Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I'm Sunnan Haider, a passionate Full Stack Developer and Co-Founder of CalliumCode, based in Islamabad, Pakistan. I specialize in building dynamic, scalable web and mobile applications using modern technologies like Next.js, React.js, Vue.js, and Flutter. I enjoy collaborating with international clients and driving growth by delivering custom software solutions tailored to diverse needs. With hands-on experience in backend development, cloud infrastructure, and deployment strategies, I stay committed to continuous learning and applying best practices for software design and project management. I also have experience working remotely, which has honed my communication and cross-cultural collaboration skills, making me a valuable team player in fast-paced environments.…Hi, I'm Sunnan Haider, a passionate Full Stack Developer and Co-Founder of CalliumCode, based in Islamabad, Pakistan. I specialize in building dynamic, scalable web and mobile applications using modern technologies like Next.js, React.js, Vue.js, and Flutter. I enjoy collaborating with international clients and driving growth by delivering custom software solutions tailored to diverse needs. With hands-on experience in backend development, cloud infrastructure, and deployment strategies, I stay committed to continuous learning and applying best practices for software design and project management. I also have experience working remotely, which has honed my communication and cross-cultural collaboration skills, making me a valuable team player in fast-paced environments.

Sunnan Haider

Full Stack Developer, Web Developer, App Developer, +2





Hi, I'm Sunnan Haider, a passionate Full Stack Developer and Co-Founder of CalliumCode, based in Islamabad, Pakistan. I specialize in building dynamic, scalable web and mobile applications using modern technologies like Next.js, React.js, Vue.js, and Flutter. I enjoy collaborating with international clients and driving growth by delivering custom software solutions tailored to diverse needs. With hands-on experience in backend development, cloud infrastructure, and deployment strategies, I stay committed to continuous learning and applying best practices for software design and project management. I also have experience working remotely, which has honed my communication and cross-cultural collaboration skills, making me a valuable team player in fast-paced environments.…Hi, I'm Sunnan Haider, a passionate Full Stack Developer and Co-Founder of CalliumCode, based in Islamabad, Pakistan. I specialize in building dynamic, scalable web and mobile applications using modern technologies like Next.js, React.js, Vue.js, and Flutter. I enjoy collaborating with international clients and driving growth by delivering custom software solutions tailored to diverse needs. With hands-on experience in backend development, cloud infrastructure, and deployment strategies, I stay committed to continuous learning and applying best practices for software design and project management. I also have experience working remotely, which has honed my communication and cross-cultural collaboration skills, making me a valuable team player in fast-paced environments.

Available to hire

Hi, I’m Sunnan Haider, a passionate Full Stack Developer and Co-Founder of CalliumCode, based in Islamabad, Pakistan. I specialize in building dynamic, scalable web and mobile applications using modern technologies like Next.js, React.js, Vue.js, and Flutter. I enjoy collaborating with international clients and driving growth by delivering custom software solutions tailored to diverse needs.

With hands-on experience in backend development, cloud infrastructure, and deployment strategies, I stay committed to continuous learning and applying best practices for software design and project management. I also have experience working remotely, which has honed my communication and cross-cultural collaboration skills, making me a valuable team player in fast-paced environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Co-Founder/Full Stack Developer at CalliumCode

February 1, 2024 - Present

Founded a software solutions firm overseeing operations, client relations, and brand growth to deliver custom software solutions. Built dynamic websites and applications using MERN and Next.js. Deployed applications on platforms like Vercel, Netlify, and VPS, optimizing deployment strategies. Drove lead generation and secured international clients, fueling consistent growth for the firm.

Full Stack Developer at Genesis Engineering

February 1, 2025 - Present

Worked on full-stack development and frontend maintenance using Vue.js, JavaScript, and Node.js for internal projects. Fixed bugs, optimized UI performance, and implemented feature improvements. Built scalable full-stack features with React.js and Node.js, implementing modular monorepo architecture using Nx. Led development of an internal app using Next.js with server-side rendering and API optimization. Conducted research on AWS cloud infrastructure and studied Terraform-based infrastructure setups. Gained practical experience with Docker containerization and backend session validation using Node.js and Azure DevOps pipelines.

Full Stack Developer at Gogency

January 31, 2025 - September 4, 2025

Developed and optimized serverless functions using NHost Lambda for efficient backend processing including payment handling and real-time lead updates. Integrated third-party APIs to enable real-time updates on bookings and customer interactions. Designed and implemented a role-based access control system. Redesigned and optimized database structure to enhance schema clarity and performance.

Mobile App Developer at FlexDev (Remote - Germany)

December 31, 2023 - September 4, 2025

Collaborated with design and development teams to create demo projects and enhance cross-functional teamwork and agile workflows. Developed user-friendly mobile UI components translating design prototypes into functional interfaces. Contributed to project management including task prioritization and resource allocation. Built strong cross-cultural communication and collaboration skills working remotely.

Intern at Fauji Fertilizer Bin Qasim Limited (FFBL)

September 30, 2022 - September 4, 2025

Gained practical experience in WordPress for website updates and content management. Acquired foundational knowledge in SAP and ABAP enterprise resource planning systems. Developed teamwork and collaboration skills through group projects and cross-departmental initiatives. Enhanced time management and problem-solving abilities in a professional corporate environment.