Software Developer – API

United States Digital Space LLC; Toronto; On-site; CAD 90,000 - 120,000; Full time

Job summary

United States Digital Space LLC in Toronto, Canada, seeks a senior software engineer to translate complex system specifications into working, tested applications. You will design, develop, and maintain web and API services using React, Node.js, and Next.js, with a focus on RESTful APIs and scalable architecture.

The role requires hands-on coding, collaboration across teams, and experience with cloud platforms, Agile methodologies, and modern DevOps practices to deliver robust, data-driven

Qualifications

• 5+ years experience with React framework and TypeScript.
• 5+ years with Node.js and Next.js.
• 5+ years building and testing RESTful APIs.
• 2-3+ years of Multi-agent AI, LLMops, MCP, langchain, langGraph, RAG, Qdrant, Python.
• Experience with ML models – XGBoost, TensorFlow.
• Experience with Airflow, PySpark.
• 5+ Hands on experience with Progressive Web Apps.
• Experience in HTML, JavaScript, CSS and CSS Frameworks.
• Experience with Azure cloud platforms.

Responsibilities

• Translating technical systems specifications into working, tested applications.
• Developing detailed programming specifications.
• Writing and/or generating code.
• Compiling data-driven programs, maintaining, and conducting unit tests.
• Analyzes, designs, develops, codes and implements programs in one or more programming languages, for Web and Rich Internet Applications.
• Supports applications with an understanding of system integration, test planning, scripting, and troubleshooting.
• Designs and develops REST API platform (e.g., with using Apigee/APIM).
• Converts web services from SOAP to REST or vice-versa.
• Resolves and troubleshoots technical problems which arise during the use and operation of software packages, including technical assistance in implementation, conversion and migration.

Skills

React

Node.js

Next.js

REST APIs

TypeScript

JavaScript

HTML/CSS

JSON/Swagger

Agile/Scrum

Cloud platforms

Tools

Apigee

Swagger / OpenAPI

JWT/OAuth2

Airflow

PySpark

Job description

Description Responsibilities

• Required to translate technical systems specifications into working, tested This includes:
• Developing detailed programming specifications
• Writing and/or generating code
• Compiling data-driven programs, maintaining, and conducting unit
• Analyzes, designs, develops, codes and implements programs in one or more programming languages, for Web and Rich Internet Applications
• Supports applications with an understanding of system integration, test planning, scripting, and troubleshooting
• Designs and develops REST API platform (e.g., with using Apigee/APIM)
• Converts web services from SOAP to REST or vice-versa
• Resolves and troubleshoots technical problems which arise during the use and operation of software packages, including technical assistance in implementation, conversion and migration.

General Skills

• Experience in programming and analysis; specialized software package support at the specified experience level
• Ability to collaborate with IT Professionals throughout the Software Development Life Cycle
• Experience in structured methodologies for the development, design, implementation and maintenance of applications
• Experience in design, code, test, debug and document applications
• Experience in the use of object and/or third generation language development tools
• Experience in one or more programming languages
• Experience in application design, latest design patters, deployment and troubleshooting
• Experience with relational and hierarchical database technologies
• Experience in the use of information retrieval packages using query languages
• Experience with one or more communications protocols
• Experience in structured methodologies for the design, development, implementation and maintenance of applications
• Experience eliciting and documenting information from diverse business area stakeholders and subject matter experts
• Excellent analytical, problem-solving and decision-making skills; verbal and written communication skills; interpersonal and negotiation skills
• A team player with a track record for meeting deadlines

API Skills

• Experience with Web Technologies (DHTML, AJAX, etc.)
• Experience with Security frameworks (e.g., JWT, OATH2)
• Experience in API layer like security, custom analytics, throttling, caching, logging, monetization, request and response modifications etc. using Apigee
• Experience in creating REST API documentation using Swagger and YAML or similar tools desirable
• Experience with Integration frameworks (e.g., Mule, Camel) desirable

Desirable Skills

• Knowledge and experience with programming Internet-ready applications
• Knowledge and experience in rapid application development (RAD) methodologies
• Knowledge and understanding of Information Management principles, concepts, policies and practices
• Experience with middleware and gateways
• Experience reviewing, analyzing, and modifying product installation scripts including encoding, testing, debugging
• Ability to provide post-implementation support and resolve any post-implementation technical issues
• Experience conducting design walkthrough sessions with project team
• Knowledge and understanding of Accessibility for Ontarians with Disability Act (AODA) and related regulations and standards
• Ability to provide user and system documentation as required

Experience Requirements

Technical Skills 40%

• Experience with Agile methodologies
• Experience with React framework and typescript
• Experience with Node.js and Next.js
• Experience with building and testing RESTful APIs
• Multi-agent (Agentic AI), LLMops, MCP, langchain, langGraph, RAG, Qdrant, Python
• ML models – XGboost, Tensorflow
• MLops – Mlflow, DVC
• Airflow, PySpark
• Working knowledge of Jamstack Architecture
• Hands on experience with Progressive Web Apps
• Hands on experience with responsive design, front-end testing and debugging techniques, page load optimization and version control
• Experience and expert knowledge in HTML, JavaScript, CSS and CSS Frameworks
• Working knowledge of DevOps, task boards, pipelines, etc.
• Experience with headless content management systems
• Experience creating front end functionality for login page, profile creation, customer notifications and self-service sign-up
• Required to translate technical systems specifications into working, tested applications. This includes:

• Developing detailed programming specifications
• Writing and/or generating code
• Compiling data-driven programs, maintaining, and conducting unit tests

• Resolves and troubleshoots technical problems which arise during the use and operation of software packages, including technical assistance in implementation, conversion and migration.

Experience 40%

• Experience with cloud platforms such as Azure
• Experience with Agile methodologies including using kanban/task boards
• Extensive experience with JavaScript, CSS, HTML, and front-end languages, user interface design.
• Experience with RESTful APIs.
• Hands on experience developing production level AI agents, frameworks and AI supported systems using various models, tools and architectures (e.g. LLMs, ML, Computervision, etc.)
• Hands on experience designing and implementing MLOps tools and processes in enterprise environments
• Experience in programming and analysis; specialized software package support at the specified experience level
• Ability to collaborate with IT Professionals throughout the Software Development Life Cycle
• Experience in structured methodologies such as Agile Scrum for the development, design, implementation, and maintenance of applications
• Experience in design, code, test, debug and document applications
• Experience in application design, latest design patterns, deployment, and troubleshooting
• Experience with one or more communications protocols
• Experience eliciting and documenting information from diverse business area stakeholders and subject matter experts
• Excellent analytical, problem-solving, and decision-making skills; verbal and written communication skills; interpersonal and negotiation skills
• A team player with a track record for meeting deadlines
• Hands on experience building integrations to IAA systems such as Azure AD B2C Authentication, Okta Authentication

Communication Skills 20%

• Strong communication skills to prepare documentation, including but not limited to: solution documentation, user manuals, reports, reviews, assessments
• Ability to present ideas and suggestions clearly and effectively and in a user-friendly manner; maintain a high level of customer service to both internal and external clients
• Ability to communicate designs and development in clear and understandable manner

Supplier Comments

Closing Date/Time: 2026-08-24, 12:00 p.m. EST

Max submission: 1 (one)

5 days onsite

Must Have:

• 5+ Experience with React framework and typescript
• 5+ Experience with Node.js and Next.js
• 5+ Experience building and testing RESTful APIs
• 2-3+ years of Multi-agent (Agentic AI), LLMops, MCP, langchain, langGraph, RAG, Qdrant, Python
• Experience with ML models – XGboost, Tensorflow
• Experience with Airflow, PySpark
• 5+ Hands on experience with Progressive Web Apps
• Experience and expert knowledge in HTML, JavaScript, CSS and CSS Frameworks
• Experience with cloud platforms such as Azure

Nice to have:

• Hands on experience developing production level AI agents, frameworks and AI supported systems using various models, tools and architectures (e.g. LLMs, ML, Computervision, etc.)
• Hands on experience designing and implementing MLOps tools and processes in enterprise environments
• Prior OPS exp or public sector exp.