Senior / Principal Software Development Engineer

We are seeking a highly experienced Senior / Principal Software Development Engineer to support a large-scale Healthcare Communication Training Platform built on a modern MERN-stack architecture hosted within AWS. This is a hands-on engineering and technical leadership role focused on platform stabilization, architectural improvement, feature development, and long-term scalability. The ideal candidate brings deep expertise across full-stack JavaScript development, cloud-native AWS environments, and modern application architecture, while also being comfortable operating within complex, fast-moving client environments.

This individual will work closely with technical leadership, project management, QA, DevOps, and business stakeholders to drive both ongoing maintenance efforts and new platform enhancements. This engagement includes ownership across two major phases:
Platform stabilization, code audits, defect remediation, and architectural assessment

New module development, workflow enhancements, reporting functionality, and platform modernization

The role requires a strong balance of hands-on coding ability, technical strategy, problem-solving, and cross-functional collaboration.
Engagement Details
Fully Remote

Contract / Consulting Engagement

Healthcare & Learning Technology Environment

Immediate Interview Availability Preferred

Role Overview
This role combines deep hands-on engineering with technical leadership responsibilities across a cloud-hosted healthcare learning platform deployed on AWS ECS Fargate using ReactJS, Node.js, MongoDB Atlas, and supporting AWS services.
The position will support two key initiatives:
Phase 1 – Platform Stabilization & Technical Assessment
Conduct architecture and codebase audits

Resolve critical defects and platform instability

Improve environment parity across staging and production

Support vendor transition and onboarding activities

Improve testing, CI/CD reliability, and operational scalability

Phase 2 – New Feature & Module Development
Lead end-to-end development of new platform modules

Extend user management workflows and reporting functionality

Improve accessibility compliance across the application

Drive scalable engineering standards and best practices

Key Responsibilities
Design, develop, test, and deploy scalable full-stack application features and enhancements

Conduct detailed audits of existing systems and provide actionable remediation recommendations

Lead development of new application modules from architecture through deployment

Diagnose and resolve complex platform defects, performance bottlenecks, and deployment issues

Maintain and extend AWS-based infrastructure and services including Cognito, Lambda, SQS, DynamoDB, ECS, and related workflows

Design and maintain RESTful APIs and backend services using Node.js and Express.js

Build and maintain accessible, responsive UI components aligned with WCAG 2.1 AA standards

Write and maintain unit, integration, and E2E tests using Playwright, Jest, or Mocha

Participate in sprint planning, backlog grooming, architecture discussions, and code reviews

Create and maintain technical documentation, architecture diagrams, and environment configuration documentation

Collaborate cross-functionally with Product, QA, DevOps, PMs, and stakeholders

Identify technical risks and proactively propose mitigation strategies

Mentor and support junior and mid-level engineers

Support technical onboarding, vendor transition, and platform modernization initiatives

Contribute to technical strategy, architecture evolution, and engineering best practices

Required Qualifications
10+ years of software development experience (15+ years preferred for Principal-level candidates)

Strong experience building and maintaining production-grade MERN stack applications

Expert-level proficiency in:
ReactJS

Next.js

TypeScript

Node.js

Express.js

MongoDB Atlas & Mongoose ODM

Hands-on experience with AWS cloud services and distributed systems

Experience with CI/CD pipelines using Bitbucket Pipelines, GitHub Actions, GitLab CI, or similar

Experience designing scalable cloud-based architectures and troubleshooting production issues

Strong understanding of WCAG 2.1 AA accessibility implementation in React applications

Experience working in Agile/Scrum development environments

Proven ability to independently own major platform components and deliver on schedule

Strong written and verbal communication skills

Preferred Qualifications
Experience working within EdTech, Healthcare, LMS, or training platform environments

Familiarity with SCORM and xAPI standards

Experience with vendor-transition or platform onboarding engagements

Experience with AWS ECS/Fargate container deployments

Familiarity with:
AWS Cognito

Lambda

SQS

DynamoDB

AWS CDK

SendGrid API

Experience supporting multi-environment AWS deployments and environment parity remediation

Prior technical leadership or mentoring experience strongly preferred

Skills & Competencies
Advanced full-stack debugging and problem-solving capability

Strong software architecture and system design skills

Ability to work effectively within legacy codebases and define modernization strategies

Strong technical leadership and mentoring skills

Excellent prioritization and time management

Quality-focused engineering mindset

Ability to communicate technical concepts clearly to both technical and non-technical stakeholders

Ability to thrive in fast-paced, evolving project environments

Core Technology Stack
Frontend
ReactJS

Next.js

TypeScript

HTML5 / CSS3

WCAG 2.1 Accessibility Standards

Backend
Node.js

Express.js

RESTful APIs

Database
MongoDB Atlas

Mongoose ODM

AWS / Cloud
ECS Fargate

Lambda

Cognito

SQS

DynamoDB

AWS CDK

Testing & DevOps
Playwright

Jest / Mocha

Bitbucket Pipelines

CI/CD workflows

Containerized deployments