Senior Full Stack Software Developer

Modern.tech; Colombia; Remote; COP 180,000,000 - 260,000,000; Full time

Benefits offered by this job

Flexible hours

Remote work options

Professional development

Job summary

Modern.tech is seeking a highly skilled Senior Full-Stack Developer to design and build cross-platform web and mobile applications. The role requires expertise in Next.js (React), ASP.NET Core, Entity Framework, MongoDB, and cloud services (AWS, Vercel), plus hands-on experience with AI coding tools to prototype and iterate rapidly.

You will mentor peers, plan development sprints, and collaborate with product stakeholders to translate requirements into scalable technical solutions across SQL and

Qualifications

• Bachelor's degree or equivalent experience required.
• Proven experience as a full-stack developer building web/mobile systems.
• Strong backend experience with Node.js and C#/.NET and RESTful APIs.
• Experience with ORMs, e.g., Entity Framework.
• Cloud experience with AWS, MongoDB Atlas App Services, and Next.js on Vercel.
• Familiarity with Git and CI/CD; Docker a plus.
• Experience with automated testing (unit/integration/E2E).
• Experience with AI coding tools (Anthropic, OpenAI).
• Excellent problem-solving and communication skills.
• Fluent English, both written and verbal.

Responsibilities

• Design and develop robust, scalable full-stack solutions for web and mobile applications.
• Interface with product stakeholders and clients to gather requirements and translate them into technical specifications and prototypes.
• Contribute to development planning — breaking work into epics and tasks and helping organize sprints within a multi-developer team.
• Mentor other developers, review their code, and collaborate on planning and technical decisions.
• Build efficient, secure server-side architectures on serverless cloud platforms such as AWS Lambda, Vercel, and Atlas App Services.
• Optimize database performance through effective data modeling and querying across both SQL and NoSQL systems.
• Deploy and manage applications on AWS infrastructure, leveraging services such as Lambda, S3, Secrets Manager, VPC Peering, EventBridge, and EC2.
• Stay current with emerging technologies and industry trends, sharing knowledge and insights with the team.

Skills

Full-stack development

Next.js/React

ASP.NET Core

Node.js

C#/.NET

Entity Framework

MongoDB

AWS

Vercel

RESTful APIs

CI/CD

Docker

Testing

AI tooling

English

Education

Bachelor's degree in Computer Science, Software Engineering, or related field

Tools

Git

Docker

CI/CD pipelines

Vercel

Job description

We are seeking a highly skilled and experienced Senior Full-Stack Developer with expertise across Next.js (React), ASP.NET Core, Entity Framework, MongoDB, Vercel, and AWS, along with hands-on experience using AI coding tools such as Claude Code or Codex to design and build products and prototypes. This is an exciting opportunity to join a dynamic team and help build cutting-edge applications across a range of industries.

Responsibilities

• Design and develop robust, scalable full-stack solutions for web and mobile applications.
• Interface with product stakeholders and clients to gather requirements and translate them into technical specifications and prototypes.
• Contribute to development planning — breaking work into epics and tasks and helping organize sprints within a multi-developer team.
• Mentor other developers, review their code, and collaborate on planning and technical decisions.
• Build efficient, secure server-side architectures on serverless cloud platforms such as AWS Lambda, Vercel, and Atlas App Services.
• Optimize database performance through effective data modeling and querying across both SQL and NoSQL systems.
• Deploy and manage applications on AWS infrastructure, leveraging services such as Lambda, S3, Secrets Manager, VPC Peering, EventBridge, and EC2.
• Stay current with emerging technologies and industry trends, sharing knowledge and insights with the team.

Requirements

• Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent experience).
• Proven experience as a full-stack software developer implementing complex web and mobile systems, including collaborating with and mentoring other team members.
• Solid back-end experience with Node.js and C# / .NET (ASP.NET Core), including building RESTful APIs and serverless functions.
• Experience with ORMs and data access, including Entity Framework.
• Hands-on experience with cloud services, specifically AWS, MongoDB Atlas App Services, and Next.js on Vercel.
• Experience with Git and version control workflows; familiarity with CI/CD pipelines and containerization (e.g., Docker) is a plus.
• Familiarity with automated testing practices (unit, integration, and end-to-end).
• Experience using Anthropic and OpenAI models to build product prototypes, workflows, and internal tooling.
• Excellent problem-solving skills, with the ability to troubleshoot and debug complex, unfamiliar systems.
• Strong communication and teamwork skills for collaborating effectively across cross-functional teams.
• Fluent English, both written and verbal.
• Competitive salary and comprehensive benefits package.
• The opportunity to work on cutting-edge projects and help shape the future of web and mobile applications.
• A collaborative, inclusive work environment that values creativity and innovation.
• Professional development and growth opportunities.
• Flexible hours and remote work options.