Backend Engineer (Service Platform)

Job Summary

A backend engineer who builds the foundation every other team depends on.

Next Securities builds stable trading infrastructure and scalable services with a technology-centric mindset.

We are in the early stages of designing and implementing new platform systems, and we are at a point where we can define superior technical standards without the constraints of the existing structure. We are a team where engineers proactively design and complete the direction of the platform in an environment requiring high throughput, real-time data, multi-tenant reliability, and high availability. Service Platform Team's services sit on the critical path of every product team, therefore the quality of our design directly shapes the velocity and stability of the entire engineering organization

[Key Responsibilities]

• Design, development, and operation of platform services, such as notifications, market data, experimentation, the API gateway, and AI agents.
• Design and enhancement of architecture for large-scale event processing, real-time data streams and high-fan-out workloads
• Domain model and data design that ensure correctness, consistency, and reliable delivery across shared services
• Non-disruptive deployment, real-time monitoring, and continuous improvement of the failure response system
• Standardization of service structure through event-driven architecture and reusable common modules
• Participation in establishing a long-term technology roadmap and structural design for next-generation trading infrastructure

In the process of building a new system together, engineers stand at the center of technical decision-making and directly participate in structural design from a long-term perspective.

[Technology Stack]

• Language / Framework: Kotlin/Java, Spring Boot
• Infra / Tools: Kafka, Redis, Kubernetes, Docker, AirFlow, ELK, Grafana
• Database: PostgreSQL, Oracle
• Ops: Establishing automated deployment, service monitoring, and log analysis environments

[Essential Qualifications]

• Over 5 years of backend development experience
• Experience in designing and operating service architectures based on Java, Kotlin, and Spring Boot
• Experience in large-scale, high-throughput processing and performance optimization
• Experience in RDBMS or NoSQL design and performance improvement
• Experience building distributed architectures using Kafka, Redis, and messaging/caching systems
• Disaster response and non-disruptive deployment experience for a stable operating environment
• Business-level Korean and English proficiency (reading, writing, and verbal collaboration)

[Preferred Qualifications]

• Experience designing and operating shared platform services or developer-facing APIs with multiple user groups
• Experience in designing and operating systems where reliability and delivery guarantees are critical (notifications, data pipelines, gateways, or similar high-availability services)
• Service development experience in the financial domain or mission-critical environments
• Experience in designing and operating event-driven architecture or microservices architecture
• Experience operating cloud-based (AWS/GCP) infrastructure
• Experience in building CI/CD, test automation, and operations automation environments
• Experience with real-time service failure monitoring and emergency response
• Experience with LLM/AI-agent application infrastructure

[Required Documents]

• English resume and cover letter required; optional Korean version accepted (free format)
• (Optional) Attach GitHub/Tech Blog/Portfolio Link

+English communication may be required during the recruitment process, as some interviews and technical discussions are conducted in English.

Resume Writing Guide

• Please focus on the technical challenges you personally solved and examples of improvements rather than the project scope.
• It would be even better if you could write about examples of systemic improvements, such as fault response, performance enhancement, and automation.
• Please emphasize any experience where you played a leading technical role, such as building new systems or improving structures.

[Global Hiring Notice]

This position is open to global & local candidates. Work arrangements, employment terms, and requirements may be adapted according to local conditions and applicable regulations.

Contact: TA Team – recruit@nextsecurities.com

[Notes]

• Any falsified information found in the submitted materials or during the hiring process may result in cancellation of employment.
• To ensure smooth recruitment, simultaneous applications for multiple positions are not allowed. Please apply carefully.
• Recruitment is on a rolling basis and may close early once a successful candidate is selected.
• Interviews are typically one-on-one or panel-style and last up to one hour.