1 to 25 of 80 Open Source Jobs in the South East

s your chance to take full ownership of frontend projects from design to delivery with minimal supervision! About Ballerine Ballerine is a high-growth, early-stage startup building an open-source platform for identity verification and risk management in the financial sector. It’s a fast-paced team preparing for Series A funding — and looking for a Senior … in React, TypeScript, modern frontend frameworks and architectures • Strong understanding of state management, performance optimization, and scalable component-driven design • Experience with testing frameworks (Jest, Cypress, Playwright) • Comfort with open-source principles and contributions • Clear, confident communication in English (minimum C1, no heavy accents) • Ability to onboard quickly and deliver at startup pace • Proactive, independent, and ownership-driven … Chance to join a core team pre-Series A, shaping the product and the company’s direction • Work on complex, high-scale challenges with cutting-edge tools (LLMs, AI, open-source) • A culture where your voice matters — small team, high impact, no bureaucracy • Opportunities for technical leadership and direct influence on strategy • Fully remote role Responsibilities • Architect, develop More ❯

component, functional, system integration and regression tests. - Experience working with Git on small to medium sized teams. - Experience designing and developing REST APIs for high volume clients. - Experience with open-source frameworks is a plus especially maintaining or contributing to open source projects! - Experience with container and container orchestration technologies, such as Docker and Kubernetes. - Comfortable More ❯

component, functional, system integration and regression tests. - Experience working with Git on small to medium sized teams. - Experience designing and developing REST APIs for high volume clients. - Experience with open-source frameworks is a plus especially maintaining or contributing to open source projects! - Experience with container and container orchestration technologies, such as Docker and Kubernetes. - Comfortable More ❯

practices, performs triaging of security issues, and implements fixes to deliver secure applications. Familiar with common software vulnerabilities and leading practices to mitigate. Should have some experience in researching open- source technologies for use in building systems and participate in open source communities as needed. Works on projects of moderate scope and complexity. Pro-actively identifies More ❯

frameworks such as TIBER-EU, DORA or STAR. Strong coding skills primarilly in C/C++, Rust or Python. Deep familiarity with C2 frameworks, OPSEC and extending commercial/open-source frameworks. Proven tool development or open-source contributions. Extensive knowledge of MITRE ATT&CK and red-team related security frameworks. Qualifications Red Team specific certs More ❯

to maintain and improve the core C++ codec integration layers. Integrate compression solutions, like VC6 and Point Cloud Compression, into different video editing and creation applications. Engage with the open-source community to contribute changes upstream to video player Open Source projects and assist in integrating LCEVC. Resolve defects within the codec integration layer and across More ❯

or a similar field. Desirable: Experience migrating monolithic architectures to modular or micro frontend systems Exposure to server-side rendering (SSR) or JAMstack frameworks (e.g., Next.js, Vite) Contributions to open-source projects, internal tooling, or frontend design systems Strong UX sensibility or history of close collaboration with UI/UX design teams Experience working within regulated, high-availability More ❯

infrastructure architecture is a plus. Understanding of modern authentication protocols such as OAuth2 and OIDC. Consideration of cross-cutting concerns like observability and security in infrastructure design. Contributions to Open Source projects are a plus. As an equal opportunity employer we welcome applications that reflect the diversity of our wider community. Please let us know at any time … being a nice person Truly flexible working hours - school pick up, volunteering, gym - no problem Generous leave - 27 days’ holiday plus bank holidays and enhanced family leave Transparent and open culture - you will be listened to and heard More ❯

Office/Remote Reporting to: Engineering Manager Job Purpose: We are seeking innovative Linux Systems Engineer to help shape the next generation of secure endpoint solutions. This role is open to both experienced engineers ready to tackle complex challenges and mid-level engineers eager to learn, grow, and innovate. You will work at the intersection of Linux internals, networking … C programming skills for low-level or performance-critical development. Experience with containerisation (Docker, Kubernetes). Familiarity with endpoint security, intrusion detection, or system hardening. Contributions to Linux or open-source projects. Experience with debugging, profiling, or performance optimisation tools. Why Join Us Shape the future of secure endpoint technology. Work on high-impact projects for global, high More ❯

of Product Operating Model Knowledge of Infrastructure as a Code tooling (Chef is essential, Ansible is a plus), containerization knowledge of authentication and biometric system design is highly desired. Open-source experience You may be assessed on the key critical skills relevant for success in role, such as risk and controls, change and transformation, business acumen strategic thinking More ❯

of Product Operating Model Knowledge of Infrastructure as a Code tooling (Chef is essential, Ansible is a plus), containerization knowledge of authentication and biometric system design is highly desired. Open-source experience You may be assessed on the key critical skills relevant for success in role, such as risk and controls, change and transformation, business acumen strategic thinking More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

and familiarity with working in technology-driven organisations or start-ups Experience with Kafka, Cassandra, gRPC, and microservices architecture will also be beneficial, as well as experience contributing to open-source projects If you're a passionate GoLang Developer seeking a challenging and rewarding contract role with a reputable tech company, apply now! Our client is looking to More ❯

engineering teams to streamline developer workflows. Ensure scalability, security, and usability of the developer portal. Provide technical guidance, documentation, and training for engineering teams adopting Backstage. Contribute to Backstage open-source ecosystem (where applicable). Profile The Spotify Backstage Developer will have strong experience in TypeScript/JavaScript (React knowledge highly desirable). Experience working with Spotify Backstage More ❯

Proven track record of delivering and maintaining real-time embedded systems in C/C++ Strong programming skills in C and C++. Solid understanding of embedded Linux development and open-source toolchains. Knowledge of common communication protocols, including TCP/IP, UDP, RS-485, SPI, and I2C Desirable: Experience developing embedded firmware on Linux-based systems. Familiarity with More ❯

ForgeRock COTS based IAM solutions (PingGateway, PingAM, PingIDM, PingDS) with embedded security gates, HTTP header signing, access token and data at rest encryption, PKI based self-sovereign identity, or open source You may be assessed on the key critical skills relevant for success in role, such as risk and controls, change and transformation, business acumen strategic thinking and More ❯

ForgeRock COTS based IAM solutions (PingGateway, PingAM, PingIDM, PingDS) with embedded security gates, HTTP header signing, access token and data at rest encryption, PKI based self-sovereign identity, or open source You may be assessed on the key critical skills relevant for success in role, such as risk and controls, change and transformation, business acumen strategic thinking and More ❯