1 to 25 of 44 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 ...

DevOps Engineer (SC cleared)

Hiring Organisation
Lynx Recruitment Ltd
Location
London, UK
Employment Type
Full-time
/CloudFormation) CI/CD pipelines (e.g. Jenkins, Git) Serverless tech (AWS Lambda, API Gateway) Linux systems knowledge Scripting/coding (Python, YAML/JSON) Experience with enterprise systems Strong communication skills ...

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 ...

Mainframe Developer

Hiring Organisation
Ampstek
Location
London Area, United Kingdom
CICS webservices, ZOS Connect EE, DB2, and batch processing. • Strong skills in mainframe transaction management, JCL, and system debugging tools. • Familiarity with SOAP, WSDL, JSON, and integration patterns such as SOA and RESTful APIs. • Good working knowledge of AWS services, particularly CloudWatch, DynamoDB, and Lambda, including monitoring, troubleshooting, and optimisation. ...

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 ...

NEC Housing Developer - Contract Role

Hiring Organisation
Reed
Location
London, UK
Employment Type
Full-time
Apex Proven experience configuring or upgrading NEC Housing management systems In-depth understanding of NEC Housing database structures and data models Experience with XML, JSON, SOAP, and REST integrations Desirable: Java development experience Local authority or social housing experience This is a specialist short-term engagement supporting a major implementation ...

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 ...

Terraform Infrastructure Engineer / IaC SME

Hiring Organisation
Salt Search
Location
London, UK
Employment Type
Full-time
providers (Nutanix, VMware, storage, ...) Good knowledge of Ansible, Tower, python, PowerShell, bash, C##, .NET, Rest/Open API, Power BI, YAML, JSON Soft Skills: Ability to build relationships with customers and influence and negotiate to achieve defined goals Ability to distinguish between quick wins and long-term goals Active ...

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. ...

Senior Data Engineer

Hiring Organisation
DATAHEAD
Location
City of London, London, United Kingdom
datasets for reporting and analytics Comfortable working in a fast-paced, evolving data environment Nice to Have Experience with Airflow or Dagster Working with JSON/semi-structured data Familiarity with CI/CD pipelines and Git Why Join Work with high-volume, real-world marketing data across multiple platforms ...

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 ...

SOC Engineer - 6 Month FTC

Hiring Organisation
Precise Placements
Location
London, UK
Employment Type
Full-time
Technical Expertise Hands-on experience with leading SIEM platforms (e.g., Exabeam, LogRhythm, ArcSight, Microsoft Sentinel, Splunk, QRadar, Elastic). Strong understanding of log formats (JSON, syslog, XML, CEF, etc.) and ingestion technologies (Syslog, API, Event Hubs, Kafka, Agents). Practical knowledge of detection engineering, threat modelling, and attacker behaviour analysis. ...

C# .Net Software Developer

Hiring Organisation
Ashdown Group
Location
London, UK
Employment Type
Full-time
with solid Azure cloud experience. The ideal Senor C# .Net Developer will have previous experience with: 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 ...

Senior OPERA PMS & OHIP Specialist

Hiring Organisation
Salt
Location
London Area, United Kingdom
Reservations & Front Desk Cashiering & Folios Profiles & Rate Management Night Audit processes Proven experience with OHIP (Oracle Hospitality Integration Platform) Strong understanding of: REST APIs & JSON API testing tools (Postman or similar) Ability to map API payloads back to real OPERA behaviour Strong analytical mindset — you enjoy digging into data inconsistencies ...

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 ...

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 ...