Java project to connect to Bitcoin Blockchain

£18-36 GBP / hour

Closed

Posted

over 6 years ago

£18-36 GBP / hour

The following project shall be done with Java and a library facilitating use of the bitcoin protocol (most likely BitcoinJ). The project consists of two modules 1. Use BitcoinJ to connect to the blockchain and receive new updates. We want the ability to use ReactiveX (rxjava) to subscribe to: - transactions above a certain amount - transactions from or to a certain wallet adress 2. Use BitcoinJ (or any other protocol) to connect to a large number of nodes, whenever a new block is broadcast from one of these nodes, we want the local timestamp, the block number, and the hash to be recorded in a local database. The block itself does not need to be saved, since this is covered in module 1. This modules incentive is to be as sure as possible about the real timestamp of a new block. The higher the number of nodes we connect to, the higher the likelihood of getting a new block quicker. We want the whole project to be created using TDD (but with TestNG instead of JUnit). We prefer clean code over quick "elegant" hacks, and we require it to be safe in terms of concurrency issues. The source code shall be Java 8 compliant. If the project is a success and well within our standards, there will be offers of follow up projects. If you contact us, please tell us how experienced you are in the respective fields (Java, TDD) and in general related technologies, as well as provide some information about previous projects you did or technologies you used.

Java

Project ID: 15338172

About the project

16 proposals

Remote project

Active 7 yrs ago

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16 freelancers are bidding on average £30 GBP/hour for this job

@trustus

Hello, We have a team of Skilled Java-J2EE professionals with experience up to 8 years. ===== Our Expertise in Java / J2EE : * Desktop Applications : Swing, Eclipse Rich Client Platform, AWT, SWT, RMI * Frameworks: Spring, Spring Security, Spring Social, Struts, Hibernate ,JPA, Lucerne, Quartz, Ant, jUnit, DbUnit, Mybatis * Web Technology : JSP, JSTL, JSF, JQuery, Ajax, JavaScript, DWR, FCK Editor, Extjs * Application Servers : JBoss, WebLogic, WebSphere, Apache Tomcat, Glassfish * Databases : MySQL 4.x/5.x, Oracle 8i/9i/10g/11g, Postgre SQL * Web Services : SOAP, WSDL, RESTFUL Web Services, Apache Axis * IDE : Eclipse, Net Beans, Web Ratio (Model Based Application Development IDE) , Spring IDE * Payment Gateway : PayPal Integration [Experienced in integrating other payment gateways too] * Web Technology : JSP, JSTL, JSF, JQuery, Ajax, JavaScript, DWR, FCK Editor, Extjs * Project Management : SDLC, AGILE ===== We are available from Monday To Friday, 9 hours a day. Our timezone is GMT+5.30. Please initiate chat to check our understandings and queries. You will be able to communicate directly with the expert working on your project. We look forward to have long term engagement on the basis of quality of our work evinced in this project. Thanks.

£18 GBP in 45 days

4.9

(168 reviews)

7.9

@yassine008

Hi there, how are you? I am a programmer with good skills. I'm expert java/software/web developer with more than 7 years experience in IT area working with cutting edge technologies. I've just read your project description and i am interested in it. Please contact me for more details. Kindly Regards.

£27 GBP in 40 days

5.0

(42 reviews)

7.1

@dobreiiita

A proposal has not yet been provided

£22 GBP in 20 days

4.7

(407 reviews)

7.4

@polarjin2017

Hello? How are you? I am good in java. So i can help you if you want . i will never disappoint you. thank you

£30 GBP in 40 days

4.9

(20 reviews)

4.8

@anuragiitk

I am an IITK graduate and I have 9 years of experience in software development. I have 100% completion rate and I have finished all the projects with the highest level of customer satisfaction. I usually finish projects with ease on which other freelancers have already given up. I learn and understand new stuff very fast and finish the job with top quality and reliability.

£30 GBP in 40 days

4.0

(24 reviews)

5.6

@chesslover

Hello there. I am a Bitcoin Core (bitcoind/bitcoin-cli) programmer and I am very much interested in your project. I am also a Java architect/developer with over 16 years of experience, and I also do programming with the Nxt, Ethereum, and Stellar blockchains. I also have an active GitHub account where I have done most of my unit tests in TestNG. I am new though to RxJava and my experience with it is with Ethereum. Please see my profile for the rest of my portfolio and credentials. Thank you.

£27 GBP in 40 days

5.0

(1 review)

2.2

@neerajpaliwal49

Hi sir, I have the required skills outlined in the job description. I have advanced proficiency in J2ee/Java(recent version - upto Java 8), Angular.js , Node.js, React.js, JavaScript, JQuery, excellent front-end & back-end knowledge and am familiar with Hibernate and Spring-framework . I excel in Git, Struts, Tomcat, MongoDB, MySQL, HTML, CSS. With proper knowledge of tools like Maven, Heroku, Jenkins and ANT, I can create as well as suggest new techniques and technologies to meet product requirements. My excellent work ethic has provided me with many opportunities to accomplish goals that have earned me recognition at work. Some of my experiences include: - I have worked on complex Angular1, Angular2 app development. - Hands-on experience on 40+ Web apps with Great UI projects. - 5 years experience of commercial software development & Server-side Java script. - Worked on NodeJS, Java, Spring, AWS, AWS Lambda for several years. Highly skilled at relationship building with clients and across organizations and teams. I have excellent writing, presenting, and interpersonal communication skills. I am confident that you will find my hands-on experience, qualifications and proficiencies make me an excellent candidate for the job. Thank you for your time and consideration. Looking forward to work with you. For any further details I can be contacted on skype via : arun_aartek Thanks

£38 GBP in 40 days

4.2

(1 review)

2.5

@eduff

I have more than a decade experience in Java, a strong familiarity with Bitcoin and experience with reactive/asynchronous programming.

£64 GBP in 40 days

0.0

(0 reviews)

0.0

@starjacky

Dear, Client. I have rich experience with token creation on ERC20, smart contract development using Solidity, web3js programming for DApps development. I believe that I can provide you with end-to-end service. Great communication skill with fluent English is my valuable trait. Thank you for taking the time to review my proposal and hope to work with you for a long time.

£30 GBP in 40 days