Java Developer

Apptoza Inc.; Vancouver; On-site; CAD 120,000 - 165,000; Full time

Benefits offered by this job

Health insurance

Remote/onsite flexibility

Job summary

Apptoza Inc. in Vancouver seeks a Senior Software Engineer to strengthen our backend team, delivering high-throughput, low-latency services powering data pipelines.

You will design, implement, and scale Java-based components, work with DevOps, build event-driven systems using Kafka/RabbitMQ, and ensure secure, observable platforms with CI/CD.

Qualifications

• 5+ years of backend development experience in large-scale environments.
• Strong Java proficiency (8+), multithreading and performance optimization.
• Linux fundamentals and shell operations.
• Extensive experience with Message Queues (Kafka/RabbitMQ/ActiveMQ).
• Asynchronous programming and non-blocking IO expertise.
• CI/CD expertise with Jenkins and DevOps tooling.
• Ability to design scalable architectures and lead initiatives.
• Basic understanding of authentication/authorization concepts.

Responsibilities

• Design, implement, and optimize backend services for high-volume data flows.
• Develop Java-based components using Spring/Spring Boot or equivalent.
• Build event-driven workflows using MQ/Kafka/RabbitMQ.
• Ensure sub-second latency and 99.99% availability with observability.
• Lead solutioning and system designs across distributed systems.
• Automate testing (unit/integration/load) and CI/CD workflows.
• Apply secure-by-design principles including zero-trust patterns.
• Support authentication/authorization patterns (OAuth2, mTLS, JWT).
• Participate in architecture reviews and mentor junior engineers.
• Diagnose production issues across infrastructure, code, and messaging.
• Improve logging, monitoring, and operational tooling.

Skills

Java

Backend development

Linux fundamentals

Asynchronous programming

CI/CD

System design

Security concepts

Mentorship

Tools

Jenkins

Docker

Kubernetes

Terraform

PCF CLI

Chef Infra

Chef Habitat

IBM MQ

Kafka

RabbitMQ

ActiveMQ

OAuth2

mTLS

JWT

Job description

\"We are seeking a highly skilled Senior Software Engineer to join our backend engineering team. This role focuses on designing and delivering high-throughput, low-latency, and resilient services that power mission-critical data processing pipelines. You will work closely with architecture, DevOps, and product teams to build scalable systems that support millions of transactions daily.

Key Responsibilities

• Design, implement, and optimize backend services handling high-volume data flows with strict performance and reliability requirements.


• Develop Java-based components using modern frameworks (Spring/Spring Boot or equivalent).


• Build and maintain asynchronous and event-driven workflows using messaging systems such as MQ/Kafka/RabbitMQ.


• Implement performance tuning, profiling, and observability to support sub-second latency and 99.99% availability goals.


• Drive solutioning and system designs for new features, integrations, and platform enhancements across distributed systems.


• Ensure service robustness through automated testing (unit, integration, load tests) and CI/CD workflows.


• Apply secure-by-design principles, including threat modeling, safe data handling, API hardening, and least-privilege access.


• Implement and support authentication and authorization patterns (e.g., OAuth2, mTLS, JWT, service-to-service auth).


• Participate in architecture reviews, offering technical leadership and mentorship to junior engineers.


• Diagnose and resolve complex production issues across infrastructure, code, and messaging layers.


• Enhance platform reliability via improved logging, monitoring, alerting, and operational tooling.

Required Qualifications

• 5+ years of hands-on backend development experience in large-scale, high-throughput environments.


• Strong proficiency in Java (Java 8+, multithreading, concurrency libraries, performance optimization).


• Solid understanding of Linux fundamentals (filesystem, networking basics, shell operations, performance tools).


• Extensive experience with Message Queue systems (IBM MQ, Kafka, RabbitMQ, ActiveMQ, etc.).


• Deep knowledge of asynchronous programming, non-blocking IO patterns, and event-driven system design.


• Good understanding of modern network protocols, including:


• HTTP/2 (multiplexing, header compression, flow control, performance benefits)


• Experience implementing and maintaining CI/CD pipelines and DevOps tooling, including:


• Jenkins


• Chef Infra / Chef Habitat


• Terraform


• PCF CLI


• Demonstrated ability to design scalable system architectures and evaluate design trade-offs.


• Basic understanding of Authentication/Authorization concepts and secure communication patterns.


• Familiarity with containerization and orchestration (Docker, Kubernetes) is an asset.


• Excellent debugging, problem-solving, and performance-profiling skills.

Preferred Qualifications

• Experience in financial services, real-time scoring, risk systems, or other low-latency domains.


• Exposure to observability stacks (Splunk, Prometheus, Grafana, ELK).


• Knowledge of DevOps practices, automation, and additional IaC tools.


• Hands-on understanding of reliability engineering (circuit breakers, retries, backpressure, failover strategies).


• Ability to lead complex technical initiatives and drive cross-team alignment.

What We Look For

• A strong ownership mindset with a passion for delivering secure, high-quality, and resilient services.


• Ability to influence architecture, mentor engineers, and uplift engineering standards.


• Strong communication skills and the ability to work in a fast-paced, collaborative environment. \"