# of Openings:1Client:Investments IndustryType:6-Month Contract (targeted through September; extension possible but not guaranteed)Location:Downtown Toronto, ON (Mon-Thurs Onsite (4 days/week)) 37.5 hours/weekCollabera is seeking aSenior Java Software Engineerto support a large-scalemodernization initiativefocused on transforming legacy and third-party systems into scalable, cloud-based architectures.This is ahigh-impact, problem-driven role —not a ticket-based environment. The engineer will be expected toown problem spaces end-to-end, contributing to system design, architecture decisions, and hands-on development.The workplace consists of afragmented ecosystem of 50+ legacy and internally built applications, requiring strong system thinking, data handling experience, and the ability to operate in ambiguity.Day-to-Day Responsibilities:The Senior Java Engineer will focus ondesigning and building scalable backend systemswhile driving modernization efforts across a complex application landscape.A significant portion of the role involvesanalyzing, decomposing, and re-architecting legacy systems, including migrating workloads to AWS (EC2, RDS) and improving overall system performance, reliability, and maintainability.They will build services responsible fordata ingestion, transformation, validation, and distribution, working with data-heavy workflows (including market data).The engineer will also play a key role insystem design and architecture, making pragmatic tradeoffs (e.G., scalability vs simplicity) and ensuring solutions are production-ready.Additional responsibilities includetroubleshooting complex production issues(e.G., memory leaks, concurrency issues, latency bottlenecks), implementingobservability practices (logging, metrics, tracing), and buildingresilient systems(retries, failure handling,



circuit breakers).The remaining portion of the role includescollaborating with engineers and stakeholders, helping clarify ambiguous requirements, shaping solutions, and providingtechnical leadership through code reviews and mentorship .Must-Haves:8-10+ years of experience as aJava Backend EngineerStrong expertise inCore Java(collections, concurrency, JVM internals, memory model)Experience withperformance tuning, garbage collection, and profilingHands-on experience withSpring (Boot, MVC, Data)andHibernate/JPAStrongsystem design and distributed systems knowledge(caching, messaging, eventual consistency)Experience withAWS or cloud-based architecturesStrongSQL and data handling experienceProven ability totroubleshoot complex production issuesExperience building systemsbeyond simple CRUD APIs(data pipelines, processing systems, etc.)Ability tooperate in ambiguity and define solutions—not just execute tasksPlusses:Experience withdata-intensive systems or data pipelinesExposure tomicroservices architecture(Spring ecosystem)Background incapital markets / financial servicesExperiencemodernizing or replacing legacy systems at scaleFamiliarity withCI/CD pipelines and DevOps practicesWe may use AI-enabled and/or automated tools to support parts of our recruitment process, including application screening, interview scheduling, and candidate communications. These tools are used to enhance consistency and efficiency. All hiring decisions involve human review and are not based solely on automated processing.The Company offers a total rewards package in accordance with all applicable federal, provincial, and local laws and requirements. Benefit eligibility and offerings vary based on role, employment status, and work location. For contractor positions, benefits are limited to those entitlements and protections required by applicable law, which may include (as applicable) vacation pay, public holidays, leaves of absence, and other legally mandated benefits or payments.#J-18808-Ljbffr

📌 Expert Java Software Engineer Onsite Role (Winnipeg)
🏢 Altimetrik
📍 Winnipeg