99x

Senior Full Stack Engineer (SSE /ATL) - Enterprise & AI Focus

99x  •  Colombo, LK (Onsite)  •  10 days ago
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Job Description

We are seeking an experienced Senior Full Stack Engineer (SSE / ATL) to design, build, and scale enterprise-grade applications with a strong focus on modern web technologies and AI-driven solutions.

Key Responsibilities

  • Develop and maintain scalable full-stack applications with complex business logic and high security standards
  • Design and implement modern frontend solutions using React/Next.js with TypeScript
  • Build robust backend services using Node.js and Express.js
  • Develop and integrate Agentic AI solutions, including autonomous agents and multi-step workflows
  • Architect modular, decoupled systems with seamless frontend-backend integration
  • Design and optimize databases (PostgreSQL, MongoDB)
  • Ensure code quality through unit and end-to-end (E2E) testing
  • Collaborate on system architecture, technical strategy, and solution design

Required Skills & Experience

  • Proven experience in enterprise-level full-stack development
  • 3+ years of experience in React/Next.js, TypeScript, and Node.js
  • Hands-on experience with Agentic AI development
  • Solid understanding of software architecture and design principles
  • Experience with REST API design, security, and documentation
  • Proficiency in AWS services (EC2, S3, Lambda, RDS)
  • Familiarity with DevOps practices (CI/CD, Docker, cloud deployments)
  • Strong problem-solving and communication skills

Nice to Have

  • Experience with LLMs and AI system integration
  • Knowledge of NestJS, Python, and FastAPI
  • Background in .NET or Java (enterprise environments)
  • Exposure to Manufacturing or Supply Chain domains

What We're Looking For

  • Self-driven, proactive problem solver
  • Ability to rapidly prototype and validate ideas
  • Strong presentation and stakeholder communication skills
  • Passion for innovation and staying current with emerging technologies
99x

About 99x

We empower our customers to create exceptional product experiences, to rapidly scale their own teams with top-tier local and nearshore engineering talent, and to build appealing web solutions and business critical systems. Our offices are based in Norway, Sri Lanka, Malaysia, Brazil, and Portugal, with over 600 employees worldwide. The 99x Group serves clients in Norway, Sweden, Germany, across Europe and North America. What sets us apart is our combination of local presence, global access to talent and proven capability of delivering value with multi-national teams.

Industry
IT & Software
Company Size
501-1,000 employees
Headquarters
Oslo, NO
Year Founded
Unknown
Website
99x.io
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