Role Summary

We’re seeking a seasoned

Senior Java Back - End Developer

with 5+ years of experience to lead end-to-end technical design and delivery of mission‑critical systems. You will own architecture decisions, drive engineering excellence, mentor senior engineers, and partner with product, security, and platform teams to build scalable, reliable, and secure distributed systems. Key Responsibilities:

Architecture & Design

Define and evolve system architecture for

cloud-native, microservices/event-driven

platforms (scalability, resilience, security, cost). Create

high-level and low-level designs , integration patterns, API contracts, and reference implementations. Lead design reviews; ensure alignment with

domain-driven design (DDD) ,

12‑factor

principles, and organization standards.

Engineering Leadership

Lead squads through

full SDLC —from discovery and PoCs to production and SRE handoff. Establish

coding standards , code review practices, and

secure-by-default

patterns. Mentor and coach senior engineers; support career growth and succession of technical leaders.

Hands-on Development

Build core services using

Java (17+) ,

Spring Boot ,

REST/GraphQL , and message/event streaming. Optimize for

performance, concurrency, observability , and

operational excellence

(SLOs, error budgets). Drive quality with

unit/integration/contract testing , test data strategy, and automated quality gates.

Cloud & Platform

Design for

AWS/Azure/GCP , container orchestration ( Kubernetes ),

service mesh , and

CI/CD .



Implement

infrastructure-as-code (IaC)

patterns and secrets management. Partner with SRE/Platform teams on

monitoring, alerting, logging, tracing , and cost governance.

Data & Integration

Architect integrations across

SQL/NoSQL ,

caching

(Redis), and

event streams

(Kafka/Pulsar). Define

data contracts , schema evolution strategies, and

idempotent/eventual consistency

patterns.

Security & Compliance

Embed

AppSec

best practices,

OWASP

controls, secure API/auth (OAuth2/OIDC), and

zero trust

patterns. Ensure compliance with

regulatory

and

audit

requirements where applicable.

Stakeholder Partnership

Translate business needs into technical roadmaps and

architecture runway . Communicate trade-offs and decisions to both technical and non-technical audiences.

GenAI :

Knowledge of MCP, A2A, Agentic Architecture Required Qualifications:

5+ years

of progressive experience building enterprise systems, with

5+ years

in

Java

and

Spring

at scale. Proven delivery of

cloud-native ,

microservices , and

event-driven

architectures. Solid expertise in:

Java 11/17+, Spring Boot,



Spring Cloud REST/GraphQL APIs , gRPC (nice-to-have) Kafka

(or Pulsar),

Kubernetes ,

Docker RDBMS

(PostgreSQL/MySQL/Oracle) and

NoSQL

(MongoDB/Cassandra/DynamoDB) Caching

(Redis),

CI/CD

(GitHub Actions/Azure DevOps/Jenkins),

IaC

(Terraform/ARM) Observability

(OpenTelemetry, Prometheus/Grafana, ELK),

feature flags /progressive delivery

Solid grasp of

concurrency ,

performance tuning ,

resiliency patterns

(circuit breakers, retries, bulkheads), and

fault-tolerance . Demonstrated leadership of

architectural forums ,

design reviews , and

mentorship . Strong communication and stakeholder management skills. Nice-to-Have:

Domain knowledge:

Payments, banking, capital markets, insurance, e-commerce, supply chain, or telecom. Security:

Threat modeling, shift-left security, SAST/DAST, secrets rotation, mTLS. Data:

CDC (Debezium),

schema registry ,

exactly-once semantics , streaming ETL. Platform:

Service mesh (Istio/Linkerd), API gateways (Kong/Apigee), Serverless (Lambda/Functions). Modern patterns:

CQRS, event sourcing, Saga orchestration, hexagonal architecture. Education:

Bachelor’s degree/University degree or equivalent experience Job Family Group:

Job Family:

Time Type:

Full time Primary Location Full Time Salary Range:

$94,300.00 - $141,500.00 Most Relevant Skills

Please see the requirements listed above. Other Relevant Skills

For complementary skills, please see above and/or contact th

📌 Senior Java Back (Mississauga)
🏢 Citigroup
📍 Mississauga