1 to 25 of 31 Permanent JSON Jobs in London

Mid-Senior Ruby on Rails Engineer (B2B SaaS | Hybrid | UK)

Hiring Organisation
Transreport
Location
City of London, London, United Kingdom
experience with PostgreSQL, including performance tuning and complex queries. Experience with background job processing using Sidekiq and Redis. Solid understanding of RESTful API design, JSON serialization, and authentication (e.g., JWT, SSO). Hands-on experience with AWS services and containerised deployments (Docker). Experience troubleshooting and supporting production systems. Comfortable ...

Python Automation Engineer

Hiring Organisation
Tata Consultancy Services
Location
London Area, United Kingdom
skills/knowledge/experience: Strong hands‐on experience with Python for test automation Proven experience using PyTest framework Experience in API automation (REST, JSON, Postman/Newman, requests, etc.) Good understanding of test design techniques, test data management, and reporting Experience with CI/CD tools such as Jenkins ...

Senior Technical Lead

Hiring Organisation
Nextech Group Limited
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£90,000
NinjaOne RMM, 3CX, Microsoft 365/Graph API * Strong JavaScript and/or Python for integration scripting and automation * REST API design - webhooks, OAuth, JSON transformation, event-driven architecture * Cross-platform data mapping across multiple SaaS systems * Technical documentation to a professional standard * Comfortable operating autonomously within a management structure ...

Senior Technical Lead

Hiring Organisation
Nextech
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£85,000 - £90,000 per annum
NinjaOne RMM, 3CX, Microsoft 365/Graph API* Strong JavaScript and/or Python for integration scripting and automation* REST API design - webhooks, OAuth, JSON transformation, event-driven architecture* Cross-platform data mapping across multiple SaaS systems* Technical documentation to a professional standard* Comfortable operating autonomously within a management structure ...

Senior .NET Integration Engineer (with Blazor experience)

Hiring Organisation
McCabe & Barton
Location
London, United Kingdom
Employment Type
Permanent
Salary
£85,000
system design Develop integrations with third-party systems and internal platforms using APIs Support development of web applications using C#, ASP.NET, Razor, and JSON-based services Skills & Experience 5+ years' experience in .NET Front End development Strong hands-on experience with Blazor (Server and/or WASM) Solid understanding ...

UI Engineer

Hiring Organisation
McCabe & Barton
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£85,000
integrations from third-party systems using APIs connected to back-office systems. Build and maintain web applications to support business processes (C#, Razor, ASP.NET, JSON, Redis Cache, Microservices). Technical Skills & Experience 5+ years of professional experience in .NET-based front-end development. 5+ years of hands-on expertise ...

Senior Technical Consultant - ServiceNow

Hiring Organisation
COMPUTACENTER (UK) LIMITED
Location
South East London, London, United Kingdom
Employment Type
Permanent
ServiceNow platform, including functionality, database structure, developer APIs, and development tools. Proficient in Web Technologies (e.g., JavaScript, SOAP/REST web services, XML & JSON). An open and friendly personality with strong customer-facing skills in both a virtual and face to face setting (including the ability to deliver presentations ...

Senior Mobile App Developer (iOS/Android)

Hiring Organisation
Stott & May Professional Search Limited
Location
London, United Kingdom
Employment Type
Permanent
Salary
£90,000
with a deep understanding of Jetpack libraries, Compose and modern Android architecture components. * Experience with Kotlin Multiplatform (KMM high desirable) * Experience with RESTful APIs, JSON, and mobile architecture patterns (MVVM, Clean Architecture). * Familiarity with Xcode, Android Studio, GitHub, mobile CI/CD tools, automated testing frameworks ...

Front End React Developer

Hiring Organisation
Ascend Consulting
Location
NW7, Mill Hill, Greater London, United Kingdom
Employment Type
Permanent
Salary
£45000 - £75000/annum Great Benefits
core principles Experience with Redux and RTK (RTKQuery also a bonus) Familiarity with RESTful APIs Knowledge of modern authorization mechanisms, such as JSON Web Token Familiarity with modern front-end build pipelines and tools (Github actions a bonus) Experience with common front-end development tools such as Babel, Webpack ...

Technical Product Manager

Hiring Organisation
City Elite Transaction Services Ltd
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£80,000 per annum
agile scrum team Familiarity with financial asset classes and the trading lifecycle Exposure to SQL and object-oriented languages Understanding of XML, FIX, JSON or other messaging formats and protocols Benefits Comprehensive health and wellness coverage Generous annual leave Continuous learning and development resources Competitive salary, retirement planning and financial ...

Test Manager

Hiring Organisation
coforge
Location
London, United Kingdom
Employment Type
Permanent
/or NDC. Hands-on experience with test management tools such as JIRA, ALM, qTest, Zephyr. Good understanding of APIs (REST/SOAP), XML, JSON, NDC schemas. Knowledge of automation tools (Selenium, Postman, Karate, RestAssured). Experience 8 15+ years in QA/testing, with at least 3+ years ...

Senior C# .Net Software Developer - B2C Web & Payment Gateways

Hiring Organisation
Ashdown Group
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
£80,000 - £90,000 per annum
.Net Developer will have previous experience with: B2C website development & B2C payment platforms Software design & architecture C# & .Net Core React.js &/or Next.js LINQ, JSON & Inversion of Control Azure PaaS, Function Apps, Blob/Table Storage, Service Bus Topics, Azure Search and API Management Infrastructure as Code (ideally Terraform ...

Python Developer

Hiring Organisation
Apex Systems
Location
City of London, London, United Kingdom
engineering experience. Technical Skills: Hands-on experience with automated testing, mocking frameworks, and CI/CD pipelines. Experience with the design and implementation of JSON RESTful APIs, including versioning and backward compatibility. Strong understanding and exposure to object-oriented practices and principles. ...

Ruby Developer

Hiring Organisation
Proactive Appointments
Location
London, United Kingdom
Employment Type
Permanent
Salary
GBP 70,000 - 80,000 Annual
Strong understanding of OOP & Rails architecture Extensive experience with PostgreSQL (performance tuning, complex queries) Background job processing with Sidekiq & Redis Expertise in RESTful APIs , JSON, JWT, SSO Experience with AWS & Docker Production system support & troubleshooting Strong communication skills & Agile/Scrum experience Ruby on Rails Developer Due to the volume ...

Manager, Sales Engineering Solutions engineering London

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
able to prioritise shifting workloads and responsibilities effectively. Familiar with API‐based integration methods, associated best practices, and related tools/frameworks (REST/JSON APIs, Postman). Experience with at least one common front‐end (pure JavaScript, React, Angular, etc.) and back‐end (Java, .NET, Python, Node, etc.) technology. ...

Ruby on Rails Backend Engineer

Hiring Organisation
Rise Technical Recruitment
Location
Fulham, London, United Kingdom
Employment Type
Permanent
Salary
£60000 - £80000/annum Private Healthcare + Holiday + Pensi
Rails developer with deep expertise in PostgreSQL and background processing via Sidekiq and Redis. You should be highly proficient in building RESTful APIs, managing JSON serialisation, and implementing secure authentication methods like JWT or SSO. Beyond coding, you will possess knowledge of Docker and AWS, alongside the communication skills required ...

M365 Automation Graduate Consultant

Hiring Organisation
Pi Digital Solutions
Location
Greater London, England, United Kingdom
concepts or data-driven automation Experience from university projects, internships or placements involving automation or systems design Familiarity with scripting, APIs, or structured data (JSON, XML, etc.) Interest in progressing towards a technical architect or specialist role Qualifications Bachelor’s degree (or equivalent) in Computer Science, Engineering, Information Systems ...

Technical Project Manager

Hiring Organisation
Just Eat Takeaway.com
Location
London, UK
similar role, preferably in a technology-driven industry. Technical Proficiency: Solid understanding of APIs, web services, and integration technologies. Familiarity with RESTful APIs, JSON, XML, and authentication mechanisms. Project Management Skills: Demonstrated expertise in project management methodologies, tools, and best practices. Ability to manage multiple projects simultaneously and meet deadlines ...

Senior Network Design engineer

Hiring Organisation
Sky
Location
E16PU, Spitalfields and Banglatown, Greater London, United Kingdom
Employment Type
Permanent
test plans, defects, test reports, MOPs, and change tickets. Good to have skills Practical experience with OpenConfig and vendor - specific NETCONF/YANG, including JSON/XML payloads. Strong understanding of IPv4aaS , particularly MAP-T . Strong understanding of BNG from Nokia (7750) and/or Huawei (CX600/NE8000 ...

Principal Solutions Consultant

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
customer experience platforms.* 3+ years leading large, strategic, and complex enterprise deals.* Deep technical fluency with web/scripting technologies (HTML, CSS, JavaScript, JSON, LLMs, MCP) and SaaS architectures.* Proven success in positioning the business value of technical solutions and the strategic role of Professional Services and Partners.* Hands ...

Client Services Manager - Derivatives and Prime Brokerage

Hiring Organisation
CBSbutler Holdings Limited
Location
London, United Kingdom
Employment Type
Permanent, Work From Home
Salary
£70,000
+ Bonus and Benefits. You will responsible for full system implementation projects and proof of concept (POC) projects, project management, client on-boarding, optimisation, JSON, Python, APIs, scripting, derivatives and/or trading lifecycle understanding, etc. * Be able to understand, at least at a high level, how Prime Brokerage margin ...

AI Engineer

Hiring Organisation
Fruition Group
Location
London, United Kingdom
Employment Type
Permanent
Salary
£90,000
platforms such as Copilot Studio Experience working with generative AI concepts (e.g. prompt design, RAG, grounding) Good understanding of integration patterns (APIs, REST/JSON, event-driven workflows) Experience with Microsoft ecosystem tools such as Power Platform and Microsoft 365 Knowledge of identity, access control, and secure system design Ability ...

Marketing Associate

Hiring Organisation
McGregor Boyall Associates Limited
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£55,000
needs into technical solutions and scalable workflows Strong stakeholder management skills with experience working across technical and non-technical team Working knowledge of SQL, JSON, or API troubleshooting Experience with customer data platforms (CDPs) and attribution models Exposure to AI-driven automation or agent-based workflows Understanding of data privacy ...

Head of SEO & Content

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
Keyword research & mapping Crawl optimisation SERP features optimisation Experience migrating a website Page speed optimisation Rank tracking Building SEO reports Schema mark-up (incl JSON-LD) Good working knowledge of crawling tools, including Screaming Frog or any cloud-based programs Knowledge of HTML, CSS, JS Experience working on off-site ...

CRM Build Lead

Hiring Organisation
Jobleads-UK
Location
Greater London, England, United Kingdom
segmentation, catalogues, and data structures Strong understanding of CRM QA, deliverability principles, and multi-channel communication build processes Confident working with data (SQL, Liquid, JSON, event structures) and partnering with technical teams Proven ability to manage, mentor, or lead a small team, with strong organisational and prioritisation skills Detail-obsessed ...