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What is cURL?

cURL is an open-source command-line tool and library used for transferring data across various network protocols like HTTP, HTTPS, and FTP. It's essential for developers working with web services, integrating RESTful APIs, or automating file transfers in applications. cURL Developers specialize in utilizing this tool to enable seamless data exchange, build robust network communication, and automate interactions with web servers.

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Looking to hire a cURL Developer to enhance your application's data transfer capabilities? Freelancer is the best place to find top-rated cURL Developers for every budget. With the widest range of professionals, you can connect with experts skilled in HTTP requests, RESTful API integrations, and automating file transfers. Freelancer's Milestone Payment system ensures you only pay when you're 100% satisfied. Post your project here and find the perfect cURL Developer on Freelancer today.

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Chanchal S.

5.0

807

8.6

99%

Noida, Gautam Bhudha Nagar, India

$20 USD per hour

✓ 800+ Successful Projects & 5-Star Reviews I'm a Senior Web Developer with 15+ years of experience specializing in WordPress, WooCommerce, Shopify, Custom PHP, Website Speed Optimization, Security Hardening, and SEO-friendly development. I help businesses: • Build high-converting websites • Create WooCommerce stores • Improve Google PageSpeed scores • Fix WordPress issues quickly • Remove malware and secure websites • Develop custom PHP applications My focus is on delivering fast, secure, mobile-friendly websites that generate results for businesses. If you need a reliable developer who communicates clearly and delivers on time, let's discuss your project.

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Matias Gaston P.

5.0

892

7.9

100%

Villa De Merlo, Argentina

$25 USD per hour

I started with BeOS in 2002, because of a friend, who showed me something other than Windows, Always I worked repair PC & Laptops. Now I have more 10 years of experience in Server Linux. I can manager servers dedicated, servesr VPS, servers shared, etc. Setup and management you server; Apache/Nginx/Tomcat. SMTP Postfix, POP/IMAP Dovecot. FTP Vsftpd, Proftpd, Pure-ftpd-mysql. Dns Bind9, dnsmasq. File Server & printer Samba (dc-ac). Network administrator: isc-server-dhcp, openvpn, etc. Install and renew SSL certicate. All services on cloud; AWS, Azure, etc. Also website and E-mail migrations. ALL panels and web managers. Management all Linux distributions. Setup, security and optimization your server. __________________________ VERY IMPORTANT!!! “Hi I'm Matias, someone is trying to impersonate me, this account is the only one active and verified by freelancer! I DON'T USE ANY OTHER MEANS OF CONTACT, ONLY FREELANCER CHAT!” -----------------------------------------

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Arman K.

4.9

436

7.9

96%

Lahore, Pakistan

$50 USD per hour

I am an Excel Expert and Certified Business Accountant with more than 8 years of experience as an Accounting consultant, Business Consultant, Tax Consultant, Including 3.5 years as an Auditor from PWC. I am an accomplished accounting and financial professional working primarily with small businesses, associations, and nonprofits. I have worked as a Accounting, Business and Finance Consultant since 2015 to 2018 in PWC. I am an accomplished, seasoned professional with more than 4 years of experience working primarily with Multi National Companies including Coca Cola Beverages Pakistan Limited and Descon Corporation Limited. I have also served as a senior Auditor in PWC. The organizations and companies I have worked with have been involved in Manufacturing, association management, technology, education, medical Services, professional services, retail, real state, eCommerce, agriculture, food & beverage, healthcare and financial markets. Below are some additional qualifications and accomplishments: • Specialize in applying “best practices” in all aspects of the accounting cycle to small and medium size businesses, nonprofit organizations and trade associations. These practices were learned by having worked for and with more than 75 small to mid-sized organizations. • Expert in Quickbooks. • Expert in Sage. • Designed extensive budget for companies covering all revenues and operational expenses and detailed budgets for all events based on historical expenses and attendance. • Responsible for all financial report preparation, analysis and presentation of the results and accompanied analytics to executive management and Board of Directors. • A Certified QuickBooks User and extensive hands on experience with PeachTree, Oracle Financials and various other accounting software packages. Expert knowledge of Microsoft Excel. Specialties Manufacturing • Accounting Consultancy, Auditing, Financial Consultancy, • Accounting Systems & System Implementation

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HireSEOAnalyser

5.0

2239

9.6

99%

PALI, India

$15 USD per hour

✅SEO Expert -> 2230+ Reviews with a 5.0 ⭐⭐⭐⭐⭐Profile ✅Result Driven SEO Strategies✅ Proven Success in Boosting SEO & Higher Rankings✅ Hello, My name is Mahipal, I am ranked in the Top 1% of Freelancers on Freelancer.com. I've successfully collaborated with over 5000+ SEO clients, I am an SEO Expert with 12+ years of professional experience in white SEO skills and knowledge of Google Core updates, guidelines, and algorithms. I am proficient in SEO across a wide range of countries, industries, languages, and web platforms. I believe in providing high-quality SEO services that produce real, measurable results. That’s why clients keep coming back and building long-term partnerships with me. I take a thorough approach to every client’s SEO needs, carefully addressing each issue to ensure that their website performs at its best. ✅ I will execute a strategic plan of Monthly SEO Service. I can provide you with the following: → Website Auditing Report → Strategic Keywords Research → Meta Tag Creation (Aligned with Google SEO Guidelines) → Technical On-Page SEO Optimization → High DA Backlinks (High Quality, Do Follow, Unique IP links) → Provide Weekly reports and insights into your SEO progress My objective is to address and resolve SEO problems while optimizing your website through both "Technical On-Page SEO" and "Off-Page SEO" strategies. My Goal is to enhance your site’s Google SEO-friendliness, Beat competitors, and drive organic traffic to achieve a Top #1 page Ranking on Google. Why you Hire me? ✔ 12+ Years of Trusted SEO Expertise ✔ Professional Team of SEO Experts ✔ In-Depth Keyword Research & Analysis ✔ Expertise in On-Page & Off-Page SEO ✔ Experienced in Local & Global SEO Campaigns ✔ Skilled in SEO Tools (Google Analytics, Ahrefs, SEMrush) ✔ Proven Track Record of Google 1st Page Rankings and Increased Traffic ✔ Transparent Reporting with Measurable Results ✔ Timely Project Delivery and 24/7 Availability ✔ Commitment to 100% White-Hat SEO Techniques ✔ Strong Communication with Clear, Actionable Reports and more.!! As an SEO expert, I invite you to review the feedback below from my clients, which reflects the impact of my work and the results I've delivered. If you're ready to take your project to the next level with My Expert SEO strategies, feel free to reach out via private message. I'm available 24/7 to provide ongoing support and ensure your success at every step of the process. Best Regards HireSEOAnalyser

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Web Solution Application

5.0

397

7.2

100%

Karachi, Pakistan

$30 USD per hour

Welcome to Web Solution Application! Managed by Ayaz, we are an elite team of expert full-stack developers specializing in robust backend architectures, custom web systems, and high-performance applications. With over a decade of professional experience in PHP and modern web ecosystems, we deliver zero-bug deployments engineered for optimal speed and reliability. Whether you need a high-end web application built from scratch, complex system troubleshooting, or seamless automated platforms, we have the technical mastery to turn your vision into reality. Our Core Technical Specializations: • Core PHP & Advanced Frameworks: Laravel, CodeIgniter, Yii, Symfony, Custom PHP • E-commerce & CMS Ecosystems: WordPress, Magento, Shopify, OpenCart, WooCommerce • Payment Gateway Engineering: Flawless integration of Stripe, PayPal, and international gateways with secure dynamic webhooks • API Architecture & Automation: Custom RESTful API development, WHMCS configurations, and third-party SaaS integrations • Server Optimization & Security: Mitigation of malicious bot traffic, Cloudflare security hardening, and performance fine-tuning Why Partner With Us? ✔ Institutional-Grade Quality: Clean, scalable, and secure coding standards. ✔ Comprehensive Pre-Deployment Testing: Rigorous sandbox and live-mode validations with extensive log tracing to ensure bulletproof stability. ✔ 100% Client Satisfaction: A proven track record of delivering successful projects on time and within budget. Let’s elevate your digital infrastructure. Click the "Hire Me" button today to schedule a discussion regarding your project goals!

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Ivan V.

4.9

3754

8.8

99%

Myronivskyi, Ukraine

$32 USD per hour

Professional software developer with over 25 years of overall experience in software development and maintenance looking for challenge projects fit my skills. Main specialization: • developing Windows Desktop and Web solutions (mainly using C, C++, C#, ASP.NET) • converting/translating/porting code from one programming language to another programming language. • writing wrappers around miscellaneous libraries, packages and SDKs, mainly for using it with other programming languages. • consuming HTTP based APIs, (RESTful APIs, etc) • scraping data from web sites, both with and without Selenium Secondary specialization: • developing Linux and cross-platform solutions and utilities. • scripts/utilities to process Excel spreadsheets • Microsoft Office Automation

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Murat K.

5.0

1831

9.1

99%

Antalya, Turkey

$45 USD per hour

I've been on internet since 1996. I always tried to do something with programming. Started with mirc scripting, then created my own websites (I had 1500+ websites when it was 2005) and earned a lot of money with domain parking and google adsense. Since I was not so good with programming, I was asking help from other people. But as you probably guess, I had many many problems with programmers. Then, I decided to improve my programming skills. Finally, I realized that coding is the coolest thing in the world. I feel better when I help other people over the world. This is how I became freelancer programmer :) I love coding and ready to help you. - Web Scraping / Crawling - Data extraction - Data conversion - API Integration - Wordpress plugin

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STALLIONi NET SOLUTIONS

4.8

984

9.6

98%

coimbatore, India

$12 USD per hour

Welcome to STALLIONi Net Solutions — a trusted web development team with 18+ years of experience and 900+ reviews on Freelancer.com. We build digital solutions that work — on time, on budget, and exactly as promised. What We Do: • Web Design & Development — HTML, CSS, JavaScript, ReactJS, AngularJS • Backend Development — PHP, Laravel, CodeIgniter, Node.js • CMS & eCommerce — WordPress, Shopify, Magento, Joomla • CRM & Automation — Zoho CRM, GoHighLevel, Zapier, QuickBase • Mobile Apps — iOS & Android (native & cross-platform) • AI & Python — Chatbot development & smart integrations • Graphic Design — Branding, UI/UX, digital assets Whether you're launching a new product, scaling an existing platform, or automating your business workflows — we bring the technical depth and communication skills to get it done right. Let's build something great together. + Team STALLIONi

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Wadiya Ralalage S.

5.0

820

7.5

100%

DEHIOVITA, Sri Lanka

$35 USD per hour

WebXtreams is a Sri Lanka based web developer. We are here to provide excellent service with 100% quality work. We just need your chance to show our job. We do all the web development related jobs for a reasonable cost. We have successfully completed over 1000 projects on freelancer and much more on private projects. So don't hesitate to choose us for your project, We guarantee 100% satisfaction on outcome... Thank You, Regards, Suneth

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Clients rate our cURL Developers

4.93 out of 5

from 24,838 reviews

How to hire a great freelance cURL Developer

A cURL developer is a software engineer who specialises in using cURL and libcurl to build, test, and automate HTTP, HTTPS, FTP, and other protocol-based data transfers between clients, servers, and APIs. Hiring a freelance cURL developer gives you targeted expertise in command-line data transfer, REST API integration, and low-level network debugging without the overhead of a full-time hire.

What does a cURL developer do?

cURL developers write scripts and applications that move data across networks using the cURL command-line tool or the libcurl library. They handle everything from one-off API calls to production-grade integrations that synchronise data between systems, scrape protected endpoints, or automate file transfers across servers.

Because cURL supports more than 25 protocols including HTTP, HTTPS, FTP, FTPS, SFTP, SCP, SMTP, IMAP, and WebSockets, a skilled cURL developer is often the person clients turn to when an integration breaks, an API responds unexpectedly, or a workflow needs to be automated quickly. Their work directly affects data accuracy, system uptime, and the reliability of any service that depends on third-party APIs.

Common deliverables from a freelance cURL developer

The output of a cURL engagement varies by project, but typical deliverables include:

Bash, PowerShell, or Python scripts that wrap cURL commands for scheduled API calls, data exports, or file synchronisation

libcurl integrations written in C, C++, PHP, Python, Go, Rust, or Node.js for production applications

REST API client implementations covering GET, POST, PUT, PATCH, and DELETE requests with proper header, cookie, and authentication handling

OAuth 2.0, JWT, API key, and HTTP basic authentication flows

SSL/TLS certificate handling, mutual TLS configuration, and debugging of handshake failures

Webhook receivers and senders, including retry logic and signature verification

Postman collection conversion into reusable cURL scripts and CI-ready test suites

Performance benchmarking and rate-limit-aware request pipelines

Detailed documentation, runbooks, and example requests for internal teams

Tools, libraries, and methodologies

A strong cURL developer is fluent in the broader ecosystem that surrounds the tool. Expect proficiency with:

cURL command-line flags including verbose mode, custom headers, cookie jars, multipart uploads, and proxy configuration

libcurl bindings in C, PHP cURL extension, PycURL, and Node.js libcurl wrappers

Postman, Insomnia, and HTTPie for request prototyping before converting to cURL

Wireshark, mitmproxy, and Charles Proxy for inspecting network traffic and debugging API behaviour

Git for version control, plus CI/CD platforms such as GitHub Actions, GitLab CI, and Jenkins for automated API testing

JSON and XML parsers including jq, xmllint, and language-native libraries

Shell scripting in Bash and Zsh, plus task schedulers like cron and systemd timers

OpenAPI and Swagger specifications for working from formal API contracts

Industries and use cases

cURL work cuts across nearly every sector that exchanges data over the internet. Common engagements include:

E-commerce platforms integrating payment gateways, shipping carriers, and inventory systems

Fintech and banking applications consuming market data feeds and transaction APIs

SaaS companies building internal tooling, monitoring scripts, and customer onboarding automations

Marketing and analytics teams pulling data from CRM, ad platform, and social media APIs

Healthcare and logistics businesses moving structured data between legacy systems and modern endpoints

DevOps teams writing health checks, smoke tests, and deployment verification scripts

How to evaluate cURL developer candidates

Look for evidence of hands-on API integration experience rather than generic backend credentials. Strong signals include public GitHub repositories with shell or libcurl code, contributions to API client libraries, experience debugging production network issues, and familiarity with at least one popular API ecosystem such as Stripe, Twilio, AWS, or Salesforce.

Useful interview questions to ask:

Can you walk me through how you would debug a cURL request that returns a 401 Unauthorized intermittently?

How do you handle paginated API responses in a long-running cURL script, and how do you make it resumable?

What is the difference between using --cacert, --cert, and --key flags, and when would you use each?

How would you convert a Postman collection into a set of automated cURL tests that run in CI?

Describe a time you used libcurl in a production application. Why did you choose it over a higher-level HTTP client?

Adjacent skills worth considering

Many cURL projects overlap with related disciplines. Depending on scope, you may want a freelancer who also brings API development, backend programming in Python or Node.js, DevOps automation, web scraping, shell scripting, or RESTful and GraphQL API design experience.

Why hire cURL developers on Freelancer.com

Freelancer.com gives you access to millions of vetted developers worldwide, including specialists fluent in cURL, libcurl, and the broader API integration stack. You can post a project on Freelancer.com and receive competitive bids within hours, compare portfolios across time zones, and award the work to a freelancer whose experience genuinely matches your brief.

Clients set their own budgets and review transparent profile data including ratings, completion rates, and verified payment methods before hiring. Milestone Payments hold funds securely and release them only when you approve the work, giving you control throughout the engagement. Whether the job is a one-hour debugging session or a multi-month integration build, the freelancers on Freelancer.com cover the full range of cURL expertise.

Post a project on Freelancer.com today and connect with skilled cURL developers ready to build, debug, and automate your API integrations.

What are the steps to hiring a freelance cURL developer?

Hiring a cURL developer is straightforward when your brief clearly defines the APIs, protocols, and deliverables involved. The three steps below walk you through posting the project, reviewing bids, and awarding the work to the right freelancer.

Step 1: Post your project on Freelancer.com

Your project post is the single biggest determinant of bid quality. A precise brief filters out generalists and attracts cURL developers whose experience genuinely matches your integration. Head to the post project page , where you fill in the brief, scope, timeline, and budget before publishing the project for freelancers to bid on.

Name the APIs or protocols involved, such as REST over HTTPS, SFTP file transfer, or SOAP endpoints

Specify the authentication method, including OAuth 2.0, API keys, JWT, or mutual TLS

List the deliverable format: standalone Bash script, libcurl integration in a specific language, Postman-to-cURL conversion, or CI-ready test suite

Share API documentation links, sample payloads, or sandbox credentials where possible

Note any constraints around rate limits, error handling, logging, or environments such as Linux, Windows, or Docker

Step 2: Review bids from freelancers

Bids are short proposals, not just price quotes. A strong cURL developer will reference your specific APIs, raise sensible clarifying questions, and outline how they plan to handle authentication, retries, and error states. Read each proposal carefully and shortlist candidates whose understanding of the work matches your brief.

Look for proposals that mention specific cURL flags, libcurl bindings, or scripting approaches relevant to your stack

Check whether the freelancer asks about rate limits, pagination, or edge cases — a sign they have done this before

Assess timeline realism against the scope of the integration

Note any sample scripts, GitHub links, or past API integration work attached to the bid

Use Freelancer.com chat to ask shortlisted candidates a clarifying technical question before deciding

Step 3: Evaluate freelancers and award the project

The final decision combines proposal quality with profile evidence. For cURL work, look for consistency across past API and scripting projects rather than a single impressive example. Past client reviews often reveal how a developer handles ambiguous specs and production debugging.

Review portfolio depth in API integration, shell scripting, and backend development

Check star ratings alongside the volume of completed projects

Read written client reviews for comments on communication, debugging skill, and code quality

Confirm verified payment method, completion rate, and on-time delivery rate

Award the project and use Freelancer.com Milestone Payments to release funds only as agreed deliverables are approved

What is the difference between cURL and Postman?

Postman is a graphical API client used for designing, testing, and documenting requests interactively, while cURL is a command-line tool and library used to execute those requests in scripts, applications, and automated pipelines. Most cURL developers use both: Postman for prototyping and cURL for production automation.

Can I hire a cURL developer for a one-off task?

Yes. Many cURL projects are short, scoped pieces of work such as fixing a broken API integration, writing a single automation script, or converting Postman collections into shell scripts. You can post a small fixed-price project and have it completed within days.

Do I need a cURL developer or a full backend developer?

If your project is primarily about HTTP requests, API integration, or scripted data transfers, a cURL specialist is usually sufficient and more cost-efficient. If you need server-side logic, database design, and application architecture in addition to API calls, hire a backend developer who also lists cURL among their skills.

How long does a typical cURL project take?

Simple scripts and bug fixes can be completed in a few hours, while building a robust API client with authentication, error handling, retry logic, and CI integration may take one to three weeks. Timeline depends on the number of endpoints, complexity of authentication, and documentation requirements.

What information should I share with a cURL developer before they start?

Provide the API documentation or OpenAPI specification, sample request and response payloads, authentication credentials or sandbox access, and a clear description of the expected behaviour. The more concrete the brief, the faster the developer can deliver working code.