3,123 Kotlin Java jobs in the United Kingdom

Job Title: Web Solutions Engineer/Full Stack Engineer

Location: Address: 1-13 St Giles High St, London WC2H 8AG

Mode of working: Hybrid (3 Days in the Office)

Duration: 6+ Months contract initially

Job description:

As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications.

Top Responsibilities:

• Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL
• Test, debug, maintain and/or update full-stack web applications.
• Write and review technical documents, including design, development, and revision documents.
• Collaborate with Product, UX, QA, and engineering teams, to deliver new features

Mandatory Skills/Qualifications:

• 3+ years experience writing JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL
• 3+ years experience developing resource oriented APIs
• 3+ years experience designing and debugging databases
• Experience in multiple general purpose programming languages and building large, scaled full stack web solutions.
• Microservice design and implementation

Job Title: Web Solutions Engineer/Full Stack Engineer

Location: Address: 1-13 St Giles High St, London WC2H 8AG

Mode of working: Hybrid (3 Days in the Office)

Duration: 6+ Months contract initially

Job description:

As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications.

Top Responsibilities:

• Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL
• Test, debug, maintain and/or update full-stack web applications.
• Write and review technical documents, including design, development, and revision documents.
• Collaborate with Product, UX, QA, and engineering teams, to deliver new features

Mandatory Skills/Qualifications:

• 3+ years experience writing JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL
• 3+ years experience developing resource oriented APIs
• 3+ years experience designing and debugging databases
• Experience in multiple general purpose programming languages and building large, scaled full stack web solutions.
• Microservice design and implementation

Senior Software Engineer - Java/Kotlin - Equity Derivatives - VP
We are seeking a senior developer to join the London based team part of the Equity Derivatives Pre-Trade technology group. This role will position you as a technical and delivery lead to help to design and deliver the build out of a pre-trade request-for-quote and pricing platform used by the Equity Derivatives and Delta 1 desks globally. This is also an excellent opportunity for you to define yourself as a key contributor and technical lead within the wider Equity technology division.
On a daily basis you will be working with tech as well as front office sales, trading, and quants colleagues across all Derivative & Delta 1 desks.
**Responsibilities:**
+ Deliver consistently excellent code, adhering to our team standards and industry best practices.
+ Identify and define necessary system enhancements to deploy new products and process improvements.
+ Partner with multiple related teams to ensure business critical goals are met efficiently and within agreed timescales.
+ Resolve a variety of high impact problems/projects through in-depth evaluation of complex business processes.
+ Achieve and maintain a high level of understanding and current system processes and industry standards.
+ Develop comprehensive knowledge of relevant areas of business and understand their goals and long-term strategy.
+ Serve as advisor or coach to mid-level developers and analysts, operating within an agile / frequent delivery mindset.
+ Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behaviour, conduct and business practices, and escalating, managing and reporting control issues with transparency.
**Required Qualifications:**
+ Experience as a technical lead senior developer.
+ Extensive experience of system analysis and development of production-quality software applications.
+ Consistently clear and concise written and verbal communication.
+ Experience working on microservices systems and container/cloud deployment and hosting designs.
+ Understanding of financial instruments, ideally Equity Derivatives and Delta 1 asset classes.
+ Proficient in multi-threading and parallel task programming.
+ Proven experience in ensuring robust testing quality practice and maintaining clean CI/CD pipelines.
**Preferred Qualifications:**
+ Experience working in Kotlin, Kafka, ELK.
+ Experience leveraging LLMs assistant tools rationally for coding
+ Understanding of trade booking and life cycle processes
+ Knowledge of Mifid II, Dodd Frank regulations and controls
+ Knowledge/experience of FIX flows - TradeWeb, RFQ Hub, BlackRock and Bloomberg, RFQ Workflows.
+ Additional technology experience: React JS, Apache NiFi, Mongo, DBaaS, SaaS, Tibco/Solace or similar messaging middleware
**Education:**
+ Bachelor's degree or equivalent experience operating in a similar role
This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.
**What we'll provide you**
By joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:
+ 27 days annual leave (plus bank holidays)
+ A discretional annual performance related bonus
+ Private Medical Care & Life Insurance
+ Employee Assistance Program
+ Pension Plan
+ Paid Parental Leave
+ Special discounts for employees, family, and friends
+ Access to an array of learning and development resources
Visit our Global Benefits page to learn more. ( these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.
#LI-AP2
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**Job Family Group:**
Technology
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**Job Family:**
Applications Development
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**Time Type:**
Full time
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**Most Relevant Skills**
Please see the requirements listed above.
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**Other Relevant Skills**
For complementary skills, please see above and/or contact the recruiter.
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_Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law._
_If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review_ _Accessibility at Citi ( _._
_View Citi's_ _EEO Policy Statement ( _and the_ _Know Your Rights ( _poster._
Citi is an equal opportunity and affirmative action employer.
Minority/Female/Veteran/Individuals with Disabilities/Sexual Orientation/Gender Identity.

Overview

Senior Software Engineer - Java/Kotlin - Equity Derivatives – VP. We are seeking a senior developer to join the London based team part of the Equity Derivatives Pre-Trade technology group. This role will position you as a technical and delivery lead to help design and deliver the build out of a pre-trade request-for-quote and pricing platform used by the Equity Derivatives and Delta 1 desks globally. This is also an excellent opportunity for you to define yourself as a key contributor and technical lead within the wider Equity technology division. On a daily basis you will be working with tech as well as front office sales, trading, and quants colleagues across all Derivative & Delta 1 desks.

Responsibilities

Deliver consistently excellent code, adhering to our team standards and industry best practices.

Identify and define necessary system enhancements to deploy new products and process improvements.

Partner with multiple related teams to ensure business critical goals are met efficiently and within agreed timescales.

Resolve a variety of high impact problems/projects through in-depth evaluation of complex business processes.

Achieve and maintain a high level of understanding and current system processes and industry standards.

Develop comprehensive knowledge of relevant areas of business and understand their goals and long-term strategy.

Serve as advisor or coach to mid-level developers and analysts, operating within an agile / frequent delivery mindset.

Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behaviour, conduct and business practices, and escalating, managing and reporting control issues with transparency.

Required Qualifications

Experience as a technical lead senior developer.

Extensive experience of system analysis and development of production-quality software applications.

Consistently clear and concise written and verbal communication.

Experience working on microservices systems and container/cloud deployment and hosting designs.

Understanding of financial instruments, ideally Equity Derivatives and Delta 1 asset classes.

Proficient in multi-threading and parallel task programming.

Proven experience in ensuring robust testing quality practice and maintaining clean CI/CD pipelines.

Preferred Qualifications

Experience working in Kotlin, Kafka, ELK.

Experience leveraging LLMs assistant tools rationally for coding.

Understanding of trade booking and life cycle processes.

Knowledge of MiFID II, Dodd-Frank regulations and controls.

Knowledge/experience of FIX flows - TradeWeb, RFQ Hub, BlackRock and Bloomberg, RFQ Workflows.

Additional technology experience: React JS, Apache NiFi, Mongo, DBaaS, SaaS, Tibco/Solace or similar messaging middleware.

Education

Bachelor’s degree or equivalent experience operating in a similar role

This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.

What we’ll provide younBy joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:

27 days annual leave (plus bank holidays)

A discretionary annual performance related bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Special discounts for employees, family, and friends

Access to an array of learning and development resources

Accessibility and Equal Employment Opportunity information: Citi is an equal opportunity employer. If you require a reasonable accommodation to use our tools or apply, please review Citi guidelines. View Citi’s EEO Policy Statement and Know Your Rights poster.

#LI-AP2

#J-18808-Ljbffrn

Senior Software Engineer - Java/Kotlin - Equity Derivatives – VP

We are seeking a senior developer to join the London based team part of the Equity Derivatives Pre-Trade technology group. This role will position you as a technical and delivery lead to help to design and deliver the build out of a pre-trade request-for-quote and pricing platform used by the Equity Derivatives and Delta 1 desks globally. This is also an excellent opportunity for you to define yourself as a key contributor and technical lead within the wider Equity technology division.nOn a daily basis you will be working with tech as well as front office sales, trading, and quants colleagues across all Derivative & Delta 1 desks.nResponsibilities

Deliver consistently excellent code, adhering to our team standards and industry best practices.nIdentify and define necessary system enhancements to deploy new products and process improvements.nPartner with multiple related teams to ensure business critical goals are met efficiently and within agreed timescales.nResolve a variety of high impact problems/projects through in-depth evaluation of complex business processes.nAchieve and maintain a high level of understanding and current system processes and industry standards.nDevelop comprehensive knowledge of relevant areas of business and understand their goals and long-term strategy.nServe as advisor or coach to mid-level developers and analysts, operating within an agile / frequent delivery mindset.nAppropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citi, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behaviour, conduct and business practices, and escalating, managing and reporting control issues with transparency.nRequired Qualifications

Experience as a technical lead senior developer.nExtensive experience of system analysis and development of production-quality software applications.nConsistently clear and concise written and verbal communication.nExperience working on microservices systems and container/cloud deployment and hosting designs.nUnderstanding of financial instruments, ideally Equity Derivatives and Delta 1 asset classes.nProficient in multi-threading and parallel task programming.nProven experience in ensuring robust testing quality practice and maintaining clean CI/CD pipelines.nPreferred Qualifications

Experience working in Kotlin, Kafka, ELK.nExperience leveraging LLMs assistant tools rationally for codingnUnderstanding of trade booking and life cycle processesnKnowledge of Mifid II, Dodd Frank regulations and controlsnKnowledge/experience of FIX flows - TradeWeb, RFQ Hub, BlackRock and Bloomberg, RFQ Workflows.nAdditional technology experience: React JS, Apache NiFi, Mongo, DBaaS, SaaS, Tibco/Solace or similar messaging middlewarenEducation

Bachelor’s degree or equivalent experience operating in a similar rolenThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.nWhat we’ll provide you

By joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:n27 days annual leave (plus bank holidays)nA discretionary annual performance related bonusnPrivate Medical Care & Life InsurancenEmployee Assistance ProgramnPension PlannPaid Parental LeavenSpecial discounts for employees, family, and friendsnAccess to an array of learning and development resourcesnEqual opportunity: Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

#J-18808-Ljbffrn

IntroductionnIn this role, you will have the autonomy to choose the right tool for the job and introduce emerging technologies.nTechnologies:

APInAWSnBackendnJavanJavaScriptnKotlinnPostgreSQLnPythonnReactnSQLnWebnCloudnMore:

As a hybrid WFH Backend Software Engineer/Developer (Java Kotlin AWS), I will be working on a Tech. Salary: £75,000 - 90,000 per yearnRequirements:

Strong Java and Kotlin serverside development experiencenGood knowledge of AWSnExperience of technically leading projects and mentoring othersnGood knowledge of SQL, PostgreSQL ideallynCollaborative and keen to.

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Overview

Prime Brokerage Technology provides solutions that underpin the operations of our clients and traders, forming the foundation of Citi’s Prime Finance business. This is an area of great opportunity and a major growth target for Citi, with technology providing the key to unlock this potential. This is an excellent opportunity for the right candidate to join Citi at this exciting time.nResponsibilities

Ownership and delivery on a variety of components (Java/Kotlin) within the Core Prime Brokerage platform. Hands-on development.nProvide technical leadership for an agile development team, championing best practices in continuous integration and continuous deployment (CI/CD). Foster a culture of quality through automated testing initiatives. Drive continuous improvement in SDLC, agile and DevOps processes using key performance indicators, including DORA metrics, to enhance team efficiency and software delivery.nLead design, planning and estimation discussions within the team and with partners across the department and with business stakeholders.nConduct high-level system analysis and architecture design, ensuring alignment with business requirements, technical standards and the overall architecture blueprint.nFacilitate requirement gathering and translate complex business needs into technical specifications.nOversee the creation and maintenance of project and technical documentation.nIdentify and mitigate risks throughout the SDLC, proposing solutions to complex problems.nUtilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation.nOversee production support processes, collaborating with operations and business stakeholders. Analyze issue patterns to drive improvements. Guide documentation efforts, maintain on-call rotations and lead post-mortems. Lead efforts to resolve root causes and enhance performance, scalability, and reliability.nProvide technical leadership and serve as advisor or coach to mid-level developers, analysts and grads.nTechnical Experience

Java & Test-Driven Development are essential.nExperience in additional technologies is advantageous, including: Kotlin, Java, Kafka Streams.nCloud technologies (Kubernetes, OpenShift).nMessaging technologies (Kafka, Solace, TIBCO).nDatabase / data store / data query technologies (SQL Server, Trino, Mongo, S3).nObservability technologies (OpenTelemetry, Elastic Stack / ELK, Grafana).nWhat we need from you

Extensive relevant experience in applications development or systems analysis role.nExtensive experience in system analysis and in programming of software applications.nExperience in managing and implementing successful projects.nSubject matter expert (SME) in at least one area of applications development.nAbility to adjust priorities quickly as circumstances dictate.nDemonstrated leadership and project management skills.nClear and concise written and verbal communication.nBachelor’s degree or equivalent experience; Master’s degree preferred.nThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.nEEO and Accessibility

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity, please review the Citi Accessibility information.

#J-18808-Ljbffrn

Overview

Prime Brokerage Technology provides solutions that underpin the operations of our clients and traders that provide the foundation of our Prime Finance business. This is an area of great opportunity and is a major growth target for Citi – with technology providing the key to unlock this potential. This is an excellent opportunity for the right candidate to join Citi at this exciting time.nResponsibilities

Ownership and delivery on a variety of components (Java/Kotlin) within the Core Prime Brokerage platform. Hands-on development.nProvide technical leadership for an agile development team, championing best practices in Continuous Integration and Continuous Deployment (CI/CD). Foster a culture of quality through developer-led automated testing initiatives. Drive continuous improvement in SDLC, agile and DevOps processes using key performance indicators, including DORA metrics, to enhance team efficiency and software delivery.nLead design, planning and estimation discussions within the team and with partners from across the department along with business stakeholders.nConduct high-level system analysis and architecture design, ensuring alignment with business requirements, technical standards and the overall architecture blueprint.nFacilitate requirement gathering and translate complex business needs into technical specifications.nOversee the creation and maintenance of project and technical documentation.nIdentify and mitigate risks throughout the SDLC, proposing solutions to complex problems.nUtilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation.nOversee production support processes, collaborating with operations and business stakeholders. Analyze issue patterns to drive improvements. Guide documentation efforts, maintain on-call rotations and lead post-mortems. Lead efforts to resolve root-causes and enhance performance, scalability, and reliability.nProvide technical leadership and serve as advisor or coach to mid-level developers, analysts and grads.nTechnical Experience

Java & Test-Driven Development are essential.nExperience in additional technologies (advantageous)

Kotlin, Java, Kafka StreamsnCloud Technologies (Kubernetes, Open Shift)nMessaging Technologies (Kafka, Solace, TIBCO)nDatabase / Data Store / Data Query Technologies (SQL Server, Trino, Mongo, S3)nObservability Technologies (OpenTelemetry, Elastic Stack / ELK, Grafana)nWhat we need from you

Extensive relevant experience in Apps Development or systems analysis rolenExtensive experience in system analysis and in programming of software applicationsnExperience in managing and implementing successful projectsnSubject Matter Expert (SME) in at least one area of Applications DevelopmentnAbility to adjust priorities quickly as circumstances dictatenDemonstrated leadership and project management skillsnConsistently demonstrates clear and concise written and verbal communicationnBachelor’s degree/University degree or equivalent experiencenMaster’s degree preferrednThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.nRole Details

Job Family Group:

TechnologynJob Family:

Applications DevelopmentnTime Type:

Full timenOther Details

Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.nIf you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.

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Senior Java / Kotlin Engineer (TDD) - Prime Brokerage Tech (VP)

Prime Brokerage Technology provides solutions that underpin the operations of our clients and traders that provide the foundation of our Prime Finance business. This is an area of great opportunity and is a major growth target for Citi – with technology providing the key to unlock this potential. This is an excellent opportunity for the right candidate to join Citi at this exciting time.nResponsibilities

Ownership and delivery on a variety of components (Java/Kotlin) within the Core Prime Brokerage platform. Hands-on development.nProvide technical leadership for an agile development team, championing best practices in CI/CD. Foster a culture of quality through developer-led automated testing initiatives. Drive continuous improvement in SDLC, agile and DevOps processes using key performance indicators, including DORA metrics, to enhance team efficiency and software delivery.nLead design, planning and estimation discussions within the team and with partners from across the department along with business stakeholders.nConduct high-level system analysis and architecture design, ensuring alignment with business requirements, technical standards and the overall architecture blueprint.nFacilitate requirement gathering and translate complex business needs into technical specifications.nOversee the creation and maintenance of project and technical documentation.nIdentify and mitigate risks throughout the SDLC, proposing solutions to complex problems.nUtilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation.nOversee production support processes, collaborating with operations and business stakeholders. Analyze issue patterns to drive improvements. Guide documentation efforts, maintain on-call rotations and lead post-mortems. Lead efforts to resolve root-causes and enhance performance, scalability, and reliability.nProvide technical leadership and serve as advisor or coach to mid-level developers, analysts and grads.nTechnical Experience

Java & Test-Driven Development are essential.nKotlin, Java, Kafka StreamsnCloud Technologies (Kubernetes, Open Shift)nMessaging Technologies (Kafka, Solace, TIBCO)nDatabase / Data Store / Data Query Technologies (SQL Server, Trino, Mongo, S3)nObservability Technologies (OpenTelemetry, Elastic Stack / ELK, Grafana)nWhat we need from you

Extensive relevant experience in Apps Development or systems analysis rolenExtensive experience in system analysis and in programming of software applicationsnExperience in managing and implementing successful projectsnSubject Matter Expert (SME) in at least one area of Applications DevelopmentnAbility to adjust priorities quickly as circumstances dictatenDemonstrated leadership and project management skillsnConsistently demonstrates clear and concise written and verbal communicationnBachelor’s degree/University degree or equivalent experiencenMaster’s degree preferrednThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.nCiti is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity, Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.

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