Software Engineer

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London, London THRivve by intelletec

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Senior Software Engineer | Hybrid | London We are hiring for an innovative analytics software company powering global credit investment is expanding its engineering team and looking for a Senior Software Engineer to help shape its next generation of data products. This is a unique opportunity to influence the technical roadmap at a high-growth fintech scale-up working with top-tier global financial institutions. The role involves building and scaling backend systems in Node.js and Python, deploying on AWS (Lambda, DynamoDB, PostgreSQL), and collaborating closely across engineering, product, and customer teams. Ideal Candidate: Proven experience with backend/fullstack development using Node.js , Python , and AWS serverless architecture Strong database design skills (PostgreSQL, DynamoDB, Elasticsearch) Familiarity with frontend frameworks like Vue or React Comfortable mentoring developers and influencing technical direction Experience in financial services or a data-heavy B2B environment is a plus Tech Stack: Node.js , Python , AWS (Lambda, DynamoDB, CloudWatch, CloudFormation), PostgreSQL, Elasticsearch, Terraform Location: Hybrid, based in London (Victoria) — flexible home/office split Please apply now!
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Software Engineer

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London, London Stanford Black Limited

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Software Engineer - Python/C++ - Up to £140,000 Base Salary - 2 years experience One of the most successful and profitable systematic trading firms are looking for the next generation of talented engineers to invest in. You would get the opportunity to work side by side with some of the most gifted and knowledgable teams across London. You'll get the opportunity to build distributed, low-latency, high performance systems with reliable and scalable back-ends which are powering critical trading operations. You will be driving the design and implementation of trading frameworks, market data solutions and global market connectivity. As well as massively parallel, high-volume distributed applications to enable the technology to scale concurrently with company growth. Required Qualifications/skills: Degree in Computer Science or related field. 3 years commercial experience in a relevant role such as software or quantitative engineering. Strong programming skills in either Python or Java. In depth understanding of Complexity Theory, Data Structures and Algorithm design. Benefits: Top of the market compensation package. Uncapped bonuses. Private Health Care 25 days annual leave Pension contribution Training budget allocation Free Lunch and snacks in the office. And many more!
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Software Engineer

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London, London Stanford Black Limited

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Software Engineer - Python/C++ - Up to £140,000 Base Salary - 2 years experience One of the most successful and profitable systematic trading firms are looking for the next generation of talented engineers to invest in. You would get the opportunity to work side by side with some of the most gifted and knowledgable teams across London. You'll get the opportunity to build distributed, low-latency, high performance systems with reliable and scalable back-ends which are powering critical trading operations. You will be driving the design and implementation of trading frameworks, market data solutions and global market connectivity. As well as massively parallel, high-volume distributed applications to enable the technology to scale concurrently with company growth. Required Qualifications/skills: Degree in Computer Science or related field. 3 years commercial experience in a relevant role such as software or quantitative engineering. Strong programming skills in either Python or Java. In depth understanding of Complexity Theory, Data Structures and Algorithm design. Benefits: Top of the market compensation package. Uncapped bonuses. Private Health Care 25 days annual leave Pension contribution Training budget allocation Free Lunch and snacks in the office. And many more!
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Software Engineer

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London, London Harrington Starr

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permanent
Software Engineer Key Technologies: C#, SQL, React, Bloomberg, Fidessa, FactSet APIs London Perm Role | 4 Days Onsite £55,000 - £5,000 Harrington Starr has partnered with a well-established London based Investment Bank to find a Full Stack Developer at the Associate level. This is a hands-on development role, supporting a range of internal systems across trading and business operations. Key Responsibilities: Develop and maintain software using C#, SQL, and React Integrate real-time and historical data from third-party APIs Follow agile sprint plans and deliver reliable, secure solutions Ensure systems meet regulatory and cybersecurity standards Key Benefits: Salary up to 5,000 depending on experience 4 days onsite in a central London office Exposure to front-to-back office technology and teams Strong bonus and benefits package Key Requirements: Experience in financial services or trading environments Proficiency in C#, SQL Server, and front-end development (React preferred) Experience working with APIs and market data (e.g. Bloomberg, Fidessa) Strong communication, problem-solving, and collaboration skills Other Information: Agile working culture in a fast-paced environment No visa sponsorship – candidates must have full UK working rights Ideal for developers looking to grow in a cross-functional financial tech team Direct communication with business and technical stakeholders To apply, please use the link provided or reach out directly to arrange a confidential conversation:
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Software Engineer

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London, London Reelables

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Ready to revolutionize global logistics? Join Reelables and help us transform how the world tracks packages! We're not just another startup – we're pioneering paper-thin smart shipping labels that use Bluetooth and 5G to track millions of packages globally. Imagine building products that touch every corner of the supply chain, from a small business shipping their first product to massive cargo containers crossing oceans. This isn't your typical product role. You'll be architecting customer experiences that directly impact billion-dollar supply chains, designing intuitive dashboards that make sense of complex IoT data streams, and building features that logistics managers around the world will rely on daily. Every line of code you write will help businesses track their most valuable assets in real-time. Who we are Reelables is a rapidly scaling tech company based in North London (near Angel), developing the world's most advanced smart shipping labels. Our breakthrough technology is already transforming how companies track and manage their shipments globally, and we're just getting started. Responsibilities Product Innovation & Customer Impact Drive the end-to-end development of customer-facing features that directly impact user experience and business outcomes Transform complex IoT data streams into intuitive, actionable insights for logistics professionals Design and build responsive web applications that handle real-time tracking data from millions of labels worldwide Collaborate directly with customers to understand pain points and translate them into elegant technical solutions Technical Leadership & Quality Architect scalable frontend solutions that can handle massive data visualization and real-time updates Write production-ready code with comprehensive testing, monitoring, and error handling Champion user experience best practices and ensure our platform delights customers at every touchpoint Lead technical discussions on product architecture and contribute to strategic technology decisions Rapid Innovation Culture Ship code daily in our lean, fast-moving environment where your work goes live immediately Mentor team members and elevate our overall engineering standards Proactively identify opportunities to improve our development processes and customer satisfaction Take ownership of features from conception through deployment and ongoing optimization Experience Core Technical Skills Frontend Excellence : Expert-level TypeScript, React/Vue.js, with a strong eye for UX/UI design Full-Stack Capability : Node.js experience for seamless frontend-backend integration Cloud-Native Development : Hands-on AWS experience, particularly with serverless architectures Modern DevOps : Proficiency with CI/CD pipelines, automated testing, and deployment strategies Product-Focused Experience Track record of building customer-facing applications that handle complex data visualisation Experience working closely with product managers, designers, and customers to deliver exceptional user experiences Understanding of real-time data systems and how to make them accessible to non-technical users Background in B2B SaaS products or logistics/supply chain technology (bonus!) Growth Mindset Passion for working in a fast-paced start-up environment where you can see direct impact Strong communication skills and ability to explain complex technical concepts to various stakeholders Experience mentoring others and contributing to team culture
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Software Engineer

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London, London Retelligence

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Mid-Level Software Engineer We’re looking for a skilled Software Engineer to join a dynamic engineering team, helping to design, build, and maintain scalable, cloud-native systems. You’ll work hands-on across the full development lifecycle using C#, .NET, and Azure microservices, contributing to high-quality, reliable, and performant solutions that support complex financial transactions. Key Responsibilities Software Design & Development Design, build, and maintain distributed, high-availability systems using C#, .NET Core , and Azure services. Contribute to architectural discussions and help evolve a modern, microservices-based platform. Translate business requirements into clean, efficient, and testable code. Participate in code reviews , ensuring technical quality and adherence to best practices. Engineering Delivery Work collaboratively within an Agile team to plan, estimate, and deliver engineering initiatives on time. Implement and maintain CI/CD pipelines , automated testing, and observability tools. Contribute to continuous improvement across systems, processes, and tooling. Technical Excellence Gain hands-on experience with messaging and event-driven architectures such as Azure Service Bus or Kafka . Help ensure solutions are scalable, secure, and maintainable. Troubleshoot production issues, support operational stability, and participate in on-call rotations when needed. Collaboration Partner closely with Product, Architecture, and QA teams to deliver robust and valuable solutions. Communicate technical concepts clearly to both technical and non-technical team members. What We’re Looking For Solid commercial experience in C# and .NET Core development. Practical understanding of Azure and cloud-native services. Experience working with microservices and distributed systems. Familiarity with messaging platforms such as Service Bus or Kafka . Understanding of Agile software delivery practices, version control, and modern DevOps tools. Previous experience in financial services , payments , or high-volume transactional systems is a plus.
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Software Engineer

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London, London Harrington Starr

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Engineer (with Data Analytics) – Fintech – London/Hybrid An innovative fintech is seeking a Engineer to join its core engineering team. The business processes terabytes of market data daily using an advanced AWS-based platform, and this role will be central to scaling and optimising that infrastructure. The role: Design and build scalable solutions on AWS. Ensure system reliability, monitoring, and performance. Implement workflow automation and CI/CD pipelines. Collaborate with engineering teams on large-scale data pipelines. Continuously evaluate new tools and technologies. Requirements: Strong Python skills. Experience with AWS and cloud-based systems. Background with Linux, Docker, SQL/relational databases. 2 years’ industry experience and a STEM degree. Bonus: Spark, Kafka, Terraform, Airflow or similar. What’s on offer: Competitive salary bonus. Hybrid working (2–3 days London office). 25 days holiday bank holidays, pension, private medical. Ongoing training, socials, and wellbeing perks. An excellent opportunity for an engineer who enjoys solving complex infrastructure challenges at scale.
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Software Engineer

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London, London STS Digital Group

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OTC Trading Software Engineer STS Digital ( is a leading regulated digital asset trading firm specialising in OTC trading and market making. While trading is headquartered in Bermuda, technology development is provided by a vibrant global engineering team. We are looking for a Software Engineer to join our OTC Trading Technology (OTC) team, which builds and maintains systems that power our OTC Spot and Options RFQ trading, structured products, and client-facing services. This includes our internal trading platforms, client portal, APIs, and integration with pricing and risk systems. The position will report to the OTC Team Lead. Primary Responsibilities • Design, implement, test, deploy, and maintain OTC trading systems (primarily in C#) supporting Spot, Options, and Structured Products workflows. • Build and enhance API services (REST, WebSocket, FIX 4.4) used by clients and internal trading systems. • Work closely with traders, quants, and other engineers to deliver performant, secure, and scalable solutions. • Collaborate with the Principal Engineer and team leads to ensure systems meet engineering standards and business objectives. • Contribute to development of the Client Portal, Admin Portal, and RFQ trading engines. • Integrate with quantitative pricing models, market data, and downstream systems. • Investigate and resolve production issues promptly, ensuring minimal impact on trading operations. • Participate in code reviews, regression testing, and performance tuning of trading workflows. • Contribute to continuous integration and delivery pipelines using GitHub and ArgoCD. • Support infrastructure deployment and troubleshooting within AWS. More Info STS Digital provides trading solutions and market making for digital assets. As our client base and trading volumes grow, the OTC Trading Technology team is at the forefront of developing and maintaining systems that underpin our trading business. This is a hands-on engineering role focused on building robust and responsive trading systems that operate in a fast-paced environment. We are seeking a proactive engineer who takes ownership of deliverables, works collaboratively across teams, and thrives in solving complex technical challenges that directly impact trading performance and client experience. Expected Qualifications • 3 years’ experience in software engineering, ideally with C#. • Solid understanding of trading technology and API-driven systems. • Prior experience in financial markets, preferably OTC or RFQ trading systems. • Strong problem-solving skills and a structured approach to design, troubleshooting, and debugging. • Exposure to cloud and containerised environments (ideally AWS and Kubernetes/EKS). • Good verbal and written communication skills; comfortable working with traders and cross-functional stakeholders. • Fluent in English, both written and spoken. Beneficial • Experience with Python and React. • Detailed experience with AWS (EKS, EC2). • Experience working on real-time or low-latency distributed systems. • Familiarity with quantitative pricing integration and automated testing frameworks. • Understanding of risk management, order management systems (OMS), and trade lifecycle workflows. • Experience building FIX or WebSocket APIs for trading. • Options and structured products experience. Our Tech Stack • Backend: C#, Python • Frontend: React • Databases: PostgreSQL, DynamoDB • Infrastructure: AWS (EKS, EC2) • Version Control & CI/CD: GitHub, ArgoCD This role offers an exciting opportunity to build mission-critical trading systems that directly support STS Digital’s OTC trading business. You will gain deep exposure to RFQ trading workflows, pricing integration, and client systems while contributing to a world-class digital asset trading platform.
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Software Engineer

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London, London Understanding Recruitment

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Software Engineer | Climate Tech | London (Hybrid) Want to code for impact ? This early-stage climate tech startup is building the software powering the transition to a cleaner, smarter energy system - and they’re looking for engineers who love to move fast, solve hard problems , and see their work make a real difference. Backed by top-tier investors, the team is developing a platform that shifts energy use to the cleanest, cheapest times , managing EV charging, home batteries, and heating systems at scale. Their machine learning models forecast demand and optimise energy flows to build a low-carbon grid that actually works. Why join: High ownership and technical freedom Meaningful projects with real environmental impact The chance to help shape both the product and the engineering culture What they value: Curiosity and a bias for action - ship fast, learn faster A genuine drive to tackle climate change through technology Comfort with ambiguity and startup pace Interest in mentoring and growing a tight-knit, mission-driven team They’re open to all OOP languages (core stack is Python ). London | Hybrid (2-3 days/week) If you’re ready to build software that accelerates the shift to clean energy - apply now!
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Software Engineer

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London, London TRIA

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Software Engineer Hybrid - London - 3 days a week £55,000 - £60,000 Bonus & Benefits Our client is a FTSE100 market leading organisation who are looking for a Software Engineer to join their growing digital solutions team. You’ll be involved in ensuring solutions are scalable, secure and widely adopted across the business. You'll need to demonstrate previous experience in using cloud services and modern software development. You’ll also be responsible for promoting best practices across the wider company and supporting teams in adopting them. We’re looking for candidates who possess the following: Experience with Azure Ecosystem Working on creating Proof of Concepts and prototypes Interest in emerging areas such as AI or automation Excellent stakeholder communication skills If you meet some of the above requirements please apply for more information.
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