Date posted
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Locations
Locations
Salaries
Date posted
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23 Contract API jobs in Southwark (SE1) + 20 miles
179 exact matches jobs are outside your preferred location
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*outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
*outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
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*outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
*outside iR35* What You'll Be Doing * Designing and developing enterprise-grade solutions in an Agile team. * Building and maintaining middleware services using C#, REST APIs, FIX messaging, XML, and Microservices. * Leading architecture discussions, code reviews, and release management. * Collaborating with users and cross-functional teams to define and execute testing strategies. * Mentoring junior developers and contributing to internal best practices. What You Bring * A strong academic background in Computer Science, Engineering, or a related field. * Proven experience in commodities trading, especially with derivatives and platforms like ICE, CME, NASDAQ, Trayport, or TT. * Deep knowledge of C# .NET, RESTful services, and microservice architecture. * Hands-on experience with FIX messaging, XML, AMQ, and ideally nHibernate, OData, and TDD.
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Lead Salesforce Developer Contract (Outside IR35) Fully Remote - Day Rate: Competitive, open to negotiation - Duration: 6 months+ Working Arrangements: Fully Remote - Interview: 1 Video Call - About the Role - We are seeking an experienced Lead Salesforce Developer for a hands-on leadership role within a fast-growing, innovative financial services environment. You will take ownership of the Salesforce platform, leading a small, talented team and driving technical excellence across the business. What Youll Do * Lead the design, development, and deployment of Salesforce solutions * Collaborate with stakeholders to gather requirements and deliver tailored functionality * Manage and mentor a team of Salesforce professionals (Administrators, Analysts, and Developers) * Ensure data integrity, oversee integrations, and manage complex data models
Lead Salesforce Developer Contract (Outside IR35) Fully Remote - Day Rate: Competitive, open to negotiation - Duration: 6 months+ Working Arrangements: Fully Remote - Interview: 1 Video Call - About the Role - We are seeking an experienced Lead Salesforce Developer for a hands-on leadership role within a fast-growing, innovative financial services environment. You will take ownership of the Salesforce platform, leading a small, talented team and driving technical excellence across the business. What Youll Do * Lead the design, development, and deployment of Salesforce solutions * Collaborate with stakeholders to gather requirements and deliver tailored functionality * Manage and mentor a team of Salesforce professionals (Administrators, Analysts, and Developers) * Ensure data integrity, oversee integrations, and manage complex data models
Knowledge of Microsoft licensing, environment strategies, and API limitations.
Knowledge of Microsoft licensing, environment strategies, and API limitations.
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REST API development
REST API development
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Experience in using API testing tools like Postman, Insomnia
Experience in using API testing tools like Postman, Insomnia
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4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
4+ years automation testing skills (Selenium, Katalon, GT-UI, GT-API). * Web services testing / API testing skills is a plus.
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We are seeking an AI Engineer with experience in Large Language API's (from 2021), Generative AI and Python, to play a pivotal role in shaping and enhancing AI products for Government. - Maintain and iterate a web API using FastAPI, hosted on Amazon Web Services (AWS).
We are seeking an AI Engineer with experience in Large Language API's (from 2021), Generative AI and Python, to play a pivotal role in shaping and enhancing AI products for Government. - Maintain and iterate a web API using FastAPI, hosted on Amazon Web Services (AWS).
As our API Integration Specialist, you will support and help to grow our brand universe. * Around 2-3 years in API integration domain
As our API Integration Specialist, you will support and help to grow our brand universe. * Around 2-3 years in API integration domain
Work closely with the team to develop new features, such as better interpretation layers, enhanced data decoding, and improved API coverage for various blockchain data.
Work closely with the team to develop new features, such as better interpretation layers, enhanced data decoding, and improved API coverage for various blockchain data.
As an emerging leader in the $10B+ communications API market, we empower global brands to connect better with their customers, employees, and partners through transformative communications experiences. For example, Vonage API solutions empower organizations to build their custom omnichannel communications structure. This role is critical to protecting our customers and their end users from increasingly sophisticated fraud schemes and prevent bad actors from using our services while maintaining seamless user experiences across all Vonage communication API channels including voice & messaging channels..
As an emerging leader in the $10B+ communications API market, we empower global brands to connect better with their customers, employees, and partners through transformative communications experiences. For example, Vonage API solutions empower organizations to build their custom omnichannel communications structure. This role is critical to protecting our customers and their end users from increasingly sophisticated fraud schemes and prevent bad actors from using our services while maintaining seamless user experiences across all Vonage communication API channels including voice & messaging channels..
You may also be asked to support the testing of releases for our Client API and Mobile Application. * API testing - building out automated test coverage of our RESTful Client API * Collaborate with the external contractor QA resource on specific projects (e.g. automating API testing) and as an additional resource when required
You may also be asked to support the testing of releases for our Client API and Mobile Application. * API testing - building out automated test coverage of our RESTful Client API * Collaborate with the external contractor QA resource on specific projects (e.g. automating API testing) and as an additional resource when required
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Deep understanding of AWS services such as Lambda, DynamoDB, S3, API Gateway and CloudFormation
Deep understanding of AWS services such as Lambda, DynamoDB, S3, API Gateway and CloudFormation
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Wallarm is the only solution that unifies best-in-class API Security and WAAP (Next-Gen WAF) capabilities to protect your entire API and web application portfolio in multi-cloud and cloud-native environments. * Recommend API security best practices, application architectures, platforms and application infrastructure required to successfully implement a complete API security solution based on Wallarm - Prior experience in API security, API management, SIEM, Software Development, DevOps, DevSecOps, or web application firewalls is preferred
Wallarm is the only solution that unifies best-in-class API Security and WAAP (Next-Gen WAF) capabilities to protect your entire API and web application portfolio in multi-cloud and cloud-native environments. * Recommend API security best practices, application architectures, platforms and application infrastructure required to successfully implement a complete API security solution based on Wallarm - Prior experience in API security, API management, SIEM, Software Development, DevOps, DevSecOps, or web application firewalls is preferred
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Own end-to-end API and IDoc integration strategy and execution through go-live.
Own end-to-end API and IDoc integration strategy and execution through go-live.
London/Hybrid - Slalom is a global, human-centric business and technology consulting firm. We specialise in partnering with organisations that aspire to excellence, helping them tackle complex challenges and achieve transformative results through strategy, technology, and business transformation services. By prioritising people, Slalom creates a unique consulting experience, with a team of strategists and engineers delivering practical, end-to-end solutions that drive impactful outcomes for our clients. We empower people and organisations to dream bigger, move faster, and build better tomorrows for all. Our Software Engineering team builds the core applications and services that power our products and deliver value to users around the world. We focus on creating scalable, secure, and high-performance systems that enable rapid innovation and seamless user experiences.
London/Hybrid - Slalom is a global, human-centric business and technology consulting firm. We specialise in partnering with organisations that aspire to excellence, helping them tackle complex challenges and achieve transformative results through strategy, technology, and business transformation services. By prioritising people, Slalom creates a unique consulting experience, with a team of strategists and engineers delivering practical, end-to-end solutions that drive impactful outcomes for our clients. We empower people and organisations to dream bigger, move faster, and build better tomorrows for all. Our Software Engineering team builds the core applications and services that power our products and deliver value to users around the world. We focus on creating scalable, secure, and high-performance systems that enable rapid innovation and seamless user experiences.
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Support customers in achieving effective and efficient SDK and API integrations with Braze
Support customers in achieving effective and efficient SDK and API integrations with Braze
Skilled in designing and building REST APIs and understanding REST API architecture
Skilled in designing and building REST APIs and understanding REST API architecture
SharePoint CSOM API
SharePoint CSOM API
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Responsible for configuration and testing of API and Webservices based integrations and develop customisations where required.
Responsible for configuration and testing of API and Webservices based integrations and develop customisations where required.
Junior Application Security Engineer (Basingstoke, Hybrid 2 days onsite)
Junior Application Security Engineer (Basingstoke, Hybrid 2 days onsite)
Infosum Limited
Basingstoke, Hampshire
Competitive
Familiarity with common security issues (e.g., OWASP Top 10, API security basics).
Familiarity with common security issues (e.g., OWASP Top 10, API security basics).
Identify opportunities for process improvements within the CRM system and recommend efficiency solutions, including integrations via API or native 3rd party tools and datasets.
Identify opportunities for process improvements within the CRM system and recommend efficiency solutions, including integrations via API or native 3rd party tools and datasets.
Knowledge of REST APIs and tools for testing API endpoints
Knowledge of REST APIs and tools for testing API endpoints
Senior Site Reliability Engineer, Managed Kubernetes - Europe
Senior Site Reliability Engineer, Managed Kubernetes - Europe
Lambda Group Limited
London
£161,000 - £310,000 a year
Proven experience provisioning Kubernetes using tools such as kubeadm, Cluster API, or similar
Proven experience provisioning Kubernetes using tools such as kubeadm, Cluster API, or similar
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Lead Java Engineer - IBM Sterling OMS & Sterling Intelligent Promising (SIP)
Lead Java Engineer - IBM Sterling OMS & Sterling Intelligent Promising (SIP)
Mindera
London
Competitive
Familiarity with API-based orchestration between OMS, SIP, and external fulfilment or inventory systems.
Familiarity with API-based orchestration between OMS, SIP, and external fulfilment or inventory systems.
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