Careers

Who Are CSL Looking For?

CSL are looking for an experienced solution architect who excels in solution design, converting requirements into logical diagrams and flows, and creating detailed implementation blueprints. Who has experience in translating business needs into technical solutions, ensuring that all components are integrated and aligned into the overall architecture. The ideal candidate will have a strong background in designing scalable and efficient systems, analytical skills, and the ability to collaborate with a range of technical/non-technical stakeholders to define high-quality solutions.

The Role:

The Solution Architect is responsible for defining technology solutions that understand business goals, product requirements, the technology landscape, strategy, standards and future approaches.

The role holder leads the design of new systems, defines the architecture, shapes processes, automation, tools and delivery frameworks to facilitate the development and deployment of high-quality solutions that are easy to operate, scale and secure in a fast-paced, agile environment.

The role holder delivers target architecture blueprints, technical improvement roadmaps, defining logical flows, interactions between systems, protocols/contracts and mitigating technical debt. Then, facilitates clear communication, discussions, interpretations and implementations across Engineering Leads and Product teams on various approaches, manging any disagreements.

Key Responsibilities:

People

• Provide technical knowledge and insight to peers on the art of the possible and likely constraints.
• Ability to guide others in the creation of solutions that align to architecture definitions and apply necessary commercial constraints to remain within wider strategic goals.
• Ensuring that requirements from Product are understood by Engineering Leads, that end-to-end solution approaches consider all aspects and able to combine output from different teams into cohesive solutions.
• Provide ongoing engagement with stakeholders, colleagues and customers to understand their current needs, approaches and challenges to then identify and ensure their needs are considered in solutions.
• Communicate the capabilities, constraints and opportunities available in existing solutions to product owners/managers to facilitate change on the backlog (such as technical debt mitigation).
• Lead discussions along with; acting as a technical advisor to; stakeholders, engineers, product owners / managers ensuring alignment between technical and business objectives is understood and adhered to.

Process

• Develop end-to-end architecture designs for software, systems, and platforms.
• Ensure the creation of solution architecture blueprints for backlog items that includes logical architectures, flows, compliance with standards, integrate with other systems and outlines for technology approaches.
• Communicate and clarify the overall solution architecture with engineering teams and ensure consensus and maintain an accurate record of those solutions and any changes are appropriate.
• Ensure that all documentation is accurate and aligned with the final implementation collaborating with Engineers on required changes to maintain documentation to the required standards.
• Reviewing implementations from engineering teams to evaluate alignment with the architecture blueprints making changes, challenges, critiques and compromises as required.
• Facilitating taking a vison to an idea to reality via the creation of prototypes, spikes, hackathons, incubation of emerging technologies and other experimentative approaches to test and evaluate blueprints and the viability of concepts and ideas on the backlog before they are committed and prioritised.
• Evaluate existing solutions (includes legacy from acquisitions) on their fit for purpose, future support, and make recommendations for mediation, improvements, replacements and general lifecycle management.

Technology

• Ensure all proposed solutions are aligned to standards, scalable, reliable, secure, and cost-effective; designed for security, maintainability and long-term sustainability.
• Ensure that data architecture, data modelling, and data structures are carefully designed to support scalability, efficiency, and accuracy; align with industry standards, and facilitate seamless integration across systems. Evaluate data frameworks to ensure they meet evolving business and technical requirements.
• Stay up to date on technology changes within the industry and wider to ensure solution approaches can utilise the best options for CSL.
• Ensure the technical debt list is evaluated and that there are sunset and remediations plans as required.
• Continually review and provide constructive feedback on the team’s technical implementations including evaluating existing code and provide critiques and improvements.
• Ensure that technology standards are current, identifying and proposing changes for consideration.

Ideal experience and knowledge:

• Experience of successfully leading the architecture projects which transform technology and business processes within your area of expertise.
• Data and evidence-based approach to decision making with a creative and driven approach to problem solving that combines technical knowledge and business needs.
• Able to convey complex information across multiple audiences, communicate enthusiastically and motivate others by adapting your style to fit the audience.
• Aware of the financial and business implications of your architecture choices.
• Experience as either a Solution Architect or Solution Designer leading on technology change.
• Proficient in a range of technologies – such as cloud, platform engineering, API development, message bus, workflow engines etc; and development languages such as C/C++/C#.Net/Python/PHP.
• Experience in working in a DevOps environment, alongside QA and automation.

The above should not be viewed as an exhaustive list of skills and/or qualifications but rather CSLs view on the ideal candidate. If you feel you can meet three quarters or more of the requirements and learn the rest with support from CSL please apply now with an indication of your salary expectations for the role.

CSL operates as an equal opportunities employer and we welcome all applications regardless of gender, race, disability, sexual orientation, religion or belief, age, gender reassignment, marital or civil partnership status, pregnancy or maternity.

Who Are CSL Looking For?
To be a successful Principal Software Engineer you must have significant domain knowledge, not be fazed by any problems when facing into the unknown. Any ticket on the backlog you are expected to be able to pick up and implement in a timely way that meets or exceeds the quality expectations, standards and business value goals.

The Role:
Software Engineers are responsible for engineering all of the systems, products and services that power CSL.

This means being responsible for the software design, code implementation, test coverage and operation of effective software and supporting toolsets within specific business and technology domains.

The role holder spends their time Exploring, Investigating, Developing, Enhancing and sometimes Decommissioning our provided Tools, Product and Services all with the aim of delivering the backlog, roadmap and overall corporate strategy with their success being measured by outcome value achieved and alignment to the agreed priorities.

This involves translating requirements into quality (meet required metrics) technical solutions then creating code for products and services adhering to our engineering standards that’s maintainable, supportable and with minimal risk to operate and able to be deployed safely into a production environment for use by customers and colleagues.

The Principal Software Engineer is the top of the Individual Contributor within the engineering track at the CSL and as such ensure software deliverables meet quality standards and are delivered effectively. They are the go-to person within their Centre of Excellence for tricky implementations; any problem should be easily resolvable by a Principal Engineer. They intimately know the design, topology, methodology and wellbeing of their centre of excellence and can help, guide and support all other engineers on achieving successful outcomes.

Key to being successful is being responsible for creating a diverse, inclusive, and welcoming environment. It is essential to ensure that everyone feels supported to be their authentic self, can grow, develop, and positively contribute to delivering value.

Key Responsibilities:
People

• Leadership of the engineering change within their centre of excellence able to guide and support other software engineers in problem solving, code implementation issues and related challenges.
• Able to work in close partnership with others – Heads of Engineering, Solution Architect, Technical Programme Manager and Leads to help to shape the engineering approaches, share knowledge and their experience.
• Able to influence colleagues in a range of different approaches to solve problems to gain wider or better results and/or drive bigger benefits.
• Able to review code output and make constructive suggestions for future improvements.
• Represent CSL externally at conferences, panels and industry events to ensure that CSL is viewed as the leading innovator within the engineering / signalling industry.
• Act as a thought leader – the principal point of contact for expertise on software issues, industry trends on developing technologies within their Centre of Excellence and seen as a role model, exemplar of demonstrating the CSL values.

Process

• Accountable for resolving technical conflict when it arises able to balance a range of different viewpoints and perspectives then apply their domain knowledge to provide guidance and support to their Engineering Lead when making decisions.
• Guiding and developing, senior, mid-weight and associate team members through general guidance on best practices in order to ensure the development of world-class software.
• Can take any task from the backlog and can shape, then break them down into defined, implementable tasks/sub-tasks that align to CSL’s Technology Standards and meet the Definition of Done/Story/Epic’s Acceptance Criteria.
• Routinely pairs with others along with reviewing and giving constructive feedback on others’ code.
• Review and writes tests using automated test-driven techniques to ensure code quality and future reliability.
• Provide frequent and accurate updates on ticket progress, expected timelines, work level outstanding, dependencies, risks, issues and duration spent to Delivery Programme Managers.
• Is accountable for documentation accuracy and writes, updates and reviews all domain documentation.
• Comfortable to contribute in group discussions/workshops on design and technical models, articulating contexts and boundaries and the rationale behind them, shaping the wider application landscape and identifying risks.
• Lead troubleshooting and resolution of issues throughout the product life cycle, including providing out-of-hours support for incident resolution and performing root cause analysis.

Technology

• Skilled with full understanding of the systems delivered, technologies utilised, and approaches taken within their domain (Centre of Excellence).
• Has understanding and can provide context on historical choices and can rationalise and validate future decisions along with highlighting risks or areas that now require re-engineering.
• Work closely with Product to understand and translate roadmap items and needs into improvements in the domain, translating requirements into tasks and code and developing high-quality code that can lead to rapid delivery. This includes owning the scope, shape and prototyping aspects of technical implementations.
• Apply in-depth knowledge of multiple programming languages, associated frameworks, and the respective tool ecosystem to create elegant solutions to problems.
• Adopt new languages and new paradigms and produce proof of concepts to evaluate new tools, applying them to the problem domain where they deliver significant benefit.
• Continually learning and maintaining knowledge of the industry and competitor developments.

Ideal Experience and Knowledge Sought:

• Demonstratable experience designing, and building distributed systems, for scalability, availability and performance and running whole system landscapes.
• Experience acting as a technical authority within a domain that uses multiple technologies.
• A pragmatics and viable track record of delivering large-scale, well architected complex solutions at pace.
• Confidently and competently share knowledge to other users, customers, and other team members.
• Strong understanding of running production systems in a secure, reliable and performant way.

The above should not be viewed as an exhaustive list of skills and/or qualifications but rather CSLs view on the ideal candidate. If you feel you can meet three quarters or more of the requirements and learn the rest with support from CSL please apply now with an indication of your salary expectations for the role.

CSL operates as an equal opportunities employer and we welcome all applications regardless of gender, race, disability, sexual orientation, religion or belief, age, gender reassignment, marital or civil partnership status, pregnancy or maternity.

Who Are CSL Looking For?

We are looking for an experienced Proposal Manager with strong bid writing and coordination skills, and the confidence to handle technical material. This hybrid role combines hands-on writing with bid management, ensuring we deliver high-quality, competitive responses to RFPs, RFIs, and tenders.

You will work across teams including Sales, Business Development, Product, Engineering, Commercial, and Finance to produce proposals that bring our SIM technologies to life. Success in this role means writing responses that are accurate, persuasive, and enjoyable to read: capturing technical detail while keeping a clear, human voice.

In some cases, you will also support operator bid teams when they incorporate rSIM into their proposals, providing input, coordination, and technical material to ensure rSIM is positioned well. Each bid is unique. Success in this role means going beyond reusing content: it is about tuning into the customer’s language and priorities and shaping our response so it directly reflects their needs and evaluation criteria.

Duties & Responsibilities:

This role will encompass a range of responsibilities including but not limited to:

During Active Bids (RFPs, RFIs, Tenders):

• Lead the end-to-end bid process, from opportunity qualification through to submission
• Write and edit clear, persuasive responses that capture technical inputs in a way customers
  understand
• Coordinate contributions from Sales, Product, Engineering, Commercial, and Finance teams,
  ensuring deadlines and compliance requirements are met
• Support operator bid teams when they incorporate rSIM into their proposals, providing input,
  coordination, and technical material to ensure rSIM is positioned well
• Develop diagrams, solution descriptions, and value propositions that differentiate rSIM from
  competitors
• Analyse RFPs and RFIs to identify gaps, ambiguities, and opportunities, and frame strategic
  clarification questions that give us an edge
• Manage review cycles and sign-offs, ensuring proposals are accurate, consistent, and tailored
• Support bid presentations and clarifications where written responses extend into oral defence
  stages

During Non-Bid Periods:

• Build and maintain a knowledge base of case studies, technical explanations, and compliance
  documents, while ensuring all responses are tailored to each opportunity
• Work with Sales and Business Development to maintain a pipeline tracker of upcoming
  opportunities and ensure pre-qualification requirements are in place
• Collaborate with Product and Engineering to capture technical detail and turn it into customer-
  ready material
• Research competitor positioning, market developments, and regulatory changes to strengthen
  future responses
• Support Marketing in producing thought leadership, white papers, and case studies that can
  also be used in bids
• Support the sales team in using Proposify for smaller, routine offers, ensuring responses are
  clear, consistent, and aligned with rSIM messaging

We are looking for someone who is:

• A natural writer who takes pride in producing well-structured, engaging, human responses
  rather than relying on generic AI content
• Skilled at adapting writing style to reflect the customer’s language, priorities, and evaluation
  criteria
• A strategic thinker who can read between the lines of RFPs, asking smart questions that
  uncover customer priorities and create opportunities f or differentiation
• Detail-oriented, with a right-first-time mindset
• Resilient under pressure, with the ability to manage multiple deadline
• Flexible and adaptable, willing to work outside of standard hours when bids require fast
  turnaround (f or example, when partners such as T-Mobile provide short notice)
• Curious, proactive, and able to identify ways to continuously improve bid quality
• Comfortable switching between complex bids and smaller proposals in Proposify, keeping
  quality of writing high in both
• Comfortable in a hybrid role that blends technical writing, project coordination, and stakeholder
  management

Key Skills & Qualifications Sought:

• Proven experience as a Bid Writer, Proposal Manager, or Bid Manager within telecoms, IoT, or technology sectors

• Strong writing skills: able to translate complex technical inputs into clear, engaging responses

• Experience coordinating contributions from multiple stakeholders under tight deadlines

• Technical understanding of mobile connectivity, IoT, or telecoms (SIMs, eSIM, APNs, private networks)

• Excellent project management and organisational skills

• Commercial awareness and the ability to position solutions competitively

• Proficient in MS Office (Word, PowerPoint, Excel); experience with collaboration tools such as Teams, SharePoint, or Confluence is beneficial

• APMP qualification desirable but not essential

The above should not be viewed as an exhaustive list of skills and/or qualifications but rather CSLs view on the ideal candidate. If you feel you can meet three quarters of the requirements and learn the rest with support from CSL please apply now with an indication of your salary expectations for the role.

CSL operates as an equal opportunities employer and we welcome all applications regardless of gender, race, disability, sexual orientation, religion or belief, age, gender reassignment, marital or civil partnership status, pregnancy, or maternity.

Who Are CSL Looking For?

We are looking for a technically astute, commercially aware Solutions Architect support the growth of eSIM and rSIM in North America, CSL’s advanced SIM technologies designed for resilient, standards-based IoT connectivity. This remote-based, customer-facing role works across wireless carriers, channel partners, and enterprise customers to help scope, explain, and deliver solutions that solve real-world connectivity challenges.

As the primary technical point of contact for North America, you’ll guide customers through solution design, proof-of-concept, and technical onboarding. You’ll support our existing sales teams in the region, work closely with our wireless carrier partners, assist in RFIs and RFPs, and lead hands-on customer testing and validation. You’ll play a critical role in ensuring our SIM technologies deliver the resilience and reliability our customers expect, while feeding insights back into the broader product and engineering teams in Europe.

This is an opportunity for an enthusiastic, passionate, and self-motivated individual to become a vital part of the rSIM team. We’re looking for someone who can think independently, contribute creatively, and thrive in a supportive environment where continuous learning is encouraged.

You’ll need to be confident engaging with stakeholders at all levels, both internally and externally, and comfortable operating in an evolving, sometimes ambiguous environment. Success in this role will come from focusing on outcomes over process, staying curious, and being proactive in solving complex technical challenges. As you’ll be working on CSL’s latest connectivity innovations, it’s essential that you can translate technical insights into clear, actionable language that resonates with commercial, product, and technical audiences alike.

Duties & Responsibilities:

This role will encompass a range of responsibilities including but not limited to:

• This role will encompass a range of responsibilities, including but not limited to:
• Lead and manage device testing and validation, working with mobile network operators (MNOs) and customers to ensure rSIM and eSIM behaviour meets expectations across different modules, routers, and use cases
• Own and report on testing outcomes, feeding back technical challenges to both internal teams and external partners to help improve the solution
• Build and maintain a comprehensive knowledge base, working closely with peers in Europe to capture insights on rSIM, eSIM, connectivity behaviour, and deployment scenarios
• Provide technical expertise during customer engagements, supporting the sales team during pitches, meetings, and technical discussions
• Collaborate with mobile network operators on opportunities they bring to CSL, offering guidance on how rSIM can support their requirements
• Support onboarding of new operator partners by working closely with internal technical teams and external operator contacts
• Work cross-functionally with Product and Marketing teams, helping to translate customer requirements and use case feedback into product enhancements
• Travel is expected throughout USA, Canada, and on occasion internationally, including to CSL’s head office in London, UK.

Key Skills & Qualifications Sought:

• Strong understanding of the wireless carrier / mobile operator ecosystem, experience working with or for mobile network operators (MNOs) or connectivity platforms is essential.
• Familiarity with eSIM technologies, including GSMA standards such as SGP.02 and SGP.32, is highly desirable.
• Networking expertise including knowledge of APNs, VPNs, private IP schemes, NAT, and routing.
• IoT experience with a focus on customer requirements, deployment challenges, and connectivity needs.
• Minimum of 5 years’ experience in telecoms or mobile connectivity roles (pre-sales, solution engineering, product, or operations).
• A quick learner with a strong sense of ownership and a genuine hunger to be the best.
• Bachelor’s degree in a relevant technical or engineering discipline preferred. Experience working across internal and external technical teams to help bring a world-class product to market
• A right-first-time mentality with strong attention to detail
• Brings a high level of professionalism to an engaging, customer-facing role
• Seen as the technical expert, someone colleagues and customers trust to have the answer
• Skilled at extracting the right information from customers to diagnose and solve complex issues
• Brings empathy and humour, adapting communication style to suit different individuals and audiences
• Able to align cross-functional teams around a shared goal and drive progress
• Confident in clarifying requirements and status to ensure momentum and shared understanding

The above should not be viewed as an exhaustive list of skills and/or qualifications but rather CSLs view on the ideal candidate. If you feel you can meet three quarters of the requirements and learn the rest with support from CSL please apply now with an indication of your salary expectations for the role.

CSL operates as an equal opportunities employer and we welcome all applications regardless of gender, race, disability, sexual orientation, religion or belief, age, gender reassignment, marital or civil partnership status, pregnancy, or maternity.