CrawlJobs Logo

Senior Software Engineer, Backend (AI Agent)

Canada, Toronto · Job Posted December 07, 2025
Apply Position
Job Link Share

Job Description

At Cresta, the AI Agent team is on a mission to create state-of-the-art AI Agents that solve practical problems for our customers. We are focused on leveraging the latest technologies in Large Language Models (LLMs) and AI Agent systems, while ensuring that the solutions we develop are cost-effective, secure, and reliable. This role will involve hands-on work on cutting-edge projects, requiring innovative and passionate software engineers who can bring research into practical, scalable applications. As a Senior Software Engineer, your goal will be to ensure that our AI Agents are backed by the most reliable and scalable server solutions. This includes designing and maintaining the server architecture that handles real-world, high-volume interactions and ensures high availability and performance. While we’re focused on server optimization and data management rather than pure research, you’ll be working with some of the most advanced technologies in the cloud and server space. This is a unique opportunity to shape the future of AI at Cresta by solving complex problems and bringing breakthrough AI advancements into production environments.

Job Responsibility

  • Design, develop, and maintain scalable and robust backend architectures for Cresta’s AI Agent solutions and proprietary models
  • Collaborate with cross-functional teams including frontend engineers, machine learning engineers to ensure seamless integration of AI Agents into Cresta’s customer solutions
  • Lead initiatives to enhance system scalability and reliability in production environments, focusing on backend services that support AI functionalities
  • Drive efforts to optimize server response times, process large volumes of data efficiently, and maintain high system availability
  • Innovate and implement security measures, cost-reduction strategies, and performance improvements in backend systems supporting AI Agents

Requirements

  • Bachelor’s degree in Computer Science or a related field
  • 5+ years of experience in backend system architecture, cloud services, or related technology fields
  • Proficient in designing and maintaining clear and robust APIs with a strong understanding of protocols including gRPC, REST
  • Previous experience working with Virtual Agent or AI Agent systems
  • Experience in high-performance database schema design and query optimization, including knowledge of SQL and NoSQL databases
  • Experience in containerized application deployment using Kubernetes and Docker in microservices architectures
  • Experience with cloud environments such as AWS, Azure, or Google Cloud, with a strong understanding of cloud security and compliance standards

What we offer

  • We offer Cresta employees a variety of medical, dental, and vision plans, designed to fit you and your family’s needs
  • Paid parental leave to support you and your family
  • Monthly Health & Wellness allowance
  • Work from home office stipend to help you succeed in a remote environment
  • Lunch reimbursement for in-office employees
  • PTO: 3 weeks in Canada

Looking for more opportunities?

Search for other job offers that match your skills and interests.

Similar Jobs for

Senior Software Engineer, Backend (AI Agent)

8 matching positions

Senior Software Engineer, Backend (AI)

We’re looking for a Senior Backend Engineer to join our newly formed AI R&D pod—...
Location
Location
United States , New York City
Salary
Salary:
200000.00 - 225000.00 USD / Year
posh.vip Logo
Posh
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 3–6+ years of backend or full-stack engineering experience, with a proven track record of shipping high-quality, scalable systems in fast-paced environments
  • Deep expertise in Python and its ecosystem for web services and data processing
  • Strong experience with Infrastructure as Code (Terraform), a major cloud platform (e.g., GCP, AWS, Azure), and deploying containerized applications
  • A passion for shaping 0→1 products in a lean, fast-paced R&D environment where you'll help define new playbooks for AI-native experiences
Job Responsibility
Job Responsibility
  • Build and Scale AI Services: Design, build, and maintain scalable backend services and APIs for AI-powered features, writing primary production code in Python
  • Architect Multi-Agent Systems: Move beyond standard RAG to design and implement complex, hierarchical Multi-Agent Systems that can perform sophisticated, multi-step tasks
  • Implement Evaluation and Fine-Tuning: Build robust frameworks to evaluate the quality of AI systems and manage fine-tuning pipelines to continuously improve model performance
  • Own Cloud Infrastructure with IaC: Define, deploy, and manage our AI infrastructure using Terraform. You'll be responsible for scaling our container-based serverless solutions while ensuring reliability and performance
  • Optimize for Efficiency: Deeply analyze the tradeoffs between model performance, latency, and cost to make pragmatic, business-aware technical decisions when using managed AI services
  • Integrate Across the Stack: Collaborate with our core engineering teams by occasionally working in TypeScript (Node.js) to integrate AI features into our main application
What we offer
What we offer
  • Health,Dental and Vision Insurance
  • Equinox Membership
  • Unlimited PTO
  • Team Events, Dinners, & Offsites, Free Event Tickets to Dope Shows
  • New MacBook
  • Daily Uber Eats Credit
  • Relocation bonuses are available for some out-of-state candidates
  • Offers Equity
  • Fulltime
Read More
Arrow Right

Senior Software Development Engineer (Backend) - Evisort AI

Join the Workday AI organization, where you'll be building and supporting state-...
Location
Location
Canada , Vancouver; Toronto
Salary
Salary:
140000.00 - 210000.00 CAD / Year
Workday
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 8+ years of experience in software engineering
  • 5+ years experience with a web development framework (Python/Typescript preferred: Flask, NestJS, Express, Django, or FastAPI)
  • Experience in ownership of designing, building and operating of SaaS products in cloud environments (AWS preferred)
  • Experience with a Relational DB (PostgreSQL preferred)
  • Familiarity with LLMs and Agent development
  • Familiarity with the tradeoffs and architecture of modern distributed systems and event-driven architectures
  • Knowledge of software development best practices (DevOps, CI/CD, automated testing, observability)
  • Hands-on experience with containerization technologies (Docker, Kubernetes)
  • Familiarity with Elasticsearch or other document stores
  • Experience with observability tools like Sentry and Grafana, building and monitoring dashboards
Job Responsibility
Job Responsibility
  • Collaborate with engineering, data science, product, and design teams to build and evolve our vision, strategy, and roadmap
  • Participate in a supportive, iterative team culture that values curiosity, learning, and strong engineering practices
  • Contribute to the growth and success of your teammates through knowledge sharing and mentorship
  • Take ownership of multiple functional areas in our platform — from development to production (“you build it, you run it”)
  • API Development: Design and build high-performance back-end services using Python to facilitate communication between microservices
  • Actively monitor and optimize code to ensure platform performance
  • Implement comprehensive monitoring, alerting, and logging strategies to ensure the health and performance of all integrations and back-end services
What we offer
What we offer
  • May be eligible for the Workday Bonus Plan or a role-specific commission/bonus
  • Annual refresh stock grants
  • Comprehensive benefits (refer to Workday benefits link)
  • Fulltime
Read More
Arrow Right

Senior Backend Engineer (AI Applications)

Plaud is building the world's most trusted AI work companion for professionals t...
Location
Location
Singapore , Singapore
Salary
Salary:
Not provided
plaud.ai Logo
Plaud
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Minimum 3 years of software engineering experience in AI, backend systems, or related fields
  • Strong programming fundamentals in languages such as Python, Go, or similar
  • Practical understanding of LLM applications and integrating model-based workflows into products
  • Ability to design, implement, and maintain large-scale, production-grade systems
Job Responsibility
Job Responsibility
  • Design and build AI Agent application systems that power intelligent user experiences
  • Develop and optimize retrieval systems that integrate deeply with Agent reasoning and workflows
  • Collaborate with product and cross-functional teams to deliver end-to-end AI application features
  • Continuously iterate on Agent capabilities, improving reliability, adaptability, and performance
  • Explore and prototype new forms of AI intelligence to push the boundaries of product experience
What we offer
What we offer
  • Define the next-gen paradigm for human-AI interaction
  • Gain exposure to cutting-edge AI for Pro tools and play a direct role in our global expansion
  • Work with passionate teammates who value innovation, collaboration, and customer success
  • Grow your career in a culture that champions continuous learning and fast career development
  • Market-competitive compensation, global exposure, and a vibrant, creativity-fueled work atmosphere
  • Fulltime
Read More
Arrow Right

Senior AI Software Engineer

We’re looking for a Senior AI Software Engineer to help build and scale producti...
Location
Location
Poland , Warszawa
Salary
Salary:
Not provided
devire.pl Logo
Devire
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of experience in software engineering, AI engineering, or ML engineering
  • Strong Python skills and experience building production-grade APIs and backend systems
  • Hands-on experience with LLMs, embeddings, and agent-based architectures
  • Experience with cloud platforms (AWS and/or Azure) and modern deployment patterns
  • Solid understanding of CI/CD, testing, and infrastructure as code
  • Experience with monitoring, logging, and system reliability in production environments
  • Good understanding of performance, scalability, and cost trade-offs in AI systems
  • Strong problem-solving skills and ability to work in a cross-functional environment
  • Fluent English
Job Responsibility
Job Responsibility
  • Take AI use cases from prototype to fully productionized solutions, ensuring reliability, scalability, and security
  • Design and build cloud-native APIs and microservices for AI applications using Python (e.g. FastAPI, gRPC)
  • Develop and maintain agent-based systems, including tool integrations and orchestration workflows
  • Build and optimize RAG pipelines and/or text-to-SQL solutions, focusing on performance, cost efficiency, and accuracy
  • Implement CI/CD pipelines and automated testing for AI services
  • Deploy and manage applications in AWS and/or Azure using modern cloud architecture patterns (containers, serverless, etc.)
  • Ensure full observability of AI systems (logging, tracing, monitoring, cost tracking)
  • Introduce and maintain evaluation frameworks, guardrails, and quality controls for AI outputs
  • Collaborate closely with Data, ML, Product, and Engineering teams to deliver robust, end-to-end solutions
  • Contribute to architecture decisions, best practices, and engineering standards across the team
Read More
Arrow Right

Senior Software Engineer, AI Platform

GoodLeap is a technology company delivering best-in-class financing and software...
Location
Location
United States , AUSTIN; SAN FRANCISCO; IRVINE; ROSEVILLE
Salary
Salary:
173000.00 - 200000.00 USD / Year
goodleap.com Logo
GoodLeap
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of experience building and shipping scalable, robust backend services and APIs
  • Strong proficiency in Python and/or TypeScript
  • Solid understanding of distributed systems, service-oriented architecture, and event-driven patterns (e.g. Kafka, RabbitMQ, SQS)
  • Passion for software development, emerging technologies and culture of innovation
  • A collaborative mindset and interest in mentoring teammates and elevating team practices
  • Excellent communication and interpersonal skills
Job Responsibility
Job Responsibility
  • Build features and extensions to our agentic AI platform using scalable, robust, and AI-first software engineering practices
  • Design tools and infrastructure to enable teams at GoodLeap to easily build and enhance AI agents that empower homeowners, contractors, and operations staff
  • Work alongside a team of AI engineers, product managers, and data scientists to evaluate and improve our agent ecosystem
  • Collaborate with Staff engineers, product, architecture, and design leads to deliver highly-available, fault-tolerant products and services
  • Work on significant and unique technical challenges, evaluate and recommend solutions, and guide decision making by considering technical tradeoffs
  • Grasp both the technical and business perspective so you can help drive innovation
  • Work autonomously and be self-disciplined, requiring minimal supervision or guidance
  • Collaborate with other team members and coach more junior team members to grow both their technical skills and soft skills
What we offer
What we offer
  • May be eligible for a bonus and equity
  • Fulltime
Read More
Arrow Right

Senior Software Engineer, Backend

Location
Location
United States , Philadelphia
Salary
Salary:
Not provided
https://www.roberthalf.com Logo
Robert Half
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of professional software engineering experience
  • Strong proficiency in Python 3.10+, writing idiomatic, well‑structured code
  • Deep experience with FastAPI or similar async web frameworks
  • Solid understanding of relational databases (PostgreSQL preferred), ORM patterns, and schema migration tools
  • Experience working with large‑scale datasets and maintaining strong data integrity
  • Working knowledge of concurrency, distributed execution, and async processing models
  • Hands‑on experience with AWS services, containerization, and CI/CD pipelines
  • Strong communication skills and experience working in Agile environments
Job Responsibility
Job Responsibility
  • Design, build, and maintain backend services and data pipelines that ingest, normalize, and analyze large volumes of cloud and security data
  • Write production‑quality Python code using established architectural patterns, testing practices, and documentation standards
  • Design and own medium‑complexity systems, including data models, API contracts, orchestration logic, and integrations
  • Leverage AI coding agents daily to accelerate development while maintaining code quality and architectural consistency
  • Craft structured prompts aligned with project conventions and critically evaluate AI‑generated output for correctness, security, and maintainability
  • Apply judgment to determine when to hand‑code versus delegate tasks to AI agents
  • Build and maintain services running on AWS, including containerized workloads and supporting cloud services
  • Implement resilient, long‑running processes with robust retry logic, progress tracking, and failure handling
  • Contribute to Infrastructure as Code and CI/CD pipelines supporting multi‑environment deployments and security scanning
  • Conduct thorough code reviews evaluating design intent, correctness, security, and long‑term sustainability
What we offer
What we offer
  • Access to top jobs, competitive compensation and benefits, and free online training
  • Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance
  • Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan
Read More
Arrow Right

Agentic AI - Senior Software Engineer

Mastercard Foundry R&D is seeking a Senior Software Engineer to join the Agentic...
Location
Location
Ireland , Dublin 18
Salary
Salary:
Not provided
mastercard.com Logo
Mastercard
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Hands-on experience building applications or systems using Generative AI, LLMs, or agentic patterns
  • Experience with one or more modern AI frameworks and SDKs for agent orchestration, AI application development, or coding-agent workflows (for example LangGraph, OpenAI Agents SDK, Vercel AI SDK, or Codex SDK)
  • Strong understanding of orchestration, tool-calling, context management, and AI system design trade-offs
  • Strong software engineering experience building scalable, maintainable production systems
  • Experience with React and/or Next.js
  • Strong backend engineering skills in Java and/or Python
  • Experience with developer tooling, automation, CLI-based workflows, and CI/CD
  • Familiarity with containers, cloud-native development, and service integration patterns
  • Experience building products, prototypes, and/or internal platforms with a focus on usability and adoption
Job Responsibility
Job Responsibility
  • Build software, tooling, and platform capabilities that support Mastercard’s Agentic AI strategy
  • Design and implement AI-enabled applications, workflows, and developer-facing capabilities
  • Develop reusable services, patterns, and integrations for AI and agentic systems
  • Evaluate models, frameworks, and tools across quality, cost, latency, reliability, and maintainability
  • Contribute to new product and prototype development from concept through validation
  • Improve developer experience through automation, AI-assisted workflows, and platform thinking
  • Partner with product, engineering, and business stakeholders to turn ideas into working solutions
  • Advocate learnings, prototypes, and best practices across the organization
  • Fulltime
Read More
Arrow Right

Senior Software Engineer- AI

Are you looking for an opportunity to work with the latest Azure offerings and p...
Location
Location
India , Bangalore
Salary
Salary:
Not provided
https://www.microsoft.com/ Logo
Microsoft Corporation
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 7+ years of experience in Software Development
  • Strong programming expertise in one or more languages such as Python, Go, Java, or C#, with experience designing production-grade services and APIs
  • Experience building AI-powered applications, including integrating LLMs, implementing agent or Copilot workflows, and orchestrating multi-step AI interactions
  • Hands-on experience with LLM application frameworks and orchestration tools such as Semantic Kernel, LangChain, or similar agent frameworks
  • Familiarity with retrieval-augmented generation (RAG) architectures, vector databases, embeddings, and semantic search systems
  • Experience evaluating and improving model performance through prompt design, evaluation frameworks, fine-tuning, or feedback loops
  • Solid understanding of distributed systems concepts including scalability, reliability, observability, caching, and asynchronous processing
  • Experience deploying and operating AI workloads in cloud environments (preferably Azure), including containerized services and GPU-enabled infrastructure
  • Understanding of Responsible AI practices, including model governance, safety, privacy, and evaluation of AI behaviour in production systems
  • Ability to work across product, research, and engineering teams to translate product scenarios into scalable AI system architectures
Job Responsibility
Job Responsibility
  • Design, build, and operate scalable AI systems that power intelligent product experiences, including Copilot and agent-driven workflows
  • Architect and implement backend services that support multi-step AI interactions, including orchestration pipelines, context management, memory/state persistence, and tool execution
  • Integrate large language models (LLMs), APIs, and internal services to enable context-aware, human-in-the-loop experiences across customer scenarios
  • Build and maintain data and inference pipelines that support model training, fine-tuning, evaluation, and real-time inference across diverse data sources
  • Evaluate, benchmark, and tune AI/ML models (LLMs and traditional models) to meet product requirements for accuracy, latency, reliability, and safety
  • Implement robust retrieval, grounding, and knowledge integration mechanisms (e.g., RAG systems, semantic indexing, vector search) to power intelligent applications
  • Collaborate with product managers, software engineers, and researchers to translate product vision into production-ready AI capabilities and measurable outcomes
  • Ensure reliability, observability, and governance of AI systems, including monitoring model performance, data quality, and responsible AI practices
  • Build reusable platforms, APIs, and tools that enable teams to rapidly develop AI-powered features and self-service intelligent applications
  • Fulltime
Read More
Arrow Right