13 of 13 Permanent JSON Jobs in the City of London

APIs • Strong PostgreSQL experience, including complex queries and performance optimisation • Experience with Redis and Sidekiq for background job processing • Experience working with REST APIs, JSON serialisation, and authentication methods such as JWT or SSO • Experience working with AWS-based infrastructure • Experience using Docker within development or production environments • Experience troubleshooting ...

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 ...

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 ...

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 ...

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. ...

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 ...

Engineering & Automation Proven experience designing and maintaining ETL/ELT pipelines. Strong scripting capabilities (Python preferred). Experience handling heterogeneous data formats (CSV, XML, JSON, APIs). Experience implementing batch and incremental ingestion patterns Understanding of data transformation, standardisation, and historisation techniques. Data Quality & Governance Experience implementing validation rules ...

authentication schemes (OAuth, API keys, mTLS), explain webhook patterns. Know the difference between synchronous and asynchronous integrations. Data Architecture: Understand ETL, data lakes, warehouses, JSON/XML payloads, and how data moves between systems. Can scope data volume and throughput requirements. Compliance Infrastructure: Familiar with GRC tool workflows (task management ...

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 ...

mentoring skills to guide Client Delivery Managers Ability to translate complex client requirements into actionable technical solutions Desirable: Proficiency in API concepts (REST, JSON, authentication methods) Advanced understanding of SaaS product architecture and capabilities Ability to manage multiple technical projects simultaneously What you’ll be offered Recharge and Give Back ...

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 ...

functional programming concepts and idiomatic Scala (immutability, monads; familiarity with Cats or Scalaz is a plus). Experience designing and consuming REST APIs , including JSON validation/serialization (Play JSON, Circe). Proficiency with relational databases (PostgreSQL) and/or NoSQL (MongoDB), including schema design and query optimization. Proven experience ...

Location: London (hybrid) Setup: 2-3 days in office Language: English Focus: Data modelling, integrations, customer delivery Stack: CRM (Salesforce/HubSpot), APIs, JSON, data warehouse Comp: ~£65-75k base + bonus Growth: 315% YoY The role You’ll work directly with customers and commercial teams to build … based on real CRM data translating GTM needs into data models and queries integrating data into CRMs, sequencing tools, and warehouses working with APIs, JSON, and data pipelines iterating continuously based on performance and feedback feeding insights back into Product and Engineering Why this role exists The company is scaling ...