Sumit Kumar — Director of Engineering

https://portfolio-website-production-8b67.up.railway.app/ As a seasoned Senior Engineering Leader with over 15+ years of experience, I specialise in building scalable mobile, web, and back-end platforms that drive business growth. I'm passionate about leveraging innovative technologies and cloud-native architectures to strategically align engineering with business goals. Proven ability to lead high-performing teams, I've successfully delivered impactful features across global markets. Whether it's spearheading digital transformation or optimising cross-functional collaborations, I thrive on turning complex challenges into opportunities for success. Skills: - Frontend: Swift, Kotlin, Flutter, Vue.js, HTML/CSS, JavaScript, Typescript - Backend / Server-Side: Python, Django, Node.js, Fastify, REST, GraphQL - Cloud/DevOps: AWS (EC2, S3, Lambda, Kinesis, Amplify), Firebase, Supabase, Fastlane, CI/CD, Jenkins, Cloud Zero, Railway - AI/ML: OpenCV, GenAI, LLM's, RAG, LangChain, n8n, AI agents - Databases: PostgreSQL, MySQL, Firestore, Redis, MongoDB, CoreData, Room DB, Vector DBs - Tools/Monitoring: Kibana, Splunk, Kafka, SonarQube, Mixpanel, Xcode, IntelliJ, Datadog, Split - Project Management: JIRA, Confluence, Agile, OKR, KPI, Airtable, Mural, Miro - Leadership & Soft Skills: Engineering Leadership, Business Acumen, Strategic Execution, Stakeholder Management, Hiring, Team Building & Mentorship

Stackforce AI infers this person is a Fintech and SaaS expert with strong leadership in mobile and backend development.

Location: Bengaluru, Karnataka, India

Experience: 15 yrs 6 mos

Skills

Engineering Leadership
Aws
Mobile Applications
Business Strategy
Software Development
Mobile Application Development
Architectural Design
Technical Discussions
Ios Development
Technical Leadership
Android Development

Career Highlights

15+ years of experience in engineering leadership.
Proven track record in driving revenue growth.
Expertise in cloud-native architectures and digital transformation.

Work Experience

American Express

Senior Engineering Manager (1 yr 8 mos)

Twin Health

Engineering Manager (1 yr 3 mos)

Twilio

Software Engineering Manager (9 mos)

Deloitte

Specialist Master(Architect) / Engineering Manager (1 yr 2 mos)

Senior Technical Consultant (3 yrs 10 mos)

Technology Consultant (2 yrs 3 mos)

Cognizant Technology Solutions

Senior iOS Developer (1 yr 4 mos)

Self-employed

Founder (2 yrs 10 mos)

Infosys

Senior System Engineer (3 yrs 5 mos)

Education

Bachelor of Technology (B.Tech.) at Institute of Education & Research(ITER),Bhubaneswar

Sumit Kumar

Director of Engineering

Bengaluru, Karnataka, India15 yrs 6 mos experience

AI EnabledAI ML Practitioner

Key Highlights

15+ years of experience in engineering leadership.
Proven track record in driving revenue growth.
Expertise in cloud-native architectures and digital transformation.

Stackforce AI infers this person is a Fintech and SaaS expert with strong leadership in mobile and backend development.

Contact

Skills

Core Skills

Engineering LeadershipAwsMobile ApplicationsBusiness StrategySoftware DevelopmentMobile Application DevelopmentArchitectural DesignTechnical DiscussionsIos DevelopmentTechnical LeadershipAndroid Development

Other Skills

Performance ImprovementTeam LeadershipGenerative AI ToolsGenerative AI DevelopmentAgentic AI DevelopmentLangChainVector DBRetrieval-Augmented Generation (RAG)MiddlewareASP.NET Web FormsObjective-CWeb ApplicationsFull-Stack DevelopmentLeadershipReact Native

About

Experience

15 yrs 6 mos

Total Experience

2 yrs 9 mos

Average Tenure

1 yr 8 mos

Current Experience

American express

Senior Engineering Manager

Sep 2024 – Present · 1 yr 8 mos · Bengaluru

Leading scalable credit and lending platform across 5+ markets (40M+ users), driving performance
improvements and ~20% revenue growth.
Enhanced reliability through observability, release governance, and production stability
initiatives.
Influenced engineering roadmap and platform standardization in partnership with senior
leadership to support long-term scalability.

AWSPerformance ImprovementEngineering Leadership

Twin health

Engineering Manager

May 2023 – Aug 2024 · 1 yr 3 mos · Bengaluru, Karnataka, India

Managed a cross-functional team of iOS, Android and Backend devs responsible for many areas of the Twin Health application.
Proposed and implemented freemium experience, resulting in a 75% reduction in CPL, and an increase in conversion by 22% significantly boosting marketing ROI and accelerating business growth.
Led Samsung Watch Integration using Health Connect, Zoom SDK Integrations to optimise Infrastructure and member experience.
Spearheaded the engineering process and collaborated with operations, growth, product, and leadership to support business growth plans.

Mobile ApplicationsBusiness StrategyAWS

Twilio

Software Engineering Manager

Jun 2022 – Mar 2023 · 9 mos · Bengaluru, Karnataka, India

Dec 2022 - Feb 2023
Engineering Leader for Conversations - SDK + Convo Services
Proposed and ideated to build UIKit for Conversations
Led full-stack team to migrate SDK and Services to the latest tech stack.
June 2022 - Dec 2022
Engineering Leader for Authy App & SDK - FullStack
Led a 2FA application with multi-device support and encrypted recovery backups, serving 5M+ MAU.
Grew engineering team from 4 to 12 strong engineers across iOS, Android, and Backend, resulting in a 150% increase in feature delivery velocity.
Led the development of an intelligent verification solution to achieve a higher success rate for messaging channels at a lower cost, increasing the success rate from 60% to 72%.
Collaborated cross-functionally on roadmap development and deliverables.
Technologies: Android (Kotlin), iOS (Swift), Ruby/GoLang,AWS services (S3, EC2, Kinesis, Lambdas), MongoDB, Kafka , ELK stack, Java

Software DevelopmentAWSMobile Application Development

Deloitte

3 roles

Specialist Master(Architect) / Engineering Manager

Promoted

Apr 2021 – Jun 2022 · 1 yr 2 mos

Worked as Engineering Manager(Mobile / Fullstack) and Architect, was held responsible for software architecture, solution design, and development practices across multiple projects and domain.
Delivered 8+ B2C/Enterprise applications & SDK's across various domains
Build useful library/SDK's for the team.
Ideated & created a website to generate automated files required for CI/CD setup for mobile applications, reducing effort by ~80%

Software DevelopmentArchitectural DesignEngineering Leadership

Senior Technical Consultant

Promoted

Aug 2017 – Jun 2021 · 3 yrs 10 mos

Worked on various enterprise application development and implementation (iOS & Android), including solution architecture, project management, design and reviews, and CI/CD for mobile engagements both domestically and internationally.
Architected and implemented mobile app-based digital solutions.
Developed smart digital solutions using ML/AI to automate human body temperature and mask screening. Awarded for an innovative idea and created a prototype presented at Deloitte Global Innovation. Open-sourced the prototype.

Mobile Application DevelopmentTechnical DiscussionsTeam Leadership

Technology Consultant

May 2015 – Aug 2017 · 2 yrs 3 mos

Deloitte Digital - Working focused in the Mobility domain , mainly on iOS Application Development

Cognizant technology solutions

Senior iOS Developer

Dec 2013 – Apr 2015 · 1 yr 4 mos · Bangalore Area, India

iOS developmentTechnical Leadership

Self-employed

Founder

Jun 2012 – Apr 2015 · 2 yrs 10 mos

Calorie Meter - Helping Your fitness
Health and fitness app published on App Store for iPhone and iPad's.
Mobile app as a one-stop solution for your health & fitness
Please follow this link for(app details & screenshots)
http://skappsmobile.blogspot.in/2013/05/calorie-meter-app-for-your-smartphone.html
App store link : https://itunes.apple.com/us/app/calorie-meter-helping-your/id645445307?mt=8