Backend Java Developer - Innovative Startups in Berlin

Blackbird CollectiveBerlin

On-site Full-time

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Experience Level

Mid to Senior

Qualifications

At least 5 years of professional experience in backend development. Demonstrated history of creating production-quality software collaboratively. A strong passion for crafting clean, maintainable, functional, and testable code. Experience with Kotlin or Java; candidates without Kotlin knowledge are encouraged to apply and can learn it on the job. Proficient in both spoken and written English. A collaborative team player who can take initiative. Preferred Qualifications:Knowledge of Serverless technologies, Kotlin, AWS, Terraform, FaunaDB, Redshift. Experience in mobile application development. Previous experience working in a startup environment is a plus.

About the job

We are currently partnering with several cutting-edge startups in search of talented Backend Engineers to enhance their existing teams. Our reputation for delivering excellent candidates through referrals has established our clients as outstanding employers, offering the opportunity to work on exciting projects within dynamic international teams.

About Blackbird Collective

Blackbird Collective is a premier HR organization dedicated to connecting startups and established companies with talent that aligns with their current needs. We specialize in freelance and interim recruitment projects for clients throughout Germany, primarily focusing on those based in Berlin.

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Backend Java Developer - Innovative Startups in Berlin

Blackbird Collective

Full-time|On-site|Berlin

May 10, 2021

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Founding Backend Engineer (Go) at TechBizGlobal | Berlin

TechBizGlobal

Full-time|Hybrid|Berlin, Berlin, Germany

Join a pioneering cybersecurity and AI startup in Berlin!TechBizGlobal is on the lookout for a Founding Backend Engineer (Go) to be an integral part of our founding team, responsible for architecting the essential security, identity, and enforcement frameworks for our cutting-edge AI-driven security risk management platform.Founded by seasoned cybersecurity experts with roots in Israeli Intelligence, we seek a proactive Backend Engineer (Go) to take on a hybrid role based in the heart of Berlin. If you have a passion for cybersecurity and AI technology, excel in dynamic startup environments, and relish the challenge of building complex systems from scratch, this is your chance to make a significant impact.Our mission is to develop a next-generation cyber risk platform that empowers enterprises to comprehend, assess, and mitigate identity risks at scale. We aim to transform intricate identity and security data into straightforward, actionable insights that Chief Information Security Officers (CISOs) and Chief Technology Officers (CTOs) can rely on. From day one, you will collaborate on core platform components, influencing how modern organizations manage and interpret risk through cloud-native systems, AI analytics, and automated enforcement via AI agents.

Mar 13, 2026

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Senior Backend Developer at bitlane | Berlin

Bitlane

Full-time|On-site|Berlin

Join our dynamic and innovative team at bitlane as a Senior Backend Developer. We are seeking a passionate software engineer to contribute to our product development journey from conception to deployment and beyond. In this role, you will collaborate closely with project managers and frontend developers to ensure that we meet and exceed our project requirements. The ideal candidate will possess a deep understanding of software engineering principles and industry best practices, delivering clean, maintainable, and error-free code with robust test coverage. You will be responsible for writing automated tests, conducting code reviews, and taking end-to-end ownership of your projects. We value problem solvers with an inquisitive and innovative mindset, ready to leverage their software development skills to create new services. Your role will involve backend development across a variety of projects, ranging from small applications and single-page websites to comprehensive e-commerce systems and complex CRM solutions. If this resonates with your skill set, we look forward to receiving your application!Responsibilities:Collaborate with our software team to design and launch new featuresEnhance our product and codebase with your analytical insightsMaintain our systems at the cutting edge while developing our growing environmentExpand our existing web technology portfolioCreate new microservices using AWS and improve existing onesDevelop and maintain tools for software and data interactionDefine project scope in collaboration with project managersCommunicate your work status and meet deadlines established with project managers

Aug 17, 2020

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Senior Java Developer at SWARCO | Berlin

SWARCO

Full-time|On-site|Berlin

Join our innovative team at SWARCO as a Senior Java Developer in Berlin. In this pivotal role, you will be responsible for designing, developing, and maintaining high-quality software solutions that drive our projects forward. Your expertise in Java programming will be crucial in crafting robust applications that meet the needs of our clients.

Apr 1, 2026

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Senior Java Backend Engineer (m/f/x)

atolls

Full-time|Hybrid|Berlin

Atolls is the world’s largest community-driven shopping platform, active in over 20 markets.We empower millions to make informed spending choices across discovery, evaluation, and (re-)purchase by connecting individuals with the ideal brands and retailers.Our team of 1,000+ members across 10 countries develops products utilized daily on a global scale, providing you with genuine ownership and the chance to witness your impact. Are you ready to help shape the destinations people trust for confident shopping? We invite you to learn more.About This Role:We are on the lookout for a Senior Java Backend Engineer to become an integral part of our expanding engineering team in Berlin. In this pivotal role, you will be responsible for designing, developing, and scaling high-performance backend systems utilizing contemporary Java technologies and cloud-native architectures. This position is perfect for individuals who thrive on tackling complex systems, prioritize code quality, and possess a robust architectural mindset.Our Benefits:At Atolls, we are committed to fostering both your professional and personal development. Here’s what you can look forward to:A culture that champions personal and professional growth, alongside opportunities for internal mobility.A supportive and open-minded team that welcomes diverse perspectives and innovative concepts.32 days of paid vacation plus an additional day off for your birthday, ensuring you have ample time to recharge.A flexible hybrid working model to help you find the right balance between work and life.Access to a learning budget and internal training to enhance your skills in your role.Mental health coaching to promote your well-being.Regular global and local gatherings to celebrate achievements and strengthen connections.The chance to take a sabbatical after three years with the company.A cloud-based company setup, allowing flexibility and collaboration regardless of your location.*These are global benefits applicable to all employees, with additional local perks based on your location.Responsibilities:As a Senior Java Backend Engineer, you will...

Apr 7, 2026

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Operations Manager - Recent Graduate for Innovative SaaS Startup in Berlin

HeavenHR

Full-time|€50K/yr - €70K/yr|Remote|Remote — Berlin, Berlin, Germany

Join HeavenHR, a cutting-edge SaaS startup in the HR sector, as we seek a dynamic and talented recent graduate or entry-level professional to enhance our Operations Management team. Our mission is to optimize and simplify human resource management, providing companies with a comprehensive platform that integrates all HR processes. In this pivotal role, you will lead the Operations team in a fast-growing startup and play a significant part in revolutionizing the HR industry.As an Operations Manager, you will be responsible for effectively managing and optimizing all business aspects. You will oversee and streamline processes related to sales, finance, payroll, insurance distribution, customer experience, and other functions to ensure smooth operations and support future growth. Additionally, you will collaborate with various departments to drive continuous improvements and provide an outstanding customer experience.

Jun 6, 2025

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Backend Engineer (FastAPI) at almedia | Berlin

almedia

Full-time|On-site|Berlin

Join almedia as a Backend Engineer specializing in FastAPI. In this role, you will be responsible for developing and maintaining robust backend services that power our innovative digital solutions. Collaborate with cross-functional teams to create scalable applications that enhance user experiences.

Mar 5, 2026

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Senior Backend Engineer at reliant-ai | Berlin

reliant-ai

Full-time|On-site|Berlin, Berlin, Germany

About the RoleWe are on the lookout for two highly skilled backend engineers to join our dynamic team in Berlin. You will be instrumental in advancing the development and implementation of our technology, enhancing our capacity to create core backend functionalities, and empowering other teams to utilize this backend for their projects.If you have a passion for creating exceptional products, thrive in a fast-paced environment, and are eager to contribute to the success of an ambitious startup, this is the perfect opportunity for you.Our Tech Stack:Python / FastAPIPostgreSQL / MongoDB / ElasticCloud LLM providers + bare metal GPUsGCPAs an early team member, you will assume significant responsibilities from day one, with the chance to influence our technological architecture and infrastructure.Join one of the most ambitious AI companies today, collaborating with a world-class team of experts in their fields, and experience an incredibly stimulating work environment. In This Role You WillLead the delivery of complex projects, coordinating with cross-functional teams, and ensuring timely completion of essential components.Develop a deep understanding of Reliant's vision and integrate this into your architectural and process decisions in daily operations.Offer insights to refine UI/UX concepts and assist in the planning of backend and infrastructure development.Take proactive responsibility for long-term code quality and architecture. About YouThe ideal candidate will have a proven track record in backend or full-stack development, with a focus on rapid innovation and effective systems design that supports growth opportunities for both the product and the team.To thrive in this role, you should possess the following skills and experiences:5+ years of demonstrated experience in building backend services or distributed systems.Ability to design, develop, test, and maintain backend services and APIs that support product features, including writing robust, production-quality code.Engage in system and service design; contribute to architectural discussions and make informed trade-offs regarding scalability, latency, cost, and reliability.Navigate ambiguity effectively; translate vague or high-level requirements into actionable implementation plans.Collaborate with cross-functional partners including product management, frontend, UX, data, and operations to define requirements, plan implementations, and deliver features.Ensure high code quality by writing, reviewing, and improving unit/integration tests; actively participate in code reviews.

Oct 21, 2025

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Senior Backend Developer / IT Consultant (m/f/d)

god

Full-time|On-site|Berlin, Berlin, Germany

As an established IT service provider, we create modern, scalable software solutions for clients across various industries. We leverage the latest technologies, agile methodologies, and a passionate team dedicated to crafting digital products. We are looking to strengthen our team with experienced Senior Backend Developers / IT Consultants (m/f/d) who love technological diversity, enjoy holistic problem-solving, and provide competent consulting to our clients.You will develop end-to-end solutions that deliver real value to our clients while actively designing microservices and modern software architectures.You will build and operate high-performance backend services using Java or Kotlin, utilizing Spring Boot for complex software implementation, and reliably integrating databases and external interfaces.You are committed to high software quality, employing automated testing and clean code principles.You will confidently guide clients through architecture, technology, and implementation questions, translating technical concepts into understandable terms.You will collaborate closely with UX/UI designers, product owners, and developers from other disciplines, actively contributing to agile teams.You will conduct code reviews, provide constructive feedback, and ensure adherence to best practices, architectural guidelines, and high code quality within the team.

Dec 17, 2025

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Backend Engineer in Berlin

airapps

Full-time|On-site|Berlin Metropolitain Area

About the Role airapps is looking for a Backend Engineer to help shape backend systems for our applications. This position is based in the Berlin Metropolitan Area. What You Will Do Design and build backend systems that support our products Focus on scalability and performance throughout development Location Berlin Metropolitan Area

Apr 16, 2026

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Founding CTO/CPTO for Innovative Cybersecurity & AI Startup

techbizglobal

Full-time|Hybrid|Berlin, Berlin, Germany

Join Our Team in Berlin • Cutting-Edge Cybersecurity & AI Startup • Recently Secured Major FundingAt techbizglobal, we are creating a revolutionary Identity + AI Enforcement platform in Berlin.With our newly acquired funding, we are seeking a technical co-founder who will take charge of architecting and developing our core product from the ground up.We are in search of a forward-thinking Founding CTO/CPTO for a dynamic hybrid role based in Berlin. If you have a fervor for deep technology, excel in fast-paced settings, and possess a robust background in building transactional platforms, this is your chance to create a substantial impact.

Feb 10, 2025

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Java Software Engineer at 1GLOBAL | Berlin

1GLOBAL

Full-time|On-site|Berlin, Berlin, Germany

Join Our Innovative Team at 1GLOBALAt 1GLOBAL, we are redefining mobile connectivity on a global scale. As a leading technology-driven mobile communications provider, we deliver seamless connectivity solutions for both enterprises and consumers. Our advanced telecom platform, featuring our proprietary global mobile core network and in-house developed eSIM technology, empowers us to operate as a fully regulated telecommunications provider across 40 countries worldwide.We partner with some of the world’s premier banks, enterprises, and digital-first businesses, including neo-banks and global consumer goods companies. With over 70 million connections, we enable our clients to innovate and scale their operations confidently within the mobile ecosystem.As a profitable and rapidly growing business, we project revenues exceeding US$200 million in 2025, with profits surpassing US$25 million. Our strong cash flow allows us to invest continuously in our infrastructure, platform innovations, and global expansion initiatives. Our recent successes have marked a pivotal phase in our journey, with significant client acquisitions propelling us into a global mobile connectivity powerhouse.Founded in 2022 by seasoned tech entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is quickly emerging as a European technology leader, committed to shaping the future of global telecommunications. As a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and a regulated telecom operator in another 28, we are headquartered in the Netherlands with R&D hubs in Lisbon, Berlin, and São Paulo. Our dedicated team of nearly 500 experts across 15 countries is driven by a singular ambition: to enhance global mobile connectivity through innovative technology and operational excellence.About the RoleDesign and develop impactful features while contributing to the architectural framework with a focus on resilience, scalability, security, and fault tolerance.Champion high code quality and best practices to maintain robust software development.Work collaboratively in an agile team environment to ensure timely product delivery and management.

Mar 9, 2026

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Senior Backend Engineer at Future of Hotel Bookings | Berlin

Future of Hotel Bookings

Full-time|€110K/yr - €170K/yr|On-site|Berlin

Your ResponsibilitiesTake ownership of backend systems that facilitate thousands of hotel bookings daily.Design, develop, and maintain our core booking infrastructure, ensuring robust integrations with PMS platforms, channel managers, and payment processors.Define and support a resilient API layer that drives our React frontend applications.Enhance engineering standards by demonstrating exceptional system design, effective communication, and technical leadership.Collaborate closely with the founders to influence the long-term architecture and cultivate a strong engineering culture.

Apr 1, 2026

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Senior Backend Engineer (Rust) at Affinidi | Berlin

Affinidi

Full-time|On-site|Berlin, Germany

About the CompanyAffinidi is a pioneering technology firm committed to revolutionizing data ownership. We empower both businesses and individuals to take control of their data, offering a holistic approach to managing their digital identities while prioritizing privacy and security.Our innovative technology facilitates decentralized digital identity solutions, ensuring that everyone has the right to own and manage their data. We are dedicated to building a trusted ecosystem for digital credentials that enables secure data and service exchanges across various sectors and borders.About the Role:We are looking for a Senior Backend Engineer (Rust) who is solution-oriented and possesses proven experience in backend development using Rust. You will be responsible for designing, implementing, and maintaining robust backend systems that align with our vision of secure, decentralized data management.

Apr 2, 2026

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Senior Backend Engineer (m/f/d) at bunch | Berlin

bunch

Full-time|On-site|Berlin

Join our innovative team at bunch as a Senior Backend Engineer where you will play a pivotal role in shaping the future of our backend systems. You will collaborate with cross-functional teams to design, develop, and maintain robust, scalable backend solutions. Your expertise will be essential in ensuring the performance, quality, and responsiveness of our applications.

Feb 24, 2026

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Tax Consultant Assistant (m/f/d) - Innovative Startup

taxforce

Full-time|On-site|Berlin

Tax Consultant Assistant (m/f/d) – Innovative StartupAnnual Financial Statements, Tax Returns & Digital Process DevelopmentAt taxforce, we are pioneering a modern, AI-driven tax consulting firm. We blend traditional tax quality with cutting-edge digital processes, consciously building our firm without outdated structures.To further expand our operations, we are seeking a Tax Consultant Assistant who is eager to grow professionally while actively participating in the design of modern consulting processes.Your ResponsibilitiesPreparation and drafting of annual financial statementsCreation of corporate and personal tax returnsAddressing tax-related inquiries and special topicsCollaboration with the responsible tax consultantSupport in tax planning and strategy considerationsAct as a point of contact for clients regarding technical questionsProfessional Foundation & Process Understanding:Close collaboration with accounting to ensure accurate financial statementsReviewing and verifying accounting work in relation to financial statementsRole Objective: Professional Growth & Shaping Modern Consulting ProcessesIn addition to traditional tax duties, you will gradually develop towards taking on independent professional responsibilities with us. Simultaneously, we are continuously improving our processes:Analyzing and enhancing existing workflowsIdentifying potential for automationCollaborating with us to further develop AI-driven systemsEstablishing clear, scalable standardsWith your expertise, we aim to continuously improve our work methods to sustainably enhance quality, efficiency, and client care.

May 1, 2026

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Senior Backend Engineer (Rust) at Affinidi | Berlin

Affinidi

Full-time|On-site|Berlin, Germany

Affinidi develops technology that helps individuals and organizations manage their data with greater control. The company specializes in privacy and security, delivering decentralized digital identity solutions. Its platform enables secure data exchange and digital credential management across various industries and international boundaries. Role overview The Senior Backend Engineer (Rust) will take part in designing and building backend systems that support Affinidi’s digital identity products. This position centers on applying strong Rust expertise to real-world engineering problems, always with a practical mindset. Requirements Extensive experience developing backend systems with Rust Ability to address engineering challenges with practical, effective solutions

Apr 28, 2026

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Ruby Backend Developer - Remote

Blackbird Collective

Full-time|Remote|Berlin

Join our dynamic team at Blackbird Collective, where we partner with innovative startups seeking talented Backend Engineers to enhance their existing teams. Our reputation for delivering quality talent through referrals speaks volumes about our clients—each one an exceptional employer, offering thrilling projects within international teams.

Apr 8, 2021

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Senior Java Engineer (m/f/d) at redcare-pharmacy | Berlin

redcare-pharmacy

Full-time|On-site|Berlin

Join our innovative team at redcare-pharmacy as a Senior Java Engineer. In this pivotal role, you will leverage your expertise in Java programming to develop robust, scalable applications that enhance our digital pharmacy solutions. Collaborate with cross-functional teams to drive the design and implementation of high-quality software solutions.We are looking for a proactive and detail-oriented engineer who thrives in a dynamic environment and is passionate about problem-solving. If you are ready to make a significant impact in the healthcare technology space, we want to hear from you!

Apr 13, 2026

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Senior Backend Software Engineer - Join Cresta in Berlin

Cresta

Full-time|Hybrid|Berlin, Germany (Hybrid)

Cresta is dedicated to transforming every customer interaction into a strategic advantage by harnessing the full potential of contact centers. Our innovative platform merges cutting-edge AI with human expertise, enabling contact centers to uncover valuable customer insights, streamline conversations and processes, and empower team members to operate more efficiently. Founded by Sebastian Thrun, a visionary from the Stanford AI lab and the mastermind behind Google X, Waymo, and Udacity, our leadership team includes CEO Ping Wu, co-founder of Google Contact Center AI, alongside Tim Shi, an early member of OpenAI. We have gathered a stellar team of AI and machine learning specialists, market leaders, and esteemed investors such as Andreessen Horowitz, Greylock Partners, and Sequoia, along with former AT&T CEO John Donovan. Our esteemed clientele features renowned brands like Intuit, Cox Communications, Hilton, and Carmax, and we have been honored by Forbes and Bain Consulting as one of the premier private AI companies globally. Embark on an exhilarating journey with us as we revolutionize the contact center workforce through AI. The future of work is here, and it begins at Cresta!

Mar 2, 2026

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