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Cryptography is the science of encrypting and decrypting information to ensure secure communication and data protection. By using complex algorithms and cryptographic protocols, cryptographers safeguard sensitive data from unauthorized access. Whether it's securing online transactions, protecting personal information, or developing blockchain technologies, cryptography plays a critical role in modern cybersecurity.
Looking to enhance your data security with an expert in cryptography? Freelancer is the best-rated platform for hiring Cryptographers. Whether you need a cryptographic algorithm specialist, a blockchain developer, or a cybersecurity expert, you'll find the widest range of professionals for hire. Freelancer's Milestone Payment system ensures you only pay when you're 100% satisfied.
Post your project for free and connect with skilled Cryptographers ready to start today. Compare bids, ratings and portfolios, and only pay when you're happy with the work.
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8.2
8.2
100%

Lahore, Pakistan
$50 USD per hour
I've 13+ years of programming experience. 5 years full-time freelance. 140+ web and mobile applications shipped with active userbases. I build secure, scalable, production-ready blockchain and full stack systems that solve real business problems. BLOCKCHAIN & WEB3 > Smart Contract Development in Solidity and Rust covering ERC20, ERC721, and ERC1155 standards. I deliver complete decentralized systems end to end. Smart Contract Engineering and Deployment > DeFi Protocol, Staking, and Yield Farming Development > NFT Marketplace Development with Minting, Trading, and Royalties > DEX and CEX Exchange Platform Development > Crypto Wallet Development, Custodial and Non-Custodial > Web3 Integration, Blockchain Security and Contract Auditing * Networks: Ethereum, Bitcoin, Solana, XRPL, Stellar, Hyperledger, Corda FULL STACK & BACKEND > Node.js, Laravel, Django, Flask, FastAPI, React.js, Next.js, REST API Development, Microservices Architecture, PostgreSQL, MySQL, MongoDB, Redis MOBILE DEVELOPMENT > React Native, Flutter, Swift, Kotlin, iOS and Android, Cross Platform Mobile Apps, Web3 Mobile Wallet Development, Mobile API Integration AI & ML INTEGRATION > OpenAI API Integration, GPT-based Product Development, Generative AI, Decision Tree, Random Forest, KNN, Linear Regression, Recommendation Engines, AI Automation Workflows CLOUD & DEVOPS > AWS, Google Cloud, Azure, Docker, CI/CD Pipelines, Server Security, Performance Optimization, Selenium, Scrapy, BeautifulSoup Data Pipelines I lead a team of engineers delivering large-scale Web3, fintech, and software platforms with a strong focus on architecture, security, and performance. Every project starts with proper planning and ships production-ready. I work with startups and enterprises to deliver Blockchain, Web3, AI, and Full Stack solutions designed for scale, security, and long term growth. Best Regards, KEYWORD INDEX Blockchain Developer, Smart Contract Developer, Solidity Developer, Rust Developer, DeFi Developer, NFT Marketplace Developer, Crypto Wallet Developer, DEX Developer, CEX Developer, Web3 Developer, Ethereum Developer, Solana Developer, Bitcoin Developer, XRPL Developer, Stellar Developer, Hyperledger Developer, Corda Developer, ERC20 Developer, ERC721 Developer, ERC1155 Developer, React Native Developer, Flutter Developer, iOS Developer, Android Developer, Full Stack Developer, Node.js Developer, Laravel Developer, Django Developer, Next.js Developer, React.js Developer, AWS Developer, Docker, PostgreSQL, MongoDB, OpenAI Integration, AI Developer, ML Developer, Microservices Developer, REST API Developer, Mobile App Developer, Fintech Developer, Web3 Mobile Wallet Developer

8.8
8.8
100%

Hyderabad, Pakistan
$30 USD per hour
Hello there! I'm Nabeel, a Top Rated Verified & Preferred Freelancer on this platform, your one-stop-shop for all your design needs. With over nine years of experience in the industry, I am specialize in delivering creative and innovative design solutions that meet your specific requirements. Whether you need a brand-new logo, a brochure, a label, or any marketing design-related project, I am here to help. I have a proven track record of delivering top-notch quality work that is reliable and delivered on time. My objective is to bring your vision to life and exceed your expectations with simple and creative solutions to the communication needs of your project. My primary skill set includes designing: Logo/Brand Guide Brochure/Flyer Label/ Sticker Business Card Letterhead PPT Pitch Deck/Company Profile Advertisement Illustration Product Packaging T-shirt Designs Social Media Kits Don't just take my word for it! Explore my portfolio at www.nabsstudio.com to see the quality of my work firsthand. You can also read reviews from recent clients which will give you a better sense of the results I have achieved. Whether you need a logo for your brand or packaging for your product, I've got you covered. Simply click on 'Request Quote' to get a free quotation for your project. Thank you for taking the time to review my profile, and I look forward to working with you!

9.0
9.0
97%

NSR, Pakistan
$30 USD per hour
Hi, I’m Khalid, founder of a senior development team specializing in high-performance web & mobile applications using modern JavaScript technologies. With 15+ years of development experience and a team of expert engineers, we build scalable, secure, and maintainable software that drives business growth. I have completed about 96% Projects successfully. 4% are also completed from our end. They counted incomplete because clients couldn't mark completed and left without feedbacks. If you want to know about my client's views go through their feedbacks from last 8 years or so not just first page. WHY YOU CHOOSE ME? 100% Client Satisfaction 100% Money Back Guarantee. No Advance Payment FLEXIBLE POSSIBLE PAYMENT TERMS: I promise to deliver the project before any PAYMENT is done. I also offer to start the job and show you the progress without project being awarded so if are satisfied with initial progress then you can award officially. Some Wordpress sites I did recently https://culina.au https://vgfoodstory.com Genesis theme http://mecs.nl https://hotelkareldestoute.nl/ http://teleworldsolutions.com/ http://ancillarymedsolutions.com https://www.bnbisrael.com/, Elementor Based sites built https://eurekaprint.com.au https://acm-audio.de/ https://clikdigital.com.au Codigniter websites I did http://paystubsnow.com http://validgrad.com/beta/ http://kryptoshare.com/beta http://playblackjacknow.com/beta/ Laravel projects http://keysender.co.uk/ http://www.pricespectre.com/ https://www.qtyman.com/ http://brouhahasound.com/

8.6
8.6
95%

Karachi, Pakistan
$25 USD per hour
A dominant Harvard Grad who is simultaneously being integrated into the diverse business consciousness with an in-depth understanding of how to scale operations for best results, I am skilled at guiding people and businesses, and developing processes to ignite growth within an organization for funding, expanding, and maximizing profits. Whether you need your idea to be analyzed that how feasible it is, your firm to be formed or registered, multiply your revenues through a new marketing approach, expand in new markets through successful strategies, or revive from de-growth by competing with the industry giants, my professional attitude and services are available to assist you in achieving the goals. Better to be called a Business Consultant, I'm here to help you discover the answers on how to improve your Business Processes, Blueprint, Margins, Efficiency, and even Customer Satisfaction. Whether an Advisory Project or Implementation Project, I am capable of managing all the phases starting from the Preparation, Information Gathering, Data Analysis, till the deliverable of information for all the stakeholders involved. I revel in facilitating collaboration and contributing to the overall performance of each, such as Creatrox.com, as I assisted them from soup to nuts now it became a brand & generating great revenues annually. As a market analyst, I have assessed details like the economic, employment, educational, and even the ecological health of the area. I have examined local social, technology, and political issues, and determined whether those factors match your personal and financial goals and preferences. I don't settle for anything less than your very best, so connect with me!

8.2
8.2
98%

islamabad, Pakistan
$40 USD per hour
Hello Everyone, I am Faisal Manzoor Hussain, professional full stack developer holding experience in website development, desktop development and hybrid application development with proven success. I'm here to help businesses all over the world to grow their online presence through mobile apps and website development services. My target is to help these companies automate their complex business logic. I also hold specialization in developing APIs and integrate almost all sorts of APIs in your application. I also automate business processes to help your business run smoothly. Why should you hire me? Reasons that sound logical in hiring me include ● 99% Completion rate ● Top 3% in Freelancer.com directory ● Lower hourly rate for long term projects ● Life time free bug fixing guarantee Coming to our array of services, I offer my customers with: ● Mobile Responsive Website Design, Development & Optimization. ● Graphics Design & 3D Logo Design & Brand Identity. ● Android App Development (Native & Hybrid) ● Wix Studio, Google Apps Script, SalesForce, Xero, AMP, GSO and Progressive Web Applications Development ● Web Services (JSON, XML, SDK, SOAP, SAML, SSO) ● Website Maintenance (Regular Updates) ● Cloud Formation, JotForm.com, Bubble.io, klaviyo.com Major Web API Integrations are namely- - Google (Maps, Drive, Analytics, My Business, Tag Manager, Gmail) - Payment Gateways (PayPal, Square, Stripe + Connect, PayTM, Skrill, 2Checkout, Paynet, BrainTree). - Shipping Platforms (Fedex, Royal Mail) - SMS Gateway (Twilio, BrainsSMS, Clickatell) - Social (Facebook, Instagram, Twitter, LinkedIn, YouTube, Telegram) - AWS, GCP, Big Data, Big Query, AI, and Data Engineering - HealthCare (Stafferlink, Deputy) - Smoobu, Remote lock, MQTT, Web Sockets, - NFC, RFID, Sensors, Fingerprint, and QR processing, Aurdino, Power BI - Blockchain, Smart Contracts, Ethereum, Binance Smart Chain, NFT, Data Mining - Microcontrollers, PLC, Electronics, Robotics process automation, AI Automation Tools, MVC and CMS that I'm are compatible working with are: 1. OpenAI, Machine Learning, Chat GPT, Tensorflow 2. Codeigniter, Laravel 3. AngularJS 4. Wix 5. Squarespace 6. Shopify 7. Bootstrap, Foundation 8. Intel XDK Android Application Development 9. Ethr.js Solidity

6.0
6.0
99%

Lahore, Pakistan
$10 USD per hour
Hi. I have done Masters in Business and Information technology from University of the Punjab, Lahore. I am an Academic writer and proficient with APA, MLA and Harvard referencing styles. I have done IELTS 7 band (International English Language Testing System) and have full grip on English Language. Client’s satisfaction is my goal and meeting the deadlines is my style of work. I also have three years banking experience. I have worked in HSBC in Corporate Banking Department. I also have one year experience of working in Customer Support. I know how to handle customer queries. You won’t be disappointed to hire me. I have work experience of working on elance as well.

7.9
7.9
95%

Faisalabad, Pakistan
$35 USD per hour
I’m a Top-Rated Full-Stack Developer helping startups and businesses design, build, and scale modern web, mobile, and AI-driven applications. My focus is not just development — but delivering reliable systems that perform at scale. What I Deliver: ✅ AI-driven applications & intelligent automation ✅ Custom web & mobile app development (end-to-end) ✅ SaaS platforms & business systems ✅ E-commerce solutions & integrations ✅ Clean UI/UX with performance in mind ✅ Robust backend systems & API architecture ✅ Application optimization & scaling ✅ Secure deployments, testing & CI/CD workflows Tech Stack: ✅ Frontend: React, Next.js, TypeScript, Angular,Bootstrap,Tailwind css, shade cn ✅ Backend: Node.js, Express, Django, Laravel, Next js. ✅ Databases: PostgreSQL, MongoDB, Supabase, Prisma ✅ Mobile Apps: React Native (iOS & Android) & Flutter ✅ AI Systems: LLM integrations, RAG apps, AI agents I work closely with clients to transform ideas into production-ready products — focusing on scalability, performance, and long-term maintainability.

7.4
7.4
95%

Karachi, Pakistan
$40 USD per hour
I'm Muhammad Ashar, a passionate digital creator specializing in immersive experiences across game development, website design, and both 2D and 3D art and animation. With years of hands-on experience, I take pride in delivering high-quality, creative solutions that bring ideas to life. Whether you're looking to build a captivating game, design a modern and responsive website, or create eye-catching visuals and animations, I offer end-to-end services tailored to your specific needs. My Services: Game Development: Designing and developing engaging games for various platforms. Website Development: Creating clean, responsive, and user-friendly websites. 2D & 3D Art: Crafting visually stunning artwork and models for games, media, and more. Animation: Producing dynamic animations that enhance storytelling and audience engagement. Graphic Design: Delivering impactful designs for branding, marketing, and digital media. I'm committed to blending creativity with technology to help bring your vision to life. Let’s work together to turn your ideas into reality.

6.2
6.2
99%

islamabad, Pakistan
$25 USD per hour
As A Team We Provide Our Clients More Leisure And Ease By Doing The Required Tasks, On Time and On Budget. We Hold 11 Years Of Proven Track Record In Tech Oriented Tasks, Especially Data Science, Website Development, Professional Reports, Whitepapers, and Much More. Web Development: WordPress, Shopify, Custom Build. Plus Product Entry Pictures Adjustment, Speed Analysis. Whitepapers/Report Writing/Professional Documents. All Sort Of Ethical Niches, Highly Interested In New Tech Things, With Diagrams And Required Figures. Digital Content+ Marketing: Leading Post Content, Strategical Content Posting, #TAGS, Keywords, SEO Based. Articles: All Ethical Topics With Seo Friendly Is A Plus. ENGINEERING Based Solutions: We Are A Set Of Qualified Engineers, So We Deliver In All Dimensions Of Engineering Including Aviation, Civil, Electrical, Mechanical, Mechatronics, and Software. Who Are We? A Set Of Engineers, We Are The Best Solution For Your Problem. What You Have To Do Is? Just, Please Inbox Discuss And Share The Task, We Assure You, That Your Task Is Our Core Priority With Perfection. What Is Our Key Focus? 1-To Deliver The Work On Time. 2-To Deliver 100% Accurate Work. (100 % Unique, 100 % Plagiarism Free) 3-To Deliver The Work On Budget. (As Discussed) What Do You Need To Do? Just Inbox, Discuss And Hire Our Services.
A cryptographer is a security specialist who designs, analyzes, and implements cryptographic algorithms and protocols to protect data, communications, and digital systems from unauthorized access. Hiring a freelance cryptographer gives your business expert capability in encryption, key management, secure protocol design, and cryptanalysis without the overhead of a full-time security hire.
A cryptography expert builds the mathematical and engineering foundations that keep sensitive information confidential and tamper-proof. Their work underpins everything from password storage and TLS connections to blockchain consensus, secure messaging, and regulated financial transactions. A skilled cryptographer translates abstract mathematics into production code that resists real-world attacks.
Commercially, this matters because a single weak primitive or misconfigured protocol can expose customer data, break compliance requirements, or compromise an entire product. Bringing in a specialist cryptography consultant early reduces remediation cost, accelerates audits, and gives stakeholders defensible assurance that the system is built on accepted standards.
Freelance cryptographers handle a wide range of technical work depending on the project. Common deliverables include:
Strong cryptography specialists work fluently with industry-standard libraries and platforms rather than rolling their own primitives. Expect candidates to reference tools such as OpenSSL, BoringSSL, libsodium, Bouncy Castle, Tink, and HashiCorp Vault. For research and proof-of-concept work, they may use SageMath, PyCryptodome, or formal verification tools like ProVerif and Tamarin. Blockchain-focused cryptographers often use Circom, Halo2, arkworks, or snarkjs for zero-knowledge circuit development. Hardware-oriented projects may involve YubiHSM, AWS CloudHSM, Thales Luna, or TPM and secure enclave APIs.
Cryptography expertise is in demand across sectors where data sensitivity, regulation, or trust requirements are high. Typical engagements include:
Cryptography is a domain where small mistakes have large consequences, so candidate evaluation should be rigorous. Look for formal training in mathematics, computer science, or information security, and practical experience implementing standards-track algorithms. Strong portfolio signals include published security audits, contributions to open-source crypto libraries, CVE disclosures, peer-reviewed papers, or production systems they have designed.
Useful interview questions to ask shortlisted candidates:
Verify that candidates rely on established primitives rather than custom designs, and that they document threat models and assumptions clearly. Certifications such as CISSP, OSCP, or vendor-specific HSM credentials can support a profile, but demonstrated work matters more.
Freelancer.com gives you access to a global pool of cryptography experts, security engineers, and applied mathematicians ready to bid on your project. You can compare profiles, portfolios, ratings, and verified credentials side by side, then engage the freelancer whose background fits your scope. Whether you need a one-time protocol audit, a long-term embedded engineer, or a zero-knowledge proof specialist for a blockchain build, freelancers on Freelancer.com cover the full breadth of the discipline. Clients set their own budgets and receive competitive bids, with Milestone Payments protecting funds until agreed deliverables are accepted.
Ready to secure your systems with proven cryptographic expertise?
Hiring a cryptographer is a structured process that rewards a precise brief and careful evaluation. Because the work is highly technical and the cost of a weak hire is disproportionately high, taking time on the brief and shortlist pays off. The three steps below outline how to move from project idea to awarded engagement.
Your project post is the single biggest determinant of bid quality. A clear, technical brief filters out generalists and attracts cryptography experts whose background genuinely matches the work. Head to the
Bids are short proposals revealing how each cryptographer interprets the brief, what approach they propose, and what timeline they consider realistic. Read carefully and shortlist candidates whose understanding of the problem matches your intent. A strong cryptography proposal references specific algorithms, libraries, and threat models rather than generic security language.
The final decision combines proposal quality with profile evidence. For cryptography, weigh consistency across past work more heavily than any single project, since reliable judgment matters more than one impressive deliverable. Look closely at written reviews from clients with similar technical depth.
A cryptographer focuses specifically on the mathematics and implementation of encryption, signatures, key exchange, and related primitives. A general security engineer covers a broader surface including network security, application hardening, and incident response. For algorithm design, protocol review, or zero-knowledge work, a specialist cryptography expert is the right hire.
Yes. Many engagements are short, fixed-scope reviews of a specific protocol, library, or smart contract. A typical audit produces a written report covering findings, severity ratings, and recommended fixes, and can often be completed within a few weeks depending on code size.
Using vetted libraries is the right starting point, but misuse of those libraries is the most common source of cryptographic vulnerabilities. A cryptography consultant verifies that primitives are configured correctly, that key management is sound, and that protocols compose safely for your specific threat model.
Timelines vary widely. A focused code review may take one to three weeks, while designing a new protocol, implementing zero-knowledge circuits, or migrating to post-quantum algorithms can run several months. Defining clear deliverables in the brief helps freelancers propose realistic schedules.
For most defined projects, an experienced freelance cryptographer offers deeper specialization at a lower coordination cost than an agency. Agencies make sense when you need parallel teams covering multiple security domains. Many clients combine both, using a freelancer for cryptographic depth alongside in-house engineers for integration.

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