backend engineer in fintech

Ajaib; United States; Remote; USD 140,000 - 210,000; Full time

Benefits offered by this job

Performance bonus

Comprehensive private health insurance

Paid time off

Company-sponsored training, courses, &

Career growth opportunities

Employee discounts, partnerships, &amp

Job summary

Ajaib Group is a fast-growing Indonesian fintech transforming retail finance and expanding access to financial services. We seek a senior backend engineer to design, build, and operate scalable services used across product teams, owning major components end-to-end with monitoring, on-call support, and clear API contracts.

You will lead authentication/authorization work, improve observability, and scale Kafka-based messaging and API gateways, collaborating with Security, Infra, and Architecture

Qualifications

• Bachelor's degree in CS or equivalent practical experience.
• 5+ years of backend engineering with ownership of production services.
• Strong skills in Java, Go or other modern backend language.
• Knowledge of microservices, REST/gRPC, event-driven design.
• Experience with relational and NoSQL databases, Redis, Kafka.
• Auth tech: OAuth2, OpenID Connect, JWT, secure coding.
• Cloud: GCP or AWS, containers, CI/CD.

Responsibilities

• Design, build, and operate scalable backend services and APIs used by multiple product teams.
• Own large services end to end with monitoring, alerts, and on-call support.
• Design stable APIs with contracts, versioning, and safe deprecation.
• Improve identity and access features including sign-in, sessions, tokens, and permissions.
• Increase resilience with rate limiting, graceful degradation, and safe rollouts.
• Improve observability with metrics, logs, traces, and SLIs with dependent teams.
• Lead design reviews and conduct code reviews.
• Investigate incidents, perform root cause analysis, and deliver fixes.
• Mentor mid-level engineers and share knowledge.
• Work with Security, Infra, Architecture to deliver reliable solutions.
• Scale Kafka and messaging platforms for organization-wide workflows.
• Build high-throughput, low-latency API Gateways and WebSocket infra.
• Develop feature flagging for safe deployments and canary testing.

Skills

Backend engineering

Java

Go

Microservices

REST/gRPC APIs

Observability

Kafka

Authentication/Authorization

OAuth2

OpenID Connect

JWT

GCP/AWS

CI/CD

Databases (SQL/NoSQL)

Redis

Education

Bachelor's degree in Computer Science or equivalent

Tools

Kafka

Redis

Job description

Описание:

Ajaib Group is an Indonesian fintech company focused on transforming retail finance and expanding access to financial services.

Задачи:

• Design, build, and operate scalable, secure shared backend services and APIs used by multiple product teams
• Own larger services end to end, including monitoring, alerting, on-call follow-up, and support for teams using them
• Design stable APIs with clear contracts, versioning, backward compatibility, and safe deprecation
• Build and improve identity and access features, including sign-in, sessions, tokens, permissions, and account security
• Improve service resilience through rate limiting, graceful degradation, consumer isolation, and safe rollouts
• Improve observability with useful metrics, logs, and traces, and set service level objectives with dependent teams
• Lead design reviews and conduct thoughtful code reviews
• Investigate production incidents, perform root cause analysis, and deliver lasting fixes
• Mentor mid-level engineers and share knowledge within the team
• Work with product engineering teams, Security, Infrastructure, and Architecture to turn requirements into reliable solutions
• Design and scale centralized Kafka event streaming and asynchronous messaging platforms for organization-wide notifications and workflows
• Build and manage high-throughput, low-latency API Gateways and WebSocket infrastructure for Ajaib clients
• Develop and maintain feature flagging solutions for safe deployments, canary testing, and dynamic rollbacks

Требования:

• Bachelor's degree in Computer Science or equivalent practical experience
• 5+ Years of professional backend engineering experience, including ownership of production services used by other teams or handling high traffic
• Strong skills in Java, Go, or another modern backend language
• Solid understanding of microservices, REST/gRPC APIs, event-driven design, reliability, and observability practices
• Hands-on experience with relational and NoSQL databases, query tuning, Redis caching, and Kafka messaging
• Strong knowledge of authentication and authorization, including OAuth2, OpenID Connect, and JWT, and secure coding
• Experience running services on GCP or AWS, using containers and CI/CD
• Ownership mindset, clear communication, and a service attitude toward internal users
• Будет плюсом: experience in fintech or another regulated environment, transitioning legacy monolithic authentication to centralized identity providers (IdP), or implementing Zero Trust patterns across microservices

Условия:

• Performance bonus
• Comprehensive private health insurance
• Paid time off
• Company-sponsored training, courses, and professional certifications
• Career growth opportunities, meaningful ownership, and collaboration in cross-functional teams
• Employee discounts, partnerships, and lifestyle perks