The Role
Build and operate scalable backend payment services using Java, Kotlin, and Python. Implement payment flows, APIs, microservices, and event-driven systems; refactor legacy services, migrate deprecated APIs, improve testing, resolve production incidents, and reduce technical debt. Collaborate with product and engineering teams through design, code review, documentation, and Agile sprint delivery. Responsibilities include charges, refunds, disputes, webhooks, internal APIs, CI/CD, and smooth engagement handoff.
Summary Generated by Built In
We are looking for a Senior Backend Engineer to build backend features for payment flows and reduce technical debt across Java services.
The mandatory requirements are 4+ years of backend engineering experience, production backend services at scale, Java with Kotlin and Python, and payments, fintech, or billing domain experience.
RECRUITMENT PROCESS
1. Application — Share a few details about your experience and background.
2. Coding Challenge — If applicable, complete it in the coding language you are most comfortable with.
3. Video Interview — Record a short video introduction in English.
4. Technical Interview or Hiring Manager Interview — Discuss your experience and fit for the role.
5. Offer — If it’s a match, you’ll receive an offer.
WHAT YOU’LL GAIN
• Remote work — Work from where you feel most productive.
• Local presence in India — Work in a structured and compliant environment aligned with Indian regulations.
• Competitive compensation in INR — Receive compensation in INR, plus support for learning, education, and wellness.
• Exciting projects — Work with modern technologies for global clients and fast-growing companies.
MUST HAVES
• 4+ years of backend software engineering experience.
• Experience building and operating production backend services at scale.
• Strong proficiency in Java as the primary programming language, with Kotlin and Python as complementary skills.
• Hands-on experience with RESTful and GraphQL APIs, microservices, and event-driven systems.
• Payments, fintech, or billing domain experience, including gateways, processors, or PSPs.
• Experience writing unit, integration, and contract tests.
• Experience with Agile/Scrum and sprint-based delivery.
• Ability to ramp up quickly on an existing codebase with minimal guidance.
• Experience with Git-based version control and code reviews using GitLab.
• Experience with GitLab CI/CD pipelines.
• Experience with relational databases, particularly MySQL, and SQL.
• Understanding of distributed systems, including message queues, asynchronous processing, and eventual consistency.
• Experience using Jira for task and sprint tracking.
• Production experience building end-to-end backend payment flows, including charges, refunds, disputes, and webhooks.
• Experience refactoring or migrating legacy services with regression testing.
• Experience resolving production incidents in payment or billing systems.
• Experience designing internal APIs consumed by multiple downstream services.
• Upper-intermediate English level.
NICE TO HAVES
• Experience in a large enterprise engineering organization.
• Experience with Spring Boot, Gradle, or service mesh.
• Knowledge of PCI-DSS compliance, payment security, or financial data handling.
• Experience with observability tooling such as Datadog.
• Open-source contributions or a portfolio of shipped payment features.
WHAT YOU WILL DO
• Implement new backend features for payment flows.
• Reduce technical debt by refactoring legacy services, improving test coverage, and modernizing APIs, including deprecated API migrations.
• Write clean, well-tested, production-ready code that meets engineering standards and passes CI/CD checks and peer review before merging to main.
• Deliver multiple initiatives within agreed sprint cycles and participate in code reviews, design discussions, and sprint ceremonies with the Payments engineering team.
• Collaborate with product managers, partner teams, and engineers to clarify requirements and deliver end-to-end solutions.
• Document owned workstreams, including designs, API specifications, knowledge-transfer documents, and runbooks, to support long-term maintainability.
• Ensure a smooth hand-off to the full-time engineering team at the end of the engagement.
Skills Required
- 4+ years of backend software engineering experience
- Experience building and operating production backend services at scale
- Strong proficiency in Java, with Kotlin and Python as complementary skills
- Experience with RESTful and GraphQL APIs, microservices, and event-driven systems
- Payments, fintech, or billing domain experience, including gateways, processors, or PSPs
- Experience writing unit, integration, and contract tests
- Experience with Agile/Scrum and sprint-based delivery
- Ability to ramp up quickly on an existing codebase with minimal guidance
- Experience with Git-based version control and GitLab code reviews
- Experience with GitLab CI/CD pipelines
- Experience with relational databases, particularly MySQL, and SQL
- Understanding of distributed systems, message queues, asynchronous processing, and eventual consistency
- Experience using Jira for task and sprint tracking
- Production experience building end-to-end backend payment flows, including charges, refunds, disputes, and webhooks
- Experience refactoring or migrating legacy services with regression testing
- Experience resolving production incidents in payment or billing systems
- Experience designing internal APIs consumed by multiple downstream services
- Upper-intermediate English proficiency
- Experience in a large enterprise engineering organization
- Experience with Spring Boot, Gradle, or service mesh
- Knowledge of PCI-DSS compliance, payment security, or financial data handling
- Experience with observability tooling such as Datadog
- Open-source contributions or a portfolio of shipped payment features
Am I A Good Fit?
Get Personalized Job Insights.
Our AI-powered fit analysis compares your resume with a job listing so you know if your skills & experience align.
Success! Refresh the page to see how your skills align with this role.
The Company
What We Do
AgileEngine is a privately held company established in 2010 that builds dedicated teams of designers and developers. We turn good ideas into awesome software that people actually want to use. Some of the biggest names and the hottest startups around the world chose us to build their tech.
