchants connect to APEXX once and reach the world’s payment ecosystem: acquirers, alternative payment methods (APMs), Buy Now, Pay Later (BNPL) providers and network tokenisation. Our routing engine (AIRE), cascading, Smart Split and Revenue Protect decide in milliseconds where each transaction should go to maximise acceptance and minimise cost. We don’t own an acquirer, so our only incentive is the merchant’s outcome.

We’re backed by MMC, Forward Partners, Alliance VC & Finch Capital and growing with enterprise travel and eCommerce merchants including Jet2, TUI, Ryanair, CarTrawler and Hotelbeds.

We’re looking for a Senior Software Engineer in Bengluru to help build and run the core of that platform.

This role covers everything in orchestration – payment flows, routing, connectors, tokenisation, webhooks and reconciliation – and how we run the platform: reliability, on-call, CI/CD and shared engineering practices. We build it, we run it, and done means released, not dev-complete.

WHAT YOU’LL BE DOING

• Own core payment flows end to end: authorisation, capture, refund, void and MIT/recurring across card and APM rails, from design doc to production and beyond.
• Evolve our routing and recovery logic: rules-based and data-driven routing, decline cascading, Smart Split and outage failover — making sure a retry never becomes a double charge.
• Build and maintain connectors to acquirers, APMs and BNPL providers: normalise responses, handle API version drift and design for partner outages.
• Design for correctness under failure: idempotency, timeouts, ambiguous payment states, asynchronous notifications and webhooks, and reconciliation against settlement files.
• Protect cardholder data: work within our tokenisation and vault services, HSM-backed cryptography and PCI DSS, SOC 2 and ISO 27001 controls, keeping PCI scope as small as possible.
• Run the platform: join the on-call rotation, define and track SLOs and service dashboards, write runbooks, lead incidents and blameless RCAs, and improve our Gitlab CI/CD and AWS estate (ECS, Lambda, API Gateway, S3).
• Raise the bar with the team: write technical design docs, give high-quality code reviews, mentor engineers and help us modernise our stack, including our move to Java 17 and newer Spring Boot.
• Work across the business with Product, Solutions, Support and our UK colleagues, turning merchant and partner needs into reliable systems.

ABOUT YOU

• Significant experience building and running production backend services in Java and Spring Boot, or a comparable JVM or backend stack and a willingness to move to ours.
• A strong grasp of distributed-systems failure modes: retries, idempotency, timeouts, concurrency, eventual consistency, and how to reason about “we don’t know if it happened”.
• Solid PostgreSQL skills (schema design, transactions and isolation, query tuning) and practical use of Redis or similar caches.
• Hands-on AWS experience and comfort with CI/CD, containers and infrastructure-as-code.
• You’ve owned services in production: on-call, debugging with logs, metrics and traces, leading incidents and writing up what the team learned.
• Clear written communication: design docs, runbooks, RCAs and merge request descriptions that others can act on.
• You use AI coding tools productively and critically: you know when to trust the output, and you verify it with tests and review before it ships.
• You help the people around you get better through review, pairing and mentoring.

NICE TO HAVE

• Payments experience: card acquiring, 3DS2/SCA, network tokens, APMs/BNPL, settlement and reconciliation, or payment orchestration.
• Working knowledge of PCI DSS, HSMs and key management, or OAuth2/mTLS for partner integrations.
• Observability tooling, SLO-based alerting, or analytics stacks such as Snowflake or QuickSight.
• Experience in a Scale-up or Fintech working with UK or global teams.

HOW WE HIRE

• a talent screen,
• a conversation with the hiring manager,
• a hands-on technical session and
• a system design session.

Before your first interview, we’ll send you a short guide on how to prepare for each round. You’re welcome to use your own AI tools in both technical rounds — we’re interested in how you think, verify and decide. Once a decision is made, every candidate receives a written feed-forward from the panel. Tell us about any adjustments you need and we’ll make them.

COMPENSATION & BENEFITS

• Competitive compensation that recognises your skills, experience and impact.
• Generous time off: annual leave, public holidays and wellbeing-focused time away from work.
• Work From Anywhere: up to 90 days a year from eligible locations, subject to our policy.
• Comprehensive health insurance for you and your loved ones.
• Personal accident insurance for when it’s needed most.
• Enhanced family leave: enhanced parental and family-friendly leave policies.
• Learning & growth: opportunities to learn, grow and build a meaningful career at APEXX.

WHO WE ARE & WHERE WE ARE

APEXX is a global payment orchestration platform with teams in the UK and India. For more than a decade we’ve helped enterprise businesses simplify payments through a single, scalable integration, with access to 200+ acquirers,150+ alternative payment methods and 10+ BNPL providers. We’re trusted by leading global brands including Ryanair, TUI, Hotelbeds, CarTrawler, Avon and Jet2.

APEXX is an equal opportunities employer committed to equality, diversity and inclusion.

We do not accept speculative CVs or candidate profiles from recruitment agencies.