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Added 13 hours ago
O
Senior Software Developer
OSEDEA
Montréal, QC
- Full-time
- Hybrid
Has 5+ years experience as a software developer or engineer with at least 2 recent years in modern popular programming languages such as Python, Javascript/typescript, and/or Java
Added 13 hours ago
M
Principal Software Development Engineer - XBOX Product Growth
Microsoft
Canada
- $142,400 to $257,500 CAD / year
- Full-time
- On-site
…languages including, but not limited to, C, C++, C#, XAML, Java, JavaScript, TypeScript, or Python OR equivalent…
Added 13 hours ago
RC
Senior Software Developer - Back End
Randstad Canada
Toronto, ON
- Contract
We are seeking an experienced Senior Software Developer - Back End to manage the interchange of data between servers and user-facing applications while engineering robust, accessible, and…
Added 13 hours ago
M
Senior Product Manager
modis
Toronto, ON
- Contract
- Temporary
…including Microsoft Dynamics 365 CRM, MuleSoft middleware, and a Java/React-based portal. The successful consultant will lead product planning, prioritization, stakeholder engagement, and…
Added 13 hours ago
M
Senior Back End - Software Developer
modis
Toronto, ON
- Contract
- Temporary
Position: Senior Back End - Software Developer
Added 13 hours ago
A
A.6 Programmer/Software Developer 3
Altis
Ottawa, ON
- $80 to $85 CAD / hour
- Contract
Working with technologies such as Java, React, Python, and GraphQL, you'll help deliver secure, scalable solutions that support critical cybersecurity operations and protect Canada's…
Added 13 hours ago
FI
Software Developer
Fidelity Investments Canada ULC
Toronto, ON
- Full-time
Strong understanding of Internet programming languages (Java, Angular JS, React, JavaScript, HTML/HTML5, XHTML, CSS, CSS3, jQuery, Spring, Spring Boot).
Added 13 hours ago
M
Senior Full Stack - Software Developer
modis
Toronto, ON
- Contract
- Temporary
…and support FHIR-based event processing solutions utilizing Java, Node.js, AWS Lambda, React, SMART on FHIR, NextGen Connect (Mirth), and HL7 v2…
Added 13 hours ago
RC
Senior Software Developer - Full Stack
Randstad Canada
Toronto, ON
- Contract
We are seeking an experienced Senior Software Developer - Full Stack to lead the architecture, design, implementation, and integration of event-driven digital health applications. In this…
Added 13 hours ago
Remote & 2 openings! Software Developer - Full Stack - Senior - 6 Ms contract
Dimensional Tech Inc.
Toronto, ON
Demonstrated FHIR Subscription and SubscriptionTopic implementation experience using Java, Node.js, AWS Lambda, and asynchronous queues, including topic and event design, subscription…
Added 13 hours ago
E
EverCommerce - Staff Engineer
Evercommerce
ON
- $160,000 to $190,000 CAD / year
- Full-time
…automation portals using modern frontend technologies (TypeScript, React, Next.js) paired with Java backend…
Added 13 hours ago
P
Intermediate - Full Stack (Java, React, OpenShift)
Procom
Toronto, ON
- $52.5 to $70 CAD / hour
This position is hybrid with 3 days in office.
Added 13 hours ago
P
Senior Lead Java Developer
Procom
Mississauga, ON
- $66 to $88 CAD / hour
On behalf of our Financial Services client, Procom is searching for a Senior Lead Java Developer for a 6 month contract role. This position is a hybrid position with 3 days onsite at our…
Added 13 hours ago
P
Senior - Full Stack (Java, React, OpenShift)
Procom
Toronto, ON
- $67.5 to $90 CAD / hour
Senior - Full Stack (Java, React, OpenShift):
Added 13 hours ago
FI
Software Developer
Fidelity Investments Canada ULC
Toronto, ON
- Full-time
We are looking for a Java Software Developer, a Full Stack Developer, who will take a key role on our team. Capabilities for this role include being able to build applications in Java,…
Added 13 hours ago
C1
Full Stack Software Engineer
Company 19 - John Hancock Life Insurance Company (U.S.A.)
Waterloo, ON · Toronto, ON
- Full-time
Design, build, and maintain modern full-stack applications using React, TypeScript/JavaScript, HTML, and CSS on the front end.
Added 13 hours ago
IG
Lead Java Developer - Market Rates
Insight Global
Toronto, ON
- Contract
Insight Global is seeking a lead Java developer in Toronto for a Canadian Tier 1 Bank, working on its Rates Derivative Pricing System. You will be the primary point of contact for traders,…
Added 13 hours ago
M
AI Software Engineer
Mash
Toronto, ON
- Full-time
Application: Python (FastAPI, Pydantic, SQLAlchemy), TypeScript, React Native with Expo, Next.js.
Added 13 hours ago
M
Software Engineer
Mash
Toronto, ON
- Full-time
Application: Python (FastAPI, Pydantic, SQLAlchemy), TypeScript, React Native with Expo, Next.js.
Added 13 hours ago
AP
Intermediate Frontend Software Developer
Agility PR Solutions
Ottawa, ON
- $75,000 to $110,000 CAD / year
- Full-time
- On-site
As a Front End Developer you will be responsible for the development of web applications using Angular as the frontend framework. Our teams use an Agile Software development process to…
Added 13 hours ago
AP
Senior Full Stack Developer
Arobas Personnel Inc.
Montréal, QC
- Full-time
Design, develop, and enhance full stack applications using React and Java
Added 13 hours ago
Software Developer - Senior -Java/React
Bevertec
Toronto, ON
Job Role: Software Developer – Senior (Dynamics 365 CRM with Java/React exp)
Added 13 hours ago
Software Engineer
Prompt.io Inc.
Canada
Experience with front-end frameworks such as React.
Added 13 hours ago
RC
Senior Software Developer
Randstad Canada
Toronto, ON
- Contract
We are seeking an experienced Senior Software Developer to provide hands-on technical leadership, solution architecture, and full-stack application delivery for enterprise CRM, Customer…
Added 13 hours ago
C1
Lead Engineer, Agentic Solutions & Automation
Company 19 - John Hancock Life Insurance Company (U.S.A.)
Toronto, ON · Waterloo, ON
- Full-time
…systems, and cloud-native services using technologies such as Java, .NET, Python, Node.js, React, and…

Mash

AI Software Engineer

Toronto, ON, Canada

Full-time

Apply on mash.com About employer

Applications open in a new tab.

Job details

Job type: Full-time
Posting language: English
Posted: Aug 11, 2026

Original job description

Culture

We treat your time as the scarce asset that it is. We respect people being heads-down and having the time to get into a flow. Distractions and context switching are things we work to minimize. We have meetings for specific purposes, and leverage async channels when appropriate.

Mash has an open and direct culture. We believe that not making a decision is a decision - and a terrible one at that. We have strong conviction and a bias for action. We can agree to disagree, and move forward after reviewing the details. As we learn, we will reevaluate, iterate and push forward.

About Mash

We’re a dynamic team with experience at startups, and scaling products at big tech including Google, Amazon, Ada, D2L, CourseHero, Rakuten, Dayforce, PagerDuty, ROSS Intelligence & Lazer. We have top AI staff, including from programs such as MScAC, and advisors that have built startups and led some of the largest organizations in big-tech over the past 15 years.

We don’t use any seniority titles, and plan not to for as long as feasibly possible (learn more about why).

Mash investors include Whitecap Venture Partners, Castle Island Ventures, Maple VC, Strategic Cyber Ventures, Aquanow, Spacecadet, and angel investors including Sunny Madra (formerly Groq, now NVIDIA), Balaji Srinivasan (former CTO of Coinbase, author of The Network State), Austin Hill (co-founder of Zero-Knowledge Systems and Blockstream), Josh Troy (multi-startup CFO/co-founder, including Urbint) and John Pfeffer (former partner at KKR, co-founder of Pfeffer Capital).

Role & responsibilities

As an AI-focused software engineer on the Mash team, you will:

Ship core AI features within the Mash platform.
- Architect LLM-powered solutions and manage related infrastructure.
- Apply information retrieval techniques for search and retrieval-augmented generation (RAG), working with embedding models and vector databases.
- Develop processes and tooling for measuring and iterating on LLM output quality, leveraging eval frameworks and observability platforms.
- Create tooling to collect and leverage internal datasets for evaluation, few-shot prompting, fine-tuning and more.
- Develop bespoke ML/NLP models, when appropriate.
Build production data pipelines to ingest knowledge sources.
Stay up to date on cutting-edge research in the ML/NLP space and identify opportunities to apply new techniques within the Mash platform.
Work closely with a cross-functional team (product, design, engineering).
Discover and understand user needs.

Our stack

AI: We keep up with the state of the art and use whatever works best. Lately that means a bespoke agent harness, frontier and open-weight LLMs, decision models, speech-to-text and vision models, traditional NLP models, retrieval systems (graph, vector and keyword), and lots more.
Application: Python (FastAPI, Pydantic, SQLAlchemy), TypeScript, React Native with Expo, Next.js.
Data: Postgres, Cloud Storage, Prefect.
Infrastructure: GCP (Cloud Run, Cloud SQL, Pub/Sub, Eventarc), Terraform, Docker, Dagger, Kubernetes, Tilt, OpenTelemetry.

Skill set

4+ years of building production software at scale with a multi-year focus on AI.
Proficiency in 1+ programming languages, such as Python, Go, Rust, C++, or Java.
You’ve shipped LLM-powered features to real users: agents and tool calling, context design, retrieval and structured outputs.
You’ve built evals, datasets or regression checks that drive meaningful and provable improvement in a customer/user experience.
Experience with event-driven systems, building cloud-native software (with cloud providers such as Google Cloud Platform, Amazon Web Services, Microsoft Azure, etc.), working with data (both structured and unstructured) and developing data pipelines.
Strong understanding of backend system design and scalable architectures.
You use AI coding agents as a normal part of how you build.
Bonus: agent harnesses, structured interactions, speech or audio pipelines, entity resolution, sandboxing and isolation, privacy-preserving ML.

Cultural fit

We’re looking for an individual who:

Responds well to open-ended problems and thrives on autonomy - is a self-starter and problem solver.
Thrives in collaborative environments and is laser-focused on team goals.
Has great communication skills.
Has a passion for lifelong learning.
Has strong user empathy, and a user experience first mindset.

How to apply

Please reach out to us at careers@mash.com - and include a bit about yourself, your resume, and three bullet points about why you are specifically interested in the position.

Apply on mash.com About employer

More about this job

Responsibilities

The AI software engineer at Mash will build LLM-powered features, retrieval systems and evaluation tooling for the platform. They will also build data pipelines, work with product and design teams, and learn user needs.

Requirements

Candidates need 4+ years of production software experience with an AI focus, shipped LLM features to real users, and experience with cloud-native and event-driven systems. They should be proficient in at least one programming language and use AI coding agents in their daily work.

Skills

Python
FastAPI
Pydantic
SQLAlchemy
TypeScript
React Native
Expo
Next.js
Postgres
Prefect
Google Cloud Platform
Cloud Run
Cloud SQL
Pub/Sub
Eventarc
Terraform
Docker
Dagger
Kubernetes
Tilt
OpenTelemetry
LLM development
agent tool calling
retrieval-augmented generation
vector databases

Keywords

AI Software Engineer
LLM
RAG
retrieval-augmented generation
embedding models
vector databases
evals
observability
NLP
machine learning
Python
FastAPI
Pydantic
SQLAlchemy
TypeScript
React Native
Expo
Next.js
Postgres
Prefect

Tools

Python
FastAPI
TypeScript
React Native
Next.js
Postgres
Prefect
Google Cloud Platform
Terraform
Kubernetes

Languages

English

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Work requirements

Jobs in Canada