Hire Expert Digital Signature Expert
Our Digital Signature Experts are specialized security professionals with deep expertise in Public Key Infrastructure (PKI), digital certificates, and cryptographic systems. They implement secure document signing solutions, ensure regulatory compliance, and integrate digital signature capabilities into existing systems.
Meet the engineer
Who you'll be working with
Not a faceless resource pool — the engineers who build your system and stay on it.
Muhammad Shabir
Senior Full-Stack Engineer | Secure Systems & Cryptography
Senior Full-Stack Developer with over 10 years of experience building secure, cryptography-backed systems. Has worked on blockchain and cryptography-based solutions for secure distributed systems, implemented end-to-end encryption for HIPAA and GDPR compliant third-party integrations, and secured document repositories and distributed authentication with IdentityServer4, OAuth2, and OpenID Connect across enterprise .NET platforms.
Cryptography & Secure Systems
Security & Authentication
Compliance & Regulation
Document & Data Management
.NET & Backend
Cloud & DevOps
Selected work
Blockchain & Cryptography Solutions
Worked on blockchain and cryptography-based solutions focused on secure, distributed systems, built alongside scalable ASP.NET Core and Angular application stacks.
HIPAA & GDPR Compliance Layer
Ensured HIPAA and GDPR compliance by implementing end-to-end encryption for secure interactions with third-party insurance providers in a healthcare platform.
Distributed Auth with IdentityServer4
Secured distributed authentication and authorisation by integrating IdentityServer4, OAuth2, and OpenID Connect across services, ensuring data privacy and regulatory compliance.
Centralized Document Repository
Developed a centralised document repository using SQL Server and Entity Framework, ensuring secure storage and seamless retrieval of business-critical documents.
Role-Based Access Control System
Designed a robust RBAC system managing distinct admin, manager, and employee roles and their permissions across an enterprise application.
High-Performance Financial Services
Developed financial services in C#, .NET, MSSQL, and Entity Framework handling real-time transaction processing while maintaining strict security compliance.
REST to gRPC Migration
Optimised API performance by transitioning from REST to gRPC, achieving a 30% reduction in response times and improving modular scalability across services.
Containerized Microservices Platform
Orchestrated containerised microservices deployments with Docker and Kubernetes, improving system reliability and horizontal scalability.
80%+ Test Coverage Programme
Strengthened test coverage with unit and integration testing in xUnit, driving overall effectiveness past 80% SonarQube coverage, backed by TDD with Jest, NUnit, and Playwright.
Experience
Senior Fullstack Engineer
Jan 2022 – PresentLawHQ
- Built scalable C# .NET Core applications for e-commerce and SaaS platforms, delivering across HR, eCommerce, and Healthcare within microservices and micro-frontend architectures
- Spearheaded architecture of a large-scale HR management system on .NET Core and Azure DevOps, and automated payroll in T-SQL cutting manual effort by 90%
- Reduced query execution time from 4m30s to 30s through a database optimisation strategy, and cut API response times 30% by migrating REST to gRPC
- Migrated legacy frontend components to Angular (RxJS, NgRX, Angular Material, SCSS) for a 50% boost in user engagement
- Secured distributed auth with IdentityServer4, OAuth2, and OpenID Connect, and ensured HIPAA/GDPR compliance via end-to-end encryption for third-party insurance integrations
- Raised test coverage past 80% SonarQube with xUnit, and automated reporting with Azure Functions saving 30 hours weekly
Senior Software Engineer
Feb 2019 – Dec 2021Ibex Pakistan
- Architected a SaaS platform on .NET Core, T-SQL, EF Core, and Amazon RDS, reducing inter-departmental paperwork by 80%
- Developed high-performance financial services in C#, .NET, MSSQL, and Entity Framework handling real-time transaction processing under security compliance
- Created and managed 5 production frontends in Angular with a shared component model, plus reusable TypeScript component libraries
- Migrated the notification service to real-time WebSockets with SignalR, improving user experience by 60%
- Applied TDD with Jest, xUnit, NUnit, and Playwright; resolved 100+ software issues and ran CI/CD for 10+ components on Azure
Full Stack Engineer
Apr 2016 – Nov 2018Asiansol Pakistan
- Developed and maintained 10+ backend systems, RESTful APIs, and microservices using .NET Framework, ADO.NET, and LINQ across SQL and NoSQL databases
- Broke monolithic applications into microservices, improving scalability and release cadence
- Designed a role-based access control system managing admin, manager, and employee permissions
- Built e-commerce sites in ASP.NET MVC and C# with product catalogues, shopping carts, and payment gateway integrations
- Implemented Redis caching to improve responsiveness of time tracking and reporting features
Fullstack Engineer
Mar 2018 – Sep 2019Zech Technologies
- Developed scalable full-stack applications using ASP.NET Core and Angular 8
- Worked on blockchain and cryptography-based solutions focused on secure, distributed systems
- Built and maintained RESTful APIs and backend services for enterprise applications
- Integrated ElasticSearch for advanced search and performance optimisation, and containerised applications with Docker
Fullstack Engineer
Mar 2017 – Dec 2018Authbytes
- Developed and maintained web applications using PHP and Laravel for business and enterprise solutions
- Built RESTful APIs and backend services focused on scalability and performance
- Worked on Android application development and integrated mobile apps with backend APIs
- Integrated third-party services, authentication systems, and payment gateways
Web Developer
Jun 2013 – Mar 2016Freelancer.com
- Designed, developed, and maintained 25+ custom websites and web applications across industries
- Delivered front-end interfaces with Angular.js and responsive CSS frameworks, working directly with clients on requirements and wireframes
- Built e-commerce platforms with Stripe, PayPal, and other payment gateway integrations
- Implemented WordPress CMS solutions enabling non-technical clients to manage their own sites
- Wrote unit and end-to-end tests with Jest, Cypress, and NUnit across all projects
Core expertise
.NET Ecosystem Architecture (ASP.NET Core, EF Core, SQL Server, Blazor)
Enterprise Angular & Frontend State Management (RxJS, NgRX, NgXS)
Cloud-Native Microservices on Azure & AWS (Docker, Kubernetes, Terraform)
Identity & Access Management (IdentityServer4, OAuth2, OpenID Connect, RBAC)
Healthcare & Fintech Compliance (HIPAA, GDPR, end-to-end encryption)
Developer overview
Comprehensive overview of our digital signature expert and their capabilities.
What we offer
Security specialists implementing digital signature solutions and PKI infrastructure.
Our team consists of highly skilled professionals with extensive experience in their respective domains, following industry best practices and staying current with the latest technologies and methodologies.
Core skills
Why choose our Digital Signature Expert?
Proven Track Record
Successful delivery of complex projects with measurable results
Fast Delivery
Agile development approach ensuring quick time-to-market
Latest Technologies
Always up-to-date with cutting-edge tools and frameworks
Ready to hire Digital Signature Expert?
Let's discuss your project requirements and get you connected with the perfect digital signature expert for your needs.