Senior MERN Stack Developer

SpaceLizit; United States; Remote; USD 150,000 - 210,000; Full time

Benefits offered by this job

Fully remote work

Competitive compensation

Flexible engagement (part-time or full

Job summary

SpaceLizit is seeking an experienced Senior MERN Stack Developer to lead the architecture and development of our core AI-powered platform. You will mentor junior engineers, drive technical decisions, and ensure delivery of high-quality, scalable software that serves hundreds of immigration law firms across the United States.

SpaceLizit automates USCIS immigration workflows for US law firms using AI. Our platform handles H-1B, green card, and visa petition automation, RFE prevention, and

Qualifications

• 5–10 years of professional full-stack development experience.
• Expert-level proficiency in React.js, Next.js, Node.js, and TypeScript.
• Deep experience with MongoDB including complex aggregations and performance tuning.
• Strong GraphQL API design and implementation skills.
• Proven experience with NestJS or similar enterprise Node.js frameworks.
• Experience with microservices architecture and distributed systems.
• Proficiency with CI/CD pipelines (GitHub Actions, AWS CodePipeline, or similar).
• Strong knowledge of AWS or GCP cloud services.

Responsibilities

• Architect scalable, maintainable full-stack applications with the MERN stack.
• Lead technical design discussions and contribute to architectural decisions.
• Set coding standards and conduct thorough code reviews.
• Mentor junior and mid-level developers with structured guidance.
• Design and implement complex UI features using React.js, Next.js 14+, and TypeScript.

Skills

React.js

Next.js

Node.js

TypeScript

MongoDB

GraphQL

NestJS

AWS

Job description

SpaceLizit is seeking an experienced Senior MERN Stack Developer to lead the architecture and development of our core AI-powered platform. You will mentor junior engineers, drive technical decisions, and ensure delivery of high-quality, scalable software that serves hundreds of immigration law firms across the United States.

SpaceLizit automates USCIS immigration workflows for US law firms using AI. Our platform handles H-1B, green card, and visa petition automation, RFE prevention, and intelligent case management.

Key Responsibilities

Technical Leadership

• Architect scalable, maintainable full-stack applications with the MERN stack
• Lead technical design discussions and contribute to architectural decisions
• Set coding standards and conduct thorough code reviews
• Mentor junior and mid-level developers with structured guidance

Full-Stack Engineering

• Design and implement complex UI features using React.js, Next.js 14+, and TypeScript
• Build robust GraphQL and REST APIs with NestJS and Node.js
• Optimise MongoDB queries, design aggregation pipelines, and manage indexing
• Integrate third-party services, AI APIs, and USCIS data systems

Performance & Quality

• Identify and resolve performance bottlenecks across the stack
• Implement end-to-end test coverage with Jest, Cypress, and Playwright
• Lead incident response, root-cause analysis, and system reliability improvements
• Define and monitor SLOs/SLAs for critical services

Agile & Delivery

• Collaborate closely with product managers, designers, and QA in two-week sprints
• Break down complex features into actionable engineering tasks
• Drive continuous improvement through retrospectives and process refinements

Requirements

• 5–10 years of professional full-stack development experience
• Expert-level proficiency in React.js, Next.js, Node.js, and TypeScript
• Deep experience with MongoDB including complex aggregations and performance tuning
• Strong GraphQL API design and implementation skills
• Proven experience with NestJS or similar enterprise Node.js frameworks
• Experience with microservices architecture and distributed systems
• Proficiency with CI/CD pipelines (GitHub Actions, AWS CodePipeline, or similar)
• Strong knowledge of AWS or GCP cloud services

Preferred Qualifications

• Experience building AI-integrated applications (OpenAI, LangChain, vector databases)
• Knowledge of Redis for caching and session management
• Familiarity with WebSocket / real-time systems
• Experience with legal-tech, immigration-tech, or SaaS B2B products
• Open-source contributions or published npm packages

Soft Skills

• Exceptional communication and leadership skills
• Ability to mentor and inspire junior engineers
• Strategic thinking with a focus on long-term technical health
• Strong ownership mindset — you ship features and own outcomes
• Cross-functional collaboration with non-technical stakeholders

What We Offer

Fully remote — work from anywhere in the world

Highly competitive compensation package

Flexible part-time or full-time engagement

Senior leadership visibility and fast career progression

Direct impact on a product used by US immigration attorneys

Access to latest AI tools and annual learning budget

Equity participation (for full-time senior hires)

Generous PTO and mental health days

Application Questions

1. Describe the most technically challenging system you have architected. What were the scale requirements and how did you solve them?
2. How do you approach mentoring junior engineers? Give a specific example.
3. What is your availability — full-time, part-time, or open to both?

License / Certification

AWS Certified Developer or Solutions Architect (preferred, not mandatory)

MongoDB Professional Certification (preferred, not mandatory)