Back-end Engineer

build and scale the infrastructure behind Scenario Builder, our electricity grid modelling platform. Scenario Builder is an in-browser platform that currently provides capacity expansion and dispatch modelling through an accessible no-code interface. The vision for Scenario Builder is to expand into power flow modelling to create a fully integrated grid modelling platform with the features and functionality needed to enable users to develop bankable scenarios that support energy investment decisions.You will work closely with the wider product and engineering team to design, develop, and maintain the back-end services that power our platform. You will also be expected to mentor and guide more junior engineers on best practices and system design.This hybrid role is based out of our London office near Waterloo Station and reports to the Head of Platform.ResponsibilitiesBack-end development & architecture Design, develop, and maintain scalable back-end services and APIs using Python and, current with industry trends and best practices, bringing new ideas and technologies to the team. Mentor junior engineers and contribute to a culture of technical excellence and continuous improvement.Skills and experienceEssential 5+ years of experience in back-end software development, with strong proficiency in Python. Experience designing and building RESTful APIs and microservices architectures. Strong understanding of database technologies (PostgreSQL, Redis, Firestore), ORMs and data modelling principles. Experience with cloud platforms (preferably GCP) and containerisation technologies (Docker). Solid understanding of software engineering best practices, including testing, code review, and documentation. Excellent problem-solving skills and ability to work independently on complex technical challenges.Desirable Experience with AGILE/Scrum based ways-of-working Experience in the energy sector or with computational modelling/simulation software. Understanding of OAuth, Job Description Senior DotNet Backend Developer - WealthTech SaaS Platform - London, UK - 6 Month Contract (Outside IR35) A global wealth management technology provider is seeking multiple DotNet Backend Developers to contribute to its core enterprise SaaS platform used..., Our client is seeking an outstanding senior front end developer to work on the evolution of it's flagship mobile product. Reporting to a Software Engineering Manager, the Senior Front End Software Engineer is a major contributor and technical influencer within an..., Our client is seeking an outstanding senior front end developer to work on the evolution of it's flagship mobile product. Reporting to a Software Engineering Manager, the Senior Front End Software Engineer is a major contributor and technical influencer within an... © 2026, Jobsora.com

Job title: Senior Software Engineer (Back-End)Location: UK Hybrid (minimum working 2 days per week in our London office)Contract Type: Permanent, Full-TimeSalary: £73,101 - £85,600About youYou should have a long-term commitment to advancing the energy transition and be driven to build robust, scalable systems that power our grid modelling platform. Passionate about creating highly performant back-end services, you understand the technical challenges associated with building niche B2B products that handle complex computational workloads. In addition to seeking out people with a proactive, problem-solving attitude and an eye for detail, as a growing organisation, collegiality and empathy for our coworkers are a requisite. While we are a rapidly growing tech startup, we are also a non-profit, so a high level of adaptability and willingness to approach challenges with creativity and curiosity is essential.About the roleWe are looking for an experienced Senior Back-End Engineer to help, and web security best practices Familiarity with scientific computing libraries (NumPy, Pandas) and optimisation frameworks. Experience with generative AI/LLMs in applied engineering contexts Experience with infrastructure-as-code tools (Terraform, Terragrunt) and GitOps practices.About usWe are a climate-tech startup established in 2021. We provide electricity grid modelling software to accelerate energy planning in emerging markets and developing economies. Today's tools are costly, closed, and hard to use, with modelling studies taking months or years when they should take weeks or days. We designed Scenario Builder to meet this challenge, so energy planners and investors can make better decisions, faster.Our funding currently comes from a range of US and EU foundations, including the Quadrature Climate Foundation, Google.org, the Sequoia Climate Foundation, Bloomberg Philanthropies, and the European Climate Foundation.At TransitionZero, we understand that diversity

is an essential component of a successful team, whether that be diverse ways of thinking, personal or professional backgrounds, or skills. We aim to be the most talented non-profit in our vertical through our culture of ownership and adaptability.Benefits Enhanced competitive pension scheme - auto-enrollment from day 1 25 days annual leave (excluding UK public holidays) and an additional discretionary days off such as over the festive period 20 days of annual allowance to work from anywhere in the world Hybrid working and core working hours model Allowance to set up your home office Annual budget and dedicated leave time for relevant training courses Enhanced gender-neutral parental leave (16 weeks fully paid) Private healthcare following the successful completion of the probation period Yearly team offsitesOur commitment to diversity, equity, and inclusionStudies have shown that some people from marginalised or underrepresented groups are less likely to

modern frameworks (FastAPI). Design and build high-performance API endpoints to handle complex hierarchical data queries and multi-dimensional aggregations for grid modelling computations Ensure system reliability, performance, and security through best practices in code quality, testing, and monitoring. Collaborate with front-end engineers to design and implement RESTful APIs that support our web application.*Infrastructure & DevOps Manage and optimise cloud infrastructure (GCP) to support our computational workloads. Implement and maintain CI/CD pipelines to enable rapid, reliable deployments. Monitor system health and performance, proactively identifying and resolving issues. Implement and maintain infrastructure-as-codeTechnical leadership & collaboration Participate and lead in code reviews, architectural discussions, and technical planning sessions. Collaborate with cross-functional teams, including product, data engineering, and modelling, to deliver impactful features. Stay, Job Description Onda is a specialist cyber insurance MGA, backed by the world's leading cyber insurers. We help brokers and their clients understand cyber risk using our proprietary platform Navigator and cover every connection. Our Belief: We are good people, doing good..., About the Company We are working with an exciting Series B company that is committed to empowering small and medium-sized businesses, helping them maintaining healthy cash flow, often complicated by the complexities of payment management. They address this by digitising..., Onda is a specialist cyber insurance MGA, backed by the world s leading cyber insurers. We help brokers and their clients understand cyber risk using our proprietary platform Navigator and cover every connection. Our Belief: We are good people, doing good business with... UK's Fastest Growing Fintech/Payment Start-up | £90K + Equity | Senior Back End Engineer (Node.[...] Owen Thomas | Pending B Corp Overview UK's Fastest Growing Fintech/Payment Start-up | £90K + Equity | Senior Back End Engineer (Node.js) | 2 Days LDN I'm reaching out with an opportunity to join one of the UK's fastest-growing payments start-ups that's scaling at 5-10% growth every week since launch....