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I have a deployed smart contract written in Solidity that is currently facing issues such as transaction failures and incorrect state updates. I’m looking for an experienced blockchain developer to review, debug, and resolve these problems to ensure the contract functions reliably. You will review the existing smart contract code to identify the root causes of transaction reverts and incorrect token balances or state updates. The task also includes fixing any inefficiencies related to gas usage and improving overall contract performance. After implementing fixes, you will thoroughly test the contract using a local development environment such as Hardhat, Truffle, or Remix. The goal is to ensure stable execution and correct behavior under different scenarios. Strong expertise in Solidity and Ethereum is required. You should be comfortable with debugging smart contracts and using development tools like Hardhat, Truffle, or Remix. Knowledge of gas optimization techniques and smart contract security best practices is essential. You will provide the corrected and fully functional smart contract code. Additionally, include test cases demonstrating proper functionality and a short report explaining the identified issues and how they were resolved.
Project ID: 40430605
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Active 9 days ago
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42 freelancers are bidding on average $15 USD/hour for this job

Hi, ★★★ Solidity Expert ★★★ 7+ Years of Experience ★★★ I can debug and resolve issues in your smart contract with including transaction fixes and performance improvements. This will include: - Reviewing the existing smart contract code to identify root causes of transaction failures. - Fixing inefficiencies related to gas usage and improving overall contract performance. - Thoroughly testing the contract using Hardhat, Truffle, or Remix. - Providing a short report explaining the identified issues and resolutions. I will follow a structured approach to ensure all aspects of the contract are covered, focusing on reliability and security best practices. Ready to start once you provide access to the smart contract code. Thanks!
$15 USD in 40 days
8.1
8.1

Hi there, I’ve reviewed your PHP project requirements and would be glad to help. With 5+ years of experience in PHP and backend development, I specialize in creating secure, scalable, and high-performing web applications using modern frameworks like Laravel and CodeIgniter. I’ll begin with a clear development plan, share regular progress updates, and ensure the final product is well-tested and optimized for performance and security. Let’s connect to discuss your project goals — I’m ready to get started! Best, Bhargav PHP Developer | Laravel & Backend Expert
$10 USD in 40 days
6.8
6.8

Hello I understand you're looking for an experienced developer to help with your deployed Solidity smart contract. With 5+ years in full-stack development and a strong focus on blockchain, I've successfully optimized and debugged numerous smart contracts, ensuring security and efficiency. Let's connect to discuss how I can ensure your contract performs flawlessly and securely. Giáp Văn Hưng
$17 USD in 7 days
6.7
6.7

Hello, I can help debug your Solidity contract by reviewing the logic behind the failing transactions and the incorrect state updates you’re facing. I keep explanations simple and clear so you know exactly what was fixed and why. I’ll go through the contract, correct the issues causing reverts and wrong balances, and make sure it performs reliably with clean, optimized code. I will also provide the updated contract, test cases, and a short report once everything runs smoothly. Thanks, Teo
$25 USD in 22 days
6.5
6.5

As a well-versed Full Stack Developer and Digital Solutions Expert with over a decade of experience, I believe I can provide the expertise you need to fix the bugs and transaction errors in your deployed smart contract. I specialize in Blockchain and Ethereum development, making me fluent in Solidity, well-acquainted with debugging tools such as Hardhat, Truffle, and Remix. My exhaustive knowledge of gas optimization techniques paired with my familiarity with smart contract security best practices is exactly what you need to address your issues efficiently. In addition to identifying the root causes behind transaction reverts and incorrect state updates, I ensure that the code I write performs reliably in different scenarios by rigorously testing it in local development environments first. Understanding how vital stability is to an application's success, I assure you that my fixes will not only resolve the known issues but also optimize gas usage for future transactions. Lastly, providing long-term support is one of my core values. Therefore, along with delivering fully functional smart contract code and thorough test cases demonstrating proper functionality, I will also include a detailed report explaining all identified issues and how they have been resolved. It would be a privilege for me to turn your vision into a reality
$12 USD in 40 days
6.3
6.3

I’ve helped projects with similar issues where transactions failed due to subtle bugs in state management or improper error handling. First, I’ll review your Solidity code to pinpoint why transactions are reverting and why state updates don’t match expectations. I’ll check for common pitfalls like reentrancy, incorrect modifiers, or unchecked external calls. To catch gas inefficiencies, I’ll analyze your contract’s logic and suggest optimizations like minimizing storage writes or using cheaper data types. After fixes, I’ll run thorough tests in Hardhat to simulate all scenarios causing errors. A quick question: Are there specific transaction patterns or inputs that consistently trigger failures? Also, do you have existing test cases I can build on, or should I create new ones from scratch? Once I complete debugging and testing, I’ll deliver a clean, optimized contract, test scripts proving stable execution, and a summary detailing each fix and improvement. I’m ready to start fixing your contract to get it reliable and efficient.
$11.50 USD in 7 days
5.9
5.9

With my expert-level proficiency in PHP and extensive experience debugging, I am well-equipped to handle smart contract issues and optimize their performance, specifically targeting miscommunications like transaction failures and state updates as detailed in your project description. My deep knowledge of Solidity and Ethereum ensures I understand the nuances of smart contracts and am adept at finding the root causes of these bugs. Moreover, having worked on numerous web engineering projects over a decade, I prioritize reliability, high-performance, and security - traits that are essential for enhancing the functionality of your smart contract. If chosen for this job, I will address not only the existing errors but also analyze the code for any potential vulnerabilities using the highest standards of smart contract security best practices. Additionally, through my proficiency in using development tools such as Hardhat, Truffle or Remix, I can provide you with an optimized gas usage solution to remove any inefficiencies in your current system. Rest assured that my delivery will include properly functioning smart contracts alongside detailed test cases showcasing their robustness. With me, you're not just getting a technician - you're selecting a partner who values top-notch delivery, stable execution, and consistent client communication. Let's make your smart contract truly smart together!
$8 USD in 1 day
6.0
6.0

Hello there, I hope you are doing well. I’m a focused Ethereum/Solidity developer who specializes in debugging, optimizing gas usage, and ensuring reliable contract behavior. I’ve worked extensively with Solidity, Hardhat, and Truffle to identify root causes of reverts, fix incorrect state updates, and implement efficient, secure fixes without changing intended logic. I’ve reviewed many contracts with issues like failing transfers, unexpected balance mismatches, and gas inefficiencies. I will thoroughly audit your code, reproduce failures in a local environment, fix the root causes, optimize where possible, and implement robust tests to cover edge cases. I’ll use Hardhat or Remix for quick iterations and provide a clean, fully functional contract along with test cases that demonstrate correct behavior under different scenarios. I’ll also include a concise report detailing the issues found and how they were resolved. I can handle the work end-to-end based on my experience and past successes. You’ll get a solid, well-tested solution delivered promptly. Best regards, Billy Bryan
$20 USD in 22 days
4.6
4.6

Hello, I can review and debug your deployed Solidity smart contract to identify the causes of transaction failures, incorrect state updates, and token balance inconsistencies, then implement secure and gas-efficient fixes. I’ll thoroughly test the corrected contract using Hardhat or Remix, provide clear test cases covering different scenarios, and deliver a concise report explaining the issues found, the fixes applied, and the optimization improvements made.
$15 USD in 40 days
4.5
4.5

Dear Client, I’m an experienced full-stack developer with over 10 years of experience in web and mobile application development, specializing in building scalable, responsive, and high-performance solutions for diverse business needs. I understand you are looking for a reliable developer to build or improve your project, including web or mobile applications similar to CRM, dashboards, or APIs, and I have worked on similar solutions successfully. My skills in React, Vue, Laravel, PHP, Python, REST APIs, and database design ensure efficient and high-quality delivery. Feel free to share more details or ask questions. I’m ready to refine my approach to match your exact requirements. Looking forward to working with you. Best regards, Md Ruhul Ajom
$10 USD in 40 days
5.4
5.4

Hi there, As an experienced Full Stack Web Developer with a significant background in PHP and other backend technologies, I am confident in my ability to successfully debug and resolve issues in your smart contract. Despite specializing in Solidity and Ethereum, I have also been extensively involved in bug fixing, enhancing performance, and optimizing code for various projects. Let's discuss the details via chat. Regards, Shaykhnazar
$12 USD in 40 days
3.7
3.7

Hi, Your Solidity debugging project caught my eye because reviewing and fixing smart contracts is exactly the kind of work I have focused on for the past 6 years, and I have completed several similar projects end to end including tracing transaction reverts, fixing incorrect state updates, and the gas optimization details that usually cause trouble if they are not handled carefully. I recently finished a Solidity audit and fix for a token contract that included resolving failing transfers, correcting balance update logic, and adding full Hardhat test coverage, and before that I delivered a similar debugging task on a staking contract with reentrancy fixes, gas savings, and a clear written report, both of which gave me a strong feel for what your project will need. Here is how I am thinking about your build. I would start with a short kickoff to get the contract code, failing transaction hashes, and any error traces, then run a full review to identify the root causes so you can see findings early. From there I would apply the fixes, optimize gas where it helps, write Hardhat test cases covering the broken scenarios, and close with a short report explaining each issue and how it was resolved. One small thought, I would suggest Hardhat with a forked mainnet setup for testing, since it reproduces real conditions and keeps the fixes reliable. For cost and timeline, I estimate around 300 and roughly 4 to 6 days to delivery, depending on contract size. Best regards
$12 USD in 40 days
3.8
3.8

Hi, I have carefully reviewed your project details and understand the critical issues you are facing with your Solidity smart contract, including transaction failures and incorrect state updates. With strong expertise in Solidity and Ethereum, I specialize in debugging and optimizing smart contracts for reliable and gas-efficient performance. I will start by thoroughly reviewing your existing code to identify the root causes of transaction reverts and incorrect token balances. Following that, I will optimize gas usage and fix any inefficiencies. I am very comfortable using development tools like Hardhat, Truffle, and Remix to comprehensively test the contract under various scenarios to ensure stability and correctness. After the fixes, I'll provide you with the corrected smart contract code, detailed test cases proving the functionality, and a concise report explaining the bugs and how I resolved them. I am ready to start immediately and aim to deliver the fully functional contract within 5 days. Could you please share the current smart contract code and any specific transaction errors you have encountered? Best regards,
$10 USD in 38 days
3.9
3.9

I’ve successfully resolved similar transaction revert issues for various DeFi protocols where complex state management and gas optimization errors were causing critical execution failures. Having audited and debugged numerous Solidity contracts across EVM-compatible chains, I understand how vital it is to quickly pinpoint whether the bottleneck lies in logic overflows, restrictive reentrancy guards, or unexpected out-of-gas errors. My focus is on restoring your contract’s operational integrity while ensuring the security of the underlying assets and user funds remains completely uncompromised throughout the debugging process. My technical approach involves running a comprehensive trace of failing transactions using Foundry’s cheatcodes or Hardhat’s debug environment to isolate the exact opcode where the revert occurs. I will systematically check for common pitfalls such as incorrect access controls, improper state updates, or gas-heavy loops that might be exceeding block limits. Once the root cause is identified, I’ll implement gas-optimized fixes and rigorously test them against local mainnet forks to ensure they perform correctly against the current live state. Finally, I’ll provide a brief summary of the technical changes to ensure your team understands the logic adjustments and how to prevent similar regressions. To help me diagnose this quickly, are these errors occurring on a specific mainnet, and do you have the source code currently verified on a block explorer? Also, have there been any recent changes to the external dependencies or oracles the contract interacts with? I’m available for a quick chat to review the error logs and align on the fastest path to a resolution; I can prioritize this fix immediately if it is impacting your production environment.
$25 USD in 7 days
3.3
3.3

I'll review your deployed smart contract written in Solidity to identify the root causes of transaction reverts and incorrect token balances or state updates. I'll use development tools like Hardhat, Truffle, or Remix to thoroughly test the contract and implement fixes to improve gas usage and overall contract performance.
$15 USD in 5 days
4.5
4.5

With my extensive experience in software engineering and a focus on backend development, I'm confident I can successfully identify and rectify the existing issues with your deployed smart contract. Even though my previous work has primarily centered around dynamic web and mobile application development using technologies such as React Native, Flutter, Bubble, PHP, JavaScript, HTML, CSS, and MySQL; I've developed a keen interest in blockchain technology. I understand the importance of robustness and reliability of smart contracts on the Ethereum network. Having worked with several development tools like Hardhat, Truffle, or Remix in my previous projects, I'm comfortable debugging complex systems to provide thorough resolutions. Further-given my love for problem-solving and continuous learning, I can quickly adapt to your particular codebase. Not only will I fix the transaction reverts and incorrect state updates but also improve overall contract performance by optimizing gas usage. In addition to delivering solid code, I will provide comprehensive test cases that account for different scenarios. My commitment to high-quality work and constant improvement align perfectly with your aim of ensuring stable execution for your smart contract. I eagerly await the opportunity to contribute to this innovative project while adding value to my expertise in blockchain technology.
$12 USD in 40 days
2.8
2.8

Hey , I just finished reading the job description and I see you are looking for someone experienced in PHP and Blockchain. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am- 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Abdul Haseeb Siddiqui
$15 USD in 21 days
2.4
2.4

Hello, I’ve reviewed your project summary and I’m confident I can identify and fix the root causes behind transaction reverts, incorrect token balances, and flawed state updates in your Solidity contract. I will perform a thorough code review, pinpoint inefficiencies affecting gas usage, and implement robust fixes focused on correctness, security, and performance. My plan includes: 1) line-by-line debugging to locate revert conditions, improper state transitions, and balance miscalculations, 2) refactoring where needed to strengthen access control, enum/state handling, and token accounting, 3) gas-optimizing patterns and efficient ERC-20/ERC-721 interactions, 4) comprehensive tests with Hardhat (or Truffle/Remix) simulating edge cases, reverts, and stress scenarios, and 5) documentation and a short report detailing root causes and applied fixes. I will deliver the corrected contract code, a complete test suite, and a concise report highlighting the issues and resolutions. If you would like, I can tailor the tests to your contract’s exact interfaces and include deployment scripts to integrate with your existing workflow. Best regards,
$10 USD in 35 days
2.3
2.3

I've done quite a bit of this transaction reverts, broken state updates, and gas bloat are usually symptoms of a handful of well-known Solidity patterns gone wrong (reentrancy guards applied in the wrong order, storage vs memory confusion, integer overflow in older pragma versions, or events emitted before state is finalized). I can usually pinpoint the root cause within an hour of reading the contract. My workflow: I'll pull the code into Hardhat, reproduce your exact failure scenarios with forked mainnet state if needed, then fix and verify. You'll get back the corrected contract, a test suite that covers the scenarios that were breaking, and a plain English report explaining what was wrong and why the fix holds. A couple of quick questions so I can give you an accurate estimate: What Solidity version is the contract compiled against, and is this on mainnet, a testnet, or a private chain? Do you have any existing test files, or am I starting the test suite from scratch? Can you share the contract code and any error messages or transaction hashes from the failures? That'll let me give you a concrete timeline rather than a rough guess. I'm available to start immediately
$15 USD in 30 days
2.5
2.5

Hey, ✅ I CAN START NOW ✅ I’ve worked on something very similar. What really matters here is identifying and resolving transaction failures and state update errors in Solidity contracts. Most projects fall apart when these issues aren't addressed properly. I recently debugged a DeFi project with similar transaction errors, ensuring smooth operations. While I haven't specifically fixed this exact type of contract, I have a solid understanding of Solidity and debugging tools. My approach involves meticulous code review, targeted fixes, and extensive testing for reliability. Let's chat! -Dorofii
$10 USD in 40 days
1.9
1.9

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