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I am a solution-oriented software engineer with 5 years of experience building and maintaining customer-facing software. I specialize in Flutter-based mobile apps and related backend services, delivering reliable, scalable solutions for clients. I excel at collaboration, clear communication, and technical documentation, which helps teams stay aligned and deliver value quickly.…

Nikhil Sinha

App Developer, Full Stack Developer, Product Designer, +4

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I am a solution-oriented software engineer with 5 years of experience building and maintaining customer-facing software. I specialize in Flutter-based mobile apps and related backend services, delivering reliable, scalable solutions for clients. I excel at collaboration, clear communication, and technical documentation, which helps teams stay aligned and deliver value quickly.…

Available to hire

I am a solution-oriented software engineer with 5 years of experience building and maintaining customer-facing software. I specialize in Flutter-based mobile apps and related backend services, delivering reliable, scalable solutions for clients.

I excel at collaboration, clear communication, and technical documentation, which helps teams stay aligned and deliver value quickly.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Hindi

Advanced

English

Advanced

Bengali

Advanced

Spanish; Castilian

Intermediate

Work Experience

Software Engineer at Winjit Technologies Pvt. Ltd.

October 1, 2023 - Present

Owned product management for 3 banking products including Suryoday SF Bank Biz, Sidbi Bank SEP, and MUA EKYC. Built and maintained customer-facing and business-facing applications. Collaborated with developers to update and create new features. Designed and implemented foundational scalable Flutter project architecture including encryption/decryption formulas to standardize secure transactions across banking applications. Developed point of sale and delivery rider apps with features such as REST API integration, geolocation tracking, QR code generation and scanning, Bluetooth bill printing, local notifications, and Google Maps integration.

Mobile App Development Lead at Nextdoor Kitchens Pvt. Ltd.

August 31, 2023 - September 1, 2025

Owned product management of 3 major apps: Sorted customer/user app, Pulse POS app, and Quest delivery/rider app. Built and maintained customer- and business-facing applications. Collaborated with developers to create new features and nurture product development from scratch. Led frontend developer team and mentored junior developers.

Freelance Flutter Developer

April 30, 2022 - September 1, 2025

Built and maintained applications for clients. Collaborated with full-stack client teams and guided API developers to deliver APIs as per requirements. Managed deliveries and reported to project managers.

Freelance Flutter Developer at Self-Employed

September 30, 2023 - October 16, 2025

Built and maintained Flutter apps for clients; collaborated with full-stack teams; guided API developers to create APIs as per requirements; implemented core features and secure data handling for scalable Flutter projects, including CRUD operations, in-task discussions, and SSO integration.