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Added 3 months ago
K
Software Developer - Backend_Immediate Joiner's
Kite
Quebec, Quebec
- Full-time
…and payments platforms. The ideal candidate is proficient in Java, Spring Boot, PostgreSQL, Kafka, REST APIs, and Test-Driven Development (TDD), and is comfortable working in an AI-assisted…
Added 2 months ago
GD
Senior Engineer I
Groupe Dynamite
Mont-Royal, Quebec
- Full-time
2+ years of experience extending software applications using .NET Framework or Java;
Added 3 months ago
KC
Manager, GRC
KPMG Canada
Toronto, Ontario
- Full-time
Technical skills Java, JavaScript; REST/SOAP, JSON/XML; Python/PowerShell; SQL.
Added 2 months ago
MS
Full Stack – Java Application Developer (Hybrid)
Morgan Stanley
Montreal, QC
- Full-time
We’re seeking someone to join our Credit Valuation Adjustment (CVA) Technology team as an Full Stack – Java Application Developer to drive the design and delivery of next-generation risk…
Added 1 month ago
Staff Software Engineer, Product Risk
Stripe
Toronto, ON
Knowledge of a backend development language (such as Scala, Java, or Go) and strong SQL experience
Added 3 months ago
TS
Sr. Software Developer - Hybrid/Secret Cleared
The Source Staffing
ON · Ottawa West, Ontario
- Full-time
Senior Software Developer - Hybrid/Secret Cleared 90-110k
Added 2 months ago
FC
Quality Assurance Analyst, Investly
Fidelity Canada
Toronto, ON
- Full-time
Working experience in JS, Java, Python or other modern programming language
Added 1 month ago
RB
Senior Software Developer, Workday Integrations & Extend
Royal Bank of Canada
Toronto, ON
- Full-time
As a Senior Software Developer, Workday Integrations & Extend, you will lead the technical design, development, and implementation of Workday solutions to meet complex HCM program…
Added 2 months ago
R
Senior Software Developer, Workday Integrations & Extend
RBC
Toronto, ON
- Full-time
As a Senior Software Developer, Workday Integrations & Extend, you will lead the technical design, development, and implementation of Workday solutions to meet complex HCM program…
Added 2 months ago
CT
Product Verification Technologist II
COMTECH TELECOMMUNICATIONS
Gatineau, QC
- Full-time
Understanding of scripting in one or more mainstream scripting languages (JAVA, Python) would be beneficial.
Added 2 months ago
MC
Data Scientist
Meridian Credit Union
Toronto, ON
- Full-time
Knowledge of programming languages such as Python or Java.
Added 2 months ago
Senior Principal Site Reliability Engineer
Questrade Financial Group
Toronto, ON
Added 1 month ago
Angular or React Full Stack Developer - onsite Mississauga CA
Capgemini
Mississauga, ON
Extensive experience with Java and the Spring Boot framework for building high-performance back-end services.
Added 1 month ago
AI and Data - Manager - AI Engineer
EY
Toronto, ON
Advanced object-oriented coding skills in Python for production-level codebases. Familiarity with Java, TypeScript/JavaScript is a plus.
Added 2 months ago
C
Java Full Stack Developer - React JS - Assistant Vice President
Citi
Mississauga, ON
- Full-time
The position is for a senior full-stack developer with 6-8 years of experience, specializing in building enterprise-scale applications. This role is suited for a strong React-focused full…
Added 2 months ago
I
Technology Lead - DevOps
Infosys
Mississauga, Ontario
- Full-time
Experience building and maintaining CI/CD for modern application stacks (e.g., .NET/Java/Node, containers), including approvals, gates, and quality checks.
Added 2 months ago
SG
Lead Penetration Test Engineer
S&P Global
Toronto, Ontario
- $135,000 to $180,000 CAD / year
- Full-time
Experience with Java application technologies, deployment frameworks, and associated security best practices.
Added 4 months ago
S
Java Software Engineer
Synechron
Calgary, Alberta
- $100,000 to $110,000 CAD / year
- Full-time
We are seeking a highly skilled Senior Core Java Developer with extensive experience in multithreading, collections, data structures, and banking domain expertise. The ideal candidate will…
Added 1 month ago
Java Full stack Developer
Capgemini
Toronto, ON
· Experience and knowledge with Java, J2EE, Spring, Spring Boot, RESTful APIs, Microservices, and NoSQL/SQL databases.
Added 1 month ago
Java Developer
Capgemini
Montreal, QC
We are looking for a strong java developer to join RIM team and help deliver key initiatives. The applicant should be a solid Java programmer, with strong design and implementation…
Added 1 month ago
Java Delivery Manager
Capgemini
Montreal, QC
You will bridge the gap between technical execution and business strategy, managing cross-functional teams building high-performance Java and Angular solutions.
Added 2 months ago
J
Senior Software Engineer, Applied AI (Netherlands)
Justworks
Toronto, ON
- €143,000 to €184,000 EUR / year
Golang, Ruby on Rails, Javascript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Git, Memcache, Redis, ElasticSearch, Docker, Terraform, Kubernetes, CircleCI, DataDog
Added 1 month ago
Senior Software Engineer, Applied AI (Spain)
Justworks
Toronto, ON
Golang, Ruby on Rails, Javascript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Git, Memcache, Redis, ElasticSearch, Docker, Terraform, Kubernetes, CircleCI, DataDog
Added 1 month ago
GM
Staff Android Developer – Infotainment
General Motors
Markham, ON
- Full-time
The Staff Android Developer – Infotainment is a senior technical leader responsible for designing, building, and evolving in-vehicle Android applications and platform components that power…
Added 1 month ago
Manager, Automotive Strategy Enablement
Scotiabank
Toronto, ON

Justworks

Senior Software Engineer, Applied AI (Spain)

Toronto, ON, Canada

The base wage range for this position based in Spain is 111,000-143,000 EUR.

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Job details

Pay: The base wage range for this position based in Spain is 111,000-143,000 EUR.
Experience: 5+ years of backend engineering experience building and operating production systems
Posting language: English
Posted: Aug 13, 2026

Original job description

Who We Are

At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people.

We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you.

We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team.

Our Values

If this sounds like you, you’ll fit right in.

Who You Are

You are self-driven and like to work with others to remove roadblocks. You are curious and love to explore and learn new technologies. You have demonstrated the ability to build, deploy, and maintain large-scale, complex applications. You care more about solutions and impacting the customer experience than using a particular tool or framework.

About the role:

You will join a small, highly autonomous cross-functional team to build AI agents that fundamentally transform how operations work at scale. Instead of writing bespoke software for every workflow, we are developing an agent platform that can read operational knowledge, reason about it in context, and execute tasks end-to-end. This approach allows us to scale complexity through knowledge and reasoning, rather than simply through code.

This is an opportunity to join a foundational team, which currently consists of fewer than five engineers. The work spans critical areas including LLM-powered agent design, robust backend service architecture, tool and integration development, and sophisticated knowledge infrastructure.

We are seeking a Senior Software Engineer with a strong passion for building AI-native systems in a product environment. The ideal candidate will be able to take ownership of large segments of the technology stack, make pragmatic technical decisions in ambiguous and emerging territory, and consistently ship high-quality, production-ready systems that our users rely on every day.

Responsibilities:

Design, build, and own core components of the agent platform, from the orchestration layer to the tool integrations connecting it to internal systems.
Build and evolve the capabilities layer: APIs, data access patterns, and service integrations for agents to execute operational workflows.
Architect the knowledge and memory infrastructure, allowing agents to retrieve the data and act across our systems.
Design and implement the trust and safety framework, including audit trails, human-in-the-loop controls, and guardrails for safe and auditable AI-driven operations.
Contribute to agent evaluation and testing infrastructure, defining how we measure accuracy, reliability, and regression across agent behaviors.
Partner directly with Operations to understand workflows, identify automation opportunities, and translate process knowledge into agent capabilities.
Mentor other engineers on the team as it grows.

About the candidate

You are comfortable in a fast-paced, early-stage environment. You demonstrate a "scrappy" and resourceful approach, proactively identifying solutions and unblocking yourself without needing a fully defined path.
You are pragmatic and balance quality with speed. You understand when to optimize for long-term durability and when to iterate quickly. You prioritize pragmatism over being overly precious about code, but never compromise on quality in a way that creates future issues.
You are product-minded. You look beyond the immediate task, seeking to understand the "why" behind the build and questioning whether it's the right product solution. You are comfortable contributing product thinking alongside engineering work.
You demonstrate a strong ownership mindset. You are proactive, identify gaps, and drive initiatives to completion without waiting for explicit instructions. When encountering issues or ambiguity, you address them directly.
You possess strong backend engineering fundamentals. You can confidently design, build, and operate production systems.
You are curious and eager to develop expertise in AI and LLMs. While deep research is not required, you are motivated to build practical, real-world products using these tools, specifically focusing on agent systems.

Qualifications

5+ years of backend engineering experience building and operating production systems
Hands-on experience with LLMs and AI agents (orchestration, RAG, tool/function calling, or similar)
Strong API design and system integration skills
Product-minded: questions requirements and contributes to product decisions, not just execution
Proven ownership of complex projects in ambiguous, early-stage environments

Technologies Used

Golang, Ruby on Rails, Javascript, Java, C#, Python, VueJS, MySQL, Kafka, AWS, Git, Memcache, Redis, ElasticSearch, Docker, Terraform, Kubernetes, CircleCI, DataDog

The base wage range for this position based in Spain is 111,000-143,000 EUR.

Actual compensation is based on multiple factors that are unique to each candidate, including and not limited to skill set, level of relevant experience, and specific work location. Salary ranges for positions based in other locations may differ based on the cost of labor in that location.

For more information about Justworks’ Total Reward Philosophy, including all of the perks and benefits we are proud to offer our team members, please visit Total Rewards @ Justworks.

Diversity At Justworks

Justworks is committed to maintaining a workplace where diversity of identity, culture, and life experience is the norm and is celebrated authentically and respected consistently. Diversity in our work, our people, and our product drives creativity and innovation, entrepreneurial leadership and integrity, competitiveness, and collaboration throughout our business and in the market. We depend on our differences to make our team stronger, our workplace more dynamic, and our product accessible to all of our customers.

We’re proud to be an equal opportunity employer open to all qualified applicants regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital or familial status, disability, pregnancy, gender identity or expression, veteran status, genetic information, or any other legally protected status. Justworks is fully dedicated to providing necessary support to candidates with disabilities who may require reasonable accommodations. We also provide reasonable accommodations to employees based on their sincerely held religious beliefs, as well as for other covered reasons consistent with applicable federal, state, and local laws. If you're in need of a reasonable accommodation, please reach out to us at accommodations@justworks.com. Your comfort and success matter to us, and we're here to ensure an inclusive experience.

Our DEIB Report

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More about this job

Responsibilities

Design, build, and own core components of the AI agent platform, including orchestration layers and tool integrations. Architect robust knowledge and memory infrastructure while implementing trust, safety, and evaluation frameworks for AI-driven operations.

Requirements

Requires 5+ years of backend engineering experience with a focus on building and operating production-ready systems. Candidates must have hands-on experience with LLMs, AI agents, and strong API design skills in an early-stage environment.

Skills

Golang
Ruby on Rails
Python
LLMs
AI agents
Backend engineering
API design
System integration
RAG
Orchestration
Kubernetes
AWS
Docker
Terraform
Data architecture
Product-minded

Benefits

Wellness program
Company retreats

Visa sponsorship

Not detected in the job text

Keywords

Golang
Ruby on Rails
Javascript
Java
C#
Python
VueJS
MySQL
Kafka
AWS
Git
Memcache
Redis
ElasticSearch
Docker
Terraform
Kubernetes
CircleCI
DataDog
LLMs
AI Agents
RAG
Orchestration
Backend Engineering
API Design
System Integration
Cloud Infrastructure
Product-minded
Software Engineering
Artificial Intelligence

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