Role Description The Senior Software Engineer (Java) will contribute to the design, development, and enhancement of enterprise‑grade software solutions. This role involves: - Researching emerging technologies - Building proof‑of‑concepts - Defining technical specifications - Delivering high‑quality code across the full development lifecycle The ideal candidate is a hands‑on engineer with strong Java expertise, a solid understanding of modern frameworks, and the ability to work effectively in a fast‑moving environment. Responsibilities include: - Improving system performance - Ensuring scalability - Supporting product releases - Resolving customer‑reported issues to maintain product stability Qualifications - Strong Java 8+ hands-on development experience - Experience with RESTful APIs and professional software engineering practices - Ability to work on complex engineering challenges and build proof-of-concept prototypes - Strong software design, architecture, debugging, and implementation capability - Data protection / security product experience is highly relevant Requirements - Research and evaluate emerging technologies to address complex engineering challenges - Develop proof-of-concept prototypes to validate proposed solutions - Collaborate with Product and Engineering Management to define functional specifications and design documents for NextLabs products and solutions - Lead definition, design, and development of products and components while following architectural best practices - Deliver architecture, technical solutions, and production-quality code across the SDLC - Improve system performance, scalability, and reliability of NextLabs products - Partner with QA and Technical Publications to support testing coverage and technical documentation - Collaborate across teams for cohesive system design and implementation Benefits - Competitive compensation - Health, dental, and vision insurance - Flexible paid time off - Remote‑friendly work environment - Professional development and technical growth opportunities - Collaborative engineering culture - Opportunity to work on high‑impact, enterprise‑level software initiatives

• Solve simple and complex programming tasks • Software engineering and commissioning of customer systems • Create the associated documentation

Role Description Koddi’s Ads team is building the next generation of performance advertising technology that powers some of the world’s largest brands in travel, retail, and e-commerce. We connect advertisers with consumers through precision targeting, automated optimization, and intelligent decisioning at massive scale. Our engineering teams build highly scalable systems that process billions of advertising events every day, enabling customers to make real-time decisions that drive measurable business outcomes. We're looking for a Senior Software Engineer to join our Supply-Side Platform (SSP) team. This role is ideal for an experienced backend engineer who enjoys solving difficult distributed systems problems, leading technical initiatives, collaborating across organizations, and growing toward engineering management. As a Senior Software Engineer on the SSP team, you will own the design, implementation, and long-term operation of critical platform capabilities that power large-scale advertising marketplaces. You will: - Lead complex technical initiatives from concept through production with minimal oversight. - Drive projects that span multiple engineers, coordinating technical execution while partnering closely with Product Managers, Program Managers, Data Scientists, and other engineering teams. - Design and build highly available, low-latency distributed systems capable of processing billions of ad requests, bids, impressions, clicks, and conversions. - Optimize backend services for throughput, latency, scalability, reliability, and operational excellence. - Develop integrations with external advertising platforms, DSPs, publishers, exchanges, and strategic technology partners. - Represent Engineering during technical discussions with customers and partners, including solution design, integration planning, technical kickoffs, troubleshooting, and occasional Quarterly Business Reviews. - Mentor engineers through design reviews, architecture discussions, code reviews, and day-to-day technical guidance. - Help establish engineering best practices across architecture, testing, observability, performance, and operational excellence. - Operate comfortably in ambiguous problem spaces, helping define technical solutions before requirements are fully formed. - Participate in on-call rotations and continuously improve system reliability and observability. Qualifications - 6+ years of professional software engineering experience building large-scale backend systems. - Strong experience building high-performance distributed systems. - Strong understanding of concurrency, asynchronous programming, networking, caching, and scalable system design. - Professional experience developing production services in Go (or demonstrated ability to quickly become productive in Go). - Experience building and operating cloud-native services. - Experience with messaging or streaming technologies such as Kafka, Pulsar, or similar platforms. - Strong SQL and data modeling skills. - Experience designing resilient APIs and integrating with external systems. - Excellent debugging and performance optimization skills. - Demonstrated ability to independently lead projects from planning through delivery. - Strong communication skills with both technical and non-technical audiences. - Experience with one or more of the following: - Advertising technology (SSP, DSP, Ad Exchange, RTB, programmatic advertising, retail media, or performance marketing) - OpenRTB or similar advertising protocols - Auction systems, bidding platforms, pacing, campaign delivery, or ad serving - Event-driven architectures - Kubernetes and container orchestration - Redis, Aerospike, or other high-performance data stores - AWS, Azure, GCP, or other public cloud platforms - CI/CD automation and infrastructure as code Technical Leadership Expectations This is more than an individual contributor role. Successful candidates will be expected to: - Lead technical execution across projects involving one or more engineers. - Break down ambiguous initiatives into executable plans. - Make sound technical decisions independently while appropriately communicating risks and tradeoffs. - Build strong working relationships across Engineering, Product, Program Management, Customer Success, Partnerships, and external customers. - Influence technical direction through architecture discussions and engineering best practices. Growth Opportunities As the SSP organization grows, this role is expected to evolve into a formal engineering leadership opportunity. We're especially interested in candidates who enjoy mentoring other engineers, leading technical initiatives, and are excited about growing into Engineering Management over time. Nice to Have - Supply-side advertising platforms - Demand-side platforms - Publisher technologies - Identity and attribution systems - Header bidding - Real-time bidding infrastructure - Large-scale distributed databases - AI-assisted software development workflows that improve engineering productivity or software quality

• Design and implement core chat and real-time features for a production healthtech product. • Collaborate closely with a small, cross-functional founding team to define and execute technical direction. • Build reliable, scalable services and iterate quickly based on real user feedback. • Participate in architecture and design discussions, balancing speed-to-ship with long-term maintainability. • Own components end-to-end — from implementation and testing through to monitoring and observability.