Software Engineer IV
Remote
London, United Kingdom
Full Time
23-04-2025
Job Specifications
HackerOne is the global leader in human-powered security, harnessing the creativity of the world’s largest community of security researchers with cutting-edge AI to protect your digital assets. The HackerOne Platform combines the expertise of our elite community and the most up-to-date vulnerability database to pinpoint critical security flaws across your attack surface. Our integrated solutions, including bug bounty, pentesting, code security audits, spot checks, and AI red teaming, ensure continuous vulnerability discovery and management throughout the software development lifecycle. Trusted by industry leaders such as Coinbase, General Motors, GitHub, Goldman Sachs, Hyatt, PayPal, and the U.S. Department of Defense, HackerOne was named a Best Workplace for Innovators by Fast Company in 2023 and a Most Loved Workplace for Young Professionals in 2024.
HackerOne Values
HackerOne is dedicated to fostering a strong and inclusive culture. HackerOne is Customer Obsessed and prioritizes customer outcomes in our decisions and actions. We Default to Disclosure by operating with transparency and integrity, ensuring trust and accountability. Employees, researchers, customers, and partners Win Together by fostering empowerment, inclusion, respect, and accountability.
Software Engineer IV
Remote Location: London, UK
Position Summary
As a Senior Software Engineer, you will work with Product Managers and Designers to be the lead for a variety of challenging projects and build features and products for our community and the thousands of companies that trust HackerOne with their cybersecurity posture. When you are not leading a project, you are a collaborative and effective senior engineer and team member.
You combine broad technological expertise, deep domain knowledge, and an unquestionable dedication to business objectives as you intersect with the engineering organization. You seek leadership responsibilities, identify and drive new initiatives, and make systematic improvements to technical weaknesses they find in their squad’s codebases, as well as in shared codebases across the company.
What You Will Do
Your first month will be spent getting to know our company and your fellow HackerOnies through our well-organized and fun onboarding process called H.A.T.C.H. You will be setting up your development environment, getting a feel for our engineering processes, and embarking on a journey to fully understand the domain you will be working with.
By day 30 you will have met most of your fellow Engineering HackerOnies, you will have paired with other Software Engineers, you will have a strong feel for our codebases and products, and will be prepared to start hands-on coding.
By day 60 you’ll be involved in building a meaningful part of one of the projects and you will have become more connected with our team and various stakeholders.
By day 90 you’ll have impressed your colleagues with your technical contributions, and you’ll have earned trust and credibility within your squad and the whole Engineering team, presenting your progress during our review/demo sessions.
Your experience from here is yours to own. You could lead an important new project and work hand-in-hand with our principal engineer and designers. You could innovate during a Hack Week, by building something amazing that solves a problem for another team.
Long term, you will:
Work as a project lead together with stakeholders, designers and product leaders
Build, ship and maintain highly-available, performant and durable features
Work with your team to deliver key results for impactful objectives
Be a part of cross-squad initiatives
Mentor and be mentored by other engineers
Minimum qualifications:
5+ years of experience in full-stack software engineering, especially within a SAAS environment.
Experience developing applications with Ruby on Rails, Python, or other object oriented languages
Preferred Qualifications
Preferable experience or interest in generative AI, Elasticsearch / OpenSearch, GraphQL
Compensation Band: 80-105k GBP
Job Benefits:
Health (medical, vision, dental), life, and disability insurance*
Equity stock options
Retirement plans
Paid public holidays and unlimited PTO
Paid maternity and parental leave
Leaves of absence (including caregiver leave and leave under CO's Healthy Families and Workplaces Act)
Employee Assistance Program
Flexible Work Stipend
Eligibility may differ by country
We're committed to building a global team! For certain roles outside the United States, U.K., and the Netherlands, we partner with Remote.com as our Employer of Record (EOR).
Employment at HackerOne is contingent on a background check.
HackerOne is an Equal Opportunity Employer in the terms and conditions of employment for all employees and job applicants without regard to race, color, religion, sex, sexual orientation, age, gender identity or gender expression, national origin, pregnancy, disability or veteran status, or any other protected characteristic as outlined by international, federal, state, or local laws.
This policy applies to all HackerOne employment practices, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, compensation, benefits, training, and apprenticeship. HackerOne makes hiring decisions based solely on qualifications, merit, and business needs at the time.
For US based roles only: Pursuant to the San Francisco Fair Chance Ordinance, all qualified applicants with arrest and conviction records will be considered for the position.
About the Company
HackerOne is the global leader in human-powered security, harnessing the creativity of the world’s largest community of security researchers with cutting-edge AI to protect your digital assets. The HackerOne Platform combines the expertise of our elite community and the most up-to-date vulnerability database to pinpoint critical security flaws across your attack surface. Our integrated solutions, including bug bounty, pentesting, code security audits, spot checks, and AI red teaming, ensure continuous vulnerability discovery... Know more
Related Jobs
- Company Name
- Citi
- Job Title
- Java Developer - Equity Finance - VP
- Job Description
- What We Do / The Team The Equity Finance Technology team are seeking a development role for the Trading application, located in London. The role requires working with technologists across geographical locations and executing on the technical delivery. This role requires strong expertise in Java and the ability to work with traders in building business solutions through agile delivery. Responsibilities: Resolve variety of high impact problems/projects through in-depth evaluation of complex business processes, system processes, and industry standards Provide expertise in area and advanced knowledge of applications programming and ensure application design adheres to the overall architecture blueprint Utilise advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation Develop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goals Provide in-depth analysis with interpretive thinking to define issues and develop innovative solutions Serve as adviser or coach to mid-level developers and analysts, allocating work as necessary Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgement regarding personal behaviour, conduct and business practices, and escalating, managing and reporting control issues with transparency. Qualifications: Extensive experience system analysis and in programming of software applications Experience in managing and implementing successful projects Subject Matter Expert (SME) in at least one area of Applications Development Ability to adjust priorities quickly as circumstances dictate Key Skills And Experience Required Extensive development experience Proven Technical skills in Java, Kafka, SQL, Git Experience in performing QA Proven ability to work in high pressure environment Flexibility to work with a global team, across geographies and time zones Strong problem-solving skills and ability to think strategically Familiarity with agile methodologies. Excellent interpersonal and communication skills with the ability to manage stakeholder expectations Any Beneficial / Nice to have skills and experience: React and full stack development Knowledge of Prime Services is a plus Bachelor's or Master's degree in Computer Science, Information Technology, or related field. This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required. What We’ll Provide You By joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as: 27 days annual leave (plus bank holidays) A discretional annual performance related bonus Private Medical Care & Life Insurance Employee Assistance Program Pension Plan Paid Parental Leave Special discounts for employees, family, and friends Access to an array of learning and development resources Visit our Global Benefits page to learn more. Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive. ------------------------------------------------------ Job Family Group: Technology ------------------------------------------------------ Job Family: Applications Development ------------------------------------------------------ Time Type: Full time ------------------------------------------------------ Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law. If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi. View Citi’s EEO Policy Statement and the Know Your Rights poster.
- Company Name
- Spinks
- Job Title
- Senior Python Developer
- Job Description
- Python masters, we need your magic I am looking for Senior Python Developers based in the Leeds area to join an exciting consultancy as they continue to grow. In this role, you will serve as a Senior Consultant to deliver expert guidance on software engineering practices both internally and external with clients. Skills and experience that you need: *5+ years Python experience *Experience in AWS Serverless (Lambda, DynamoDB ect.) *Proficient in designing and developing both native and web applications *Previous experience of working for Consultancy/ Public Sector would be highly desirable What they offer: *Salary range - £50-70k p/a *Hybrid Working model – Up to 2 days in the Office/ On-site *25 days Annual Leave + Bank Holidays *Perkbox access for wide range of discounts *Private Health & Dental Insurance *Attractive Pension Scheme Apply now for immediate consideration!
- Company Name
- Simple Machines
- Job Title
- Senior Software Engineers - Full-stack
- Job Description
- Simple Machines is a leading independent boutique technology firm with a global presence, including teams in London, Sydney, San Francisco, and New Zealand. We specialise in creating technology solutions at the intersection of data, AI, machine learning, data engineering, and software engineering. Our mission is to help enterprises, technology companies, and governments better connect with and understand their organisations, their people, their customers, and citizens. We are a team of creative engineers and technologists dedicated to unleashing the potential of data in new and impactful ways. We design and build bespoke data platforms and unique software products, create and deploy intelligent systems, and bring engineering expertise to life by transforming data into actionable insights and tangible outcomes. We engineer data to life™. As a Senior Software Engineer at Simple Machines, you'll be at the heart of groundbreaking projects, collaborating closely with both our talented internal team and forward-thinking clients. In this hands-on role, you'll drive the development of sophisticated, scalable solutions across the full technology stack—from intuitive frontends and robust backends to powerful data pipelines and resilient infrastructure. If you're passionate about solving complex problems and pushing the boundaries of what's possible, this role offers the perfect platform for you to make a real impact. About our incredible team: We believe diverse perspectives fuel innovation. Our team is made up of talented engineers from different backgrounds, each bringing unique strengths. We collaborate across the full stack, supporting and learning from one another to create world-class solutions. You'll have the autonomy to shape technical design, work closely with stakeholders, and engage with data scientists and cross-functional teams to craft seamless, high-performance systems. We're committed to fostering an inclusive and equitable workplace where everyone—regardless of background, identity, or experience—can thrive. If you're passionate about pushing boundaries, solving complex challenges, and being part of a forward-thinking team, we want to hear from you! Technical Responsibilities: Responsible for design and technical development of backend services for a highly scalable marketing platform Responsible for designing the APIs, applications, and infrastructure the team develops, and documenting the technical requirements and design for the client Responsible for end-to-end delivery and support, including build, automation, deployment, and operations, for everything that is developed Partner with client stakeholders, and team members, to gather business requirements, collaborate on design decisions, and translate them into technical and design requirements Operate within an iterative delivery team using Agile delivery tools and practices Hybrid remote and in-person collaboration with the delivery team and client stakeholders Requirements Technical background A consultative approach to software development. (Ideally experience in the Software Consulting space) Core foundation in programming, especially in JVM languages (particularly Kotlin or Java) Experience designing and implementing data-driven APIs Exposure to frontend development (particularly React.js, Tailwind, REDUX, Typescript) Past project experience with large scale webservices Cloud infrastructure experience with AWS and/or Google Cloud, Azure, etc Infrastructure-as-code experience, such as with Terraform or Cloud Formation In-depth experience with unit and integration testing, and test automation generally. Ideally TAA and/or BDD Experience working with SQL databases in the context of implementing data-driven APIs, and designing database schemas and queries to meet business requirements A passion and proven background in picking up and adopting new technologies on the fly Exposure to Scala, or functional programming generally Exposure with highly concurrent, asynchronous backend technologies, such as Ktor, http4k, http4s, Play, RxJava, etc Exposure with DynamoDB or similar NoSQL databases, such as Cassandra, HBase, BigTable, or Cosmos DB Exposure with Git workflows, and the ability to tailor the workflow to project needs Exposure with containerised application deployment using Docker, Amazon ECS, Kubernetes, etc
- Company Name
- Revolution Technology Ltd
- Job Title
- Frontend Developer
- Job Description
- Mid-Level Frontend Engineer (React) I'm looking for a Frontend Engineer to join a fintech start up that are automating underwriting and making it less complex! This is a mid level position and a great opportunity to grow and develop within the team. The Role: Develop scalable Frontend systems using Typescript, React and Next Convert Figma designs from code Take full ownership of end to end development They are looking for: Minimum 2 years commercial experience Experience with React, Next, Figma & Typescript Experience in start-up environments Ideally fin tech experience Key Details: Location: Fully remote, UK/Europe Salary: £45k-£55k Tech stack: React, Next, Figma, Typescript, Tailwind Please apply for more details!