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Added 5 months ago
JA
Business Data Analyst (Capital Markets)
Jay Analytix
Toronto, ON
- Contract
…Enterprise teams to facilitate the broader adoption of the Data Strategy across Capital Markets. Engage and partner with QTS application teams moving onto the Data Insights platform,…
Added 3 months ago
C
Sr. AI Engineer – Agentic Systems
Chubb
Toronto, ON
- Full-time
This work is aimed at direct implementation. People on this team move between agentic work, systems engineering, and applied science as priorities shift. Less a multi-agent system than one…
Added 2 months ago
AI and Data - Senior Consultant - AI/ML Engineer
EY
Toronto, ON · Montreal, QC
Bachelor's degree in Computer Science, Engineering, or a related field.
Added 3 months ago
P
Concepteur/Conceptrice Circuits Intégrés Photoniques (PIC) (Montréal)
Pasqal
Montreal, QC
- $80,000 to $100,000 CAD / year
- Full-time
…photonic integrated circuits (PICs) for telecommunications, data center, and quantum technology applications. Aeponyx is a Canadian subsidiary of…
Added 3 months ago
C
Java Full Stack Developer - React JS - Assistant Vice President
Citi
Mississauga, ON
- Full-time
· Experience with Python for scripting or data manipulation.
Added 3 months ago
L
Digital Architect
Lightmatter
Toronto, Ontario
- Full-time
Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine,…
Added 3 months ago
L
Frontend/UI Developer
Larus
Ottawa, Ontario
- Full-time
We are looking for a UI/Frontend Developer to join the Larus team. You will design and build the interfaces through which military planners, analysts, and decision-makers make sense of…
Added 3 months ago
L
Data Scientist
Larus
Ottawa, Ontario
- Full-time
Python data analysis and manipulation tools (e.g. pandas, numpy, dask);
Added 3 months ago
SG
Lead Penetration Test Engineer
S&P Global
Toronto, Ontario
- $135,000 to $180,000 CAD / year
- Full-time
…modern security threats. Our mission is to safeguard systems and data by developing innovative solutions to the industry’s most complex security challenges. We are passionate problem…
Added 3 months ago
IE
Principal Machine Learning Architect
Index Exchange
Toronto, Ontario
- Full-time
At the core of it all is our engineering-first culture. Our engineers tackle internet-scale problems across tight-knit, global teams. From moving petabytes of data and optimizing with AI to…
Added 3 months ago
Strategy & Operations Co-op - Winter 2027
Canada Rocket Company
Toronto, ON
…operations - the four functions that determine how fast the engineering team can…
Added 2 months 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 3 months ago
J
Senior Software Engineer, Applied AI (Netherlands)
Justworks
Toronto, ON
- €143,000 to €184,000 EUR / year
…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…
Added 2 months ago
Senior Software Engineer, Applied AI (Spain)
Justworks
Toronto, ON
…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…
Added 3 months ago
AM
SoC DFX Scan / ATPG Engineer
Advanced Micro Devices, Inc
Ottawa, ON
- Full-time
At AMD, our mission is to build great products that accelerate next-generation computing experiences - from AI and data centers, to PCs, gaming and embedded systems. Grounded in a culture…
Added 3 months ago
Q
Engineer
Qualcomm
Markham, ON
- Full-time
Familiarity with data analysis, AI-assisted engineering tools, or emerging AI technologies that enhance engineering productivity.
Added 3 months ago
G
Full Stack Software Engineer
Gumloop
Vancouver, BC
- Full-time
…the problem build and share agents, manage their access to data, choose your AI models and host it all in your own…
Added 3 months ago
Design Verification Engineer - technical lead, Annapurna Labs
Amazon
Toronto, ON
As a member of the Cloud-Scale Machine Learning Acceleration team you’ll be developing hardware solution for AWS data center including AWS Inferentia,Trainium systems - custom designed…
Added 3 months ago
M
Applied AI, Forward Deployed Machine Learning Engineer
Mistral
Montreal, Quebec
- Full-time
Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems - across high-stakes…
Added 3 months ago
B
Professional, Engineering - Advanced Aerodynamics
Bombardier
Dorval, Quebec
- Full-time
…role will also include the liaison of activities with these engineering…
Added 3 months ago
B
Software Engineer - GPU Networking & Distributed Systems
Baseten
Montreal, Quebec
- $165,000 to $330,000 CAD / year
- Full-time
…applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing…
Added 3 months ago
M
Applied AI, Technical Lead, Forward Deployed AI Engineer
Mistral
Montreal, Quebec
- Full-time
Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems - across high-stakes…
Added 3 months ago
O
Senior Machine Learning Engineer in Medical Imaging
Oncoustics
Toronto, Ontario
- Full-time
…while effectively coordinating with signal processing, clinical data, and product teams. The ideal candidate will have strong expertise in processes, pipelines, operations, QA, and writing…
Added 3 months ago
O
Machine Learning Scientist (Graduate/Postdoc Level) - Contract
Oncoustics
Toronto, Ontario
- Contract
Adapt and optimize existing deep learning models for challenging data cases
Added 3 months ago
O
Senior DevOps Engineer, for AI-based Systems
Oncoustics
Toronto, Ontario
- Full-time
Familiarity with Python for machine learning and deep learning

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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