1 to 25 of 36 Permanent JSON Jobs in London

testing REST APIs, GraphQL services, and microservice-based systems . Experience with API testing tools such as Postman or SuperTest and strong understanding of JSON schema validation . Hands-on experience with performance testing tools such as Apache JMeter, k6, or similar frameworks . Strong understanding of automation design patterns ...

such as HTML, CSS and JavaScript. • Hands‐on experience with tools such as Selenium, Playwright or similar automation frameworks. • Solid understanding of API testing, JSON/XML formats and tools such as Postman or Swagger. • Familiarity with CI/CD pipelines and version control. • Comfortable working in data‐rich environments ...

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 ...

building UI tests with tools such as Selenium or Playwright. * Working knowledge of test frameworks such as JUnit or TestNG. * Understanding of APIs, HTTP, JSON and related testing tools. * Comfortable working in data-rich environments and validating data accuracy. * Experience using AI tools within your engineering workflow to accelerate development ...

optimizing SQL queries on PostgreSQL databases. Strong experience with multithreading, data structures, and concurrency scenarios. Proficient in using REST APIs, XML, JAXB, and JSON in creating layered systems. Experience with AWS Services (AWS Lambda, AWS CloudWatch, API Gateway, ECS, ECR, SQS, SNS). Familiarity with Open AI APIs, Agentic ...

when needed to ship fixes or smaller features end-to-end. Tech Stack Backend: C#/.NET 6–10, Entity Framework Core, REST APIs, JSON Frontend: Vue.js 3+, Blazor (admin) AI Tooling: Claude Code, GitHub Copilot, Codex Infrastructure: Docker, GitHub Actions (CI/CD), Azure/AWS/GCP Testing ...

serverless technologies (e.g. AWS Lambda, API Gateway) Solid knowledge of Linux-based systems Ability to write code/scripts (ideally Python, plus YAML/JSON) Experience working with distributed, enterprise-level systems Strong communication skills and ability to work with stakeholders Additional Desirable Skills Experience with tools such as Ansible ...

services (strongly preferred) and cloud-native patterns C# or Java Containerisation (Kubernetes/Docker/OpenShift) Infrastructure as code (Terraform) Integration and messaging (APIs, JSON/Swagger/OpenAPI, AMQ or similar) CI/CD and DevOps tooling; Git-based workflows Nice to have Endur modernisation experience (e.g., upgrades, cloud ...

Skills & Experience Strong experience with CSS3, JavaScript, and React. Experience with Back End development and SQL databases. Experience implementing REST APIs and working with JSON/XML data formats. Experience with Google Analytics and conversion/lead tracking systems. Experience building responsive, high-performing websites. Strong understanding of UI/ ...

Solid practical experience with Kubernetes Experience across a broad range of GCP services Source control using Git/GitHub Comfortable working with and processing JSON and YAML Strong understanding of cloud security principles and best practices GCP Associate Cloud Engineer certification (or equivalent practical experience) Required Skills Programming experience ...

first products that deliver measurable value. • Develop and deploy production‐grade AI agents on GCP using ADK, integrating with internal systems via REST and JSON APIs. • Build and maintain robust evaluation and monitoring frameworks, including online and offline testing, A/B experiments and performance dashboards. • Integrate AI agent functionality ...

tools such as Apache Spark or in this instance LakeFS, for data processing and management. Useful: R, Apache Spark Very Useful: Python, SQL, JSON, LakeFS ...

migration/transformation programmes* Expertise across conceptual, logical, and physical modelling* Strong stakeholder management skills* Experience working in Agile environments* Knowledge of UML, RDBMS, JSON/XML* Knowledge/experience of Erwin Desirable: * Knowledge of industry data standards (e.g. fpML, FIX, FIBO)* Experience with ontologies (RDF/OWL/ ...

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 ...

operate production‐grade AI agents on GCP using Google’s ADK Integrate AI systems with policy, claims and CRM platforms via REST/JSON APIs Develop scalable RAG pipelines including ingestion, text processing and vector search Implement evaluation, monitoring, A/B testing and cost/latency dashboards Shape architectural ...

Platform. Experience with electronic market protocols: FIX (4.x/5.x) Market-specific APIs (Tradeweb, Bloomberg, MTS, etc.) Binary/Streaming protocols (ITCH, FAST, SBE, JSON over TCP). Familiarity with low-latency patterns, high-throughput messaging, and microservices. Additional Skills Experience with Linux, shell scripting, and performance analysis tools. Knowledge ...

reporting Build event-driven workflows across email, Teams, APIs, and databases Architect Agent Systems Modular task decomposition Guardrails and validation layers Structured output validation (JSON schemas, rule checks) Logging, observability, fallback logic, and confidence scoring Secure credential and secrets management Governance & Scale Ensure explainability and traceability Design compliant automation aligned ...

insights. Key Responsibilities: Design and maintain Adobe Analytics tracking implementations using Adobe Launch (Tags) or AEP Web SDK . Develop and manage data layers (JSON/XDM) to ensure consistent and reliable data collection. Configure analytics components such as eVars, props, success events, and processing rules in the Adobe Analytics ...

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 ...

working knowledge of data integration and modelling, including writing SQL, working with relational databases, and connecting to data sources such as Databricks, data lakes, JSON files, and API-driven services. Experience working confidently across multiple, complex datasets, understanding data lineage, definitions, and limitations, and ensuring outputs are accurate, consistent ...

Automation (CSA) Operations Orchestration (OO) workflow development and content pack engineering Strong API integration skills Nice to Have Skills Scripting skills ( Python, PowerShell, Bash, JSON/YAML processing ) Experience with CI/CD or version-controlled automation workflows ( Git ) Experience working within regulated enterprise environments ...

migrations. Shape and document metadata, lineage, catalogues and source-to-target mapping. Contribute to ETL design and data movement patterns across platforms. Work with JSON, XML, Parquet and other semi-structured formats used across financial systems. Engage senior stakeholders and guide best practice within multidisciplinary teams. Principal level: provide thought ...

with a track record of leading design sessions and crafting detailed, technical solutions for SaaS platforms You are familiar with web technologies and frameworks (JSON/XML, CSV, Responsive Design, Restful APIs). Fluency in English. We welcome collaborators with their diverse perspectives and experiences to power us forward. These ...

with citations – in seconds You might be a fit if You write solid Python and actually enjoy debugging ugly real‐world data and integrations JSON, APIs and webhooks are just part of how you think about systems You’ve built data/ML/automation workflows before and can roughly ...

Solid understanding of functional programming concepts and idiomatic Scala (e.g., immutability, monads, cats/Scalaz familiarity advantageous). Experience designing and consuming REST APIs, JSON validation/serialization (Play JSON, Circe). Experience with relational databases (PostgreSQL) and/or NoSQL (MongoDB), including schema design and query optimisation. Proven experience ...