394 Backend Developer jobs in the United Kingdom

Backend Developer

Pendlebury, North West Earnly Limited

Posted today

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Job Description

full time

About Us

Earnly is a FinTech startup on a mission to simplify financial management and empower individuals and businesses with real-time clarity on their money. We’re developing a new platform that makes financial insights accessible, transparent, and stress-free. As an early member of our team, you’ll have the opportunity to directly shape the product, culture, and future of the company.

About You

You thrive in dynamic environments where no two days are the same, motivated by big goals and the satisfaction of building something meaningful from the ground up. Startups bring tight deadlines, shifting priorities, and lean resources, but you embrace the challenge, staying focused under pressure, taking ownership, adapting quickly, and pitching in wherever needed.

The Role

We’re looking for talented backend developer with proven commercial experience to help us build the core infrastructure that shall power our entire platform. You’ll be responsible for designing, developing, and maintaining secure, scalable APIs, data processing pipelines, and backend integrations with third-party services like Stripe, PayPal, and Open Banking providers.

Key Responsibilities:

  • Build and maintain robust RESTful APIs for mobile and web clients.
  • li>Design and manage databases built in MongoDB and SQL Server to store, query, and aggregate user financial data.
  • Develop data ingestion pipelines to process real-time and batch data from external services.
  • Optimize backend performance and ensure application scalability and resilience.
  • Build authentication and authorization flows, following best practices for fintech-grade security.
  • Write unit and integration tests, participate in code reviews, and contribute to continuous improvement.
  • Collaborate closely with frontend/mobile engineers, product managers, and founders in agile development cycles.
  • Contribute to infrastructure decisions (e.g. Docker, container orchestration, cloud services).

Skills & Experience You’ll Need

    < i>3+ years’ experience in backend development (ideally in a startup or SaaS environment). < i>Proficient in .Net, Core 8, Razor Pages and Bootstrap 5 for UI.
  • Experience with databases such as MongoDB and SQL Server, including schema design, indexing, and performance tuning.
  • Familiarity with cloud platforms like Azure (we use Azure).
  • Experience with containerization tools (Docker, Docker Compose) and deployment pipelines.
  • Strong understanding of API design, versioning, and security (OAuth, JWT, API tokens).
  • Comfortable working with Git, agile methodologies, and CI/CD practices.
  • A good understanding of data protection, GDPR, and fintech security requirements.

Nice to Have

  • Exposure to event-driven architecture or message queues (e.g. Kafka).
  • Experience integrating
This advertiser has chosen not to accept applicants from your region.

Backend Developer

EC1 London, London Randstad Technologies Recruitment

Posted today

Job Viewed

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Job Description

contract

Job Title:Software Engineer( Backend Developer)
Location:London
Contract: 6 Months with potential extension (Inside IR35)
Commute- Max 2 days in office
Payrate : 63 - 84 Per Hour Inside IR35

About the Role

We are seeking a Software Engineer (Backend Developer) for the FinTech business unit of a leading global digital travel platform. This role involves building innovative regulatory technology solutions to ensure compliance and manage risks. The engineer will work on a mission-critical platform that uses state-of-the-art technology for sanctions screening and other regulatory processes. The position requires developing highly scalable distributed systems and micro-services that support business objectives and enhance the experience for partners and internal stakeholders

What You'll Do

  • Design, build, and maintain scalable microservices that power our compliance platforms.
  • Develop tools and systems for sanctions screening, transaction monitoring, and regulatory reporting.
  • Optimize backend processes for performance, reliability, and data integrity.
  • Enhance tooling, analytics, and reporting used by internal compliance stakeholders.
  • Collaborate with cross-functional teams to understand regulatory processes and deliver technical solutions.
  • Participate in on-call rotations, incident resolution, and continuous improvement initiatives.
  • Contribute to hiring efforts and mentoring junior engineers.

What We're Looking For

  • 5+ years of experience in software development with at least 2 server-side languages - Java being must have
  • Proven experience with microservices architecture and scalable, distributed systems.
  • Proficient in data technologies like MySQL , Hadoop , or Cassandra .
  • Experience with batch processing , data pipelines , and data integrity practices.
  • Familiarity with AWS services (e.g., RDS, Step Functions, EC2, Kinesis) is a plus.
  • Solid understanding of unit , integration , and E2E testing paradigms.
  • Prior experience in FinTech, Financial sector, Banking or
This advertiser has chosen not to accept applicants from your region.

Backend Developer

Pendlebury, North West Earnly Limited

Posted today

Job Viewed

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Job Description

permanent, part time

About Us

Earnly is a FinTech startup on a mission to simplify financial management and empower individuals and businesses with real-time clarity on their money. We’re developing a new platform that makes financial insights accessible, transparent, and stress-free. As an early member of our team, you’ll have the opportunity to directly shape the product, culture, and future of the company.

About You

You thrive in dynamic environments where no two days are the same, motivated by big goals and the satisfaction of building something meaningful from the ground up. Startups bring tight deadlines, shifting priorities, and lean resources, but you embrace the challenge, staying focused under pressure, taking ownership, adapting quickly, and pitching in wherever needed.

The Role

We’re looking for talented backend developer with proven commercial experience to help us build the core infrastructure that shall power our entire platform. You’ll be responsible for designing, developing, and maintaining secure, scalable APIs, data processing pipelines, and backend integrations with third-party services like Stripe, PayPal, and Open Banking providers.

Key Responsibilities:

  • Build and maintain robust RESTful APIs for mobile and web clients.
  • li>Design and manage databases built in MongoDB and SQL Server to store, query, and aggregate user financial data.
  • Develop data ingestion pipelines to process real-time and batch data from external services.
  • Optimize backend performance and ensure application scalability and resilience.
  • Build authentication and authorization flows, following best practices for fintech-grade security.
  • Write unit and integration tests, participate in code reviews, and contribute to continuous improvement.
  • Collaborate closely with frontend/mobile engineers, product managers, and founders in agile development cycles.
  • Contribute to infrastructure decisions (e.g. Docker, container orchestration, cloud services).

Skills & Experience You’ll Need

    < i>3+ years’ experience in backend development (ideally in a startup or SaaS environment). < i>Proficient in .Net, Core 8, Razor Pages and Bootstrap 5 for UI.
  • Experience with databases such as MongoDB and SQL Server, including schema design, indexing, and performance tuning.
  • Familiarity with cloud platforms like Azure (we use Azure).
  • Experience with containerization tools (Docker, Docker Compose) and deployment pipelines.
  • Strong understanding of API design, versioning, and security (OAuth, JWT, API tokens).
  • Comfortable working with Git, agile methodologies, and CI/CD practices.
  • A good understanding of data protection, GDPR, and fintech security requirements.

Nice to Have

  • Exposure to event-driven architecture or message queues (e.g. Kafka).
  • Experience integrating
This advertiser has chosen not to accept applicants from your region.

Backend Developer

London, London £63 - £84 Hourly Randstad Technologies Recruitment

Posted today

Job Viewed

Tap Again To Close

Job Description

contract

Job Title:Software Engineer( Backend Developer)
Location:London
Contract: 6 Months with potential extension (Inside IR35)
Commute- Max 2 days in office
Payrate : 63 - 84 Per Hour Inside IR35

About the Role

We are seeking a Software Engineer (Backend Developer) for the FinTech business unit of a leading global digital travel platform. This role involves building innovative regulatory technology solutions to ensure compliance and manage risks. The engineer will work on a mission-critical platform that uses state-of-the-art technology for sanctions screening and other regulatory processes. The position requires developing highly scalable distributed systems and micro-services that support business objectives and enhance the experience for partners and internal stakeholders

What You'll Do

  • Design, build, and maintain scalable microservices that power our compliance platforms.
  • Develop tools and systems for sanctions screening, transaction monitoring, and regulatory reporting.
  • Optimize backend processes for performance, reliability, and data integrity.
  • Enhance tooling, analytics, and reporting used by internal compliance stakeholders.
  • Collaborate with cross-functional teams to understand regulatory processes and deliver technical solutions.
  • Participate in on-call rotations, incident resolution, and continuous improvement initiatives.
  • Contribute to hiring efforts and mentoring junior engineers.

What We're Looking For

  • 5+ years of experience in software development with at least 2 server-side languages - Java being must have
  • Proven experience with microservices architecture and scalable, distributed systems.
  • Proficient in data technologies like MySQL , Hadoop , or Cassandra .
  • Experience with batch processing , data pipelines , and data integrity practices.
  • Familiarity with AWS services (e.g., RDS, Step Functions, EC2, Kinesis) is a plus.
  • Solid understanding of unit , integration , and E2E testing paradigms.
  • Prior experience in FinTech, Financial sector, Banking or
This advertiser has chosen not to accept applicants from your region.

Java Backend Developer

EC1 London, London Randstad Technologies Recruitment

Posted today

Job Viewed

Tap Again To Close

Job Description

contract

Job Title:Software Engineer( Backend Developer)
Location:London
Contract: 6 Months with potential extension (Inside IR35)
Commute- Max 2 days in office
Payrate : 63 - 84 Per Hour Inside IR35

About the Role

We are seeking a Java Backend Developer for the FinTech business unit of a leading global digital travel platform.
If you are a Java Backend Developer with 5 to 12 years of experience then this opportunity is for you.

This role involves building innovative regulatory technology solutions to ensure compliance and manage risks. The engineer will work on a mission-critical platform that uses state-of-the-art technology for sanctions screening and other regulatory processes. The position requires developing highly scalable distributed systems and micro-services that support business objectives and enhance the experience for partners and internal stakeholders

What You'll Do

  • Design, build, and maintain scalable microservices that power our compliance platforms.
  • Develop tools and systems for sanctions screening, transaction monitoring, and regulatory reporting.
  • Optimize backend processes for performance, reliability, and data integrity.
  • Enhance tooling, analytics, and reporting used by internal compliance stakeholders.
  • Collaborate with cross-functional teams to understand regulatory processes and deliver technical solutions.
  • Participate in on-call rotations, incident resolution, and continuous improvement initiatives.
  • Contribute to hiring efforts and mentoring junior engineers.

What We're Looking For

  • 5- 12 years of experience (not more than 12 years) in software development with at least 2 server-side languages - Java being must have.
  • Experience working in Kubernetes environment.
  • Proven experience with microservices architecture and scalable, distributed systems.
  • Proficient in data technologies like MySQL .
  • Experience with batch processing , data pipelines , and data integrity practices.
  • Familiarity with AWS services (e.g., RDS, Step Functions, EC2, Kinesis) is a plus.
  • Solid understanding of unit , integration , and E2E testing paradigms.
  • Prior experience in FinTech, Financial sector, Banking or
This advertiser has chosen not to accept applicants from your region.

Senior Backend Developer

Canary Wharf, London Capital Pay Software Solutions Ltd

Posted today

Job Viewed

Tap Again To Close

Job Description

full time

Senior Backend Developer

Capital Pay Software Solutions Ltd

  • Promoting world class
This advertiser has chosen not to accept applicants from your region.

Senior Backend Developer

M1 Ancoats, North West The Portfolio Group

Posted today

Job Viewed

Tap Again To Close

Job Description

full time

The Opportunity

We're looking for a talented Senior Backend Developer to join a purpose-driven tech team that creates solutions making a real difference in people's lives. This is more than just a job, it's a chance to shape systems that support individuals and organisations across the UK and Ireland.

The Role

As a Senior Backend Developer, you'll be a founding member of a newly formed cross-functional engineering team. You'll play a key role in setting the tone for the team's culture, practices, and success. Your technical expertise will shape our architecture and support business-critical applications.

This is a highly collaborative role suited to someone with a passion for software craftsmanship and continuous improvement.

Key Responsibilities

  • Enhance features and functionality of core products
  • Design and implement scalable backend systems using C# (.NET 5+ preferred)
  • Write clean, maintainable, and testable code using TDD/BDD principles
  • Create and maintain RESTful and GraphQL APIs
  • Collaborate with POs, BAs, and stakeholders to define solutions
  • Mentor junior developers and promote best practices
  • Drive improvements in development processes and tools

What You Bring

  • 5+ years of backend development experience
  • Expertise in C#, .NET (preferably .NET 6+), and SQL Server
  • Deep understanding of SOLID and OOP principles
  • Skilled in Git, Unit Testing (NUnit), and API development
  • Familiarity with CI/CD pipelines and agile methodologies
  • Strong communication and problem-solving skills
  • Desire to grow within a dynamic and evolving team

Why Join?

This is an incredible opportunity to make your mark in a company that prioritises purpose, innovation, and professional growth. You'll be part of a team where your ideas are welcomed, your development is encouraged, and your work truly matters.

Ready to build something that helps others-and builds your career in the process? Apply today.

48954MS

INDMANS

This advertiser has chosen not to accept applicants from your region.
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Senior Backend Developer

EC1 London, London SThree Management Services

Posted today

Job Viewed

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Job Description

full time

SThree are pleased to announce we're recruiting for a talented Senior Java Backend Developer to join & guide our excellent team based in our fantastic office space located in 8 Bishopsgate, London.

SThree are building a new candidate digital experience to manage the interactions that candidates and contractors have with SThree. The first part of this journey is to build a contractor onboarding portal to streamline the process from a candidate placement to onboarded contractor. This will then be extended to provide functionality to manage active placements, such as timesheets and expenses.

This role will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team.

About us

SThree is the global STEM-specialist talent partner that connects sought-after specialists in life sciences, technology, engineering and mathematics with innovative organisations across the world. We are the number one destination for talent in the best STEM markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future.

What are the day-to-day tasks?

  • Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines.
  • Work with business stakeholders to understand opportunities and to design solutions that deliver the required outcomes.
  • Work with other technology teams to design and deliver end-to-end capabilities.
  • Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems.
  • Provide support to users and resolve systems issues.
  • Configure CICD pipelines to support continuous delivery.
  • Maintain infrastructure-as-code to build environments and applications.
  • Focus on automation across infrastructure, testing, deployment, operations, and security.
  • Coach and mentor junior team members and promote knowledge sharing and collaboration across the team.

What skills and knowledge are we looking for?

  • Extensive experience of building web applications on a Java technology stack.
  • Experience of RESTful API design and implementation.
  • Experience with test-driven development and test automation frameworks and tools.
  • Experience of configuring CICD pipelines to support continuous delivery.
  • Experience with infrastructure-as-code technologies such as Terraform.
  • Experience of working in Agile software development teams and across the full software development lifecycle.
  • Previous experience of building solutions using Liferay DXP would be beneficial.
  • Good understanding of Azure Integration Services (API Management, Service Bus, Event Hub).
  • Good understanding of Microsoft Identity Management solutions (Azure AD, Azure AD B2C).
  • Good understanding of cloud computing architectures and fundamentals like security, performance, and scalability, with experience of working with cloud technologies in Azure.

Benefits for our U.K. teams include:

  • The choice to work flexibly from home and the office, in line with our hybrid working principles
  • Bonus linked to company and personal performance
  • Generous 28 days holiday allowance, plus public holidays
  • Annual leave purchase scheme
  • Five days paid Caregiver/Dependant leave per annum
  • Five paid days off per year for volunteering `
  • Private healthcare, discounted dental insurance and health care cashback scheme
  • Opportunity to participate in the company share scheme
  • Access to a range of retail discounts and saving

What we stand for.

We're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable, and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected. If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

What we stand for.

We create community and deliver change that transforms the future for everyone. With this in mind, we're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected.

If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

This advertiser has chosen not to accept applicants from your region.

Senior Backend Developer

Greater London, London Liberty CL Recruitment

Posted today

Job Viewed

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Job Description

full time

The Liberty Recruitment Group is excited to be working in partnership with a leading Tech-enabled Analytics Consultancy based in London, who are looking for a Senior Backend Developer to join their award-winning Insurance division.

As part of a mixed technical team including back-end developers, testers, front-end developers and actuarial data scientists, you’d be working on their market-leading insurance application, used by some of the largest London Market and International insurers to assess over £200bn in reserves.

Your key focus will be:

  • Leading the design and development of new product features, providing a holistic approach to design
  • li>Driving better integration between their C# and Python codebases, rewriting and restructuring code where needed to improve cohesion
  • Address any performance bottlenecks and optimise performance of complex data workflows
  • li>Championing best practice and guiding the junior team members

What they’re specifically looking for:

    < i>C# development experience (.Net 8) with production-level proficiency
  • Data engineering – data-intensive application experience
  • < i>Python
  • Azure PaaS / SaaS tools (eg. Azure Functions, App Services, Batch, Blob/Table/Queue Storage)
  • Excellent problem-solving skills

Why join them:

It’s an entrepreneurial environment pushing the boundaries, harnessing technology to enable more efficient analytics. A true people-first employer where you’ll be supported to learn and develop your skills in a collaborative, innovative environment. Hybrid working (2 days a week in their London office), discretionary bonus, enhanced pension, private medical insurance, superb wellbeing services and much more.

This advertiser has chosen not to accept applicants from your region.

Senior Backend Developer

London, London SThree Management Services

Posted today

Job Viewed

Tap Again To Close

Job Description

permanent

SThree are pleased to announce we're recruiting for a talented Senior Java Backend Developer to join & guide our excellent team based in our fantastic office space located in 8 Bishopsgate, London.

SThree are building a new candidate digital experience to manage the interactions that candidates and contractors have with SThree. The first part of this journey is to build a contractor onboarding portal to streamline the process from a candidate placement to onboarded contractor. This will then be extended to provide functionality to manage active placements, such as timesheets and expenses.

This role will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team.

About us

SThree is the global STEM-specialist talent partner that connects sought-after specialists in life sciences, technology, engineering and mathematics with innovative organisations across the world. We are the number one destination for talent in the best STEM markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future.

What are the day-to-day tasks?

  • Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines.
  • Work with business stakeholders to understand opportunities and to design solutions that deliver the required outcomes.
  • Work with other technology teams to design and deliver end-to-end capabilities.
  • Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems.
  • Provide support to users and resolve systems issues.
  • Configure CICD pipelines to support continuous delivery.
  • Maintain infrastructure-as-code to build environments and applications.
  • Focus on automation across infrastructure, testing, deployment, operations, and security.
  • Coach and mentor junior team members and promote knowledge sharing and collaboration across the team.

What skills and knowledge are we looking for?

  • Extensive experience of building web applications on a Java technology stack.
  • Experience of RESTful API design and implementation.
  • Experience with test-driven development and test automation frameworks and tools.
  • Experience of configuring CICD pipelines to support continuous delivery.
  • Experience with infrastructure-as-code technologies such as Terraform.
  • Experience of working in Agile software development teams and across the full software development lifecycle.
  • Previous experience of building solutions using Liferay DXP would be beneficial.
  • Good understanding of Azure Integration Services (API Management, Service Bus, Event Hub).
  • Good understanding of Microsoft Identity Management solutions (Azure AD, Azure AD B2C).
  • Good understanding of cloud computing architectures and fundamentals like security, performance, and scalability, with experience of working with cloud technologies in Azure.

Benefits for our U.K. teams include:

  • The choice to work flexibly from home and the office, in line with our hybrid working principles
  • Bonus linked to company and personal performance
  • Generous 28 days holiday allowance, plus public holidays
  • Annual leave purchase scheme
  • Five days paid Caregiver/Dependant leave per annum
  • Five paid days off per year for volunteering `
  • Private healthcare, discounted dental insurance and health care cashback scheme
  • Opportunity to participate in the company share scheme
  • Access to a range of retail discounts and saving

What we stand for.

We're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable, and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected. If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

What we stand for.

We create community and deliver change that transforms the future for everyone. With this in mind, we're committed to ensuring for our colleagues, candidates and communities, that all processes are equitable and everyone is treated with fairness and dignity where everyone belongs, is valued and is connected.

If you need any assistance or reasonable adjustments in submitting your application, please let us know, and we'll be happy to help.

This advertiser has chosen not to accept applicants from your region.
 

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