Transport for London★4.0 (429)· London

Work with AWS infrastructure administration, IaC (CloudFormation, Puppet, Ruby, Perl), Windows/Linux Server, and Sophos UTM. You will provide Level 2/3 support for TfL's in-house developed online services, including the website, API, and Journey Planner environments, while maintaining CI/CD practices.

Community Fibre Limited★3.3 (55)· London

You will work with AWS, Linux (Ubuntu, Debian, CentOS, RHEL), Python, Bash, Perl, Terraform, Puppet, Ansible, CI/CD pipelines, FreeRADIUS, Palo Alto Networks, FreeIPA, iptables, and OpenSearch/Elastic Stack. Community Fibre builds and operates London’s fastest 100% full-fibre broadband network. You will maintain both cloud and on-premises infrastructure, mentor other engineers, and act as a senior escalation point.

Apple★4.1 (14k)· London

You will work with RTL simulation tools, Linux, grid computing, scripting languages (Python/Perl), Cadence tool chain, and SystemVerilog/Verilog/VHDL. As part of Apple’s CAD Hardware Tech team, you will automate chip design processes and optimize simulation performance for Apple’s hardware products.

Booking.com★3.7 (1.2k)· London

Work on backend services using Java, micro-services, MySQL, Hadoop, Cassandra, and possibly AWS (DynamoDB, RDS, Step functions, EC2, Kinesis). The RegTech team in Fintech builds compliance and risk-management solutions, including sanctions screening, monitoring, and regulatory reporting.

Morgan Stanley★3.8 (5.4k)· London

Work with Scala, Java, and Python on a front-to-back trading and risk management platform for the Commodities division at Morgan Stanley. You will design and build systems supporting pre-trade pricing, trade lifecycle, risk management, and market data. This is a VP-level role on a global team.

You will use Red Hat Enterprise Linux, Python, SaltStack, Puppet, Chef, Git, Jenkins, and CI/CD tools to automate configuration, patching, and deployment for a global investment bank’s large-scale Linux platform. You will also develop infrastructure tooling, troubleshoot hardware, OS, network, and storage issues, and contribute to new platform solutions.

You will work with RedHat Linux, SaltStack, Puppet, Chef, Python, Git, Jenkins, CI/CD, and container technologies. The team maintains and enhances a large-scale, globally deployed RedHat Linux platform, driving automation, scalability, and platform reliability.

Cisco★4.1 (6.7k)· London

Work with IOS-XE/Catalyst switching, Meraki switching, cloud-management, CLI, packet captures, and automation tools (SQL, Python, Perl, TCL, Ruby). As a Cloud Switching BE Escalation Engineer, own technical reviews of complex Catalyst and Meraki switching issues, driving problems from unclear symptoms to actionable plans by coordinating Support, Engineering, and Product Management.

You will work with Windows and Linux servers, networking, automation (PowerShell, Python, Shell/Perl), cloud technologies, APIs, SAML, and OIDC. You will design, implement, and support infrastructure solutions for a global financial services organisation, handling PoCs, troubleshooting, root cause analysis, and integrations with teams across EMEA, North America, and Singapore.

Work with Cadence Virtuoso, Siemens Calibre, Keysight ADS, Python, Skill, Bash, and Perl to develop and maintain all EDA environments. You will manage EDA team resources and collaborate on tape-out and ASIC fabrication flows for a deep-tech company building quantum computing hardware and software.

Team Internet★4.2 (5)· London

Develop and maintain DNS architectures using Perl, Python, or Go, with DNSSEC and microservices. The role builds and sustains the backbone of Team Internet’s software services, collaborating with cross-functional teams to integrate DNS into new applications.

Work with modern C++, Python, Perl, Shell scripting, SQL, and machine learning libraries; also CUDA/GPUs, TCP/IP, UDP, git, and Linux/Unix. You will develop algorithmic trading solutions for financial markets at Jefferies.

LexisNexis Risk Solutions★3.8 (231)· London

You will use SQL, HTML, and at least two of PHP, Perl, Java, JSP/JSF, Ruby, JavaScript or ASP.Net to troubleshoot customer integrations, API policies, and web workflow issues for LexisNexis Risk Solutions’ SaaS risk-mitigation software. You join a 24x7 global support team.

JPMorgan★3.9 (20k)· London

Lead DevOps Engineer working with AWS, Kubernetes, Terraform, Linux, Python/Perl, Java, CI/CD (Jenkins, Jules), and automation tools. The role supports latency Electronic Trading, Data Analytics, and Quant environments within JPMorgan’s Global Electronic Trading Group.

RELX Group★3.8 (133)· London

You'll work with SQL, HTML, and at least two of PHP, Perl, Java, JSP/JSF, Ruby, Javascript, or ASP.Net to support LexisNexis Risk Solutions' SaaS platform for anti-money laundering, fraud detection, and identity verification. The role involves troubleshooting customer integrations, API configurations, desktop/mobile fingerprinting, and policy workflows as part of a 24x7 global support team requiring occasional overnight shifts and travel.

Point72★3.6 (15)· London

You'll work with large datasets using languages like Python, C++, Java, R, or MATLAB to preprocess data and build predictive models for market dynamics and systematic trading. Point72 is a quantitative investment firm applying advanced statistical learning to market prediction. This internship involves feature engineering and data validation for model estimation across a small team environment.

Point72★3.6 (15)· London

Cubist Systematic Strategies, Point72's affiliate, seeks quantitative researchers to develop statistical and predictive models for systematic trading across equities, futures, and foreign exchange using languages including Python, C++, Java, R, and MATLAB. Researchers will independently conduct rigorous research into market anomalies, managing methodology selection, data collection, backtesting, and performance monitoring. Candidates should have 3-7 years of alpha-driven quantitative research experience and advanced degrees in finance, computer science, mathematics, physics, or related quantitative disciplines.

Intercom★3.5 (4)· London

You'll build backend and frontend systems using high-level languages like Ruby or Python to power Fin, an AI customer service agent that resolves support issues across channels for nearly 30,000 businesses. As a Staff Engineer, you'll contribute to technical architecture and strategy while mentoring engineers, working closely with product managers and designers in a full-stack role that balances hands-on development with leadership responsibilities.

Intercom★3.5 (4)· London

You'll build backend and frontend systems using high-level languages like Ruby or Python for Fin, an AI customer agent that resolves complex support issues across channels. Leading strategic R&D initiatives, you'll mentor engineers, contribute to technical architecture for a scaling SaaS platform, and collaborate with product and design teams while balancing hands-on development with architectural leadership.

Apple★4.1 (14k)· London

You'll work with RTL simulation tools, Cadence tool chain, SystemVerilog/Verilog/VHDL, Python or Perl scripting, and Linux/grid computing systems. Apple's CAD Hardware Tech team automates chip design processes for products like iPhone, iPad, Apple Watch, and Apple TV; in this role you'll optimize simulation tool performance to reduce compute time and resource requirements for increasingly large chip designs, working with vendor and internal teams on methodologies and large-scale simulation debugging.

JPMorgan★3.9 (20k)· London

You'll develop ultra-low-latency C++ trading solutions using FPGA hardware acceleration on Unix/Linux platforms, integrating hardware pipelines with software stacks for market gateway and risk management systems. The Electronic Trading Technology team at JPMorgan Chase builds market-leading solutions powering high-speed trading across global markets, requiring deep expertise in multithreading, TCP/IP networking, and hardware-software integration.